Electrocardiogram Lead Placement Accuracy and Its Implications on Universal Screening in Athletes

Area of Science:

• Sports Cardiology
• Medical Imaging
• Physiology

Background:

• Athlete electrocardiograms (ECGs) often show abnormalities due to training adaptations.
• Inter-individual ECG variability is influenced by body morphology and lead placement.
• Standard lead placement uses bony landmarks, which may not align with the true cardiac silhouette.

Purpose of the Study:

• To compare ECG lead placement using cardiac silhouette versus standard bony landmarks in athletes.
• To assess the impact of cardiac-based lead placement on ECG interpretation in athletes.

Main Methods:

• Prospective study of 40 male NCAA Division I athletes.
• Measured chest dimensions and performed ECGs with standard bony landmarks.
• Used cardiac ultrasound to guide precordial lead placement (V2, V4) to the cardiac silhouette.
• Performed a second ECG with cardiac-based lead placement.

Main Results:

• Significant average distances (29.8 mm for V2, 58 mm for V4) between bony and cardiac-based lead positions.
• Consistent and significant differences in R, S, T wave, and ST segment amplitudes in leads V2-V4.
• Cardiac-based lead placement did not reveal new abnormalities or alter existing ones on ECGs.

Conclusions:

• ECG lead measurements differ statistically between cardiac silhouette and bony landmarks.
• Despite differences, lead placement based on cardiac anatomy does not yield clinically significant alterations in ECG interpretation.
• The study does not support using the cardiac silhouette over bony landmarks for ECG lead placement in athletic screenings.