perioperative transesophageal echocardiography
TRANSCRIPT
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Perioperative
Transesophageal
EchocardiographyJOHN SHIELDS CRNA
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Learner Outcomes
Describe cardiac anatomy and pathology
associated with the eleven basic perioperative
TEE views
Discuss the practical application of Doppler as
used for basic TEE
Identify billing considerations for TEE
Discuss TEE and scope of practice acquisition
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Transesophageal Echo
Most robust monitor of cardiac
and hemodynamic function
o Direct assessment vs. indirect
assessment
o May be placed any time
intraoperatively as long as the
head is accessible
Use of ultrasound imaging
Observer dependent
interpretation
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Ultrasound and Transesophageal Echo
Echo passes sound waves through a medium or tissue
o Transducer converts electrical energy into pulses of sound
o Returning pulses of sound are converted into energy which generates an image
Acoustic impedance of different tissues affects wave propagation and image
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2-D Ultrasound
Imaging
Probe is placed in the
esophagus in one of three
positions and US beam
generated
Reflected signals are
collated to produce an
image
A two-dimensional (2-D)
image is generated of the
structures
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Information Available by Basic TEE
Left and right ventricular function
Heart wall motion
Heart chamber volume
Vessel integrity
Valve function and integrity
Heart tumors
Pericardial effusion
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Indications for Basic PTE
Cardiopulmonary instability
Suspicion of global and
regional left ventricular
dysfunction
Myocardial ischemia and wall
motion abnormalities
Right ventricular dysfunction
Hypovolemia
Pulmonary/venous air embolus
Aortic dissection
Basic valve lesions (stenosis
and regurgitation)
Cardiac tumors
Pericardial/pleural effusion
Simple congenital heart
disease in adults
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Probe/Equipment Considerations
Probe Insertion
Bite block
Generous lubrication
Jaw thrust may be utilized
Mac blade (?)
Insert to 30-35 cm
Contraindications include esophageal and gastric pathology
Complications
Esophageal perforation
Gastrointestinal hemorrhage
Oral/lip damage (most common)
Airway compromise
Distraction from patient
Misinterpretation
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TEE Knobology
1. On/Off
2. Quick keys
3. Gain
4. iScan (auto gain)
5. Depth adjustment
6. Zoom image
7. Color imaging
8. Freeze the image
9. Acquire an image
10. Caliper (straight line)
11. Trace image (area)
12. Pulse Wave Doppler
13. Continuous Wave Doppler
12
34
567
8
9
10
11
12
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Probe Manipulations
Lateral tilt
Ante/retroflex
Omniplane
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Transesophageal Echo Imaging
Maneuvers
Advance or withdraw the probe
Turn the probe from side to side
Rotate the sector (imaging
plane) from 0-180 degrees
(“omni”)
Change the angle of the probe
o Forward (anteflex)
o Backward (retroflex)
o Left or right
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Transthoracic vs. Transesophageal Views
Key TEE Views
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ME 4 chamber ME 2 chamber ME LAX ME Ascending Aorta LAX
ME Ascending Aorta SAX ME Aortic Valve SAX ME RV Inflow-Outflow ME Bicaval
Transgastric Mid SAX ME Desc Aorta SAX ME Desc Aorta LAX
Basic 11 TEE Windows
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ME 4 Chamber
LA
RA
LVRV
MV
TV
AntLat Wall
IS Wall
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LA
LV
LAA
ME 2 Chamber
Ant Wall
Inf
Wall
ME 2 Chamber
LA
InfWall
LV Ant Wall
LAA
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ME AV LAX
LA
LV
RV
LVOT
AV
Aorta
AntSept Wall
InfLat Wall
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Mitral Prolapse and Aortic Stenosis
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ME Bicaval
LA
RA
SVC
IVC
IAS
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Aorta
Desc Thoracic Aorta SAX
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Aorta
Desc Thoracic Ao LAX
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Descending Aorta SAX and LAX
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TG SAX
Anterior
Lateral
Inferior
AL
PM
LV
RV
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ME AV SAX
LA
RA
RV
PV
PA
NCCLCC
RCC
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ME RV Inflow Outflow
LA
RA
RV
PVTV
AV
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ME Asc Aorta
SAX
SVC
Asc Ao
PA
RPA
PV
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ME Asc Aorta
LAX
Asc Ao
RPA
RA
RV
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Doppler Imaging
Doppler ultrasound provides directionand velocity of flow
o Moving objects change the frequency of returning sound waves
o Shift in frequency is determined by the velocity and direction of the object
Direction and velocity of blood is depicted as:
o Red-towards the transducer
o Blue-away from the transducer
“BART”
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Use of Doppler to Plot Velocity over Time
Flow towards and away from the
transducer is plotted as velocity vs.
