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S wave
The 1st positive deflection following an R wave in the QRS complex.
Related
ECG QRS complex
electrocardiogram (ECG, EKG)
R wave
General
electrocardiogram feature
References
Practial ECG Interpretation, Basic Electrocardiography &
Cardiac Arrhythmias, T. Evans, M.D., UCSF, Ring Montain Press,
1998