table of normal values

18
FACTS AND FORMULAS Hariharan Thangarajah • Saif A. Ghole Cardiovascular Cardiac output (CO) SV HR (3 to 7 liters/min) Fick equation for CO (O 2 consumed)/(arterial O 2 venous O 2 content) Cardiac index (CI) CO/BSA (3.0 to 4.0 L/min/m 2 ) Ejection fraction SV/EDV 100 (55% to 75%) Mean arterial pressure (MAP) CO systemic vascular resistance MAP diastolic pressure 1 3 pulse pressure (70 to 105 mm Hg) Pulse pressure systolic pressure diastolic pressure ( 40 mm Hg) Systemic vascular resistance (SVR) (MAP right arterial pressure)/CO; or (MAP central venous pressure)/CO (700 to 1600 dynes/sec/cm 2 ) Normal Pressures Systemic arterial pressure: (100-140)/(60-90) mm Hg Left ventricle: (100-140)/(3-12) mm Hg Pulmonary capillary wedge pressure (PCWP) Left atrial mean: 3 to 12 mm Hg Pulmonary artery: (15-30)/(4-14) mm Hg Right ventricle: (15-30)/(2-7) mm Hg Central venous pressure (CVP): 0 to 8 mm Hg Right atrium Mean: 2 to 6 mm Hg A-wave: 2 to 8 mm Hg V-wave: 2 to 7 mm Hg Pulmonary A-a O 2 gradient: PAO 2 PaO 2 Quick Reference 2 — Quick Reference 17 PROPERTY OF ELSEVIER SAMPLE CONTENT - NOT FINAL

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Guide to normal values commonly used in medicine

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  • FACTS AND FORMULASHariharan Thangarajah Saif A. Ghole

    Cardiovascular

    Cardiac output (CO) SV HR (3 to 7 liters/min) Fick equation for CO (O2 consumed)/(arterial O2 venous O2 content) Cardiac index (CI) CO/BSA (3.0 to 4.0 L/min/m2) Ejection fraction SV/EDV 100 (55% to 75%) Mean arterial pressure (MAP) CO systemic vascular resistance MAP diastolic pressure 13 pulse pressure (70 to 105 mm Hg) Pulse pressure systolic pressure diastolic pressure ( 40 mm Hg) Systemic vascular resistance (SVR) (MAP right arterial pressure)/CO;

    or (MAP central venous pressure)/CO (700 to 1600 dynes/sec/cm2)

    Normal Pressures

    Systemic arterial pressure: (100-140)/(60-90) mm Hg Left ventricle: (100-140)/(3-12) mm Hg Pulmonary capillary wedge pressure (PCWP) Left atrial mean: 3 to

    12 mm Hg Pulmonary artery: (15-30)/(4-14) mm Hg Right ventricle: (15-30)/(2-7) mm Hg Central venous pressure (CVP): 0 to 8 mm Hg Right atrium

    Mean: 2 to 6 mm Hg A-wave: 2 to 8 mm Hg V-wave: 2 to 7 mm Hg

    Pulmonary

    A-a O2 gradient: PAO2 PaO2

    Quick Reference

    2 Quick Reference 17

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  • Alveolar gas equation: PAO2 FiO2 (Patm PH2O) PaCO2/RQ Normal adult 0.21(760 47) (40/0.8) 100

    1. PaCO2 0.86(VCO2)/VAlv2. O2 content (arterial) 1.34(Hb)SaO2 0.003(PaO2)3. Minute ventilation: tidal volume respiratory rate4. Typical tidal volume: Weight (in kg) 105. Rapid shallow breathing index (RSBI) Spontaneous respiration rate/tidal

    volume (in liters); (desired value 100 to predict successful extubation)6. Improve oxygenation: (1) increase FiO2; (2) increase PEEP; (3) adjust

    inspiratory/expiratory ratio; (4) prone positioning (rarely done)7. Improve ventilation: (1) increase rate; (2) increase tidal volume

    Renal

    Normal adult urine output 0.5 to 1 ml/kg/hr Normal infant urine output 2 ml/kg/hr Fractional excretion of sodium (FENa)

