Determination of agreement between cardiopulmonary and standard ECG stress testing in coronary artery disease

Area of Science:

• Cardiology
• Exercise Physiology
• Diagnostic Testing

Background:

• Standard electrocardiogram (ECG) (CX) and cardiopulmonary (CPX) exercise stress tests are used to evaluate patients with coronary artery disease (CAD).
• The comparability of results between these two testing modalities, particularly in patients not on cardioactive therapy, requires investigation.

Purpose of the Study:

• To evaluate the agreement between standard ECG (CX) and cardiopulmonary (CPX) exercise stress tests in patients with known CAD.
• To assess the influence of gas exchange analysis techniques on exercise test reproducibility and interpretation in CAD.

Main Methods:

• Forty patients with known CAD, not on cardioactive therapy, underwent both CX and CPX tests in a randomized sequence.
• Analysis included systolic blood pressure, heart rate, exercise time, rate-pressure product, and blood lactate kinetics.

Main Results:

• Systolic blood pressure and heart rate were higher during CPX at low workloads (<100 W).
• Exercise time and rate-pressure product showed high variability (>20%) but no significant difference between tests.
• Blood lactate kinetics demonstrated high reproducibility between CX and CPX tests.

Conclusions:

• The provocative role of exercise testing in CAD patients is not altered by the gas exchange analysis technique.
• Common indices of myocardial and global physical performance may be influenced by the testing method.
• Caution is advised when comparing CX or CPX data with reference values or results from the other test modality.