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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
refractory, except that DELTA 3300 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 pulse 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). The Sense refractory and the pulse
rate will be displayed after a few pacer pulse cycles and
the flashing of ‘????’ stops and the result will be
displayed.
2. The measurement cycle continues and the result is
updated. To interrupt the cycle press “ESC” key.
3. 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 sensitivity measurement three different
waveforms are selectable, 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 refractory period. Delta
3300 checks weather this wave is sensed by the pacemaker or
not.
Summary of Contents for Delta 3300
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