Akervall S, Fasth S, Nordgren S, Oresland T, Hultén L
Department of Surgery II, University of Göteborg, Sahlgrenska sjukhuset, Sweden.
Gut. 1988 May;29(5):614-23. doi: 10.1136/gut.29.5.614.
A new technique for manovolumetric investigation of rectoanal function allowing for simultaneous recording of rectal volume, anal pressure and external sphincter EMG in response to graded rectal distension was developed. Distension pressure was generated by a water column between two reservoirs. Volume was recorded as shifts of water between the reservoirs. Anal pressure was recorded with a cylindrical balloon and electromyographic activity of the external sphincter by means of a needle electrode. It could be shown that although reduction of preset pressure was minimal, this factor had to be taken into account when rectal compliance is high. The position of the patients during the investigation has to be defined, because rectal volume changed with body position. Pull through studies of anal pressure indicated low sensitivity to displacement of the cylindrical anal probe. A pressure adaptation to the anal probe during eight minutes was noted. Representative recordings of the anorectal response to different isobaric pressures are presented. The present system offers new possibilities for investigation of rectoanal physiology in man.
开发了一种用于直肠肛门功能压力容积测定研究的新技术，该技术能够在分级直肠扩张时同步记录直肠容积、肛门压力和外括约肌肌电图。扩张压力由两个储液器之间的水柱产生。容积通过储液器之间水的移动来记录。肛门压力用圆柱形气囊记录，外括约肌的肌电活动通过针电极记录。结果表明，尽管预设压力的降低很小，但在直肠顺应性较高时必须考虑这一因素。检查期间患者的体位必须明确，因为直肠容积会随体位变化。肛门压力的牵拉研究表明，对圆柱形肛门探头的移位敏感性较低。观察到在八分钟内压力适应了肛门探头。给出了对不同等压压力的肛肠反应的代表性记录。本系统为人体直肠肛门生理学研究提供了新的可能性。
