User's Manual

Cardiac Airbag Technical Manual 31
2.5 Bradycardia Therapy
The Cardiac Airbag ICDs have programmable bradycardia and
post-shock bradycardia pacing functions. The post-shock
bradycardia parameters are preset to a higher rate and output
values following a delivered shock, without compromising the
who require chronic bradycardia
basic rate timer is initiated by a sensed or paced event. A
ensed event outside of the refrac
resets the lower rate timer. In the absence a
pacin will be delivered at the end of the lower rate
interva e OFF disabl dyc
tachycardia sensing and therapy may remain active.
” in its designation is a rate
functionally the same as the
ptive mode; except that the pacing
ation
Cardiac Airbag / Cardiac Airbag-T ICDs allow the selection of a
rate responsive pacing mode (VVIR). This mode allows the
ICDs bradycardia therapy function to adapt the pacing rate to
increasing or decreasing patient activity, based on data collected
from a motion sensor within the ICD. Separate criteria controls
the rate of increase and decrease of pacing, as well as the
sensitivity of the sensors.
longevity of the ICD for patients
pacing. The post-shock values are presented in the following
subsections after the chronic bradycardia support values.
2.5.1 Bradycardia Pacing Modes
The bradycardia pacing mode may be programmed to VVI or
VVIR for bradycardia pacing support or to OFF (OVO). The
s tory period inhibits pacing and
of a sensed event,
ardia pacing; however
g pulse
l. Th mode es bra
The mode that contains an “R
adaptive mode. This mode is
corresponding non-rate ada
rate will be automatically adjusted to take into account the
current load on the patient’s heart in response to increased
physical activity.
2.5.2 Basic Rate
The basic rate is the rate at which bradycardia pacing will occur
in the absence of a patient’s intrinsic rhythm. This rate may be
individually programmed for normal bradycardia pacing.
2.5.3 Rate Adapt