Hemodynamics of Cardiac Pacing

Efeitos da estimulação ventricular convencional em pacientes com função ventricular normal

“…The DDD stimulation preserves the atrioventricular synchronism and presents better hemodynamic data 14 . However, the prospective studies designed with the objective of analyzing its impact on mortality were disappointing.…”

ECG of the Month

“…Atrioventricular synchrony provides normal cardiac output with preservation of the atrial contribution to ventricular filling; this is a more physiologic response to sinus node rate and allows a more appropriate response during exercise or sympathetic stimulation and a potentially longer battery life, as well as avoidance of increased atrial pressures that can lead to derangements in neurohormones such as atrial natriuretic peptides. 6 In human studies, DDD-paced patients have less sleep disturbance and sleep apnea, 7 improved cardiac output and systolic blood pressure, 8 and lower atrial and pulmonary capillary wedge pressures and plasma atrial natriuretic peptide concentrations, compared with VVI-or VVIR-paced patients. 6 The disadvantages of DDD pacemakers include size limitations among recipients; these are generally reserved for use in larger dogs.…”

“…6 In human studies, DDD-paced patients have less sleep disturbance and sleep apnea, 7 improved cardiac output and systolic blood pressure, 8 and lower atrial and pulmonary capillary wedge pressures and plasma atrial natriuretic peptide concentrations, compared with VVI-or VVIR-paced patients. 6 The disadvantages of DDD pacemakers include size limitations among recipients; these are generally reserved for use in larger dogs. Dual-chamber pacemakers are more complex than single-chamber pacemakers, and their use is associated with potential increased risk of lead dislodgement and lead infection.…”