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Biomedical subjects

P R Lightfoot

Publications and source records attributed to P R Lightfoot.

13 recordsLinked to original sources
PubMed1983

Idiopathic recurrent parasystolic ventricular tachycardia in a child.

An asymptomatic 3 1/2-year-old boy demonstrated parasystolic ventricular tachycardia with AV dissociation, early sinus capture beats, marked variability in coupling intervals between conducted and ectopic beats, fusion beats, and interectopic intervals which were multiples of the ectopic cycle length. The arrhythmia initially responded to quinidine, reappeared over an 11-month observation period, and finally was suppressed at a high quinidine dose. An invasive and noninvasive work-up failed to demonstrate organic heart disease.

Child, Preschool↗
PubMed1978

Parasystole simulating ventricular bigeminy with Wenckebach-type coupling prolongation.

A 65-year old male originally presented with repetitive ventricular bigeminal sequences demonstrating progressive prolongation of successive coupling intervals suggesting Wenckeback-type exit block. An even number distribution of conducted beats always intervened between bigeminal sequences. Subsequent analysis proved this to be a fortuitous "pseudo-Wenckebach" phenomenon, with the actual mechanism being continuous parasystole. Additional recording verified a parasystolic rhythm.

Action Potentials↗
PubMed1977

Intermittent parasystole with concealed extrasystolic bigeminy during myocardial infarction.

A 72-year-old man demonstrated persistent intermittent ventricular parasystole for 6 days during an acute inferior wall myocardial infarction. Entrance block failure occurred at a critical interval of 1.24 sec. after parasystolic beats with resetting of the parasystolic cycle length. The first ectopic beat in each parasystolic series showed coupling to its second preceding conducted beat, and successive cycle lengths in each series usually showed gradual shortening. Concealed extrasystolic bigeminy was also demonstrated between parasystolic series with the number of intervening conducted beats conforming to the formula 2n + 2. After interpolated parasystolic beats, this formula became 2n + 3.

Aged↗
PubMed1975

Concealed extrasystolic ventricular bigeminy with interpolation.

The first reported case of concealed extrasystolic ventricular bigeminy with interpolation is described. This arrhythmia is characterized by the presence of both interpolated ventricular extrasystolic beats and a presumed persistent and continuous bigeminal ectopic rhythm with exit block. The distributional pattern of sinus conducted beats in the present case conforms to a formula defining this unusual disorder of rhythm, while the appearance of manifest ectopic beats follows the rule of bigeminy.

Cardiac Complexes, Premature↗