Method and apparatus for third heart sound detection

摘要

A cardiac rhythm management system includes a heart sound detector providing for detection of the third heart sounds (S 3 ). An implantable sensor such as an accelerometer or a microphone senses an acoustic signal indicative heart sounds including the second heart sounds (S 2 ) and S 3 . The heart sound detector detects occurrences of S 2 and starts S 3 detection windows each after a predetermined delay after a detected occurrence of S 2 . The occurrences of S 3 are then detected from the acoustic signal within the S 3 detection windows.