{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,17]],"date-time":"2025-09-17T13:19:38Z","timestamp":1758115178394},"reference-count":34,"publisher":"American Physiological Society","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["American Journal of Physiology-Gastrointestinal and Liver Physiology"],"published-print":{"date-parts":[[2011,7]]},"abstract":"<jats:p>The mechanisms of increased rectal stiffness in women with fecal incontinence (FI) and rectal urgency are not understood. Our hypothesis was that distention-induced activation of mechanosensitive L-type calcium channels in smooth muscle contributes to increased rectal stiffness in FI. Anal pressures, rectal distensibility (compliance, capacity, and contractile response to sinusoidal oscillation), and rectal sensation were assessed before and after oral nifedipine (30 + 10 mg) or placebo in 16 women with FI and 16 asymptomatic women. At baseline, FI patients had a lower anal pressure increment during squeeze (health, 66.9 \u00b1 7.6: FI, 28.6 \u00b1 5.9, mean \u00b1 SE, P \u2264 0.01), lower rectal capacity ( P = 0.052), and higher rectal pressures during sinusoidal oscillation (health, 13.7 \u00b1 3.2: FI, 21.7 \u00b1 1.4, mean \u00b1 SE, P = 0.02) than the healthy women, which suggests an exaggerated rectal contractile response to distention. Nifedipine decreased mean BP, increased heart rate ( P = 0.01 vs. placebo), and reduced anal resting pressure ( P \u2264 0.01) but did not significantly modify rectal distensibility in health or FI. Plasma nifedipine concentrations (health, 103 \u00b1 21 ng\/ml: FI, 162 \u00b1 34 ng\/ml) were correlated with increased rectal compliance ( r = 0.6, P = 0.02) in all study participants and, in healthy subjects, with decreased rectal pressures during sinusoidal oscillation ( r = 0.86, P = 0.01), indicative of reduced stiffness. No consistent effects on rectal perception were observed. These observations confirm that FI is associated with anal weakness and increased rectal stiffness. At therapeutic plasma concentrations, nifedipine reduced anal resting pressure but did not improve rectal distensibility in FI, outcomes that argue against a predominant contribution of myogenic L-type calcium channels to reduced rectal distensibility in FI.<\/jats:p>","DOI":"10.1152\/ajpgi.00557.2010","type":"journal-article","created":{"date-parts":[[2011,4,15]],"date-time":"2011-04-15T02:31:35Z","timestamp":1302834695000},"page":"G175-G180","source":"Crossref","is-referenced-by-count":10,"title":["Effect of nifedipine on anorectal sensorimotor functions in health and fecal incontinence"],"prefix":"10.1152","volume":"301","author":[{"given":"Adil E.","family":"Bharucha","sequence":"first","affiliation":[{"name":"Division of Gastroenterology and Hepatology, Department of Medicine and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jessica","family":"Edge","sequence":"additional","affiliation":[{"name":"Division of Gastroenterology and Hepatology, Department of 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