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SPONTANEOUS ELECTRICAL ACTIVITY IN DENERVATED EXTRA‐OCULAR MUSCLES
Author(s) -
JENSEN SVEND FAURSCHOU
Publication year - 1972
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1972.tb06622.x
Subject(s) - fibrillation , denervation , motor unit , atrophy , medicine , duration (music) , anatomy , cardiology , atrial fibrillation , physics , acoustics
The occurrence of fibrillation potentials and their duration and amplitude were studied in denervated extra‐ocular muscles from both rabbits and humans. Denervation was total in the rabbits and of various degrees in the humans. Fibrillation potentials were recorded from the denervated rabbit muscles and from 23 of 58 human extra‐ocular muscles with neurogenic atrophy. In the rabbit ocular muscles there was no difference in duration or amplitude between potentials of motor units and fibrillation potentials. In the human ocular muscles the mean duration of 66 fibrillation potentials was 2.0 msec, s.d. 0.4 msec, and the mean duration of the motor unit potentials was 2.8 msec, s.d. 0.4 msec. The mean amplitude of the human fibrillation potentials was 88 μV, s.d. 52 μV, and the mean amplitude of the motor unit potentials was 102 μV, s.d. 58 μV. In the human ocular muscles 93% of the recorded fibrillation potentials were simple triphasic potentials. In the rabbit ocular muscles the distribution of potentials by phase was approximately the same for normal and for denervated muscles.