richard browne, md sanger clinic cardiology
TRANSCRIPT
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RICHARD BROWNE, MDSANGER CLINIC CARDIOLOGY
STRESS TESTING FOR CORONARY ARTERY DISEASE WHAT IS BEST CHOICE FOR YOUR PATIENT
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STRESS
Any stimulus, as fear or pain, that disturbs or interferes with the normal physiological equilibrium of an organism
-The Random House College Dictionary-
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Common Types of Stress Tests
Routine Treadmill (ECG only) Exercise Echocardiography Exercise Nuclear Stress Dobutamine Echocardiography Dobutamine Nuclear Stress Adenosine Nuclear Stress Persantine Nuclear Stress
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Three States of the Sodium Channel and the Normal Sodium Current (INa)
Ca++
outin
out
in
Na+/Ca++
Exchanger
Ca++
Ca++
Ca++
Ca++
Na+
Na+
Na+
Na+Na+
Na+
Na+
RestingClosed
Na+
Activated Inactivated
Na+
Na+
Na+ Ca++
Ca++
0
Late
Peak
SodiumCurrent
[Na]140 mM ~ 10mM
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Ischemia Induced Effects on Late INa andIntracellular Calcium
Ca++
Na+/Ca++
Exchanger
Ca++
Na+
Na+Na+
Na+
Na+
Na+Na+Na+
Na+
Na+
Ca++Ca++Ca++
Ca++
Ca++Ca++ Ca++
Ca++
Ca++
Ca++ Ca++
Excess Calcium:• Electrical instability• Contractile
dysfunction• ECG changes
0
Late
Peak
out
in
outin
Na+
Na+
Na+
Na+ Ca++
Ca++
ImpairedInactivation
Ca++
SodiumCurrent
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Cellular Mechanism of Ischemia
Consequence(s) of Mechanical DysfunctionMechanical Dysfunction
• Abnormal Contraction and RelaxationAbnormal Contraction and Relaxation
• Diastolic TensionDiastolic Tension
O2 Consumption(to maintain tonic contraction)
ATP Hydrolysis
Diastolic Wall Tension (Stiffness)Diastolic Wall Tension (Stiffness)
OO22 Demand Demand OO22 Supply Supply
Extravascular Compression
Blood Flow to Microcirculation( O2 delivery to Myocytes)
Modified from: Belardinelli et al. Eur Heart 8 (Suppl. A):A10-A13, 2006
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How good is exercise ECG testing?
Gianrossi R, Detrano R, Mulvihill D, et al. Exercise-induced ST depression in the diagnosis of coronary artery disease. Circulation 1989; 80:87-98.
Meta-analysis of 147 consecutive studies involving 24,074 patients
62
6466
68
70
72
7476
78
SENSITIVITY SPECIFICITY
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Sensitivity Comparison of Different Testing Modalities
0102030405060708090
100
1 vessel 2 vessel 3 vessel All CAD
Stress ECGStress ECHONuclear
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SPECIFICITY OF DIFFERENT STRESS TESTING MODALITIES
0102030405060708090
Stress NuclearStress ECGStress ECHO
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“The Best Things in Life are Free” Janet Jackson & Luther Vandross, 1994.
GOOD NEWS: Imaging modalities improve the diagnostic accuracy of stress ECG testing.
BAD NEWS: Cost is substantial. Professional Fee Technical Fee Total Cost
Exercise Stress Test
$250 $172 $522
Stress Echo
$429 $258 $687
Myocardial Perfusion
$539 $1395 $1934
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Questions to Ask When Picking a Test
Can the patient exercise on the treadmill or is pharmacological stress testing needed?
Can the patient have a routine stress ECG treadmill test or is adjunctive imaging (Nuclear or ECHO) needed?
If imaging needed, which one should be used? If pharmacological stress needed instead of
exercise, which agent to use?
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Information obtained from Exercise Stress but not available with Pharmacological Test
Exercise Duration/Tolerance Reproducibility of Symptoms with Activity Heart rate response to exercise Blood Pressure response Detection of Stress Induced Arrhythmias Assess control of angina with medical therapy Prognosis
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DUKE TREADMILL SCORE Duration of exercise on treadmill (in minutes)
Amount of ST segment depression (in millimeters)
Treadmill Angina index: 0 = No Angina 1 = Non-limiting Angina 2 = Limiting Angina
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DUKE TREADMILL SCORE
Duration of exercise on treadmill (in minutes) minus 5x (millimeters of maximal ST segment depression) minus 4X (treadmill anginal index)
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DUKE TREADMILL SCORE
Duration of exercise on treadmill (in minutes) minus 5x (millimeters of maximal ST segment depression) minus 4X (treadmill anginal index)
Example: Patient walked on treadmill for 11 minutes without chest pain. ECG showed one mm of ST segment deviation.
