7 doctors weighed in:
What do the letters qrs mean on the the electrocardiogram?
7 doctors weighed in

Dr. Bart Denys
Internal Medicine - Cardiology
6 doctors agree
In brief: ECG QRS
Q is a downward deflection on the ecg, r is an upward deflection and s a downward one.
The trio, qrs, represents the electrical activity ov ventricular contraction on the electrocardiogram.

In brief: ECG QRS
Q is a downward deflection on the ecg, r is an upward deflection and s a downward one.
The trio, qrs, represents the electrical activity ov ventricular contraction on the electrocardiogram.
Dr. Bart Denys
Dr. Bart Denys
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