title: Pneumatic colon injury following high pressure blow gun dust cleaner spray to the perineum.
abstract: BACKGROUND
  A pneumatic tool or air tool such as blow gun dust cleaner is a tool driven by compressed air and spraying of the perineum can insufflate the colon due to its high pressure and high flow rate.
  
  
  METHODS
  We present a case of 4 year old boy who developed sudden onset of tense abdominal distention and developed peritonitis. Patient's family initially denied a history of trauma. Radiologic examination showed pneumoperitoneum and colon dilatation. Exploratory laparotomy revealed a tension pneumoperitoneum, bloody ascitic fluid, multiple site of ecchymosis and serosal tear of the colon and a minute perforation of transverse colon. Postoperative reinvestigation revealed that the patient's perineum was sprayed, using blow gun dust cleaner.
  
  
  CONCLUSIONS
  Air from pneumatic tools produces column of air at pressure of 3.5-8.8kg/cm(2) and pressure greater than the resting anal pressure of 0.109kg/cm(2) force air to enter the colon when the perineum is sprayed. Different degree of colon injury results when airflow is greater than 1.46L/m, and/or intraluminal pressure greater than 0.109kg/cm(2). In most children, initial anxiety to tell the truth result in difficulty to obtain good history.
  
  
  CONCLUSIONS
  Spraying of the perianal with excessive pneumatic force of greater than the resting anal pressure and high air flow rate causes multiple site colon injury and tension pneumoperitoneum due to colon perforation. Parent should be caution in children playing with high pressure pneumatic tool, and the importance of history is emphases for early correct diagnosis.
authors.affiliation: National Cheng Kung University Hospital, Tainan, Taiwan. Electronic address: edsy@mail.ncku.edu.tw.
authors.forename: Edgar D
authors.initials: ED
authors.lastname: Sy
authors.affiliation: National Cheng Kung University Hospital, Tainan, Taiwan.
authors.forename: Yin-I
authors.initials: YI
authors.lastname: Chiu
authors.affiliation: National Cheng Kung University Hospital, Tainan, Taiwan.
authors.forename: Yan-Shen
authors.initials: YS
authors.lastname: Shan
authors.affiliation: Department of Surgery, Sin Lau Christian Hospital, Tainan, Taiwan.
authors.forename: Roger L
authors.initials: RL
authors.lastname: Ong
keywords: Barotrauma; Colon injury