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- W2400602345 abstract "Atrial fibrillation (AF) is a re-entrant rhythm, and patients with AF have intra-atrial conduction abnormalities as evidenced by prolonged P-wave duration, abnormal SAECG of P wave, fragmented atrial electrograms and greater intra-atrial conduction delays in response to APDs. Our previous work has proposed that intra-atrial conduction delays and dispersion of refractoriness during extrastimulus testing are site dependent; high right atrial (HRA) stimulation results in marked prolongation of intra-atrial conduction times and AF, whereas distal coronary sinus (CS) stimulation is associated with minimal conduction delays and absence of AF inducibility. Patients with AF induction during HRA stimulation also manifest non-uniform anisotropic conduction in the region of the posterior triangle of Koch. We postulated that if the posterior triangle of Koch is a critical area for re-entry that initiates AF, then prevention of early activation of the posterior triangle may prohibit AF induction by HRA APDs. Distal CS pacing pre-excites the posterior triangle in relation to HRA activation, therefore a subsequent HRA APD will activate the posterior triangle with a longer coupling interval. AF induction by HRA APDs following HRA pacing is prevented when same HRA APDs follow distal CS pacing. We propose that distal CS pacing eliminates the propensity of HRA extrasystoles to induce AF. This observation may have further clinical applicability in AF prevention." @default.
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- W2400602345 date "1997-12-01" @default.
- W2400602345 modified "2023-10-14" @default.
- W2400602345 title "Electrophysiology of atrial fibrillation and its prevention by coronary sinus pacing." @default.
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