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PACE 203H – Instructions for Use
5I-17-016X-B-20
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user’s confirmation, but continues to
display the open lead symbol if the mal-
function remains present.
If the disconnection is detected when the
lower display is switched off, only the
acoustic signal is enabled. A first press
of the key
Unlock/Lock
switches on the
lower display and the backlight, and un-
locks the device. Then, the warning
message is displayed. A second press
on the key
Unlock/Lock
confirms the
error message.
If the disconnection is detected when the
lower display is switched on, but the de-
vice is locked, a first press of the key
Unlock / Lock
switches the backlight on,
and unlocks the device. The user con-
firms the warning message with a
second press of the key
Unlock/Lock
.
Once the leads are connected and func-
tioning appropriately, the lead-breakage
warning function is enabled automati-
cally after three sensed or paced events.
Note
: As long as the stimulation ampli-
tude is set to less than 2.0 V, or the
pulse duration is set less than 0.15 ms,
the lead-breakage surveillance remains
in the previously held status (enabled or
disabled).
When PACE 203H resumes operation
from the stand-by mode, the lead-break-
age surveillance is always activated.
PACE 203H assumes that the pace-
maker is already connected to the pac-
ing leads and thus, to the patient. In any
other case of beginning operation, PACE
203H first disables the lead-breakage
surveillance. Thus, the user is able to set
up the patient without being bothered by
lead-breakage warnings, while the pace-
maker is not connected to the pacing
leads. However, upon proper connection
of PACE 203H to the pacing leads and,
thus, the patient, PACE 203H enables
lead-breakage surveillance after three
successfully sensed or paced events.
Note:
The lead surveillance can be tur-
ned off using the Alarms on/off option
(see Chapter 9.12.5.2). However, it is
not recommended to disable the lead
surveillance function.
Warning
: The lead surveillance function
should only be disabled if a medical pro-
fessional continuously monitors the
patient.
9.22.3 Interference and Mode
Switching
PACE 203H is designed for optimal
sensing characteristics and filtering
suppression of possible noise and inter-
ference of frequencies beyond the range
of intrinsic and paced frequencies. How-
ever, there are types of interference
whose frequencies hardly differ from
those of intracardiac signals (for exam-
ple, noise from mains supply and strong
muscle potentials), and are of such mag-
nitude that complete suppression cannot
be achieved.
As a consequence, PACE 203H imple-
ments an algorithm, which decides, by
means of a rate analysis of the observed
signal, whether the intrinsic events or
interference is sensed:
Signals with a frequency below 270 ppm
(about 4.5 Hz) will be judged as intrinsic
heart signals and lead to an inhibition
(or, according to the pacing mode, to a
triggering) of stimulation.
Содержание PACE 203H
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