b. The following menu will be displayed:
c. Select the desired waveform by pressing UP (F2) or
DOWN (F3) and then Select (F4). Press CANCEL (F5) to
cancel the selection. After selection the main menu will
reappear.
d. Select SENS. TEST (F2). The following display will ap-
pear:
e. Upon completion of testing the results will be displayed un-
der RESULT. Press SENS. TEST. CANCEL (F5) to can-
cel the test.
5.4 Refractory Period Test
1. General. This test is used to test the time interval in millisec-
onds (ms) during which the pacemaker is insensitive to any ex-
ternal inputs. QA-45 does this by measuring the maximum time
interval after the generation of a pacer pulse, and maximum
time interval after a QRS wave.
a. Refractory Period. A time interval in milliseconds, during
which a pacemaker is insensitive to any external inputs. If a
QRS is detected during this period, the pacemaker ignores
it. On the other hand, if a QRS is detected outside the re-
fractory interval, then the pacemaker resets its internal
5
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