Chronic stable angina exercise echocardiography
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Chronic stable angina exercise echocardiography On the Web
Stress echocardiography is echocardiography that is paired with different forms of stressors, such as exercise or pharmacological. Exercise stress echocardiography is the preferred stress echocardiography modality. However, it is not suitable for all patients and may not be feasible in populations that do not meet a minimum level of fitness. In patients who are ineligible for exercise stress echocardiography, pharmacological stress echocardiography can be a useful alternative. Common pharmacological stressors include: adenosine, dipyridamole, and dobutamine. As a testing modality, exercise echocardiography is noted as more sensitive, more specific and has a higher predictive value than exercise ECG. Exercise echocardiography can be helpful in the evaluation of regional wall motion response, location and extent of ischemia during stress in patients with MI. During exercise, the normal myocardium is hyperdynamic while in patients with MI, the ischemic myocardium is either akinetic or hypokinetic.
Advantages of Stress Echocardiography
- Aids in detection of coronary artery disease (CAD).
- In patients with known or suspected CAD, stress echocardiography can assess the prognosis of CAD.
- Stress echocardiography is noted as a specific testing modality for the assessment of myocardial viability after acute MI.
- In patients with chronic ischemic LV dysfunction, stress echocardiography can assist in prediction of full functional recovery of the myocardium after revascularisation.
- The capability of stress echocardiography to detect ischemia earlier in the ischemic cascade has been greatly improved with the advent of tissue Doppler imaging and strain rate imaging.
- Tissue Doppler imaging is useful in the quantification of myocardial wall motion and strain.
- Strain rate imaging is useful to determine regional deformation where strain can be defined as the difference per unit length.
- Signs suggestive of severe CAD on exercise echocardiography include:
- Reduction on global systolic function
- LV dilation,
- New or progressively worsening mitral regurgitation (MR)
Sensitivity and Specificity
- Exercise echocardiography has been reported to have a sensitivity between 74% to 100%.
- The specificity has been reported to be between 64% to 93% for detecting CAD.
- In one meta-analysis, the sensitivity of exercise echocardiography was between 80-85%. Specificity was reported between 84-86%.
- A good level of agreement has also been reported between stress echocardiography and stress scintigraphy.
- With the use of high dose of dobutamine (up to 50 gm/kg/min), a method of dobutamine stress echocardiography can be performed with 86% to 96% of sensitivity and 66% to 95% of specificity.
- Lower doses of dobutamine can also be used to detect hibernating myocardium. Areas of hibernating myocardium exhibit poor or absent contraction at rest but normal contraction during dobutamine infusion. By comparison, areas damaged by myocardial infarction or fibrosis exhibit no improvement with dobutamine.
For more information on exercise/pharmacologic stress echocardiography, click here.
For more information on comparison of exercise SPECT imaging and exercise echocardiography, click here.
ACC/AHA/ACP–ASIM Guidelines for the Management of Patients With Chronic Stable Angina (DO NOT EDIT)
Cardiac Stress Imaging as the Initial Test for Diagnosis in Patients With Chronic Stable Angina Who Are Able to Exercise (DO NOT EDIT)
|"1. Exercise stress with nuclear MPI or echocardiography is recommended for patients with an intermediate to high pretest probability of IHD who have an uninterpretable ECG and at least moderate physical functioning or no disabling comorbidity (Level of Evidence: B)"|
|"1. Exercise stress with nuclear MPI or echocardiography is reasonable for patients with an intermediate to high pretest probability of obstructive IHD who have an interpretable ECG and at least moderate physical functioning or no disabling comorbidity.(Level of Evidence: B)"|
|"1. For patients with a low pretest probability of obstructive IHD who do require testing, standard exercise stress echocardiography might be reasonable, provided the patient has an interpretable ECG and at least moderate physical functioning or no disabling comorbidity.(Level of Evidence: C)"|
|"1. Pharmacological stress with nuclear MPI, echocardiography, or CMR is not recommended for patients who have an interpretable ECG and at least moderate physical functioning or no disabling comorbidity.(Level of Evidence: C)"|
ACC/AHA/ACP–ASIM Guidelines for the Management of Patients With Chronic Stable Angina (DO NOT EDIT)
Cardiac Stress Imaging as the Initial Test for Diagnosis in Patients With Chronic Stable Angina Who Are Unable to Exercise (DO NOT EDIT)
|"1. Adenosine or dipyridamole myocardial perfusion imaging or dobutamine echocardiography in patients with an intermediate pretest probability of CAD. (Level of Evidence: B)"|
|"2. Adenosine or dipyridamole stress myocardial perfusion imaging or dobutamine echocardiography in patients with prior revascularization (either PTCA or CABG). (Level of Evidence: B)"|
|"1. Adenosine or dipyridamole stress myocardial perfusion imaging or dobutamine echocardiography in patients with a low or high probability of CAD in the absence of electronically paced ventricular rhythm or left bundle-branch block. (Level of Evidence: B)"|
|"2. Adenosine or dipyridamole myocardial perfusion imaging in patients with a low or high probability of CAD and 1 of the following baseline ECG abnormalities:|
|a. Electronically paced ventricular rhythm. (Level of Evidence: C)|
|b. Left bundle-branch block. (Level of Evidence: B)"|
ESC Guidelines- Exercise Stress with Imaging Techniques (either Echocardiography or Perfusion) in the Initial Diagnostic Assessment of Angina (DO NOT EDIT)
|"1. Patients with resting ECG abnormalities, LBBB, more than 1 mm ST depression, paced rhythm, or WPW which prevent accurate interpretation of ECG changes during stress. (Level of Evidence: B)"|
|"2. Patients with a non-conclusive exercise ECG but reasonable exercise tolerance, who do not have a high probability of signiﬁcant coronary artery disease and in whom the diagnosis is still in doubt. (Level of Evidence: B)"|
|"1. Patients with prior revascularization (PCI or CABG) in whom localization of ischaemia is important. (Level of Evidence: B)"|
|"2. As an alternative to exercise ECG in patients where facilities, cost, and personnel resources allow. (Level of Evidence: B)"|
|"3. As an alternative to exercise ECG in patients with a low pre-test probability of disease such as women with atypical chest pain. (Level of Evidence: B)"|
|"4. To assess functional severity of intermediate lesions on coronary arteriography. (Level of Evidence: C)"|
|"5. To localize ischaemia when planning revascularization options in patients who have already had arteriography. (Level of Evidence: B)"|
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