OSYPKA PACE 203H, Инструкция по эксплуатации, Страница: 32 / 139

PACE 203H – Instructions for Use
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val, initiated by a sensed or paced ven-
tricular event. Known also as the Atrial
Escape Interval, it is the interval from a
sensed or paced ventricular event to an
atrial paced event. Every cycle, the V-A
delay is calculated as the difference
between the set beat-to-beat interval and
the A-V interval.
Atrial triggering
means that a detected
P-wave causes an atrial stimulus. The
programmable options for atrial trigger-
ing are OFF or ON.
The
blanking period
is defined as the
time during and after a sensed or paced
event when the sensing channel and/or
the opposite channel of an
atrioventricular pacemaker are insensi-
tive. The purpose is to avoid sensing of
late potentials and sensing the event of
one channel in the opposite channel
(crosstalk). Thus, during the blanking
period, no events are recognized.
Refractory period
is a set time in the
pacemaker, in which a signal in the re-
spective channel will be recognized but
not tracked or does not cause inhibition.
Sensing phase
is the period of time in
which a signal that occurred in the re-
spective channel will be recognized,
interpreted as intrinsic, and tracked.
Thus, this is the period outside blanking
or refractory periods.
The
post-ventricular atrial refractory
period
, or
PVARP
(a pacemaker pa-
rameter), is the period after a sensed or
paced ventricular event during which the
atrial sensing circuit is refractory. Thus,
any atrial event occurring during PVARP
will not be sensed by the atrial sensing
circuit. In biventricular stimulation the
PVARP starts after the second ventricu-
lar stimulus.
9.6.1 Ventricular Asynchronous (V00)
Pacing
Ventricular asynchronous (V00) pacing
is the simplest of all pacing modes be-
cause there is no sensing and no mode
of response. The ventricular pacing
stimuli occur at the programmed rate,
regardless of any intrinsic cardiac event.
9.6.2 Atrial Asynchronous (A00)
Pacing
Atrial asynchronous (A00) pacing be-
haves exactly like V00, but the pacing
stimuli occur in the atrium. The atrial
pacing stimuli occur at the programmed
rate, regardless of any intrinsic cardiac
event.
9.6.3 A-V Sequential Asynchronous
(D00) Pacing
Dual-chamber, or A-V sequential asyn-
chronous (D00) pacing provides atrial
and subsequent ventricular stimuli with a
fixed, programmed delay. The pacing
stimuli occur at the programmed rate,
regardless of any intrinsic atrial or ven-
tricular events.
9.6.4 Ventricular Inhibited (VVI) Pac-
ing
Ventricular inhibited (VVI) pacing incor-
porates sensing on the ventricular chan-
nel, and pacemaker output is inhibited by
a sensed ventricular event. In VVI mode,
PACE 203H is refractory for a period
after a paced or sensed ventricular
event, the ventricular refractory period.
Any ventricular event occurring within
the ventricular refractory period is not
sensed. Any ventricular event occurring
outside the ventricular refractory period
is sensed and resets the timing of the