TAVI Clinical Trial
Official title:
STIMulation Cardiaque et TAVI : évolution Des Troubles Conductifs Atrio-ventriculaires après TAVI
The investigators propose to carry out an observational study of patients implanted with a pacemaker using AAI SafeR® mode after a TAVI procedure. This study aims to define the persistence or not of high-grade AVB beyond seven days after the procedure, based on the analysis of PM memories, and define definitive cardiac pacing indications after TAVI procedure.
Atrioventricular (A-V) conduction disorders are common after Transcatheter Aortic Valve
Implantation (TAVI) and the average of a pacemaker implantation after TAVI is 15% to 17%.
The European Society of Cardiology recommends to implant a permanent pacemaker (PM) in case
of persistant high-grade A-V block (AVB) within 7 days of a TAVI procedure (class I
recommendation, level of evidence C).
Some conduction disturbances are transient and might not need a definitive indication for
pacemaker implantation. A recent study, based on dependency of patients to pacing, estimate
that in half the patients, conduction disturbances that led to the implantation of a
pacemaker after TAVI procedure would have disappear 30 days after the procedure.
Many studies tried to better define the indications of these devices. However, their
evaluation criteria do not allow to prove these pacemakers were useful, because these studies
are mainly based on the rate of implantation of pacemakers, or on the percentage of
ventricular pacing. These studies may overestimate the usefulness of the pacemaker because of
unnecessary ventricular pacing, or underestimate it in patients with high grade paroxysmal
AVB, that could have been responsible for syncope or death.
Today some pacemakers allow a better occurrence of spontaneous A-V conduction and monitor
precisely the atrioventricular conduction.
The AAI SafeR® mode from Sorin® allows the pacemaker to switch from a single to a dual
chamber mode in case of AVB; these switches are stored in the memories of PM as endocardial
electrogram (EGM) which can be validated afterwards. The use of this algorithm could allow an
accurate assessment of the persistence of high level conduction disturbances in patients
implanted with a pacemaker after a TAVI procedure. A study published in late 2014 using this
tool in monitoring post TAVI conduction disorders on a small number of patients, other
studies used the same tool in other cardiac pathologies.
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