detects spontaneous ventricular activity - the output of the pacemaker either is suppressed or discharged in order to make the impulse fall within the safe period of the QRS complex.
on demand systems are particularly useful in cases where AV conduction is likely to return (temporary pacing in acute myocardial infarction) and in patients with sinoatrial disorder or partial heart block.
unipolar systems (ventricular) are used in cases where AV conduction is likely to return.
in cases where there is normal AV conduction and a sino-atrial disorder then the pacing wire is situated in the right atrium.
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