EXPMT 2000 User Manual/R5
17
Sense Refractory Test
The sense refractory time is the interval after a
QRS
wave
is
sensed by the pacemaker during which time the presence of a
second
QRS
wave is not sensed.
The sensed refractory period is measured similar to the pace
r
efract
or
y
,
except that EXPMT 2000 now generates a
QRS
outside of the paced refractory period. The pacemaker senses
the
QRS.
The
QRS
time is slightly increased each time with
the
pacer pulse until the pacer senses the
QRS
and resets. The
delay time from the first QRS to the sensed QRS is the sensed
refractory period. The measurement takes a few cycles. When
the’
????’
on the screen stops, the result is displayed.
1. Select “Sens” (F4) from the Refractory selection menu.
2. The Sense refractory and the pulse rate will be displayed
after a few pacer pulse cycles and the flashing of ‘????
’
st
ops
.
3.
The
measurement cycle continues
and
the result is updated.
To interrupt the cycle, press the
“ESC”
key.
4. To save the test result press “Save”. The result will be saved
to the Equipment
ID
set earlier.
Sensitivity Test
Pacer sensitivity period is the minimum
QRS
amplitude
(mV
)
required to cause the pacemaker to operate in the demand
mode. During the sensitivity measurement test, four
diff
er
ent
user selectable waveforms are
available,
with widths varying
in
steps from 10 to 400 mS. The selected waveform is delayed
from the pacer pulse so that it is outside the pacing
r
efract
or
y
period.
The amplitude of the
QRS
is gradually increased from 0.5 mV
steps until the Analyzer detects pacer pulse. The amplitude
at
which the pacer pulse is sensed is the sensitivity in mV.
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