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IS REGIONAL ANESTHESIA APPROPRIATE FOR AMBULATORY SURGERY?
Erwin Kresnoadi, M.D, M.Med.Sc
Department Of Anesthesiology and Reanimation
University of Mataram / West Nusa Tenggara General Hospital
==================================================================
There is continuing debate about whether Regional anaesthesia (RA) or General anaesthesia
(GA) is better for ambulatory surgery. The answer is not straightforward. To implement a successful
RA ambulatory program, it is essential to have a teamwork approach between anaesthetist, surgeon
and ambulatory nurses, conducive to the practice of RA. With this teamwork approach RA can be
very appropriate for ambulatory surgery.
RA whether used alone or in combination with GA offers significant advantages to the
patient. RA provides selective analgesia to the surgical site reducing systemic analgesic requirements
and minimising opioid related side effects such as dizziness and nausea and vomiting. As a
consequence the recovery process can be facilitated, enabling earlier ambulation and discharge home.
RA alone is not appropriate for all ambulatory surgery; therefore careful patient, procedure and
surgeon selection is of key importance.
Practical Implementation of Regional Anaesthetic techniques
To streamline RA there are specific strategies an ambulatory team may pursue. The block
should be performed in a dedicated block room or recovery room with monitoring and oxygen
facilities and adequate time allowed for block onset. Intravenous sedation techniques are useful at
block insertion so that amnesia and anxiolysis can be achieved, however prolonged effects of sedative
agents can potentially delay discharge. Patients can be discharged from ambulatory surgery with
padding and protection of the insensate limb, provided both written and verbal discharge instructions
are given.
Peripheral Nerve Blockade
Upper limb surgery is most suited to peripheral nerve blockade (PNB). For short procedures
(eg carpal tunnel release) intravenous regional anaesthesia provides excellent surgical conditions with
quick recovery of neurologic function. Longer upper extremity procedures (eg rotator cuff repair)
associated with significant postoperative pain is best performed using brachial plexus anaesthesia.
The site of surgery will dictate which approach the clinician should take to the brachial plexus.
Interscalene block, acting at the roots of the brachial plexus, gives a reliable block for shoulder
surgery and provides adequate pain control for early rehabilitation. Infraclavicular block and the more
peripheral axillary approach to the brachial plexus are suitable for elbow and hand surgery
1
respectively. Compared to the traditional paraesthesia technique, nerve stimulation using insulated
needles is now used widely for PNB.
Lower extremity blocks are often under-utilised in ambulatory surgery. Femoral nerve block
provides excellent analgesia for knee surgery and varicose vein stripping, significantly improving
patient satisfaction. Blockade of the sciatic and femoral nerves more distally at the popliteal level,
predominantly used for foot and ankle surgery, has a high success rate with good postoperative pain
relief for up to 24 hours. Ankle block is a simple, safe technique for mid and forefoot surgery.
Addition of adjuvants such as clonidine to long acting local anaesthetics (LA) will prolong
postoperative analgesia produced by PNB.
Whilst its use today has been confined to a clique of adventurous anaesthesiologists,
paravertebral blocks are likely to become the technique of choice for many procedures that are
currently performed under GA. It provides excellent prolonged analgesia (24 hours) following breast
surgery, inguinal, ventral, and umbilical hernia repair. Good anatomical knowledge and appropriate
technique will result in high success rates and minimal complications.1 Neuraxial Blockade
Epidural anaesthesia is time consuming to perform, and is slower in onset than spinal anaesthesia.
However it may be appropriate when surgical procedures have an unpredictable time course with its
flexibility of additional LA dosing through a catheter (eg cruciate ligament repair or bilateral varicose
vein surgery).
Spinal anaesthesia with its high reliability and fast onset of action is a simpler option to
epidural anaesthesia. The risk of spinal headache has been minimised (1%) with the use of fine gauge,
pencil-point needles. Using short acting LA drugs with lipophilic opioid (fentanyl), the frequency of
urinary retention is acceptably low. Fentanyl appears to increase duration and quality of spinal block
without increasing discharge time.2 There is a balance between rapid offset of effect with small LA
doses and higher doses of LA which guarantee adequate block height but may result in unacceptable
block duration and side effects such a urinary retention. Lignocaine has the optimal onset and duration
for ambulatory surgery but concern over transient neurological symptoms (pain or sensory
abnormalities in the lower back, buttocks or lower extremities) in up to 20% patients, limit its use.
Low dose bupivacaine (5 –10 mg) with 10-25 mcg fentanyl provides excellent anaesthesia with
acceptable discharge times following knee arthroscopy with minimal risk of transient neurologic
syndrome. More recently there have been significant advances in the practice of selective spinal
anaesthesia where the distribution of spinal block is restricted to the operative side. Potential benefits
include fewer cardiovascular side effects, less urinary retention, good patient acceptance and earlier
patient discharge compared to bilateral distribution of spinal anaesthesia; this makes selective spinal
techniques suitable to ambulatory surgery.3
Mulroy has recently questioned the practice of voiding before discharge in spinal patients
undergoing ambulatory surgery. In a study of 201 patients Mulroy concluded that in healthy patients
of less than 70 years of age with no history of voiding problems who are not undergoing surgery in
2
the perianal or perineal region, or hernia repair, may be discharged safely 2 hours after 6 mg
intrathecal bupivacaine even if they have not voided.4 However, further large studies should be
performed before these guidelines should be adopted in common ambulatory practice.
Post-operative Analgesia.
Prior to a central neuraxial block wearing off, alternative analgesic options should be
introduced such as wound infiltration or PNB to optimise patient’s pain relief. Multimodal analgesic
regimes should be commenced at the time of surgery combining LA with non-steroidal anti-
inflammatory drugs and simple oral analgesics. A documented pain management plan will assist the
patient manage rebound pain at home when LA wears off. More recently the use of continuous
infusion catheters has enabled more painful procedures such as major orthopaedic, plastic or vascular
surgery to be performed on a day basis.5 Catheters can be placed either perineurally or into the wound.
Portable disposable non-electronic pumps preloaded with low concentration local anaesthetic (eg
ropivacaine 0.2%) and preset hourly infusion rates allows practical patient administration at home for
procedures such as major shoulder or knee surgery. Combining a basal infusion rate of LA with a
patient controlled bolus may provide best pain relief with good patient satisfaction. 6 Patients can
remove the catheters themselves however a home nursing service is desirable.
