|1. A system comprising:
an external accelerometer configured to generate an acceleration signal indicative of chest wall motion of a patient; and
a processor configured to integrate the acceleration signal to generate a velocity signal, receive an electrical cardiac signal
indicative of electrical cardiac activity of the patient, temporally correlate the velocity signal with the electrical cardiac
signal, determine a time delay between a deflection of the electrical cardiac signal indicative of electrical activation of
a ventricle of a heart of the patient and a subsequent greatest peak of the velocity signal, and generate an output indicative
of a cardiac dyssynchrony status of the patient based on the time delay.