St. Jude Medical Merlin PSA EX3100, Help Manual

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Merlin™ PSA Help Manual 8-5
Figure 8-6. VOO Mode timing diagram
AAI
(Atrial Pacing, Sensing, and Inhibition)
In AAI mode, the device paces the atrium at the programmed rate if the atrial events are not sensed. If
the device detects a sensed event during the alert period, it withholds the pulse and resets the timing
to the start of the Atrial Refractory Period.
Figure 8-7. AAI Mode timing diagram
AOO
(Atrial Asynchronous Pacing)
In AOO mode, the device paces the atrium at the programmed rate regardless of intrinsic rhythm.
Output Pulse
Programmed Rate Programmed Rate
VP VP VP
Output Pulse Refractory Period
Alert Period
Programmed Rate
Sensed Event
AP AP AS