A 'concealed' accessory pathway was suspected in 12 patients because of eccentric left atrial activation during tachycardia. Retrograde conduction during ventricular pacing may occur over the atrioventricular node, the accessory pathway, or both. There were 4 patterns of ventriculoatrial conduction in response to ventricular extrastimuli (V2) at various coupling intervals: (1) exclusive accesso...

A 27-year-old man with primary oxalosis and extensive visceral involvement was maintained on long-term chronic hemodialysis. He had an episode of presyncope associated with electrocardiographic findings of an erratic atrial rhythm, atrioventricular dissociation due to an accelerated junctional rhythm and right bundle branch block. Electrophysiologic studies showed irregular atrial depolarizatio...

After right heart catheterisation in 20 subjects, aged 30 to 82 years, the techniques of intracardiac electrocardiography and programmed stimulation were used to determine variables of normal function of the sinuatrial node, atrioventricular node, and intraventricular conduction system. Specific attention was paid to autonomic influences on these variables. These were assessed by comparison of ...

Bradyarrhythmias, which include physiological and pathological disorders such as sinus node dysfunction atrioventricular conduction disturbances are frequent clinical findings in the emergency department. Although some benign bradyarrhythmias do not need treatment, acute unstable bradycardia can lead to cardiac arrest. A thorough history physical examination should cover potential causes of sin...

Twenty-three children underwent electrophysiological studies during routine postoperative catheterization two months to five years after complete correction of tetralogy of Fallot. The aim of the study was to investigate the whole conduction system, including sinus node function, suing His bundle recordings and atrial pacing. H-V intervals were normal at rest and with pacing in twenty-two patie...

The effect of alcohol (.1 mg/kg) on the sinus node and atrioventricular node was studied in 9 mongrel dogs. The sinus node function was evaluated by the sinus node recovery time and the atrioventricular node by the highest atrial pacing rate at which Wenckebach periodicity was developed. The effect was studied for 45 minutes. Three groups were identified: Group I, Low Concentration of Alcohol (...

AIMS The OPTI-MIND study aims to collect 2-year clinical outcomes of pacemaker patients in real-world clinical practice, overall and according to patient characteristics and pacemaker settings. METHODS AND RESULTS The present analysis of the OPTI-MIND study describes the programmed device settings after discharge from the pacemaker implant. The objective was to determine whether these setting...

BACKGROUND Sinus node dysfunction, atrioventricular (AV) block and atrial fibrillation (AF) are associated with advanced age. Required therapy commonly includes pacemaker implantation. METHODS We report the course of therapy for an 87-year-old with symptomatic sinus node dysfunction and paroxysmal atrial fibrillation who was intolerant of drug therapy. RESULTS The patient received a pacemak...