Further clinical studies are required to identify the most cost-effective anaesthetic technique
for ambulatory surgery. PNB in particular offers significant advantages over central neuraxial
blockade, and should be a key area for anaesthetists’ further education. There is also great enthusiasm
for catheter techniques, but limiting factors are appropriate training, and technical difficulties
associated with catheters and pump technology.
References
1. Klein SM, Bergh A, Steele SM et al. Thoracic paravertebral block for breast surgery. Anesth Analg 2000; 90: 1402-5.2. Ben-David B, Maryanovsky M, Gurevitch A et al. a comparison of mini-dose lidocaine-fentanyl and conventional-dose lidocaine
spinal anaesthesia. Anesth Analg 2000; 91:865-8703. Fanelli G, Borghi B, Casati A, Bertini L, Montebugnoli M, Torri G. Unilateral bupivacaine spinal anesthesia for outpatient knee
arthroscopy. Can J Anesth 2000;47: 746-751. 4. Mulroy MF, Salinas FV, Larkin KL, Polissar NL. Ambulatory surgery patients may be discharged before voiding after short-
acting spinal and epidural anesthesia. Anesthesiology 2002;Aug;97(2):315-319.5. Rawal N, Axelsson K, Hylander J, etal. Postoperative patient-controlled local anaesthetic administration at home. Anesth Analg
1998;86:86-9.6. Borgeat A, Kalberer F, Jacob H et al. Patient-controlled interscalene analgesia with ropivacaine 0.2% versus bupivacaine 0.15%
after major open shoulder surgery: the effects on hand motor function. Anesth Analg 2001; 92:218-223.
3
MONITORED ANESTHESIA CARE AND REGIONAL ANESTHESIA FOR
AMBULATORY SURGERY
Erwin Kresnoadi, M.D, M.Med.Sc
Department Of Anesthesiology and Reanimation
University of Mataram / West Nusa Tenggara General Hospital
==================================================================Use of local anesthetic infiltration and peripheral nerve blocks in combination with
intravenous analgesic and sedative drugs is gaining popularity in the ambulatory setting. It has been
estimated that over 50% of all outpatient (day-surgery) procedures could be performed utilizing these
techniques. When patients are undergoing procedures under local anesthesia with sedation in the
operating room (OR), the old terminology used to describe the care of these patients was “conscious
sedation”.1 As the term implies, conscious sedation was a minimally-depressed level of consciousness
that retained the patient’s ability to maintain an airway independently and continuously, and to
respond appropriately to physical stimulation and verbal commands. The ASA avoids this term in
their Practice Guidelines of Sedation and Analgesia by Non-anesthesiologists because it is imprecise. 2
The preferred terminology is therefore monitored anesthesia care (MAC).
Monitored anesthesia care
MAC is the term used when an anesthesiologist monitors a patient receiving local anesthesia
alone or administers anesthetic drugs to patients undergoing diagnostic or therapeutic procedures with
or without local anesthesia.3 The ASA defines MAC as instances in which an anesthesiologist has
been called on to provide specific anesthesia services to a particular patient undergoing a planned
procedure, in connection with which a patient receives local anesthesia or, in some cases, no
anesthesia at all. In such a case, the anesthesiologist is providing specific services to the patient, is in
control of his or her vital signs, and is available to administer anesthetics or provide other medical
care as appropriate.4 The standard of care of patients receiving monitored anesthesia care should be
the same as for patients undergoing general or regional anesthesia and should include a complete
preoperative assessment, intraoperative monitoring, and postoperative recovery. Vigilant monitoring
is required because patients may rapidly progress from a “light” level of sedation to “deep” sedation
(or unconsciousness), and thus may be at risk for airway obstruction, oxygen desaturation, and even
aspiration.
Anesthetic drugs are commonly administered during procedures under MAC to produce
analgesia, sedation, and anxiolysis, while providing for a rapid recovery without side effects.
Systemic analgesics are used to reduce discomfort associated with injection of local anesthetics and
prolonged immobilization, as well as pain which is not amendable to local anesthetics (e.g.,
endoscopy).5 Sedative drugs are used to make procedures more tolerable for patients by reducing
4
anxiety and by providing a degree of intraoperative amnesia and allowing to rest. During longer
surgical procedures, patients may become restless, bored, or uncomfortable when forced to remain
immobile, therefore sedative-hypnotic drugs may prove beneficial because they allow patients to rest.6
Patients’ anxiety can be reduced by using benzodiazepines, as well as by good preoperative
communication, keeping the patient warm and covered, and allowing the patient to listen to music
during the procedure.7
Many different sedative-hypnotic drugs have been used during MAC (including barbiturates,
benzodiazepines, ketamine, propofol and alpha-2 agonists). In addition, a wide variety of delivery
systems such as intermittent boluses, variable-rate infusions, target-controlled infusions, as well as
patient-controlled analgesia and/or sedation have been utilized during these procedures. 8 The most
commonly used sedative drugs are midazolam (1-2 mg) and propofol (0.5-1 mg/kg followed by
infusion at 25-100 µg/kg/min). Methohexital has also been used successfully during MAC by
intermittent boluses (10–20 mg) or as a variable-rate infusion (0.1–0.2% solution). 9 Although residual
sedation appears to be greater with methohexital than with propofol, one study found no statistical
difference in the recovery times when comparing infusions of methohexital (40 µg/kg/min) and
propofol (50 µg/kg/min) during a MAC technique. However, there was a higher incidence of pain on
injection in the propofol infusion group.10-12 Therefore, methohexital may be a cost-effective
alternative to propofol for sedation during MAC. Careful titration of the IV anesthetic is essential to
achieve the desired level of sedation and to ensure prompt recovery.3
In women undergoing laparoscopic tubal sterilization with a MAC technique the anesthetic
drug costs were significantly reduced compared to general anesthesia ($21 vs $46, respectively). The
MAC technique was also associated with less time in the OR (304 vs 341 min), a higher degree
of “awakeness” on the evening of the day of surgery (4.31.4 vs 3.61.4), as well as decreased
postoperative pain (33% vs 80%) and sore throats (3% vs 70%), contributing to a significant
reduction in perioperative costs.13 Patel et al14 reported that the use of MAC sedation resulted in a 6- to
7-minute decrease in the OR exit time compared to general anesthesia with desflurane, contributing to
enhanced turnover of cases. This is an important consideration in today’s practice environment with
the heavy emphasis on “fast-tracking” processes.
