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Description:This study was performed on 37 guinea pigs. By histologic examination, it was revealed that when the muscle was stretched at the ARP plateau phase, an ischemic zone of necrosis and an edematous zone of necrosis could be clearly identified in the muscle. Anal stretching was conducted by an 8-F Foley catheter balloon. These results imply that the sphincteric muscle complex in high or intermediate anorectal anomalies may be injured during present conventional surgical approaches. This study shows that length of the external anal sphincter definitively influences muscle strengths, and severe anal stretching will result in muscle damage. It was found that if the muscle was stretched from to percent of its original length, anal resting pressure ARP kept relatively steady, but anal contracting pressure ACP gradually increased; from to percent, a sharp ARP increase was developed, but ACP gradually decreased to zero; beyond percent, ARP remained unchanged plateau phase.

Views: 6979 Date: 2018-03-24 Favorited: 82 favorites

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