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DUKE TREADMILL SCORE
Duration of exercise on treadmill (in minutes) minus 5x (millimeters of maximal ST segment depression) minus 4X (treadmill anginal index)
Example: Patient walked on treadmill for 11 minutes without chest pain. ECG showed one mm of ST segment deviation.
Duke Score: +6 = 11 minus 5x (1) minus 4x (0)
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PROGNOSIS: DUKE TREADMILL SCORE
0
5
10
15
20
25
Four Year Event Rate
+5 or Greater-10 to +4Less than -10
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Questions to Ask When Picking a Test
Can the patient exercise on the treadmill or is pharmacological stress testing needed?
Can the patient have a routine stress ECG treadmill test or is adjunctive imaging (Nuclear or ECHO) needed?
If imaging needed, which one should be used? If pharmacological stress needed instead of
exercise, which agent to use?
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Patients Appropriate for Routine ECG Stress Test without Imaging
Patient can exercise for 6 or more minutes
Normal baseline ECG
No history of diabetes
No history of coronary revascularization
No history of myocardial infarction
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Questions to Ask When Picking a Test
Can the patient exercise on the treadmill or is pharmacological stress testing needed?
Can the patient have a routine stress ECG treadmill test or is adjunctive imaging (Nuclear or ECHO) needed?
If imaging needed, which one should be used? If pharmacological stress needed instead of
exercise, which agent to use?
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Advantages of Stress Echocardiography Compared to Nuclear Stress Testing
Higher Specificity Visualization of cardiac valves Evaluate for presence of pericardial effusion Ability to measure RV Systolic Pressure More accurate assessment of LV ejection fraction Doppler interrogation to determine Diastolic Function Lower Cost Lack of Radiation Exposure
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Factors decreasing sensitivity of exercise stress echocardiography
Ischemic myocardium can resume function in as little as 10 seconds after exercise so the “ischemic moment” can be missed if images are obtained too long after exercise completed
Small vessels may not create large enough of an ischemic zone to generate a wall motion abnormality that is detectable
Suboptimal visualization of endocardium
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PRE-OPERATIVE RISK STRATIFICATION WITH DOBUTAMINE STRESS ECHO
05
1015202530354045
Operative Cardiac Event Rate
Ischemia at<60% MPHRIschemia at>60% MPHRNo Ischemia
*Mayo Clinic, 530 Patients
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Advantages of Nuclear Stress Testing Compared to Stress Echocardiography
Higher Technical Success Higher sensitivity especially for single vessel
and branch vessel disease
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Sensitivity Comparison of Different Testing Modalities
0102030405060708090
100
1 vessel 2 vessel 3 vessel All CAD
Stress ECGStress ECHONuclear
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Advantages of Nuclear Stress Testing Compared to Stress Echocardiography
Higher Technical Success Higher sensitivity especially for single vessel
and branch vessel disease Better accuracy in evaluating ischemia in the
setting of baseline wall motion abnormalities
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Myocardial Infarction with small zone of adjacent ischemia
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Advantages of Nuclear Stress Testing Compared to Stress Echocardiography
Higher Technical Success Higher sensitivity especially for single vessel
and branch vessel disease Better accuracy in evaluating ischemia in the
setting of baseline wall motion abnormalities Better assessment of severity and size of
ischemic zone
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Nuclear Imaging: Assessment of size and severity of Ischemia
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Advantages of Nuclear Stress Testing Compared to Stress Echocardiography
Higher Technical Success Higher sensitivity especially for single vessel
and branch vessel disease Better accuracy in evaluating ischemia in the
setting of baseline wall motion abnormalities Better assessment of severity and size of
ischemic zone More published data on evaluating prognosis
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Questions to Ask When Picking a Test
Can the patient exercise on the treadmill or is pharmacological stress testing needed?
Can the patient have a routine stress ECG treadmill test or is adjunctive imaging (Nuclear or ECHO) needed?
If imaging needed, which one should be used? If pharmacological stress needed instead of
exercise, which agent to use?
