Pulse Width; Sensitivity; Pacing And Sensing Polarities - sorin REPLY DR Manual De Implante

i Pulse width
The pulse width determines the duration for which the pulse
amplitude is applied to the heart during pacing.
Programming requirement: When the Auto-threshold function is
programmed to "Monitor" or "Auto", the programmable ventricular
pulse width is less than or equal to 0.5 ms.
i Sensitivity
The sensitivity determines the minimum signal sensing threshold. For
example, a sensitivity of 1 mV will allow sensing of only signals with
an amplitude greater than 1 mV. In order to detect a low-amplitude
cardiac signal, a higher sensitivity (lower value) must be
programmed. However, if the pacemaker detects extracardiac
signals, a lower sensitivity (higher value) must be programmed.
Recommendations: 1. A safety margin of 2 to 3 times the amplitude
of the recorded signal should be maintained. 2. Programming a high
atrial sensitivity (value less than or equal to 0.6 mV) should be
reserved for P-waves of very low amplitude, since this increases
sensitivity to external interference. These values may also be
programmed for patients likely to present paroxysmal episodes of
atrial fibrillation.
Programming requirements: 1. In unipolar mode, atrial sensitivity
values below 0.4 mV are not available. 2. When the atrial (or
ventricular) Autosensing is programmed to Auto, the atrial (or
ventricular) sensitivity is no longer programmable.
i Pacing and sensing polarities
Although mechanically configured as a bipolar pulse generator, the
pacemaker may be programmed either to unipolar or bipolar
configuration. Pacing and sensing polarity configuration can be
programmed independently for the atrial and ventricular channels.
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