One to one atrioventricular (AV) or atrio-His bundle (AH) conduction occurred during right
atrial pacing at rates of 300/min in two patients with short PR (and AH) intervals, narrow QRS …

Few studies have suggested that in patients with positive tilt tests, spontaneously occurring
syncope or presyncope (SPS) could be due to, or associated with, paroxysmal (advanced) …

Alternating Wenckebach periods were defined as episodes of 2: 1 block during which there
was a gradual prolongation of the transmission intervals preceding the appearance of 3: 1 or …

Background: Chikungunya fever is an arthropod-borne disease that has caused millions of
infections globally. Local transmission has been reported in the United States. There are …

The various patterns resulting from stimulation through the catheter electrodes recording His
bundle activity were evaluated in 30 patients using intracardiac electrograms from the right …

Few studies have dealt with the effects of isoproterenol on ventricular parasystole.
Intravenous isoproterenol (2 to 4 μ/min) was administered to 11 nonmedicated patients with …

A patient had ventricular tachycardia with cycle lengths consistently varying between 400
and 490 ms. Arrhythmias with a similar electrocardiographic pattern had been thought to …

Pseudo bundle branch block, a previously unreported arrhythmia produced by concealed
premature impulses arising in the bundle branches, was seen in two patients with sick sinus …

Ajmaline, a class I antiarrhythmic agent, has been used extensively for many years in
Europe and South America, mainly for diagnostic purposes. 1-6 Although the relatively low …

Invasive electrophysiological studies were performed in 2 symptomatic patients with
recurrent arrhythmias in which impulse formation presumably occured within atrioventricular …