User's Manual

Timing Functions

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Basic Rate:

Increased value, for example 90 ppm

Rate Hysteresis:

Such that the hysteresis rate at rest is always lower than the intrinsic

rhythm (e.g., -50)

Scan Rate Hysteresis:

Enabled, with the number of cycles set according to the patient's

condition

Repetitive rate

hysteresis

Enabled, with a low number of cycles

This programming will inhibit the pacemaker until bradycardia

episodes occur. If the rate drops due to an event, the pacemaker will

pace at the hysteresis rate for the set number of repetition cycles (the

confirmation period). The pacemaker will switch to the higher

intervention rate to prevent possible syncope only if a spontaneous

rhythm does not occur during the confirmation period, which should be

set as short as possible. The pacemaker will scan for a spontaneous

rhythm every 180 cycles (scan rate hysteresis) to avoid long pacing

phases. If the attack has been terminated by that time, the pacemaker

will be inhibited; otherwise, it will repeat the scan every 180 cycles.

Note: These patients should only be treated with a

DDD(R) system to exploit the contribution of the

atrium to ventricular filling and to overall

hemodynamics as much as possible during such

attacks.

Night Program

When the night program is activated, the pacemaker reduces its

activity during the night. This makes it possible to adapt the pacing

rate to the patient's reduced metabolic needs during this time.

Furthermore, VVI and VOO pacing may prevent the possible worsening

of hemodynamics.