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How to determine the timing of a thrill ?

While palpating for a thrill, you should always put your left thumb over the right carotid artery at the level of upper border of thyroid cartilage  to confirm the timing of thrill .
If the thrill is synchronous with carotid pulsation it is systolic
Thrill occuring before the carotid pulsation is diastolic
Timing can also be done comparing thrill with apex beat
Always remember :
In mitral or apical area — Diastolic thrill is very common.
In all other areas (base of the heart and tricuspid area) — Systolic thrill is more common.
In pulmonary area — Thrill may be continuous or systolo-diaslolic. eg. PDA.