Retrieval-induced forgetting under psychosocial stress: no reduction by delayed stress and beta-adrenergic blockade.

Retrieval-induced forgetting (RIF) is the phenomenon that 'retrieval-practice', the repeated retrieval of a subset of initially learned material, can impair the recall of episodically related memories. Previous studies showed that RIF is eliminated when retrieval-practice is carried out under psycho-social stress, anxiety, or in negative mood. However, pharmacological manipulation by hydrocortisone did not eliminate the effect.

Ablation of nonparoxysmal A-V nodal tachycardia.

The present study describes the successful radiofrequency ablation of an uncommon type of A-V nodal tachycardia. Electroanatomical mapping of the right atria was used to locate the region of the earliest atrial activation and allowed for positioning of the ablation catheter and a successful 25-watt radiofrequency burn in this area terminating the tachycardia. The ability to visualize multiple projections of pertinent intracardiac structures allows a more rapid and systematic approach by marking all ablation points even in the presence of AV block or AV dissociation.

Cocaine abuse: repolarization abnormalities and ventricular arrhythmias.

Increased QT and QT dispersion has been linked to arrhythmic death in patients with congenital and acquired long QT syndromes. The repolarization abnormalities were studied in 45 patients with a history of chest pain, somnolence, or disorientation admitted to the hospital for cocaine abuse. Group I was composed of patients with anginal chest pain (n = 23), whereas in group II patients (n = 22), chest pain was absent.