What is pericardial knock
- Pericardial knock is a loud high frequency diastolic sound produced by the abrupt halt in early diastolic filling due to the nondistensible pericardial shell overlying the heart
- Seen in constrictive pericarditis
- Diastolic high pitched sound
- 0.08-0.10 sec after S2
- Mistaken for Opening snap.
