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Biomedical subjects

L Schamroth

Publications and source records attributed to L Schamroth.

At least 55 records · Page 3Linked to original sources
PubMed1985

Asynchronous intraventricular recovery as a basis for apparent 'supernormality'.

Various mechanisms have been postulated for the supernormal phase of intraventricular conduction where relatively early impulses are conducted with normal intraventricular conduction and relatively late impulses with abnormal intraventricular conduction. The cases presented here illustrate how asynchronous recovery of conducting tissue may result in fortuitous momentary synchrony early on in the recovery phase with asynchronous conduction properties in the later phases of recovery. This will facilitate potential synchronous conduction early on in the cycle which would result in a normal QRS complex, and potential asynchronous conduction in the later phases which would manifest with a bundle branch block QRS complex.

Aged↗
PubMed1985

The early signs of right bundle branch block.

Complete right bundle branch block manifests with a rSR' configuration in right orientated leads and a duration of 0.12 sec or longer. Incomplete right bundle branch block is perceived as this classic rSr' configuration and a duration of less than 0.12 sec. This presentation reflects the early development of right bundle branch block which first manifests with a hitherto undescribed sign, namely: a diminution of the S wave amplitude in lead V2. Further progression of the right bundle branch block leads to slurring or notching of the upstroke of the S wave in lead V2 followed by the development of a r' deflection. With further progression, the r' deflection becomes increasingly taller until the advent of complete right bundle branch block which is characterized by a widening of a very tall R' deflection with an apical notch or plateau.

Electrocardiography↗
PubMed1985

Oral propafenone in the suppression of chronic stable ventricular arrhythmias.

The efficacy of propafenone hydrochloride, a new antiarrhythmic agent, was evaluated in the treatment of chronic stable ventricular arrhythmias. Twenty-five patients who had suffered a myocardial infarction three months or longer before the trial were studied. All exhibited a minimum mean frequency of 30 ventricular ectopic beats per hour over at least two 24-hour Holter monitoring periods with the last recorded tape serving as a control. The mean decrease in ventricular ectopic activity with propafenone was 65.62 percent (p = less than 0.001). Side effects were infrequent, minimal, and of no clinical consequence. Oral propafenone was found to be an effective drug for reducing the level of chronic ventricular ectopy, as reflected by a short-term trial.

Administration, Oral↗
PubMed1985

Sinoatrial block with complicating sinoatrial reciprocation.

This presentation reflects an atypical manifestation of sinoatrial block in a patient with chronic renal failure and hyperkalemia (7.8 mEq/L). An allorhythmic distribution of P-P intervals permits the interpretation of sinoatrial block complicated by sinoatrial reciprocation.

Electrocardiography↗