Specifications

7 x 9 inches (178 mm x 229 mm)
Medtronic Confidential
Refer to the “Reference man.” category in doc#163256 for Printing
Instructions.
196407001 Rev A
DDD Mode Operation
The DDD mode provides atrial synchronous pacing in the presence of
intrinsic atrial activity; otherwise, AV sequential pacing occurs at the
Lower Rate. Each atrial paced or nonrefractory atrial sensed event starts an
AV interval and a Lower Rate interval. The AV intervals that follow sensed
atrial events (SAV) and paced atrial events (PAV) are separately
programmable, and the SAV may be optionally programmed to shorten
with increasing rate (Rate Adaptive AV). Ventricular paced events may
track atrial sensed events up to the programmed Upper Tracking Rate.
4
A ventricular nonrefractory sensed event in the VA interval that is not
preceded by an atrial sense (AS or AR) may be a pacemaker-defined PVC,
and starts a new VA interval.
Example of DDD Mode Operation.
4
The Total Atrial Refractory Period (TARP) may limit the tracking rate to a lesser value.
Pacing Modes 10-11
V
P
V
S
V
S
A
P
A
S
A
P
Lower Rate Interval Lower Rate Interval
Parameters:
Lower Rate = 60 ppm (1000 ms) PAV Interval = 200 ms
SAV Interval = 170 ms
200 ms
A
P
9879EN-10_9501043EN/CTC.qxd 5/10/99 11:25 Page 10-11