    (Urinary Na)(Plasma creatinine)(Plasma Na)(UUrinary creatinine)

    100

    (in prerenal azotemia, FENa is 1%, ATN is 2%) Creatinine clearance (for 24-hour urine collection) (UCr UVolume)/

    (PCr 1440) (75 to 160 ml/min) Estimated creatinine clearance

    (140 age)(weight in kg)(serum creatinine)(722)

    ( 0.85 in females)

    Average glomerular ltration rate 125 ml/min Renal blood ow 1200 ml/min Indications for dialysis:

    Acidosis (severe, refractory to treatment) Electrolyt abnormality (hyperkalemia) Ingestions (overdose) Overload ( uid) Uremia

    Fluids, Electrolytes, Nutrition

    Water balance: Fluid in: 2500 ml/day (35 ml/kg/day baseline) Fluid out: 1400 to 2300 ml/day

    Total body water Weight (in kg) 0.6 (male) or 0.5 (female) Intracellular water Weight (in kg) 0.4 Extracellular water Weight (in kg) 0.2

    2 Quick Reference 18

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  • 2 Quick Reference 19

    Plasma volume Weight (in kg) 0.05 Desired TBW (PNa TBW)/Normal Na Na de cit Desired TBW TBW (140 Plasma Na) TBW

    Water de cit TBW (Serum Na 140140

    )

    Serum osmolality 2(Na) BUN2.8 18

    glucose+ (275 to 290 mosm/kg)

    Corrected Na Measured Na (glucose 100) 0.016or for every 100 mEq/L increase in glucose (200), Na decreases by 1.6 mEq

    Corrected Ca (for hypoalbuminemia) Measured Ca 0.8 (4 measured albumin) or if albumin 4.0, for every 1.0 mg/dL less than 4 mg/dL add 0.8 mg/dL to Ca

    Anion gap Na (Cl HCO3) (10 to 12) Anion gap adjusted (for hypoalbuminemia) Na (Cl HCO3)

    2.5(4 Alb) Dilantin level adjusted for low albumin (4.5): (Dilantin measured)/[(0.2

    serum albumin) 0.1]

    Miscellaneous

    Parkland formula 4 ml/kg % burn uid given over 24 hours: Administer 12 of total in rst 8 hours Administer 12 of total over next 16 hours

    Volume of distribution amount drug in body/plasma drug concentration Weight conversion: lb kg 2.2 Temperature conversion: C (F 32)(5/9)

    Epidemiology

    Sensitivity, speci citydz dz

    test a btest c d

    Sensitivity a/(a c) (Screening test) Speci city d/(b d) (Con rming test) Positive predictive value a/(a b) (In uenced by prevalence) Negative predictive value d/(b d) (In uenced by prevalence)

    Odds ratio, relative riskdz dz

    exposure a bexposure c d

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  • Odds ratio [a/c]/[b/d] ad/bc (Retrospect studies, rare diseases) Relative risk [a/(a b)]/[c/(c d)] (Prospective studies) Attributable risk [a/(a b)] [c/(c d)]

    COMMON DRIPS USED IN THE ICUBethany J. Slater

    2 Quick Reference 20

    Medication Dose IndicationComments/Adverse E ects

    Vasopressors

    Dopamine 1-20 g/kg/min Cardiogenic, septic shock; low dose can preserve renal blood ow and promote urinary output

    May cause tachyar-rhythmias, ischemic limb necrosis

    Phenylephrine (Neo-Synephrine [Bayer Corporation, West Haven, CT])

    10-200 g/min Hypotension Pure alpha-agonist

    Norepinephrine (Levophed [Abbott Laboratories, Abbott Park, IL])

    1-20 g/min Septic shock with hypotension refrac-tory to dopa (low systemic vascular resistance and adequately resuscitated)

    Potent alpha-agonist (vasoconstrictor), avoid in cardio-genic shock

    Vasopressin 0.01-0.04 units/min

    Refractory vasodila-tory shock (late)

