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 (S3). An implantable sensor such as an accelerometer or a microphone senses an acoustic signal indicative heart sounds including the second heart sounds (S2) and S3. The heart sound detector detects occurrences of S2 and starts S3 detection windows each after a predetermined delay after a detected occurrence of S2. The occurrences of S3 are then detected from the acoustic signal within the S3 detection windows.

主权项

1. A system for detecting heart sounds from an acoustic signal indicative of heart sounds including first heart sounds (S1), second heart sounds (S2), and third heart sounds (S3), the system comprising:
an S3 detector configured to receive the acoustic signal, an S3 threshold, and S3 windows and detect S3 using the acoustic signal and the S3 threshold during the S3 windows; a measurement module configured to receive the acoustic signal and detect an acoustic energy using the acoustic signal, the acoustic energy being a total acoustic energy of the acoustic signal over a specified time interval; and an S3 threshold generator configured to normalize the S3 threshold using the detected acoustic energy.