Avramov et al15 described the combined use of alfentanil (0.3–0.4 µg/kg/min) and propofol
(25, 50, or 75 µg/kg/min) infusions for MAC. Concomitant use of propofol significantly reduced the
opioid dose requirement (30–50%) and the incidence of postoperative nausea and vomiting (0–17%
vs 33%) when compared with alfentanil infusion alone. An infusion of remifentanil, 0.05 to 0.15
µg/kg/min, can provide adequate sedation and analgesia during minor surgical procedures performed
with the patient under local anesthesia when administered in combination with midazolam, 2 to 4 mg.
Sá Rêgo et al16 compared the use of intermittent remifentanil boluses (25 µg) vs a continuous
variable-rate infusion (0.025–0.15 µg/kg/min) when administered to patients undergoing ESWL under
a MAC technique involving midazolam (2 mg) and propofol (25–50 µg/kg/min). Patients comfort was
5
higher during the procedure when remifentanil was administered by a variable-rate infusion.
However, these patients also experienced a higher incidence of desaturation (30% vs 0%) compared
with those receiving small intermittent boluses of remifentanil. In a direct comparison of remifentanil
and propofol administered by continuous infusion after premedication with midazolam, there was a
decreased level of sedation and a greater degree of respiratory depression with remifentanil (versus
propofol) administration. Therefore, remifentanil infusions must be carefully titrated to avoid
excessive respiratory depression.17 The use of remifentanil in combination with local anesthetics
obviates the disadvantages of the minimal residual analgesia when remifentanil is used during painful
procedures.
Given the increased risk of ventilatory depression when opioid analgesics are combined with
sedative-hypnotics, a variety of non-opioid analgesics have been evaluated during MAC. Ketorolac, a
potent, parenterally-active NSAID has been used both as a sole supplement and as an adjunct to
propofol sedation during local anesthesia. Use of ketorolac is associated with a lower incidence of
pruritus, nausea, and vomiting than fentanyl. However, when used with propofol sedation, ketorolac-
treated patients required higher intraoperative doses of propofol and more supplemental opioid
analgesia compared with the use of fentanyl. Low-dose ketamine (0.25–0.75 mg/kg) combined with
either midazolam or propofol has also been administered before injection of local anesthetics in
outpatients undergoing cosmetic surgical procedures.18 Ketamine has the advantage over opioid
analgesics of producing less ventilatory depression and PONV while providing better intraoperative
analgesia than the NSAIDs. Both midazolam and propofol can attenuate.
Subanesthetic concentrations of inhaled anesthetics (e.g., N2O, 30–50% in oxygen or
sevoflurane 0.3-0.6%) can also be used to supplement local anesthesia.19 The primary concerns relate
to the ease which the patient can drift into an unconscious state, as well as operating room pollution.
The α2-agonists reduce central sympathetic outflow and have been shown to produce
anxiolysis and sedation.20 Kumar et al21 demonstrated that oral clonidine (300 µg) provided effective
anxiolysis for elderly patients undergoing ophthalmic surgery under local anesthesia and also
decreased the incidence of intraoperative hypertension and tachycardia. Dexmedetomidine, a more
selective and potent α2-agonist, significantly decreased anxiety levels and reduced the requirements
for supplemental analgesic medications when given before IV regional anesthesia for hand surgery.22
When comparing dexmedetomidine with midazolam for sedation, Aho et al23 described a faster
recovery from sedation when dexmedetomidine was followed by reversal with the specific α2-
antagonist atipamezole. However, the administration of dexmedetomidine has been associated with
bradycardia, which may limit its usefulness during MAC.22,24
Regional anesthesia
Regional anesthesia can offer many advantages for the ambulatory patient population. In
addition to limiting the anesthetized area to the surgical site, common side effects of general
6
anesthesia (e.g., nausea, vomiting, dizziness, lethargy) can be avoided.25 Furthermore, the need for
postanesthesia nursing care is decreased if effective analgesia is provided in the early postoperative
period.26,27 It has been suggested that regional anesthesia is cost- in the outpatient setting because of
the lower incidence of side effects and improved recovery compared with general anesthesia.28 Proper
patient selection along with the skill and enthusiasm of the surgical and anesthesia teams will allow an
even wider variety of procedures to be performed using regional anesthetic techniques in the future.
For short superficial surgical procedures (<60 min) limited to a single extremity, the
intravenous regional (Bier) block with lidocaine, 0.5% , is a simple and reliable technique. This
procedure, which can be used for either upper or lower extremity surgery, uses a double tourniquet to
decrease tourniquet pain. Intravenous regional anesthesia has been reported to be the most cost-
effective technique for outpatient hand surgery.29
If more profound and prolonged anesthesia of the upper extremity and shoulder is required, a
regional block of the brachial plexus can be used (e.g., axillary, supraclavicular or interscalene
block).30 Peripheral nerve blocks are also useful for surgery on the leg. The “three-in-one block”
(femoral, obturator, and lateral femoral cutaneous nerves) using a perivascular technique is useful for
outpatient knee arthroscopy and anterior cruciate ligament repairs, providing excellent postoperative
analgesia with a high degree of patient acceptance. Ankle blocks are also simple and effective
techniques for surgery on the foot. Popliteal sciatic nerve blocks have been shown to provide
excellent postoperative analgesia after foot and ankle surgery.31
In pediatric patients, peripheral nerve blocks can be performed immediately after induction of
general anesthesia to reduce the anesthetic requirement and provide postoperative analgesia.32
Historically, caudal anesthesia has been the most popular technique to reduce postoperative pain in
children undergoing lower abdominal, perineal, and lower extremity procedures. Other popular
regional anesthetic techniques include blockade of the ilioinguinal and iliohypogastric nerves to
minimize post-herniorrhaphy pain and the use of dorsal penial nerve block and subcutaneous ring
block postcircumcision pain.33 Interestingly, simple wound infiltration (or instillation) with local
anesthetics may be as effective as a caudal or ilioinguinal nerve block in reducing pain after inguinal
hernia repair.34 Studies also suggest that systemic ketorolac (1 mg/kg) is as efficacious as caudal
blockade, with a lower incidence of side effects.35 Similarly, topical lidocaine ointment is an effective
alternative to both a nerve block and opioid analgesics for postcircumcision pain.
