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  • Acustic analysis  (1)
  • C-peptide  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 66 (1988), S. 175-180 
    ISSN: 1432-1440
    Schlagwort(e): Human corticotropin-releasing factor (hCRF) ; C-peptide ; Naloxone ; Opioid receptor blockade ; Type 2 diabetes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Administration of synthetic human corticotropin-releasing factor (hCRF, 2 µg/kg body weight) during simultaneous application of the opioid antagonist naloxone (1.6 mg i.v. bolus, followed by an infusion at a rate of 1.2 mg/h) produced a significant increase in plasma C-peptide levels of six male Type 2 diabetic patients which even exceeded the postprandial values. This stimulatory effect of hCRF/naloxone on plasma C-peptide was less pronounced in six healthy men. hCRF alone did not provoke any reaction of plasma C-peptide in either group. The possibility of a paracrine, CRF-dependent mechanism in pancreatic islets which somehow involves inhibitory opioid receptors is preferentially discussed. Such a mechanism may underlie the stimulatory action of hCRF/naloxone on B cells and would explain the absent reaction of peripheral venous plasma C-peptide to hCRF alone as well as the amplifying effect of simultaneous opioid receptor blockade.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Research in experimental medicine 189 (1989), S. 129-140 
    ISSN: 1433-8580
    Schlagwort(e): Auscultation ; Abdomen ; Bowel sounds ; Intestinal motility ; Acustic analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary In an attempt to find a non-invasive method yielding a comprehensive insight into a patient's intestinal activity, continuous multichannel registration and analysis of acustic phenomena as produced by the intestines were performed. Previous work, described by others, was further developed with respect to topographical interpretation of the data obtained, and to the possible introduction into general clinical use by installing different methods of artifact detection and reduction. To record and process bowel sounds, a device developed for this purpose (Phonoenteroanalyzer PEA-06, G-W Elektronik, Munich, FRG) was used. Five specially designed microphones were placed on the abdominal wall. After amplification and filtering, further processing of the signal was achieved by means of rectifying, peak detection, and logarithmic transformation techniques, yielding a topographically discernible pattern of intestinal activity. Noise and movement artifacts, although a basic problem of this technique, could be adequately managed, e.g., by using a control microphone as well as simultaneous registration of breathing. Ten normal subjects as well as eight patients with manifest or suspected gastrointestinal problems, had their bowel sounds registered either continuously overnight or during adequate stimulatory tests (gastrocolonic response, neostigmine test, rectal distension). Bowel sounds were registrated as short “clicks” or longer lasting, sometimes rhythmically appearing, complex acustic phenomena. Overnight registrations revealed periodical changes in general or local intestinal activity, which in turn showed remarkable interindividual variabilities. Stimulatory tests provoked an enhancement of intestinal activity, which could well be documented with this method. In conclusion, analysis of acustic phenomena provoked by the bowels should henceforth allow an objective, continuous, long-term, non-invasive, indirect, and at any time repeatable topographical registration of intestinal activity.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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