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SigmaPace 1000
Operators Manual
Line Frequency / Noise Immunity
This qualitative test verifies 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 the line frequency noise, while
the simulated ECG signal amplitude is fixed.
Refractory Period
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, and then
generates a simulated ECG signal within the expected PRP interval. See
Figure 3-2. This coupling interval is slowly extended until the simulated ECG
signal falls outside the PRP. The signal is then sensed by the pacemaker,
causing the escape interval to reset. The result is a longer pacing pulse
interval.
3-6
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