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
DDDR Mode Operation
In the DDDR mode, the pacemaker tracks the faster of the intrinsic atrial
rate or the sensor-indicated rate. If the intrinsic rate is faster, the DDDR
mode provides atrial synchronous pacing; otherwise, AV sequential pacing
occurs at the sensor-indicated rate. Rate limits for atrial tracking (Upper
Tracking Rate)
4
and sensor tracking (Upper Activity Rate) are separately
programmable. The AV intervals that follow sensed atrial events (SAV)
and paced atrial events (PAV) are separately programmable, and they can
be programmed to shorten with increasing rates (Rate Adaptive AV).
A nonrefractory sensed event in either chamber inhibits pacing in that
chamber. 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 DDDR Mode Operation.
4
The Total Atrial Refractory Period (TARP) may limit the tracking rate to a lesser value.
Pacing Modes 10-9
V
P
V
S
V
S
V
P
A
P
A
S
A
P
Sensor-indicated
Interval
Sensor-indicated
Interval
Parameters:
Lower Rate = 60 ppm (1000 ms)
Sensor-indicated Rate = 90 ppm (667 ms)
PAV Interval = 200 ms
SAV Interval = 170 ms
200 ms
A
P
A
S
V
P
PVARP = 280 ms
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