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
How NCAP Affects Ventricular Timing
When an atrial pacing stimulus is delayed by the NCAP operation, the
pacemaker attempts to maintain a stable ventricular rate by shortening the
PAV interval that follows. It will not, however, shorten the PAV interval to
less than 80 ms. When a relatively high lower rate and long PVARP are
programmed, NCAP operation may result in ventricular pacing slightly
below the lower rate.
NCAP Operation
NCAP Availability
The Non-Competitive Atrial Pacing feature may be programmed ON/OFF
only in the DDDR mode. Its availability is further qualified as follows:
■
When Mode Switching is programmed ON, NCAP operations are
temporarily disabled if the pacemaker mode switches to the DDIR
mode. The NCAP feature is reenabled upon return to the DDDR mode.
■
Even when NCAP is programmed OFF, the NCAP operation is
invoked automatically for cycles on which PMT Intervention or
pacemaker-defined PVC operations occur (refer to “PMT Intervention”
later in this chapter).
14-6 Understanding Pacemaker Operations
Parameters:
Sensor-indicated Rate = 120 ppm (500 ms)
PAV Interval = 150 ms
PVARP = 230 ms
Post-Ventricular Atrial Blanking (PVAB) = 180 ms
Ventricular Refractory Period = 230 ms
200 ms
Act.
P
PP
DDDR
A
V
NCAP
P
R
Sensor-indicated
Interval
Sensor-indicated
Interval
Act.
P
NCAP
300 ms 80
ms
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