If the heart sound recording and ECG recordings are superimposed then the first heart sound would occur

At the P wave

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Just after the P wave

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Just before the QRS complex

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Just after the QRS complex

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D Just after the QRS complex
The QRS complex represents ventricular depolarisation, i.e., the start of ventricular contraction. Ventricular contraction causes the atrioventricular valves (i.e., the mitral and tricuspid valves) to close, producing the first heart sound. Therefore, the QRS complex of the ECG precedes the first heart sound slightly.
So, the correct answer is 'Just after the QRS complex'

Suggest Corrections