Method and apparatus for identifying cardiac risk

摘要

A cardiac-based metric is computed based upon characteristics of a subject's cardiac function. In accordance with one or more embodiments, the end of a mechanical systole is identified for each of a plurality of cardiac cycles of a subject, based upon an acoustical vibration associated with closure of an aortic valve during the cardiac cycle. The end of an electrical systole of an electrocardiogram (ECG) signal for each cardiac cycle is also identified. A cardiac-based metric is computed, based upon a time difference between the end of the electrical systole and the end of the mechanical systole, for the respective cardiac cycles.

主权项

1. A method comprising:
identifying a plurality of cardiac cycles in an electrical signal representative of an electrocardiogram (ECG) from a subject; for each of the plurality of cardiac cycles,
identifying T-wave offset of the ECG, andidentifying a segment of an acoustical vibration representative of heart sounds from the subject, based upon a T-wave offset time of a corresponding ECG synchronized with the heart sounds; constructing an array of the identified segments from each of the plurality of cycles; computing heart sound and noise components of the acoustical vibration using blind source separation; and detecting the presence of a heart sound based upon energy in the heart sound components and the noise components.