Rectal and anal pressure variation during defecation in patients with acquired megacolon

Revista Brasileira de Coloproctologia

Capelhuchnik, Peretz¹  Fang, Chia Bin¹  Aguida, Helly Angela Caram¹  Klug, Wilmar Artur¹  Ortiz, Jorge Alberto¹ 

关键词: megacolon;    manometry;    achalasia;    defecation;    anal sphincter.;   

DOI  :  10.1590/S0101-98802007000300003

学科分类：心脏病和心血管学

来源: Sociedade Brasileira de Coloproctologia

【 摘 要 】

Megacolon is theresult of an extensive lesion of the mioenteric plexus, with lack of motor coordinationand achalasia of the anal sphincter. The motility disorder caused by the musclecontraction problems added to a mechanical obstacle results cause constipation.The defecation rectal pressure increases and reaches its peak with the startof fecal flow, exceeding the anal pressure. The objective of this work was toassess the ratio of rectal / anal pressure on 29 megacolon sufferers, comparedto normal subjects. Results have shown that defecation rectal pressure was higherthan expected for both men (72,2 ± 29,1 cm water) and women (64,5 ±20,1 cm water) exceeding the defecation anal pressure (66,4 ± 23,2 and62,1 ± 28,7 cm water, for men and women, respectively). The defecationpressures were much higher than those of the control group, what led to theconclusion that as an adaptive reaction, muscular effort increases to make evacuationpossible.

【 授权许可】

CC BY-NC