User's Manual

15
Indications and Contraindications
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• If slow retrograde conduction is encountered after ventricular
pacing, a longer atrial refractory period and/or a shorter AV delay
may have to be programmed to prevent pacemaker-mediated
tachycardia. Programming DDI, DVI, or VVI modes is rarely required
in these instances.
• If elevated rates above the basic rate are not well tolerated by the
patient (e.g., the patient has chest pain as a result), a low “upper
rate” and lower “maximum sensor rate” should be programmed. In
these cases, atrial-controlled modes and rate-adaptive modes may
even be contraindicated.
• If a case of pacemaker syndrome has been observed or is likely to
develop, the modes VDD, VVI and VOO are contraindicated. The DDI
mode is contraindicated in cases of pacemaker syndrome where
sinus rates are above the basic rate.
• Atrial single-chamber pacing is contraindicated in the presence of
existing AV conduction disorders or if failing AV conduction can be
demonstrated by suitable tests.
• In the presence of competing spontaneous rhythms, modes without
sensing and inhibition ability in the chamber affected are
contraindicated.
• Unipolar pacing is contraindicated for patients who also have an
implanted cardioverter-defibrillator (ICD). There is a risk of ICD
inhibition or accidental delivery of pacemaker pulses.