Summary
MAC is the anesthetic technique of choice for providing cost-effective anesthetic care in the
ambulatory setting. Peripheral nerve blocks as part of a MAC sedation technique can further enhance
the efficacy of this technique. The most important factors in achieving the desired clinical outcome
are effective local analgesia and the careful titration of systemic sedative and analgesic medications.
7
References
1. Smith I, White PF: Monitored anesthesia care: How much sedation, how much analgesia? J Clin Anesth 8:76S, 1996.
2. Cruise CJ, Chung F, Yogendran S et al: Music increases satisfaction in elderly outpatients undergoing cataract surgery. Can J Anaesth 44:43, 1997.
3. Newson C, Joshi GP, Victory R et al: Comparison of propofol administration techniques for sedation during monitored anesthesia care. Anesth Analg 81:486, 1995.
4. American Society of Anesthesiologists: Position on Monitored Anesthesia Care. Directory of Members. Park Ridge, Illinois, American Society of Anesthesiologists, 1997, p 413.
5. Ghouri AF, Taylor E, White PF: Patient-controlled drug administration during local anesthesia: a comparison of midazolam, propofol and alfentanil. J Clin Anesth 4: 476-9, 1992.
6. White PF, Negus JB: Sedative infusions during local and regional anesthesia: A comparison of midazolam and propofol. J Clin Anesth 3:32, 1991.
7. Pratila MG, Fischer ME, Alagesan R et al: Propofol vs midazolam for monitored sedation: A comparison of intraoperative and recovery parameters. J Clin Anesth 5:268, 1993.
8. Taylor E, Ghouri AF, White PF: Midazolam in combination with propofol for sedation during local anesthesia. J Clin Anesth 4:213, 1992.
9. Sá Rêgo MM, Inagaki Y, White PF: The cost-effectiveness of methohexital versus propofol for sedation during monitored anesthesia care. Anesth Analg 88: 723-8, 1999.
10. Cohen MM, Duncan PG, DeBoer DP et al: The postoperative interview: Assessing risk factors for nausea and vomiting. Anesth Analg 78:7, 1994.
11. Honkavaara P, Lehtinen AM, Hovorka J et al: Nausea and vomiting after gynaecological laparoscopy depends upon the phase of the menstrual cycle. Can J Anaesth 38:876, 1991.
12. Beattie WS, Lindblad T, Buckley DN et al: The incidence of postoperative nausea and vomiting in women undergoing laparoscopy is influenced by the day of menstrual cycle. Can J Anaesth 38:298, 1991.
13. Bordahl PE, Raeder JC, Nordentoft J et al: Laparoscopic sterilization under local or general anesthesia? A randomized study. Obstet Gynecol 81:137, 1993.
14. Smith CE, Pinchak AC et al: Desflurane is not associated with faster operating room exit times in outpatients. J Clin Anesth 8:130, 1996.
15. Avramov MN, White PF. Use of alfentanil and propofol for outpatient monitored anesthesia care: determining the optimal dosing regimen. Anesth Analg 85:566, 1997.
16. Sa Rego MM, Watcha MF, White PF: The changing role of monitored anesthesia care in the ambulatory setting. Anesth Analg 85:1020, 1997.
17. Waters RM: The downtown anesthesia clinic. Am J Surg 33:71, 1919.
18. Korttila K, Ostman P, Faure E et al: Randomized comparison of recovery after propofol-nitrous oxide vs thiopentone-isoflurane-nitrous oxide anaesthesia in patients undergoing ambulatory surgery. Acta Anaesthesiol Scand 34:400, 1990.
19. Gold BS, Kitz DS, Lecky JH et al: Unanticipated admission to the hospital following ambulatory surgery. JAMA 262:3008, 1989.
20. Issioui T, Klein KW, White PF, et al. Cost-efficacy of rofecoxib vs acetaminophen for preventing pain after ambulatory surgery. Anesthesiology 97: 931, 2002.
21. Kumar A, Bose S, Bhattacharya A et al: Oral clonidine premedication for elderly patients undergoing intraocular surgery. Acta Anaesthesiol Scand 36:159, 1992.
22. McKenzie R, Uy NT, Riley TJ et al: Droperidol/ondansetron combination controls nausea and vomiting after tubal banding. Anesth Analg 83:1218, 1996.
23. Doze VA, Shafer A, White PF: Nausea and vomiting after outpatient anesthesia: Effectiveness of droperidol alone and in combination with metoclopramide. Anesth Analg 66:S41, 1987.
24. Tang J, Watcha MF, White PF: A comparison of costs and efficacy of ondansetron and droperidol as prophylactic antiemetic therapy for elective outpatient gynecologic procedures. Anesth Analg 83:304, 1996.
25. Philip BK: Regional anaesthesia for ambulatory surgery. Can J Anaesth 39:R3, 1992.
26. Mingus ML: Recovery advantages of regional anesthesia compared with general anesthesia: Adult patients. J Clin Anesth 7:628, 1995.
27. Bridenbaugh LD: Regional anaesthesia for outpatient surgery: A summary of 12 years’ experience. Can Anaesth Soc J 30:548, 1983.
28. Greenberg CP: Practical, cost-effective regional anesthesia for ambulatory surgery. J Clin Anesth 7:614, 1995.
29. Chan VW, Peng PW, Kaszas Z, et al. A comparative study of general anesthesia, intravenous regional anesthesia and axillary block for outpatient hand surgery: Clinical outcome and cost analysis. Anesth Analg 93:1181, 2001.
30. D’Alessio JG, Rosenblum M, Shea KP et al: A retrospective comparison of interscalene block and general anesthesia for ambulatory surgery shoulder arthroscopy. Reg Anesth 20:62, 1995.
31. Singelyn FJ, Aye F, Gouverneur JM: Continuous popliteal sciatic nerve block: An original technique to provide postoperative analgesia after foot surgery. Anesth Analg 84:383, 1997.
