Bidirectional ventricular tachycardia: Ping pong in the His–Purkinje system

The mechanism of bidirectional VT: A simple “ping pong” in the His–Purkinje system

Both supraventricular or ventricular mechanisms of bidirectional VT (BVT) have been proposed in the past, involving either focal or reentrant mechanisms.(Levy 1989) A supraventricular mechanism with alternating LAFB and LPFB(Rosenbaum 1969)was largely excluded with the advent of intracardiac recordings, which failed to show a His bundle potential preceding the alternating QRS complexes during B...

Ping pong in the pore

Getting to the inner circle ontiguity between the ER and the nuclear envelope means nuclear membrane proteins have a direct shot to their target. In fact, inner nuclear membrane (INM) proteins were thought to need only to diffuse to the nucleus, pass through the nuclear pore, and then be retained by nuclear-localized binding partners. But new results suggest a more active process. Suraj Saksena...

Bidirectional ventricular tachycardia.

Bidirectional ventricular tachycardia?

A 65-year-old woman was admitted to the hospital because of a syncopal episode with documented transient complete atrioventricular block. A DDD pacemaker was implanted. Post implantation, the patient was diagnosed with bidirectional ventricular tachycardia. Analysis of the arrhythmia and differential diagnosis is performed.

Experimental Bidirectional Ventricular Tachycardia in the Dog.

Bidirectional ventricular tachycardia is an uncommon cardiac arrhythmia and reports of only 50 cases have hitherto been published. Levy and Lewis (1911) were the first to notice this arrhythmia during their experimental work on cats, while Schwensen (1922) reported the first case of bidirectional ventricular tachycardia in man. Since then there has been general agreement that this arrhythmia ha...