Why the study?
Is the onset of QRS earlier in anterior precordial ECG leads compared to lead II in subjects with normal hearts?
Population
84 subjects with clinically normal hearts from a defined population sample
Comparison
Measurement of QRS onset in anterior precordial… vs Measurement of QRS onset in lead II
Design
Cross-sectional
Authors
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Lead choice may affect QRS onset assessment; hypothesis-generating and should not yet change practice.
Is the onset of QRS earlier in anterior precordial ECG leads compared to lead II in subjects with normal hearts?
QRS onset occurs significantly earlier in anterior precordial leads V1 and V2 compared to lead II, though measurement precision is limited by baseline oscillations.
Danzig et al. (1976) studied this question.
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