32. Pflug AE, Aasheim GM, Foster C: Sequence of return of neurological function and criteria for safe ambulation following subarachnoid block (spinal anaesthetic). Can Anaesth Soc J 25:133, 1978.
33. Vater M, Wandless J: Caudal or dorsal nerve block? A comparison of two local anaesthetic techniques for postoperative analgesia following day case circumcision. Acta Anaesthesiol Scand 29:175, 1985.
34. Reid MF, Harris R, Phillips PD et al: Day-case herniotomy in children: A comparison of ilio-inguinal nerve block and wound infiltration for postoperative analgesia. Anaesthesia 42:658, 1987.
35. Splinter WM, Reid CW, Roberts DJ, et al: Reducing pain after inguinal hernia repair in children: caudal anesthesia versus ketorolac tromethamine. Anesthesiology 87: 542, 1997.
8
AMBULATORY ANESTHESIA & SURGERY
Erwin Kresnoadi, M.D, M.Med.ScDepartment Of Anesthesiology and Reanimation
University of Mataram / West Nusa Tenggara General Hospital==================================================================Introduction
Ambulatory surgery accounts for over 60% of all elective operative procedures performed in
the United States. With the recent growth in major laparoscopic and office-based surgery, this
percentage may increase to 70% in the future. When surgery is performed outside the conventional
hospital environment, it can offer a number of advantages for patients, healthcare providers, third-
party payers, and even hospitals.1 Patients benefit from day surgery because it minimizes costs,
decreases separation from their home and family environment, reduces surgery waiting times,
decreases their likelihood of contracting hospital-acquired infections, and appears to reduce
postoperative complications. Compared to traditional hospital admissions, there is less pre- and
postoperative lab testing and also a reduced demand for postoperative pain medication following
ambulatory surgery. Unlike inpatient surgery, ambulatory surgery does not depend upon the
availability of a hospital bed and may permit the patient greater flexibility in selecting the time of
their elective operation. Furthermore, there is greater efficiency in the utilization of the operating and
recovery rooms in the ambulatory setting, contributing to a decrease in the overall patient charges
compared to similar hospital based care.
Comparison of general, spinal and local anesthesia
The optimal anesthetic technique in the ambulatory setting would provide for excellent
operating conditions, a rapid recovery, no postoperative side effects, and a high degree of patient
satisfaction. In addition to increasing the quality and decreasing the costs of the anesthetic services,
the ideal anesthetic technique would also improve operating room (OR) efficiency and provide for an
early discharge home without side effects. Local anesthesia with intravenous (IV) sedation (so-called
monitored anesthesia care [MAC]), spinal anesthesia, and general anesthesia are all commonly used
anesthetic techniques for ambulatory surgery. However, opinions differ as to the “best” anesthetic
technique for these surgical procedures.2-15 Rather than simply generalizing as to the best anesthetic
technique for ambulatory surgery, it is necessary to individually analyze each surgical procedure. For
example, in an Editorial in Anesthesia & Analgesia16, Kehlet and White discussed the optimal anesthetic
technique for inguinal hernia repair.
In the current cost-conscious environment, it is important to also examine the impact of
anesthetic techniques on OR turnover times, as well as the recovery process after ambulatory surgery
9
because prolonged recovery times and reduced efficiency and productivity contribute to increased cost of
surgical care.10 In addition, patient satisfaction with their perioperative experience and quality of recovery
is improved when the anesthetic technique chosen for the procedure is associated with a low incidence of
postoperative side effects [e.g., pain, dizziness, headaches, postoperative nausea and vomiting
(PONV)].10,11 For example, routine use of prophylactic antiemetic drugs during general anesthesia has
been found to increase patient satisfaction in “at risk” surgical populations.17 Furthermore, the use of local
anesthetic infiltration and peripheral nerve blocks decreases postoperative pain after ambulatory surgery
procedures irrespective of the anesthetic technique.4,18,19
The time required to achieve a state of home-readiness (“fitness” for discharge home) is
influenced by a wide variety of surgical and anesthetic factors.20,21 However the major contributors to
delays in discharge after ambulatory surgery are nausea, vomiting, dizziness, pain and prolonged
sympathetic and/or motor blockade. Although the incidence of PONV can be decreased by the use of
prophylactic antiemetic drugs,17 it remains a common side effect after general anesthesia and prolongs
discharge after ambulatory surgery.10,11 The primary factors delaying discharge after spinal anesthesia
are recovery from the residual motor blockade and sympatholytic effects of the subarachnoid block,
contributing to delayed ambulation and inability to void. These side effects can be minimized by the
use of so-called mini-dose lidocaine fentanyl spinal anesthetic techniques.13,15 Other common concerns
with spinal anesthesia include back pain, post-dural puncture headache and transient radicular
irritation with lidocaine.22,23 Although MAC is associated with the lowest incidence of postoperative
side effects,10,11 the possibility of transient nerve palsy is a concern when peripheral nerve block
techniques are used.25,26
The cost savings with the use of newer general anesthetic techniques are lost if institutional
practices mandate minimum lengths of stay in the Phase 1 unit [Postanesthesia care unit (PACU)] and
do not permit fast-tracking of patients who emerge rapidly from anesthetic directly to the Phase 2
[Day-surgery (“step-down”)] unit. Claims of reduced total costs with earlier discharge are commonly
based on the assumption that there is a linear relationship between the costs of a service and the time
spent providing it. However, since personnel costs are semi-fixed rather than variable, an additional
15-30 minute stay in the PACU may not be associated with increased costs to the institution unless
the facility is working at or near its capacity.27 In that situation, a longer stay is potentially associated
with a “bottleneck” in the flow of patients through the OR suites and recovery areas, requiring
overtime payments to the nurses and/or the hiring of additional perioperative personnel. There appears
to be a much closer relationship between lower costs and bypassing of the PACU (“fast-tracking”), as
the major factor in recovery care costs relates to the peak number of patients admitted to the PACU
unit at any time.27 Fast-tracking can lead to the use of fewer nurses and a mix of less highly trained,
lower wage nursing aides and fully-qualified recovery room nurses, and reduces “overtime” personnel
costs for busy ambulatory surgery units. Shorter anesthesia times, the ability to bypass the PACU
10
(Phase 1), and a decreased length of stay in the day-surgery (Phase 2) unit will reduce total
institutional costs.28 Studies have demonstrated that “fast-tracking” ambulatory surgery patients
decrease the times to actual discharge.29,30
The combination of low costs and high patient satisfaction suggests that the highest quality
(cost/outcome) anesthetic may be achievable with a MAC technique assuming that the surgical
procedure is amendable to this anesthetic approach (e.g., superficial surgical and endoscopic
procedures. Unfortunately, many pharmacoeconomic studies have limited cost considerations to only
the acquisition costs of the drugs and supplies rather than the total (direct + indirect) expenses
associated with a given anesthetic technique. The total cost should include both the acquisition costs
of drugs and the labor required for managing side effects (e.g., PONV, pain, drowsiness, bladder
dysfunction). Since personnel costs constitute a major proportion of expenses in the OR and recovery
areas, anesthetic techniques which require more time in the various phases of the perioperative
process will not surprisingly be more expensive.10,11
