What Is the Most Appropriate Stimulation Mode in Patients with Sinus Node Dysfunction?

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  • Quel Est le Mode de Stimulation Idéal dans le Dysfonctionnement du Noeud Sinusal?

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<jats:p>Sinus node disease (SND) has caused many controversies about the appropriate stimulation mode. We compared the advantages and disadvantages of VVI, AAI, DDD, and DDI mode. In an additional study, left ventricular function at rest [R] and during exercise [E] was investigated in dual chamber and ventricular stimulation mode with a stimulation rate of 70 ppm [R] and 110 ppm [E]. A total of 223 patients [pts] was investigated (67 AAI, 87 VVI, 69 DDI]. Hemodynamic disadvantages in VVI mode resulted in a 55% actuarial incidence of atrial fibrillation after five years. In AAI mode, we found another 25% complication rate due to impaired AV conduction [n = 9] or a bradyarrhythmia [n = 6] with slow ventricular response. DDD mode implies the possibility of sustaining a pacemaker mediated tachycardia. Single ventricular stimulation with a high stimulation rate (110 ppm] under E showed a worse left ventricular performance as compared to dual chamber stimulation. DDI mode shows none of the aforementioned disadvantages. To sum it up: Until a dual chamber rate responsive pacemaker becomes available, the DDI mode represents the best stimulation mode for patients with a SND.</jats:p>

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