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Biomedical subjects

S P Bulgakov

Publications and source records attributed to S P Bulgakov.

7 recordsLinked to original sources
PubMed1975

[A statistical analysis of the intervals between motor unit impulses in patients with myasthenia].

Motor unit (MU) potentials of m. triceps br. of healthy subjects and patients with myasthenia gravis were recorded during slight isometric contractions. MU potentials were visually identified, semi-automatically coded and automatically led in the digital computer. In myasthenia the mean frequency of the MU discharges and SD of the interspike intervals were higher than in healthy states, the difference being not great, but significant. The interspike interval hystograms of single MUs were unchanged (normal). So the disturbances in pattern of motoneurone activity in myasthenia were mild. Proserin raised the muscle contraction strength and normalized the interspike interval variability but did not lower the frequency of MU discharges. The increase of the frequency may be accounted for the reduction of Renshaw inhibition.

Adolescent↗
PubMedDate not supplied

[Frequency transducer for magnetic recording of bioelectrical processes].

In conducting electrophysiological and medical investigations, in registration of bioelectric processes in particular, various types of converters permitting notation of bioelectric signals can be used with an ordinary tape recorder instead of costly magnetic registrators. A frequency converter with whose help it is possible to register bioelectric processes in a frequency range of 0.1 to 10(3) Hz with a conversion error of not more than 1.5 per cent is proposed.

Electrodiagnosis↗