The availability of improved sedation and analgesia techniques to complement local
anesthetic infiltration has increased the popularity of performing surgery utilizing MAC techniques.31
The high patient satisfaction with local anesthesia/sedation is also related to effective control of
postoperative pain and the absence of side effects associated with the other commonly used general
and spinal anesthetic techniques. The success of MAC techniques is dependent not only on the
anesthesiologist, but also upon the skills of the surgeon in providing effective infiltration analgesia
and gentle handling of the tissues during the intraoperative period. Local anesthesia without any
monitoring or intravenous adjuvants (so-called “unmonitored” local anesthesia), has been successfully
used in situations where local anesthesia is able to provide excellent analgesia and patients do not
object to being awake and aware of events in the operating room.32 The importance of good surgical
skills is critically important because inadequate intraoperative control of pain can lead to prolonged
surgery times and patient dissatisfaction with their surgical experience. In a prospective, randomized
comparison of local infiltration with spinal and general anesthesia (33), surgeons in Sweden suggested
the technical difficulties and patient pain were “more intense” during surgery under local anesthesia.
This finding is consistent with an earlier report by Fairclough et al .34 However, with these surgical
provisions, it is widely accepted that superficial surgical procedures can be performed as safely and
effectively under local anesthesia as under any other form of anesthesia. In fact, the researchers in
Sweden concluded that “for most patients, local anesthesia can be recommended as the standard
procedure for outpatient knee arthroscopy”.33
While most studies have suggested that local anesthesia (e.g., local infiltration and/or
peripheral nerve blocks) are not only well-accepted by patients and surgeons for superficial outpatient
procedures (e.g., breast surgery, knee arthroscopy, anorectal surgery, and inguinal herniorrhaphy) but
is also more cost-effective than either spinal or general anesthesia,10,11,35 some studies have suggested
that spinal anesthesia is more cost- effective than general anesthesia.5,7 These and other studies have
11
suggested that the use of smaller dosages of lidocaine (15-30 mg) or bupivacaine (3-6 mg) combined
with a potent opioid (e.g., fentanyl, 12.5-25 g, or sufentanil, 5-10 µg) contributes to a faster recovery
of both motor and bladder function than conventional doses of the local anesthetic alone. Earlier
discharge after spinal anesthesia using the so-called mini-dose techniques will clearly improve its
cost-effectiveness in the ambulatory setting. Unfortunately, side effects such as pruritis and nausea are
increased even when small doses of fentanyl (or sufentanil) are administered into the subarachnoid
space.15
Even though central neuroaxial blocks can be made more cost-effective by using smaller
doses of short-acting local anesthetics combined with potent opioid analgesics, use of MAC
techniques for superficial (non-cavitary) ambulatory surgery procedures will result in the shortest
times to home readiness, lowest pain scores at discharge, and smallest incremental costs when
compared to both spinal and general anesthesia.10,11 Therefore, in situations where fast-tracking is
permitted, the use of MAC techniques would appear to offer significant advantages over both central
neuroaxis blocks (i.e., spinal/epidural) and general anesthetic techniques.
The availability of more rapid and shorter-acting intravenous and inhaled anesthetics,
analgesics and adjunctive drugs, as well as improved cerebral monitoring capabilities, has facilitated
the recovery process after general anesthesia. For example, studies involving the use of “light”
general anesthetic techniques with a laryngeal mask airway device and local analgesia have
demonstrated that outpatients undergoing superficial surgical procedures (e.g., hernia repair, breast
surgery) are able to ambulate within 30 min and can be discharged home in less than 60 min after
completion of their operation (36-38). When tracheal intubation is required [e.g., laparoscopic
procedures, risk factors for aspiration (e.g., diabetics, morbidly obese, esophageal dysfunction)], use
of minimal, effective doses of newer short-acting opioid analgesics (e.g., remifentanil) and
sympatholytic (e.g., esmolol) drugs can facilitate the early recovery process and allow patients to
achieve earlier discharge times after ambulatory surgery.39-42 The use of the more costly drugs can be
economically justified if improvements in recovery and work patterns can be demonstrated.43
However, anesthetic practices have advanced to the point where cost savings from variations in drug
use are only apparent when system-wide improvements are made in the efficacy of resource
utilization (including personnel, space, time, consumables and capital investments).44
Fast-tracking concepts
Ambulatory anesthesia is administered with the dual goals of rapidly and safely establishing
satisfactory conditions for the performance of therapeutic or diagnostic procedures while ensuring a
rapid, predictable recovery with minimal postoperative sequelae. If the careful titration of short-acting
drugs permits a safe transfer of patients directly from the operating room suite to the less labor-
intensive recovery area where the patient can be discharged home within one hour after surgery,
significant cost savings to the institution can be achieved.44 Bypassing the Phase I recovery (i.e.,
12
PACU) has been termed “fast-tracking” after ambulatory surgery.45 In addition, fast-tracking can also
be accomplished directly from the PACU by creating a specialized area where recovery procedures
are organized along the lines of a step-down unit.46 The criteria used to determine fast-track eligibility
has been made even more stringent than the standard PACU discharge criteria in order to reduce the
need for interventions in areas with less nursing personnel. The use of anesthetic techniques
associated with a more rapid recovery will result in fewer patients remaining deeply sedated in the
early postoperative period30,48, decrease the risk for airway obstruction and cardiorespiratory
instability, and reduce the number of nursing interventions.49 By reducing the need for “intensive”
nursing care in the early postoperative period using anesthetic techniques associated with a faster
emergence from anesthesia, a well-organized fast tracking program can permit an institution to use
fewer nurses in the recovery areas and leads to significant cost savings.50 The fast-track concept is
gaining wider acceptance throughout the world.51 Even elderly outpatients can be fast-tracked after
general anesthesia if short-acting drugs are utilized.49
Improved titration of anesthetic drugs using EEG-based cerebral monitors (e.g., bispectral
index [BIS], physical state index [PSI], auditory-evoked potential [AEP], and entropy) can lead to a
faster emergence from anesthesia and can be useful in predicting fast-track eligibility .54 Although the
early studies involving propofol and the newer volatile anesthetics sevoflurane and desflurane 53,
suggested that the anesthetic-sparing effect could facilitate a faster emergence from anesthesia, these
studies failed to demonstrate a decrease in the times to discharge home because standard recovery
practices were used. However, if outpatients are allowed to recover via a fast-track pathway, use of
cerebral monitoring can actually reduce discharge times.55
While the availability of more rapid and shorter-acting anesthetic drugs (e.g., propofol,
sevoflurane, desflurane, remifentanil) has clearly facilitated the early recovery process after general
anesthesia, the preemptive use of non-opioid analgesics (e.g., local anesthetics, ketamine,
nonsteroidal antiinflammatory drugs, COX-2 inhibitors, acetaminophen)56 and antiemetics (e.g.,
droperidol, metoclopramide, 5-HT3 antagonists, dexamethasone)57, will reduce postoperative side
effects and accelerate both the immediate and late recovery phases after ambulatory surgery.
