Patent ID: 7873415

Claim:
A system configured to be coupled to a heart, the system comprising: an implantable cardiac rhythm management device including: a pacing output circuit configured to generate first electrical pulses at a first value for delivery to the heart; an evoked response sensing amplifier configured to sense a first evoked response and a second evoked response, the first and second evoked responses each evoked by one of the first electrical pulses at the first value; a depolarization circuit configured to receive from the evoked response sensing amplifier an amplified signal indicative of the sensed first and second evoked responses and detect a first cardiac depolarization and a second cardiac depolarization using the amplifier signal, the first and second cardiac depolarizations each occurring in direct reaction to the one of the first electrical pulses at the first value; and a pulse adjustment circuit coupled to the depolarization circuit and the pacing output circuit, the pulse adjustment circuit configured to adjust the first value to a value at which the first cardiac depolarization is detected and the second cardiac depolarization is not detected.