An exemplary method includes introducing current between a first pair of electrodes configured for placement internally in a patient, triggering a potential measurement between a second pair of electrodes configured for placement internally in a patient wherein communication of a signal through the patient allows for proper triggering, measuring potential between the second pair of electrodes and, based at least in part on the measuring and the introducing, determining a cardiac condition. Other exemplary methods, devices, systems, etc., are also disclosed.

 
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