Medtronic PROTECTA XT DR D314DRG, Руководство для клиницистов

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Figure 147. FVT via VT detection parameters
The device detects a tachyarrhythmia episode when the number of consecutive VT or FVT
events reaches the programmed Initial Beats to Detect value for VT. At this point, if any of
the 8 most recent intervals have occurred in the FVT zone, the device detects an FVT
episode. If all of the 8 most recent intervals are longer than the FVT detection interval, the
device detects a VT episode.
8.2.2.4 Detecting a VT in the VF zone
An FVT detection zone may also be used to detect and treat a VT episode that is in the VF
zone. This approach may help to ensure reliable detection of VF, while providing the ability
to deliver a less aggressive therapy such as antitachycardia pacing for the patient’s fast VT.
To detect a VT in the VF zone, program FVT Detection to via VF and select a V. Interval
(Rate) value for FVT. To help ensure that the patient’s fast ventricular tachycardia is
classified as FVT, select a value that matches the shortest ventricular interval that typically
occurs during the patient’s fast VT.
Figure 148. FVT via VF detection parameters
The device detects a tachyarrhythmia episode when the number of recent VF or FVT events
reaches the programmed Initial Beats to Detect value for VF. At this point, if all of the 8 most
recent intervals were classified as FVT events, the device detects an FVT episode. If 1 or
more of the 8 most recent intervals were classified as VF events, the device detects a VF
episode.
Medtronic PROTECTA™ XT DR D314DRG
Clinician Manual 309