time
High velocity flow across a valve
signifies stenosis
Bidirectional flow may signify
regurgitation
Pulse wave Doppler measures flow in
a specific sample
Continuous wave Doppler measures
all flow along a line
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Calculating Ejection Fraction
Ejection Fraction may be
calculated by “eyeball EF”
or formula
Ejection Fraction=
End-diastolic area minus
end-systolic area
End-diastolic area
EF=(EDA-ESA)/EDA
EF=(9.46-4.08)/9.46=57%
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Calculating Ejection Fraction
“Good vs bad”
instead of exact EF
Calculation is the
same:
EF=(EDA-ESA)/EDA
EF=(25.6-17.3)/25.6
=32%
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Eyeball EF
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Calculating Stroke Volume
Outside of Doppler flow
waveform is traced to
provide velocity time
integral (VTI)
VTI is multiplied by the
orifice’s cross sectional
area (CSA) to obtain
stroke volume
SV=VTI x CSA VTI=19 cm Diameter =2.0 cm
CSA=22 x
0.785=3.14
SV=19 x 3.14=60 ml
VTI
CSA
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Calculating Pulmonary Artery Systolic
Pressure (PASP)
Doppler of tricuspid
regurgitation measures
maximum velocity (Vmax)
Peak gradient across the
valve is calculated using
modified Bernoulli equation
(4 x vmax2)
PASP=CVP + peak gradient
For CVP 12, max TR velocity 2 m/s,
PASP=12 + (4 x 22)=28 mmHg
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Calculating Valve Area Using
the Continuity Equation
Continuity equation is used
to assess aortic valve area
(CSAAV)
CSAAV=CSALVOT x
(VTILVOT/VTIAV)
CSAAV=3.14 x (15/60)=0.79
cm
Aortic Valve Area = 0.79
cm (severe Aortic Stenosis)
=2
cm
15
60
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Calculating Valve Gradients
Pressure drop across an orifice may be
calculated using the modified Bernoulli
equation
o Gradient=4(V)2
o “V” is the velocity across the orifice
Gradient across a valve is calculated
and degree of stenosis assessed
o <36 mmHg is mild
o > 36 mmHg is moderate to severe
Gradient=4 x (1.5 m/s)2=9 mmHg
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Utility of Perioperative TEE
Entire perioperative pathway
o TTE preop/postop
o Intraoperative hemodynamic
monitoring and rescue
Subspecialties already utilizing TEE
o Liver transplant
o Vascular/neuroanesthesia
o Intensive care/ER
o Cardiac anesthesia
o Obstetrics
Major issue is manpower and
training
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Transesophageal Echo Training and
Accreditation
Training
o Point of care
o Simulation
Training pathways
o Fellows/resident anesthesiologists
o ER physicians
o Nurse anesthetists?
Accreditation/certification
o Monitoring
o Diagnostic
o Interventionalist
Experts
Accredited Echocardio
grapher
Intermediate Echocardiographer
seeking accreditation
Basic echocardiographer(skills acquired via
introductory training)
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Documentation and Billing for TEE
Reporting
Date and time of study
Name and MR number of patient
DOB, age, gender
Indication for study
Documentation of informed consent for TEE
Name of interpreting physician
Findings/impression
Complications if any
Date/time report was signed
Mode of archiving video
Billing
CPT Description Fee
93312 TEE including probe placement, image
acquisition, interpretation and report
$334
93313 TEE probe placement only $43
93314 TEE including image acquisition,
interpretation and report
$309
93318 TEE including probe placement, image
acquisition, interpretation and report
leading to ongoing (continuous)
assessment of cardiac pumping
function and to therapeutic measures
on an immediate time basis
$114
93320 Doppler pulsed wave and/or
continuous wave with spectral display
(listed separately, complete study)
$55
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Scope of Practice and
Transesophageal Echo
Basic PTE exam is not designed to prepare
practitioners for the full potential of TEE as a
diagnostic tool (monitoring only)
ASE/SCA have described the critical role of TEE in
the care of an unstable surgical patient for non-
cardiac anesthesiologists
Role of the CRNA and advanced practice nurses is
part of the evolution of care
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Other Providers and Point of Care
Ultrasound (POCUS) Training
ACGME (IV.A.5.a).(2).(m) requires competency in ultrasound for
cardiac, thoracic, vascular and regional techniques
Nurse midwifes are ultrasound certified, document and can bill for
their services
Nurse practitioners in the ICU are currently using POCUS and have
demonstrated 86% accuracy in acquiring and interpreting images
Council on Accrediation declared TEE scope of practice but no
prerequisites for graduation
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TEE Simulation Outcomes*
36.133.5
69.7
42.4
20
30
40
50
60
70
80
Simulator Online
Simulator vs. Online
Pretest Posttest
Utilizing standardized exam
(Toronto PIE) students
scored 35% on pre-test
Post-simulation simulator
scores averaged 70%,
online simulation (PIE) 42%
Resident anesthesiologists,
surgeons and cardiologists
had similar scores
*Shields J, Gentry R. Effect of Simulation Training on Transesophageal Echocardiography Cognitive Performance. AANA Journal, publication pending.
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Conclusions
Qualitative assessments include valve competence, embolism, ventricular function, volume status and pericardial effusion
Quantitative assessment includes valve area, degree of stenosis, valve pressure gradients, stroke volume and pulmonary artery pressure
Echo is very useful as a diverse hemodynamic monitoring modality and is no longer just for cardiac anesthesia
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References
Reeves et al-Basic perioperative transesophageal echocardiography examination: A consensus statement of the American Society of Echocardiography and the Society of Cardiovascular Anesthesiologists. J Am Soc Echocardiogr, 2013, 26:443-456
Shanewise J et al. ASE/SCA Guidelines for Performing a Comprehensive Intraoperative Multiplane Transesophageal Echocardiography Examination: Recommendations of the American Society of Echocardiography Council for Intraoperative Echocardiography and the Society of Cardiovascular Anesthesiologists Task Force for Certification in Perioperative Transesophageal Echocardiography. Journal of the American Society of Echocardiography, Volume 12 , Issue 10 , 884 - 900