Fluke SigmaPace 1000, Operator'S Manual, Page: 59 / 154

Transcutaneous Pacemaker Testing
Test Options
3
3-5
Demand Mode
This qualitative test verifies the demand mode pacemaker’s ability to interact
with a simulated ECG signal. The Analyzer first measures the pacemaker’s
applied pulse rate then computes “underdrive” and “overdrive” rates for the
simulated ECG signal. Initially, the underdrive rate is 90 % of the applied
pacemaker rate and the overdrive rate is 110 % of the applied pacemaker rate.
When testing the pacemaker, operating in the demand mode, output should be
active (ON) with the underdrive ECG signal and then inhibited (OFF) when
the overdrive ECG signal is selected. The rates of these underdrive and
overdrive ECG signals can be adjusted across a wide physiological range using
the Analyzer top panel controls.
Asynchronous Mode
This qualitative test verifies the continuous (or non-demand) mode
pacemaker’s ability to interact with a simulated ECG signal. The Analyzer
first measures the pacemaker’s applied pulse rate then computes underdrive
and overdrive rates for the simulated ECG signal. Initially, the underdrive rate
is 90 % of the applied pacemaker rate and the overdrive rate is 110 % of the
applied pacemaker rate.
When testing the attached pacemaker, operating in the continuous (or non-
demand) mode, output should be active (ON) when either the underdrive ECG
signal or overdrive ECG signal is selected. The rates of these underdrive and
overdrive ECG signals can be adjusted across a wide physiological range by
the user.
Amplitude Sensitivity
This quantitative test determines the amplitude of the simulated ECG signal
required by the demand mode pacemaker. The amplitude of the simulated
ECG signal is increased in very small steps until the pacemaker senses it and
inhibits the output pulse.