    Avoid with CAD

    Dobutamine 2-20 g/kg/min Severe systolic heart failure

    Inotrope and sys-temic vasodilator

    Epinephrine 1-20 g/min or 30-100 ng/kg/min

    Second-line for cardiogenic shock

    Chronotrope, inotrope, and vasoconstrictor

    Antihypertensives

    Nitroprusside (Nipride [Roche Laboratories, Nutley, NJ])

    0.5-5 g/kg/min Severe hypertension (particularly with low CO)

    Potent vasodilator, caution in renal and hepatic failure (cyanide/thiocyanide toxicity); do not use alone in dissection (re ex tachycardia); can decrease PaO2 due to pulmonary shunting

    PROP

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  • 2 Quick Reference 21

    Medication Dose IndicationComments/Adverse E ects

    Nitroglycerin 10-400 g/min Decreased BP/hypertensive crisis; augment CO (intermediate dose) angina (low dose, typically 0.3-0.6 mg SL q5 min)

    Predominantly venodilator, mediated by NO; rapid onset; headache; increased ICP; methemglo-binemia; tachy-phylaxis

    Nicardipine 5-15 mg/hr Hypertension, decreased cerebral vasospasm

    Potent calcium channel blocker; vasodilator; renal clearance

    Diltiazem 5-15 mg/hr Hypertension, atrial brillation

    Ca channel blocker, monitor HR and BP especially if also on beta-blocker

    Esmolol 50-300 g/kg/min

    Hypertension, particularly with aortic dissection, supraventricular tachycardia

    beta-1 blocker, short acting

    Paralytics

    Vecuronium 0.05-0.1 mg/kg/hr

    Paralysis Monitor muscular twitch (2/4 train-of-four); nonde-polarizing; onset 1-2 min; caution with hepatic fail-ure; caution with steroids (includ-ing myopathy)

    Cisatracurium 0.5-10 g/kg/min

    Paralysis with renal or hepatic failure

    Nondepolarizing, Ho man elimination

    Sedatives

    Midazolam (Versed [Roche Laboratories, Nutley, NJ])

    1-10 mg/hr Sedation Potent, short acting but can result in accumulation

    CAD, coronary artery disease.

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  • 2 Quick Reference 22

    SURGICAL SUTURESDe nitions

    Tensile strength: Weight required to break a suture/cross-sectional area of suture. Increased suture size (e.g., 4-0 or 2-0) translates to decreased cross-sectional area, which effectively decreases the tensile strength.

    Tissue reactivity: Natural bers (silk and gut) cause more in ammation than synthetic bers (PDS and Vicryl [Ethicon Inc., Somerville, NJ]).

    Confi guration: Twisted, braided, mono lament. Knot security: Braided and uncoated sutures hold the knot better. Infection risk: Braided suture can harbor bacteria.

    Absorbable

    SutureTrade Name Con guration

    Tensile Strength

    Tissue Reaction

    Common Uses

    Fast gut Twisted 3-5 Scalp and facial lacerations in children

    Plain gut Twisted 5-7 Vessel ligation, mucosa

    Chromic gut Twisted 10-14 Vessel ligation, mucosa, GI tract, viscera

    Polyglecap-rone 25

    Monocryl (Ethicon, Inc., Somerville, NJ)

    Mono lament 7 Subcutane-ous tissue, skin, GI tract

    Polyglycolic acid

    Dexon (Syne-ture, Norwalk, CT)

    Braided 14-21 GI tract, vessel ligation

    Polygalactic acid

    Vicryl (Ethicon, Inc., Somer-ville, NJ)

    Braided 14-21 Fascia, viscera, GI tract, muscle, vessel ligation

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  • 2 Quick Reference 23

    Nonabsorbable

    SutureTrade Name Con guration

    Tensile Strength

    Tissue Reaction

    Common Uses

    Polydioxa-none

    PDS (Ethicon, Inc., Somer-ville, NJ)

    Mono lament 28 Fascia, cosmetic closures, GI tract, muscle

    Polygly-conate

    Maxon (Syneture, Norwalk, CT)

