Macro-reentrant Single-loop Biatrial Flutter Appearing as Typical Atrial Flutter: Case Study and Review.

Biatrial flutter is a rare form of macro-reentrant atrial tachycardia that involves both the right and left atria. Single-loop biatrial flutter is typically associated with scarring of the septum from prior ablation or surgery and is generally made up of two interatrial connections-that is, the coronary sinus and Bachmann's bundle. Entrainment and high-density mapping allow for rapid diagnosis and development of a treatment strategy.

A prospective study comparing the sensed R wave in bipolar and extended bipolar configurations: the PropR study.

Background: Progress in implantable cardiac defibrillator (ICD) technology has allowed for switching the sensing polarity for the detection of ventricular fibrillation (VF). However, whether one sensing polarity confers additional advantage over the other is not known.

Objectives: To determine whether one sensing polarity is superior to the other for the detection of VF.