IMPLANTABLE MEDICAL DEVICE WITH ACTIVE DETECTION OF ATRIAL MECHANICAL ACTIVITY

摘要

A device includes a lead configured to for use in applying an atrioventricular delay (“AVD”), an acceleration sensor adapted to output an endocardial acceleration signal, and circuitry configured to receive and process said endocardial acceleration signal to provide ventricular pacing by varying, in a controlled manner, the AVD in a range having a plurality of AVD values. The circuitry derives from said endocardial acceleration signal a value of a parameter representative of an component of the endocardial acceleration signal corresponding to the first endocardial acceleration peak associated with an isovolumetric ventricular contraction (“EAX component”), and evaluates a degree of variation of said parameter values as a function of said plurality of AVD values to detect atrial and ventricular events.

主权项

1. A method for detecting atrial and ventricular events comprising:
receiving a first endocardial acceleration signal corresponding to a first range of atrioventricular delay values during ventricular pacing; receiving a second endocardial acceleration signal corresponding to a second range of atrioventricular delay values during ventricular pacing; deriving from the first endocardial acceleration signal a first parameter representative of a component of the first endocardial acceleration signal, the first parameter derived from the first range of atrioventricular delay values; deriving from the second endocardial acceleration signal a second parameter representative of a component of the second endocardial acceleration signal, the second parameter derived from the second range of atrioventricular delay values; evaluating a degree of variation in the first and second parameters by calculating a difference between the first and second parameters; and discriminating between normal atrial mechanical activity and absent or deficient atrial mechanical activity using the difference between the first and second parameters.