Multimodal approaches to preventing postoperative complications
As more complex procedures are performed utilizing minimally-invasive surgical approaches
(e.g., laparoscopic adrenalectomy, arthroscopic knee and shoulder reconstructions), the ability to
effectively control postoperative side effects may make the difference between performing a given
procedure on an inpatient or ambulatory basis. For routine antiemetic prophylaxis, the most cost-
effective combination consists of low-dose droperidol (0.5-1 mg) and dexamethasone (4-8 mg).58
Interestingly, dexamethasone appears to facilitate an earlier discharge independent of its effects on
PONV.59,60 Outpatients at high risk of PONV will benefit from the addition of a 5-HT3 antagonist
(e.g., ondansetron, dolasetron, granisetron)61,62 or an acustimulation device (e.g., SeaBand,
13
ReliefBand).63,64 Droperidol remains the most cost-efffective antiemetic assuming side effects can be
avoided.65,66 Although controversy exists regarding its potential for cardiac arrhythmias, droperidol
has remained a safe and effective antiemetic for over 30 years.67 An aggressive multimodal approach
to minimize PONV can improve the recovery process and enhance patient satisfaction.68 In addition to
utilizing combination antiemetic therapy, simply insuring adequate hydration will minimize nausea
and other side effects (e.g., dizziness, drowsiness, thirst) during the postoperative period.69
A multimodal (or “balanced”) approach to providing postoperative analgesia is also essential
in the ambulatory setting.70-72 Not surprisingly, pain has been found to be a major factor complicating
recovery and delaying discharge after ambulatory surgery.73 The addition of low-dose ketamine (75-
150 g/kg) to a multimodal analgesic regimen improved postoperative analgesia and functional
outcome after painful orthopedic surgery procedures.74,75 Following outpatient surgery, pain must be
controllable with oral analgesics (e.g., acetaminophen, ibuprofen, acetaminophen with codeine) before
patients are discharged from the facility. Although the potent rapid-acting opioid analgesics (e.g.,
fentanyl, sufentanil) are commonly used to treat moderate-to-severe pain in the early recovery period,
these compounds increase the incidence of PONV and may contribute to a delayed discharge after
ambulatory surgery.56,73 As a result of the concerns regarding opioid-related side effects, there has
been an increased interest in the use of potent non-steroidal anti-inflammatory agents (e.g., diclofenac,
ketorolac), which can effectively reduce the requirements for opioid-containing oral analgesics after
ambulatory surgery, and can lead to an earlier discharge home.76 Other less expensive oral non-
steroidal analgesics (e.g., ibuprofen, naproxen)77,78 may be acceptable alternatives to fentanyl and the
parenteral non-selective NSAIDs if administered in a pre-emptive fashion. Recently, premedication
with the COX-2 inhibitors (e.g., celecoxib, rofecoxib, valdecoxib, parecoxib) has become more
popular because they are devoid of potential adverse effects on platelet function.79 For routine clinical
use, oral premedication with rofecoxib (50 mg), celecoxib (400 mg) or valdecoxib (40 mg) is a simple
and cost-effective approach to improving pain control and decreased discharge times after ambulatory
surgery.80-84 The injectable COX-2 inhibitor, parecoxib, may prove useful in the future.85,86 Finally,
acetaminophen is a very cost-effective alternative to the COX-2 inhibitors if it can be given in a high
enough dose (40-60 mg/kg po or pr) prior to the end of surgery.87,88
One of the keys to facilitating the recovery process is the routine use of local anesthetics as
part of a multimodal regimen.56 Use of local anesthetic techniques for intraoperative analgesia during
MAC, as well as adjuncts to general (and spinal) anesthesia, can provide excellent analgesia during
the early postoperative recovery and postdischarge periods.4,18,19 Even simple wound infiltration and
instillation techniques have been shown to improve postoperative analgesia following a variety of
lower abdominal, peripheral extremity and even laparoscopic procedures. A wide variety of peripheral
extremity blocks have also been utilized to minimize postoperative pain.89,90 More recently, use of
continuous local anesthetic delivery systems (e.g., I-Flow) have been found to improve pain control
after major ambulatory orthopedic surgery by extending periopheral nerve blocks.91-93 Patient-
14
controlled local anesthetic delivery has also been described for improving pain relief after discharge
home.94 Following laparoscopic procedures, abdominal pain can also be minimized by the use of a
local anesthesia at the portals and topically applied at the surgical site.95,96 Shoulder pain is also
common following laparoscopic surgery, and this has been reported to be reduced with
subdiaphragmatic instillation of local anesthetic solutions.95 Following arthroscopic knee surgery,
instillation of 30 ml of bupivacaine 0.5% into the joint space reduces postoperative opiate
requirements and permits earlier ambulation and discharge.96 The addition of morphine (1-2 mg),
ketorolac (15-30 mg), clonidine (0.1-0.2 mg) and/or triamcinolone (10-20 mg) to the intraarticular
local anesthetic solution can further reduce pain after arthroscopic surgery.97-99 Electroanalgesia can
also be used as part of a multimodal treatment regimen.100 Future growth in the complexity of surgical
procedures being performed on an ambulatory basis will require further improvements in our ability
to provide effective postoperative pain relief outside the surgical facility (e.g., subcutaneous opioid
PCA, patient-controlled local anesthesia with a disposable infusion system, transcutaneous analgesic
delivery systems).
