Prevalence of Cardiac Arrhythmias and Distal Conduction Disorders in Patients With Chronic Chagas' Disease and Elevated Autoantibodies Against M2 Muscarinic Acetylcholine Receptors.

Chagas' disease (ChD) is a parasitic disease endemic to regions of Latin America and with an increasingly global reach. Up to 30% of patients with ChD develop severe dilated cardiomyopathy, ventricular arrhythmias, conduction disorders and/or sudden cardiac death. Autoantibodies against M muscarinic acetylcholine receptors (M mAChR) have been implicated in the pathogenesis of ChD.

Pacemaker-mediated tachycardia with narrow QRS complexes.

Inverted connection of the atrial and ventricular leads is an unusual circumstance during the implantation of a dual-chamber pacemaker. Yet, PMT may present in the absence of complex mechanisms. The detection and termination algorithms used by the device proved to be efficient for the adequate diagnosis and treatment.

Masquerading bundle branch block obscuring the diagnosis of Brugada syndrome: an electrocardiographic and vectorcardiographic study.

We describe the induction of a masquerading bundle branch block in two patients with Brugada syndrome following the administration of Ajmaline. The development of this conduction disturbance prevented the correct electrocardiographic diagnosis. However, the simultaneously obtained vectocardiogram identified both the Brugada pattern and the masquerading bundle branch block.