Filter
Top Products
78 Stratos LV/LV-T Technical Manual
2.3.8 Ventricular Refractory Period
In all modes in which a ventricular depolarization can be sensed,
the Stratos CRT-Ps begin a ventricular refractory period after
each ventricular event, using a standard value of 250 ms
(programmable as 150…(35)…500 ms).
2.3.9 AV Delay
2.3.9.1 Dynamic AV Delay
Programmable values
Lower AV limit:
Nominal value: 60 ppm, (30…(10)…180 ppm)
Upper AV limit:
Nominal value: 130 ppm, (30…(10)…180 ppm)
AV Interval Length for Low Rate:
Standard value: 150 ms (programmable 15… (5) …300 ms)
The AV delay defines the interval between an atrial paced or
sensed event and the ventricular pacing pulse. The AV delay
can be dynamically programmed in DDD(R), DDT(R)A and
VDD(R) modes. In all other mode the AV delay is a fixed value.
If the CRT-P is programmed to a dual chamber sensing mode,
an intrinsic ventricular event falling within the AV delay will inhibit
the ventricular pacing pulse. If not contraindicated, a longer AV
delay can be selected to increase the probability of ventricular
output pulse inhibition. Short AV delays are available for testing
purposes or if ventricular pre-excitation is desired (i.e.,
hemodynamic considerations). When the dynamic AV delays
are programmed, the dynamics are calculated from the
difference between two atrial sense events (As or Ap).
Dynamic AV Delay provides independent selection of AV Delays
from five rate ranges at pre-set AV Delay values. In addition, the
AV Delay after atrial pace events can be differentiated from the
AV interval after atrial sense events for dual chamber pacing
modes.