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  • 1
    ISSN: 1432-1246
    Keywords: Human skin ; Vibratory sensation Vibration exposure ; Threshold shift ; Acute effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A new, self-recording, vibratory sensation meter measures temporary threshold shifts of vibratory sensation (TTSv) on a finger tip. After exposure to hand-transmitted vibration with exposure frequencies 63 Hz, 200 Hz and 500 Hz, and levels of acceleration 1 g, 2 g, 4 g and 8 g, fingertip measurements were obtained. Temporary threshold shift immediately after the vibratory exposure (TTSVv,0) was estimated for each exposure from the regression analysis by approximation of an exponential function. Time constant (tc) was also estimated at the same time by the analysis. The coefficients of determination were large. Thus, the fit of the exponential function is very good for each exposure. The tc corresponds to the recovering velocity of the temporary shift and implies the half-life period of TTSv. These parameters enable us to examine more generally the relationships of TTSv to the characteristics of exposure vibration, subject and other conditions. On this basis, the estimated TTSv,0 and tc were used to examine the dependency of TTSv on the characteristics of the exposure vibration and the subject. The most effective frequency under the level of 4 g is thought to be between 200 Hz and 500 Hz. TTSv,0 of each subject proportionally increased with power of acceleration. The coefficient of determination on regression analysis was large. This result enables us to estimate TTSv,0 at an arbitrary level of acceleration by use of a regression equation derived from experimental data.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1530-0358
    Keywords: Obstetric injuries ; Rectovaginal fistula ; Fecal incontinence ; Incontinent anal sphincter ; Cloaca-like defect ; Anal/vaginal reconstruction ; Sphincteroplasty
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract PURPOSE: We categorized the various types of postobstetric injuries of the anorectum and vagina encountered in a five-year period. The operative procedures used to repair these injuries and the functional outcome after surgery were assessed. METHODS: Between 1986 and 1991, 52 patients were surgically treated for obstetric injuries of the anorectum and vagina; 48 patients were available for follow-up study. Four clinical injury types were identified: Type I, incontinent anal sphincter (11 patients); Type II, rectovaginal fistula (16 patients); Type III, rectovaginal fistula and incontinent anal sphincter (11 patients); and Type IV, cloaca-like defect (10 patients). The mean age of the patients was 30 years, the mean duration of symptoms before surgery was 13 months, and the mean follow-up period was 16 months. The major component of surgical repair for each injury type was: Type I, overlap repair of external anal sphincter; Type II, rectal mucosal advancement flap; Type III, overlap repair of external anal sphincter and rectal mucosal advancement flap; and Type IV, overlap repair of external anal sphincter, anterior levatorplasty, and anal and vaginal mucosal reconstruction. Fecal diversion was not performed in any patient. Specific questions were asked at the most recent follow-up assessment to determine results. RESULTS: Continence status postoperatively was classified as perfect, impaired, or poor; poor was defined as no improvement or worse. Postoperative continence (perfect, impaired, or poor) was, respectively: Type I (11 patients), 64 percent, 36 percent, and 0 percent; Type II (16 patients), 56 percent, 0 percent, and 44 percent; Type III (11 patients), 64 percent, 36 percent, and 0 percent; and Type IV (10 patients), 90 percent, 10 percent, and 0 percent. Vaginal discharge of stool was eliminated in all patients with a rectovaginal fistula. Subjectively, 92 percent of the patients had excellent or good results. Complications included wound hematoma (n=2), fecal impaction (n=2), urinary retention (n=1), and urinary tract infection (n=1). CONCLUSION: Patients with Type II injuries had the worst results (P 〈 0.001). These patients should be evaluated for anal incontinence before surgery to assess the need for a concomitant sphincteroplasty.
    Type of Medium: Electronic Resource
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