St. Jude Medical Merlin PSA EX3100, Help Manual

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Merlin™ PSA Help Manual 8-1
8. Mode Descriptions
The Merlin™ PSA may be programmed to the following operating modes.
DDD
(Dual-Chamber Pacing, Sensing, and Inhibition; Atrial Tracking)
The DDD Mode is a dual-chamber, atrial-based timing mode in which increases or decreases in the
sensed atrial rate are duplicated by similar changes in the ventricular rate. Sensed P-waves or R-waves
inhibit output pulses, while no intrinsic activity during the alert periods result in delivered pulses.
Figure 8-1. DDD Mode timing diagram
Dual-Chamber Atrial Ventricular Off Modes
DDD AAI VVI ODO
DDI AOO VOO
DOO
VDD
Table 8-1. Available Modes
Refractory Period
Blanking Period
Alert Period AV Delay
Output Pulse
Sensed Event PVARP
A
V
Programmed Rate
AP
VS VS VP VP
AS AS AP