A filter bank analyser with simultaneous readout for the evaluation of dynamic myoelectric signal power spectra

The anorectal function in 3 patients with bilateral and 4 patients with unilateral well-defined loss of sacral nerves after radical tumour excision was studied by clinical examination and by simultaneous registration of the following variables: volume and pressure in the rectum, pressure in the internal anal sphincter area and myoelectrical activity in the external anal sphincter. The patients with bilateral loss of sacral nerves had serious impairment of function. Constipation was their only safeguard against incontinence. The preservation of the first and second sacral nerves bilaterally was not sufficient for discrimination between different qualities of rectal contents passing the anal canal. The sensation of rectal distension was also impaired. The reflex pattern of the internal anal sphincter was, however, intact. The external anal sphincter displayed a weak spontaneous myoelectrical activity in the patients who had at least one second sacral nerve intact, and a weak increase of the activity could be induced voluntarily. The normal transient increase of myoelectrical discharge from the external anal sphincter in response to rectal distension could not, however, be elicited. In patients with total unilateral loss of the sacral nerves no significant impairment of anorectal function was noted. Total one-sided denervation implied deficient sensibility of the anal canal unilaterally, but no disturbance of sphincter function as judged from the reflex response of the internal and external anal sphincters to rectal distension.

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Anorectal function after major resections of the sacrum with bilateral or unilateral sacrifice of sacral nerves

Gunterberg

Kewenter

Petersén

et al. 1976

British Journal of Surgery

202

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Ein optimierter Filterbankanalysator zur Quantifizierung lokaler Muskelerm�dung

Kahabka

Rohmert

1982

Europ. J. Appl. Physiol.

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A filter bank analyzer is described which determines the central frequency of the electromyographic signal as a characteristic value and exhibits it continuously. In contrast with previous methods, this analyzer needs only a narrow frequency band and few filters to obtain exact quantitative results. The filter bank parameters are determined by adapting them to the amplitude spectra of electromyograms during fatiguing dynamic muscle work. Six parallel band-pass filters transmit the expected average spectral function, with minimized differences in the frequency range from 18 Hz to 140 Hz. The systematic error of the center frequency amounts to less than 0.5%, when using precision filters with high roll-off. An example compares the shift of center frequency method with the fatigue index of myoelectrical activity.

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Filter bank analyser for automatic analysis of the e.m.g.

Petrofsky

1980

Med. Biol. Eng. Comput.

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A filter bank analyser with simultaneous readout for the evaluation of dynamic myoelectric signal power spectra

Cited by 11 publications

References 7 publications

Anorectal function after major resections of the sacrum with bilateral or unilateral sacrifice of sacral nerves

Anorectal function after major resections of the sacrum with bilateral or unilateral sacrifice of sacral nerves

Ein optimierter Filterbankanalysator zur Quantifizierung lokaler Muskelerm�dung

Filter bank analyser for automatic analysis of the e.m.g.

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