Patent ID: 8676304

Claim:
A cardiac monitoring device configured to analyze electrical signals from the heart to detect ischemic events, including: at least one sensor designed to collect the electrical signal from the heart; electrical circuitry coupled to the sensor and configured to amplify and digitize the electrical signal to produce sensed data; memory storage coupled to the electrical circuitry to store the sensed data; a processor configured to: analyze the sensed data in the memory storage; based on the sensed data, distinguish between sinus beats, left bundle branch block beats and other types of beats, and measure at least one feature of beats associated with sinus beats and left bundle branch block beats during a predetermined time interval, respectively; and detect the presence or absence of an ischemic event by applying a first ischemia detection criterion to the sinus beat measured feature and a second ischemia detection criterion to the left bundle branch block measured feature dependent upon a number of sinus beats and left bundle branch block beats during said predetermined time interval; wherein (1) when said number of left bundle branch block beats are less than a first threshold value, then apply said first ischemia detection criterion to said sinus beat measured feature, (2) when said number of left bundle branch block beats are greater than a second threshold value, then apply said second ischemia detection criterion to said left bundle branch block measured feature, and (3) when said number of left bundle branch block beats and said sinus beats are greater than a third threshold value, respectively then apply said first and second ischemic detection criteria to both said left bundle branch block measured feature and said sinus beat measured feature.