title: [Analysis of the sinus node warming-up curve after atrial pacing].
abstract: Sinus node recovery to the pre-pacing heart rate after atrial pacing is generally gradual: this phase is called "warming-up" of the sinus node. We evaluated the sinus node warming-up curve in 47 patients who underwent electrophysiological endocavitary examination for diagnostic purposes: we evaluated this phenomenon after atrial pacing at a rate from 90 to 150 b.p.m., 1' lasting for each rate. Twenty-three patients, with impaired sinus node function (group 2), showed as an average a slower sinus node warming-up curve, compared to 24 patients with apparently normal sinus node function (group 1). In group 1, 20.83% of the patients showed abnormal sinus node warming-up curve compared to 60.86% of group 2 subjects. Irregular warming-up curves, i.e. with prolonged secondary pauses, are most frequently seen in group 2 patients with sinoatrial conduction disturbances.
mesh_terms: D000368:Aged; D001145:Arrhythmias, Cardiac / Q000150:complications / Q000628:therapy*; D002304:Cardiac Pacing, Artificial; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012849:Sinoatrial Node / Q000503:physiopathology*
vernacular_title: Analisi della curva di riscaldamento del nodo del seno dopo stimolazione atriale.