OSYPKA PACE 203H, Instructions For Use Manual

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PACE 203H – Instructions for Use
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9.22.5.3 Absolute and relative PVARP
If the patient’s heart is beating at a
relatively high intrinsic rate, an extended
PVARP could have the consequence
that after the recognition of a single
extrasystole, subsequent extrasystoles
are determined only because within the
atrial channel, the PVARP takes up most
of the V-A delay.
PACE 203H avoids this effect by dividing
the PVARP in two periods, the absolute
PVARP and the relative PVARP. Within
the absolute PVARP (90 ms), no atrial
events are sensed. Within the relative
PVARP (equals the remaining 400 ms),
atrial events are sensed, but not tracked
by the ventricular channel. Thus, PACE
203H interprets a ventricular sensed
event following an intrinsic atrial event
within the relative PVARP, as a regular
beat and not as an extrasystole
As a consequence, ventricular respon-
ses caused by premature atrial contra-
ctions are not counted as extrasystoles.
9.22.6 Runaway Protection
PACE 203H can stimulate the heart with
a maximum basic rate of 220 ppm or a
maximum tracking rate (MTR) of 230
ppm. The output of higher stimulation
rates, for example due to a defect in the
frequency generator, is limited by an
independent safety function, to a
maximum of 238 ppm. This safety func-
tion is referred to as runaway protection.
9.22.7 Protection Against Abnormal
Settings
PACE 203H continuously monitors the
setting of parameters so that abnormal
settings, as shown in Table 60, can be
detected and avoided. Such settings can
cause danger for the patient.
Note
: All conflicts are avoided, when
"Auto A-V Delay", "Auto PVARP" and
"Auto MTR" are activated (see chapter
9.9).
Note
: The protection against abnormal
settings (warning and limitation) can be
turned off using the "Alarms on/off"
option (see 9.12.5.2). If Alarms are off, it
is the responsibility of the user to set
appropriate parameter combinations.