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McGill Case 148: Difference between revisions
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[[File:E0003148.jpg|thumb|600px|left|.]] | [[File:E0003148.jpg|thumb|600px|left|This is an EKG rhythm and marker strip from a patient with a Medtronic model 7108 Minuet dual chamber pacemaker. The patient had intact A/V conduction, and with a long paced A/V interval, conducted paced atrial beats to the ventricle. | ||
The atrial pacing threshold was determined by pacing at a rate faster than the patient's own rate and decreasing the atrial pulse width until atrial capture was lost, and ventricular pacing occurred (the upper tracing). | |||
In spite of returning the atrial pulse width back to the last successful value, ventricular pacing continued . | |||
Slowing the pacing rate terminated ventricular pacing (the lower tracing) and ventricular pacing did not return when the pacing rate was speeded up again.]] | |||