    Mono lament 28 GI tract, cosmetic closures, muscle, fascia

    SutureTrade Name Con guration

    Tensile Strength

    Tissue Reaction

    Common Uses

    Silk Braided Good Vessel ligation, GI tract

    Nylon Ethilon (Ethicon, Inc., Somer-ville, NJ), Dermalon (Syneture, Norwalk, CT)

    Mono lament High Skin, drain stitches, fascia, vascula-ture

    Nylon Nurolon (Ethicon, Inc., Somer-ville, NJ), Surgilon (Syneture, Norwalk, CT)

    Braided High Neurosur-gery, tendons

    Polypropyl-ene

    Prolene (Ethicon, Inc., Somer-ville, NJ), Surgilene (Surgitech Surgical Sutures)

    Mono lament Good Cardiac tissue, vascula-ture, fascia, skin, tendons, neurosur-gery

    Continued on following page

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  • REGULAR INSULIN (SQ) SLIDING SCALE

    2 Quick Reference 24

    SutureTrade Name Con guration

    Tensile Strength

    Tissue Reaction

    Common Uses

    Polyester Ethibond (Ethicon, Inc., Somer-ville, NJ), Tycron (Tyco Healthcare, Mans eld, MA)

    Braided High Cardiac tissue, vascular, fascia, tendon

    Polybutester Novo l (Syneture, Norwalk, CT)

    Mono lament High Fascia liga-ments, tendons

    Stainless Steel

    Ethisteel (Ethicon, Inc., Somer-ville, NJ), Flexon (Syneture, Norwalk, CT)

    Mono lament High Sternal closure, orthope-dics, drain stitches, fascia

    Finger Stick Blood Glucose Mild Scale Moderate Scale Aggressive Scale

    60 1 amp (25 g) D50 or orange juice, call MD

    1 amp D50 or orange juice, call MD

    1 amp D50 or orange juice, call MD

    60-150 No insulin No insulin No insulin151-200 No insulin 3 units 4 units201-250 2 units 5 units 6 units251-300 4 units 7 units 10 units301-350 6 units 9 units 12 units351-400 8 units 11 units 15 units400 10 units, call MD 13 units, call MD 18 units, call MD

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  • 2 Quick Reference 25

    STEROID CONVERSION SCALEOscar J. Abilez

    Corticosteroids Approximate Equivalent Dose (mg)

    Relative Anti-in ammatory Potency

    Relative Min-eralocorticoid Potency

    Biologic Half-Life (hours)

    Betamethasone 0.6-0.75 20-30 0 36-54Cortisone 25 0.8 2 8-12Dexamethasone 0.75 20-30 0 36-54Hydrocortisone 20 1 2 8-12Methylprednisolone 4 5 0 18-36Prednisolone 5 4 1 18-36Prednisone 5 4 1 18-36 Triamcinolone 4 5 0 18-36

    Data adapted from Green SM: Tarascon Pocket Pharmacopoeia, Tarascon Inc., 2006.

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  • 2 Quick Reference 26

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  • 2 Quick Reference 27

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  • 2 Quick Reference 28

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  • 2 Quick Reference 29

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  • Adverse Side E ect Management

    Nausea/Vomiting Metoclopramide (Reglan [Schwartz Pharma, Inc., Mequon, WI]): 10 to

    20 mg IV/PO every 3 to 6 hr Promethazine (Phenergan [Wyeth-Ayerst Laboratories, Philadelphia, PA]):

    12.5 to 25 mg IV/PO/PR every 4 to 6 hr Droperidol: 0.625 mg IV every 4 to 6 hr Ondansetron (Zofran [Cerenex, Research Triangle Park, NC]): 4 to 8 mg

    IV every 4 hr

    Pruritis (commonly resolves in 1 to 2 days) Diphenhydramine (Benadryl [P zer, Inc., New York, NY]): 10 to 25 mg

    IV/PO every 4 to 6 hr Hydroxyzine (Atarax, Vistaril [P zer, Inc., New York, NY]): 25 mg PO/IM

    every 6 hr Nalbuphine (Nubain [Endo Pharmaceuticals Chadds Ford, PA]): 2.5 to 5 mg

