Rare Paradoxical Response of Tachyarrhythmia to Adenosine Complicated by Novel ECG Artifact.

Adenosine is widely used for the diagnosis and treatment of supraventricular tachyarrhythmia. We report a rare case of adenosine use associated with the development of 1:1 atrial flutter with aberrancy. The diagnosis was further complicated by a newly described ECG artifact associated with Wireless Acquisition Module (WAMTM) ECG acquisition mimicking rhythm irregularity.

Unfortunately Fortunate: Self-Terminating Device-Initiated Tachyarrhythmia in a Patient With a History of Idiopathic Lead Migration.

An 88-year-old female presented with inappropriate implantable cardioverter-defibrillator shocks. Interrogation revealed lead noise sensed as ventricular fibrillation, leading to 11 shocks in 1 day. A defibrillation at the period of maximal vulnerability caused true ventricular fibrillation/ventricular tachycardia and additional shocks, which failed to terminate device-initiated tachyarrhythmia.

Human Electrical Muscular Incapacitation and Effects on QTc Interval.

Human Electrical Muscular Incapacitation (HEMI) is used to subdue combative individuals. Changes in cardiac electrical activity have been proposed as the cause of death in a small fraction of these individuals. The current study sought to determine whether changes in QTc interval occur after HEMI exposure.

Management of central venous gradient using excimer laser lead extraction of chronic indwelling pacemaker leads in the setting of ipsilateral arteriovenous fistula.

Device therapy is becoming common in those patients with renal insufficiency. Coexisting need for arteriovenous (AV) fistula placement is often contemplated relative to device placement. We describe the excimer laser lead extraction of a malfunctioning chronic atrial pacemaker lead ipsilateral to an AV fistula.

Survival after spontaneous coronary artery dissection presenting with ventricular fibrillation arrest.

Spontaneous coronary artery dissection (SCAD) is a rarely documented etiology of myocardial infarction and sudden cardiac death (SCD). We present a case of a 37-year-old non-pregnant female who presented with a left anterior descending artery (LAD) dissection complicated by ventricular fibrillation arrest. After early diagnostic catheterization and medical management, our patient experienced a complete recovery, returning to her pre-SCD status without limitation.

Surface electrocardiography and histologic rejection following orthotopic heart transplantation.

Background: Intraventricular conduction delay and QT interval dispersion may be related to electrical instability and the risk of ventricular arrhythmogenesis. The interlead variability of the QT interval on a surface 12-lead electrocardiogram (ECG) has been associated with an increased likelihood of sudden death in patients with long QT syndromes, in patients recovering from myocardial infarction, and dilated cardiomyopathy. We sought to determine the incidence of increased QT(c) dispersion (QT(c-d)) relative to biopsy grade of severity of rejection.