Biomedical subjects

P R Lightfoot

Publications and source records attributed to P R Lightfoot.

8 recordsLinked to original sources

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↗

PubMed1977