    IV every 2 to 4 hr

    Constipation Dicosate sodium: 250 mg PO twice daily Milk of magnesia: 30 ml PO twice daily Lactulose: 30 ml PO twice daily Senokot: 1 to 4 tabs PO daily Bisacodyl (Dulcolax [Boehringer Ingelheim Pharmaceuticals, Inc., Ridge-

    eld, CT]): 5 to 10 mg PO or 10 mg PR daily Fleets enema as needed Magnesium citrate: 300 ml PO as needed

    Sedation Decrease dose. Add adjuvant. Change routes to minimize dose (IV to epidural). Change opiates. Adjust dosing schedule to normalize sleep/wake cycle. Avoid drugs with sedating effects.

    Key Concepts

    Administer on scheduled basis. Provide PRNs (as needed) for breakthrough pain. Consider adjuvants (nonsteroidal antiin ammatory drugs [NSAIDs],

    antidepressant sleep agents, anesthetics).

    2 Quick Reference 30

    PROP

    ERTY

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  • 2 Quick Reference 31

    Individualize doses. Consider long-acting preparations when dose is stabilized (fentanyl

    transdermal, methadone). Provide bowel regimen with opiates.

    HEPARIN SLIDING SCALEOscar J. Abilez

    Indication: Pulmonary embolism and/or DVT Initial bolus: 80 U/kg IV Initial rate: 18 U/kg/hr IV Obtain baseline platelet count, then platelet count at least every other day

    while patient is receiving heparin to watch for heparin-induced thrombocy-topenia with thrombosis

    PTT Re-bolus (U) Stop (min) Change (U/hr) Repeat PTT (hrs)

    50 5000 - 200 650-59 - - 100 660-80 - - - next AM81-120 - 30 100 6120 - 60 200 6

    *PTT, Partial thromboplastin time

    PROP

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  • 2 Quick Reference 32

    Type of Surgery Antimicrobial Recommendations

    Cardiac or vascular Preferred: Cefazolin 1-2 gm IV.If -lactam allergy: Clindamycin 600-900 mg IV or vancomycin 1 g IV.If known history of MRSA: Vancomycin 1 g IV

    Colon Preferred: Cefoxitin 1-2 g IV.If -lactam allergy: Metronidazole 500 mg IV and cipro oxacin 400 mg IV

    General surgery (hepatobiliary, gastroduodenal)

    Preferred: Cefoxitin 1-2 g IV. If -lactam allergy: Metronidazole 500 mg IV and cipro oxacin 400 mg IV

    Other general surgical procedures (e.g. hernia repair, breast)

    Preferred: Cefazolin 1-2 g IV.If -lactam allergy: Clindamycin 600-900 mg IV or vancomycin 1 g IV.If known history of MRSA: Vancomycin 1 g IV

    Gynecological procedures (e.g., hysterectomy, C-section)

    Preferred: Cefoxitin 1-2 g IV. If v-lactam allergy: Metronidazole 500 mg IV and cipro oxacin 400 mg IV

    Neurosurgery Preferred: Cefazolin 1-2 g IV.If -lactam allergy: Clindamycin 600-900 mg IV or vancomycin 1 g IV.If known history of MwRSA: Vancomycin 1 g IV

    SURGICAL CARE IMPROVEMENT PROJECT RECOMMENDATIONSTom C. Nguyen

    De nition

    Surgical Care Improvement Project (SCIP) is a national quality partnership committed to improving patient safety by driving down postoperative com-plications by 25% by 2010. By implementing SCIP quality measures, hospi-tals could prevent an estimated 13,000 patient deaths and 271,000 surgical complications each year.

    The SCIP Measures

    Antibiotic prophylaxis: (1) Antibiotic received within 1 hour prior to surgical incision, (2) antibiotic selection for surgical patients, and (3) antibiotics discontinued within 24 hours after surgery time, 48 hours for CABG and other cardiac surgery.

    PROP

    ERTY

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  • 2 Quick Reference 33

    Surgery and Level of Risk VTE Prophylaxis

    General surgery, moderate to high risk. Open surgical procedure 30 min requiring in-hospital stay 24 hr postoperative.

