Patent ID: 8275456

Claim:
An implantable cardiac device, comprising: a sense amplifier for receiving an electrogram signal from an electrode; circuitry for storing a reference electrogram; circuitry configured to record an electrogram received by the sense amplifier and to detect a change in the recorded electrogram indicative of cardiac ischemia by comparing the recorded electrogram with the reference electrogram, wherein the circuitry is further configured to perform the comparison by passing the recorded electrogram through a matched filter that cross-correlates the recorded electrogram with the reference electrogram; a minute ventilation sensor for measuring a patient's respiratory rate; a drug delivery apparatus for delivering a quantity of a cardiac drug; and, circuitry configured to actuate the drug delivery apparatus and further configured to initiate drug delivery only if both of the following conditions are met: 1) cardiac ischemia is detected from the recorded electrogram, and 2) the measured respiratory rate is above a specified threshold.