Quantitative and qualitative analysis of the relationship between exercise-induced R wave amplitude changes and...

Area of Science:

• Cardiology
• Medical Diagnostics

Background:

• Electrocardiographic (ECG) changes, specifically R wave voltage variations (delta R), are used to assess cardiac function.
• The relationship between delta R and the severity of coronary artery disease (CAD) during exercise stress testing requires further clarification.

Purpose of the Study:

• To evaluate the correlation between R wave voltage variations and the angiographic severity of coronary artery disease (CAD) at different heart rate (HR) levels.
• To determine if delta R can reliably indicate CAD severity during stress testing.

Main Methods:

• A study involving 195 patients categorized into no CAD (OV), single-vessel disease (SVD), double-vessel disease (DVD), and triple-vessel disease (TVD) groups.
• Progressively increasing heart rate (HR) steps during stress testing while monitoring R wave voltage variations (delta R).
• Correlation analysis between delta R measurements and angiographic CAD severity.

Main Results:

• Delta R sensitivity was higher in DVD and TVD patients compared to SVD patients at the end of stress.
• No clear correlation was observed between exercise-induced R wave changes and angiographic CAD severity across the study population.
• Similar delta R changes were noted across a wide range of HRs, irrespective of CAD severity.

Conclusions:

• The observed correlation between delta R and CAD severity at the end of stress testing may be artifactual.
• Different exercise tolerance levels in patients with SVD, DVD, and TVD might influence the interpretation of delta R.
• R wave voltage variations alone may not be a definitive marker for CAD severity during stress testing.