    Any of the following: Low-dose unfractionated heparin (LDUH)

    5000 units twice or three times daily Low molecular weight heparin (LMWH) LDUH or LMWH combined with

    intermittent pneumatic compression (IPC) or graduated compression stockings (GCS)

    General surgery with high risk for bleeding (based on physician documentation of bleeding risk). Open surgical procedure 30 min requiring hospital stay 24 hr postoperative.

    Any of the following: GCS IPC

    Urologic surgery. Open surgical procedure 30 min requiring hospital stay 24 hr postoperative.

    Any of the following: LDUH 5000 units twice or three times

    daily LMWH IPC GCS LDUH or LMWH combined with IPC or

    GCS

    Continued on following page

    Type of Surgery Antimicrobial Recommendations

    Orthopedic: hip/knee arthroplasty (infuse completely before tourniquet in ation)

    Preferred: Cefazolin 1-2 g IV. If -lactam allergy: Clindamyin 600-900 mg IV or vancomycin 1 g IV.If known history of MRSA: Vancomycin 1 g IV

    MRSA, Methicillin resistant staphylococcus aureus.

    Glucose: Cardiac surgery patients with controlled 6 am postoperative serum glucose (200 mg/dl) on postoperative days 1 and 2.

    Hair removal: Surgery patients with appropriate hair removal. No hair removal or removal with clippers or depilatory is considered appropriate.

    Normothermia: Colorectal surgery patients with immediate normothermia (96.8 F) within the rst hour after leaving OR.

    B-block: Surgery patients on beta-blocker therapy prior to admission who received a beta-blocker during the perioperative period.

    VTE: Venous thromboembolism prophylaxis: (1) Surgery patients with recom-mended VTE prophylaxis ordered, (2) surgery patients who receive appropriate VTE prophylaxis within 24 hours prior to surgery to 24 hours after surgery.

    PROP

    ERTY

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    LSEV

    IER

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    ONTE

    NT - N

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  • REFERENCE

    Brendle TA: Surgical Care Improvement Project and the perioperative nurses role. AORN J 86(1):94-101, 2007.

    2 Quick Reference 34

    Surgery and Level of Risk VTE Prophylaxis

    Elective total hip replacement. Open surgical procedure 30 min requiring hospital stay 24 hr postoperative.

    Any of the following started within 24 hr of surgery:

    LMWH Fondaparinux 2.5 mg Adjusted-dose warfarin (INR target

    2.5, range 2.0-3.0)Elective total knee replacement.

    Open surgical procedure 30 min requiring hospital stay 24 hr postoperative.

    Any of the following: LMWH IPC Fondaparinux 2.5 mg Adjusted-dose warfarin (INR target

    2.5, range 2.0-3.0)Hip fracture surgery. Open surgical

    procedure 30 min requiring hospital stay 24 hr postoperative.

    Any of the following: LMWH LDUH Fondaparinux 2.5 mg Adjusted-dose warfarin (INR target

    2.5, range 2.0-3.0)Hip fracture surgery or elective

    total hip replacement with high risk for bleeding (based on physician documentation of bleeding risk). Open surgical procedure 30 min requiring hospital stay 24 hr postoperative.

    Any of the following: GCS IPC

    Elective spinal surgery (with addi-tional risk factors such as advanced age, known malignancy, presence of a neurologic de cit, previous VTE, or an anterior surgical approach). Open sur-gical procedure 30 min requiring hospital stay 24 hr postoperative.

    Any of the following: LDUH IPC LMWH GCS IPC combined with GCS LDUH or LMWH combined with IPC or

    GCSIntracranial neurosurgery. Open sur-

    gical procedure 30 min requiring hospital stay 24 hr postoperative.

    Any of the following: LMWH IPC with or without GCS LDUH LDUH or LMWH combined with IPC or

    GCS

    Ch02_017-034-A03977.indd 34Ch02_017-034-A03977.indd 34 8/14/08 8:34:04 PM8/14/08 8:34:04 PM

    PROP

    ERTY

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    LSEV

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    ONTE

    NT - N

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