User's Manual

14
Indications and Contraindications

The functions "Automatic Mode Conversion" and "Mode Switching" in
connection with the pacing modes DDD(R) and VDD(R) are useful in
cases of paroxysmal atrial tachyarrhythmia to interrupt any atrial
synchronization of ventricular pulses during the phases of atrial
tachyarrhythmia. The DDD(R) mode with Mode Conversion is an
alternative to the DDI(R) or DVI(R) mode in this case.
The AAI mode is indicated in the presence of symptomatic sinus node
dysfunction as long as adequate AV conduction exists. The VVI mode is
indicated in cases of symptomatic bradycardia when there is no
(longer) significant atrial contribution to hemodynamics.
The demand modes as well as the asynchronous DOO, AOO, and VOO
modes (with reduced sensing functions) are indicated in cases of
medical/technical complications (e.g., electromagnetic interference,
sensing errors, lead fractures, detection of myopotentials, muscle
stimulation, etc.).
The triggered pacing modes DDT, DDI/T, VDT, DV T, AA T, and VVT as
well as the VDI and OFF modes are indicated for diagnostic purposes.
General Contraindications
There are no known contraindications for the use of
multiprogrammable and multifunctional dual-chamber pacemakers,
provided that implantation is preceded by an adequate diagnosis, and
no parameter combinations inappropriate for the patient’s condition
are programmed. In individual cases, it is recommended that the
tolerance and effectiveness of parameter combinations are checked by
observing the patient for some time after programming. The following
are contraindicated:
• Operating modes with atrial control (DDD, VDD, AAI) are
contraindicated in the presence of chronic atrial tachycardia as well
as chronic atrial fibrillation or flutter.