Comparison of electrophysiological parameters of septal and apical endocardial cardiac stimulation

Abstract

Comparação de parâmetros eletrofisiológicos das estimulações cardíacas endocárdicas septal e apicalComparison of electrophysiological parameters of septal and apical endocardial cardiac stimulation Abstract Background: The conventional right ventricle (RV) endocardial pacing leads QRS widening and myocardial desynchronization compromising ventricular function. With the need for less deleterious stimulation, RV septal pacing has been used more. Eventually have been reported higher thresholds and smaller R waves in the septal stimulation.Objective: To compare the parameters of the septal and apical stimulation, intra-patient, if there are any differences that may affect the choice of the point of stimulation.Methods: A prospective controlled study. We included 25 patients, 67.2±9 years, 10 (40%) women with indications for pacemaker for bradyarrhythmias. Etiologies were degenerative in nine (36%), Coronary disease in eight (32%), Chagas disease in seven (28%), and valve disease in one (4%) patient. Electrodes were active fixation and assessed the thresholds of command, impedance and R wave in uniand bipolar implant and after six months. Rev Bras Cir Cardiovasc 2012;27(2):195-202 Results