User Manual

15. FUNCTIONS AND PARAMETERS
PACING MODES
The pacing mode determines pacemaker operation when pacing and sensing. The meanings
of the codes (e.g., DDD, VVI, AOO) are provided in Standards EN 45502-2-1 and ISO
14708-2.
For the DR model, the SafeR and DPlus modes are described in the section "Therapeutic
improvements".
Contraindications to the use of specific modes for the both SR and DR models:
1. AAI(R) pacing is contraindicated where AV conduction is impaired.
2. Asynchronous pacing is contraindicated when there is competition between the patient's
intrinsic rhythm and the pacemaker.
Contraindications for the DR model: DDD pacing is contraindicated in patients with chronic
atrial fibrillation or flutter, or in those with slow retrograde conduction, which may induce
Pacemaker-Mediated Tachycardia
MRI Mode
The MRI mode is an asynchronous mode (VOO/AOO or OOO for the SR model; DOO, VOO,
AOO or OOO for the DR model) which is triggered either manually or upon detection of a
strong magnetic field.
The MRI Mode is intended to be applied during MRI examination. When MRI Mode is
activated (Auto or Manual), the magnet mode is ineffective.
NOTE: Refer to the MRI Solutions manual for the complete instructions for use available at
www.microportmanuals.com.
RATES
Basic rate
The basic rate is the pacing rate in the absence of sensed events. If the patient’s spontaneous
rate falls below this limit, the pacemaker takes over.
Special case:
If rest rate or hysteresis is programmed, the lower limit of the intrinsic rate may reach a value
below the basic rate.
Programming requirement:
If the rate-responsive pacing function is ON, the lower limit of the basic rate is 50 ppm.
Maximum tracking rate
The maximum tracking rate determines the upper limit of the pacing rate.
15.1.
15.1.1.
15.2.
15.2.1.
15.2.2.
15. FUNCTIONS AND PARAMETERS
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