A method for acquiring cardiac information from a patient having a pacer
for pacing a heart rhythm, an abnormal EKG, or an abnormal heartbeat is
disclosed. The method includes: placing a signal injection device
proximate the pacer of the patient and injecting a signal across a skin
barrier of the patient toward the pacer; in response to the signal
received at the pacer, pacing the patient's heart in a fixed asynchronous
pacing mode; and, acquiring cardiac information relating to the patient's
fixed asynchronously paced heart.