Mintek LV, LV-T 2.3.8 Ventricular Refractory Period, 2.3.9 AV Delay, Lower AV limit:, Upper AV limit:, Programmable values, 2.3.9.1Dynamic AV Delay

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

2.3.9.1Dynamic 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.