Summary
Ambulatory anesthesia has become recognized as an anesthetic subspecialty, with the
institution of formal postgraduate training programs. Expansion of the specialty of ambulatory
anesthesia and surgery is likely to continue with the growth in minimally-invasive (so-called keyhole)
surgical procedures. The rate of expansion of ambulatory anesthesia will probably vary depending
upon local needs, the level of ancillary home healthcare services, and economic considerations (101).
Many recently developed drugs have pharmacological profiles which are ideally suited for use in the
ambulatory setting. Use of newer anesthetic and analgesic drugs (e.g., desflurane, sevoflurane,
remifentanil, parecoxib) and brain monitoring systems (e.g., BIS, PSA, and AEP devices) should
facilitate fast-tracking in the ambulatory setting, leading to an early discharge after most surgery
procedures without compromising patient safety. To maintain the high level of patient safety,
mandatory accreditation and credentialing procedures are needed for both hospital-based and free-
standing ambulatory surgery facilities.102
Given the changing pattern of health care reimbursement, it is incumbent upon all practitioners to
carefully examine the impact of new drugs and devices on the quality of ambulatory anesthesia care
they are providing to the patient. Future studies on new drugs and techniques for ambulatory
anesthesia need to focus not only on subjective improvements for the patient during the immediate
perioperative period, but also on the overall cost-effectiveness of the care being provided.28 These
studies must compare the increased cost of newer treatments with the potential financial savings
resulting from earlier discharge home, reduced consumption of supplemental drugs, improvements in
15
patient satisfaction, and perhaps most importantly, resumption of normal activity. The future
challenge that all practitioners must face is to provide high-quality ambulatory anesthesia care for
more complex surgical procedures performed in a wide variety of venues. Finally, the need to
administer the most cost-effective anesthetic technique for a given ambulatory surgery procedure will
likely assume increased importance in the future.
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85. Tang J, Li S, White PF, et al. Effect of parecoxib, a novel intravenous cyclooxygenase-2 inhibitor, on the postoperative opioid requirement and quality of pain control. Anesthesiology 2002; 96: 1305-9.
86. Desjardins PJ, Grossman EH, Kuss ME, et al. The injectable cyclooxygenase-2-specific inhibitor parecoxib sodium has analgesic efficacy when administered preoperatively. Anesth Analg 2001; 93: 721-7.
87. Rusy LM, Houck CS, Sullivan LJ, et al: A double-blind evaluation of ketorolac versus acetaminophen in pediatric tonsillectomy: analgesia and bleeding. Anesth Analg 1995; 80: 226-9.
88. Korpela R, Konvenoja P, Meretoja OA: Morphine-sparing effect of acetaminophen in pediatric day-care surgery. Anesthesiology 1999; 91: 442-7.
89. Ritchie ED, Tong D, Chung F, et al. Suprascapular nerve block for postoperative pain relief in arthroscopic shoulder surgery: A new modality? Anesth Analg 1997; 84: 1306-12.
90. Mulroy MF, Larkin KL, Batra MS, et al. Femoral nerve block with 0.25% or 0.5% bupivacaine improves postoperative analgesia following outpatient arthroscopic anterior cruciate ligament repair. Reg Anesth Pain Med 2001; 26: 24-9
91. Grant SA, Nielsen KC, Greengrass RA, et al. Continuous periopheral nerve block for ambulatory surgery. Reg Anesth Pain Med 2001; 26: 209-14.
92. Illfeld BM, Morey TE, Wang RD, Enneking FK. Continuous popliteal sciatic nerve for postoperative pain control at home. Anesthesiology 2002; 97: 959-65.
93. White PF, Issioui T, Skrivanek GD, et al. Use of a continuous popliteal sciatic nerve block for the management of pain after major podiatric surgery: does it improve quality of recovery? Anesth Analg 2003; 97: 1303-9.
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94. Rawal N, Axelsson K, Hylander J, et al: Postoperative patient-controlled local anesthetic administration at home. Anesth Analg 1998; 86: 86-9.
95. Pasqualucci A, de Angelis V, Contardo R, et al. Preemptive analgesia: Intraperitoneal local anesthetic in laparoscopic cholecystectomy. A randomized, double-blind, placebo-controlled study. Anesthesiology 1996; 85: 11-20.
96. Smith I, Shively RA, White PF. Effects of ketorolac and bupivacaine on recovery after outpatient arthroscopy. Anesth Analg 1992; 75: 208-12.
97. Stein C, Comisel K, Haimerl E, et al. Analgesic effect of intraarticular morphine after arthroscopic knee surgery. N Engl J Med 1991; 325: 1123-6.
98. Reuben S, Connelly NR. Postoperative analgesia for outpatient arthroscopic knee surgery with intraarticular clonidine. Anesth Analg 1999; 88: 729-33.
99. Wang JJ, Ho ST, Lee SC, et al. Intraarticular triamcinolone acetonide for pain control after arthroscopic knee surgery. Anesth Analg 1998; 87: 1113-6
100. White PF, Li S, Chiu JW: Electroanalgesia: its role in acute and chronic pain management. Anesth Analg 2001; 92: 505-13.
101. White PF: Ambulatory anesthesia advances into the new millennium. Anesth Analg 2000; 90: 1234-5.
102. Rohrich RJ, White PF. Safety of outpatient surgery: Is mandatory accreditation of outpatient surgery centers enough? Plastic Reconstr Surg 2001; 107:189-92.
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