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DOBUTAMINE
Activates beta receptor resulting in increased heart rate and myocardial oxygen demand
Works by inducing myocardial ischemia May be arrhythmogenic (0.7% rate in 8500
consecutive studies performed at Mayo Clinic) Usually ineffective in patients on beta blockers High rate of side effects Does not interact with dipyridamole
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Different Degrees of Coronary Blood Flow
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.04.5
mg/miin/g
Baseline Adeno Dipy Dobuta Exercise
Blood Flow
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ADENOSINE NUCLEAR STRESS TESTING
111
RESTING STATE
NORMAL CORONARYBLOOD FLOW PRESENTIN ABSENCE OF ANYSTENOTIC LESIONS
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ADENOSINE NUCLEAR STRESS TESTING
111
555
RESTING STATE ADENOSINE STRESS
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ADENOSINE NUCLEAR STRESS TESTING
111
5/5
5/55/5
RESTING STATE ADENOSINE STRESS
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ADENOSINE NUCLEAR STRESS TESTING
111
111
RESTING STATE ADENOSINE STRESS
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NORMAL ADENOSINE NUCLEAR SCAN
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ADENOSINE NUCLEAR DETECTION OF CORONARY ARTERY DISEASE
111
RESTING STATE
LOCAL VASODILATORS ARE RELEASED IN ANATTEMPT TO MAINTAINCORONARY BLOOD FLOW
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ADENOSINE NUCLEAR DETECTION OF CORONARY ARTERY DISEASE
111
525
RESTING STATE ADENOSINE STRESS
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ADENOSINE NUCLEAR DETECTION OF CORONARY ARTERY DISEASE
111
5/5
2/55/5
RESTING STATE ADENOSINE STRESS
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ADENOSINE NUCLEAR DETECTION OF CORONARY ARTERY DISEASE
111
10.41
RESTING STATE ADENOSINE STRESS
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ADENOSINE NUCLEAR DETECTION OF CORONARY ARTERY DISEASE
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ADENOSINE NUCLEAR DETECTION OF CORONARY ARTERY DISEASE
111
525
RESTING STATE ADENOSINE STRESS
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PATIENT EXAMPLE
62 year old male with history of tobacco abuse is admitted to the hospital with several episodes of chest pain. ECG shows non-specific STT abnormalities. Troponin value is 0.95 and creatinine is 3.2.
Telemetry shows occassional ventricular couplets. It is understood that cardiac catheterization carries high risk of permanent renal failure.
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ADENOSINE and THREE VESSEL DISEASE
111
RESTING STATE
LOCAL VASODILATORS ARE RELEASED IN ANATTEMPT TO MAINTAINCORONARY BLOOD FLOW
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ADENOSINE and THREE VESSEL DISEASE
111
222
RESTING STATE ADENOSINE STRESS
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ADENOSINE and THREE VESSEL DISEASE
111
2/2
2/22/2
RESTING STATE ADENOSINE STRESS
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ADENOSINE and THREE VESSEL DISEASE
111
111
RESTING STATE ADENOSINE STRESS
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FALSE NEGATIVE ADENOSINE NUCLEAR SCAN WITH THREE VESSEL DISEASE
RESTING STATE ADENOSINE STRESS
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FALSE NEGATIVE ADENOSINE NUCLEAR SCAN WITH THREE VESSEL DISEASE
111
111
RESTING STATE ADENOSINE STRESS
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Left Bundle Branch Block and Stress Testing
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Left Bundle Branch Block and Stress Testing
Abnormal septal motion is noted during stress echocardiography resulting in decreased accuracy in physician interpretation
Reversible defects of the septum are noted during exercise or dobutamine nuclear imaging resulting in increased false positives
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Left Bundle Branch Induced Septal Defect During Exercise Nuclear Test
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Left Bundle Branch Block and Stress Testing
Bottom line: Stress testing that does not increase heartrate (adenosine nuclear) is best for patients with Left Bundle Branch Block
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CONCLUSIONS
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Situations Where Treadmill ECG Sufficient
Whenever possible, perform exercise stress testing rather than pharmacological
If a patient can walk on treadmill (Bruce Protocol) for 6 minutes, has a normal ECG, and does not have diabetes, has not had a myocardial infarction or previous PCI or CABG, stress ECG testing can be performed without additional imaging modality
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Situations Where Nuclear Imaging Preferred Diabetics
Previous Myocardial Infarction
Reduced LV ejection fraction
Left Bundle Branch Block (with Adenosine)
Significant COPD
Hospitalized patient with positive enzymes
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Situations Where Stress ECHO Preferred Younger patients with lower likelihood of symptomatic
coronary artery disease
Pericardial Disease suspected
Valvular heart disease needs to also be evaluated
Need to evaluate for pulmonary hypertension
Exertional dyspnea is the predominant complaint
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Situations Where Stress ECHO and Nuclear Probably Equivalent
Coronary artery disease patients with preserved LV systolic function and without previous myocardial infarction or diabetes
Pre-operative Risk Assessment
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Adenosine is Preferred over Dobutamine except in the following situations
Echocardiography is chosen imaging modality and patient cannot exercise
Patient taking dipyridamole
Patient who cannot exercise and are prone to pulmonary bronchospasm
Patient with more than first degree heart block
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