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(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
Tests are performed independently for the atrial and ventricular channels. This
quantitative test determines the required amplitude of the simulated ECG
signal to be detected 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.
Line Frequency / Noise Immunity
Tests are performed in two formats: atrial channel only and ventricular channel
only. This qualitative test checks the pacemaker's ability to filter line
frequency noise at either 50 or 60 Hz, and sense a simultaneously applied
simulated ECG signal. The user can change the amplitude of both the line
frequency noise. The simulated ECG signal amplitude is fixed.
Refractory Period
Tests are performed independently for the atrial and ventricular channels.
These two related qualitative tests determine the demand mode pacemaker's
ability to sense ECG activity immediately following either a paced event
(PRP) or sensed ECG event (SRP).
Paced Refractory Period (PRP)
The Analyzer first measures the pacemaker's applied pulse rate, then generates
a simulated ECG signal within the expected PRP interval. This coupling
interval is slowly extended until the simulated ECG signal falls outside the
PRP at which time it is sensed by the pacemaker, resetting the escape interval,
resulting in a longer pacing pulse interval.
Sensed Refractory Period (SRP)
The Analyzer now generates a second simulated ECG signal immediately
trailing the first simulated ECG signal used to determine the PRP. This
Transvenous Pacemaker Testing
4
Test Options
4-5
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