EXPMT 2000 User Manual/R5
15
5. Set the desired rate width and amplitude (current) on
the
Transcutaneous pacer.
6. The display will flash
“????”
until the pulse is detected and
the
rate,
width and the current will be displayed.
7. Use right arrow (’ >’) key to display the secondary menu.
Then press the F1, F3 or F4 for selecting
‘
curr
ent’
’,
‘energy’
and
‘volt’ respectively.
8. The measurement cycle continues and the display
is
updated.
9. To save the test result press the
“SAVE”
key.
10. The test result displayed will be saved with the Equipment
ID
set in the beginning.
The
display will return to the main Menu.
Pace Refractory period Test
The refractory period of a demand pacemaker is the
time
interval during which a pacemaker is insensitive to
ECG
signal
.
If an
ECG
signal is detected during this period, the pacemaker
ignores it. Howe
ver
,
if an
ECG
signal is detected outside
the
refractory interval, then the pacemaker resets its internal
timer
and the next pacer pulse is generated after a delay of one
time
from this
ECG
wave.
Measurement of the pace refractory takes a few cycles of
the
pacemaker output. EXPMT 2000 measures the pacer pulse
interval and puts out a QRS wave at 40 milliseconds wide,
delayed by a time determined initially by checking the pacer
rate. The pacemaker senses this
QRS
wave. The delay time
is
gradually decremented until the
QRS
waveform is not sensed by
the pacemaker. The maximum value of the delay time for
which
the pacemaker does not sense the square wave, is the pace
refractory period.
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