吾人於48位臨床因腎臟或上端輸尿管結石接受體外波碎石術治療之病人進行一前瞻性之研究，觀察其術前術後糞便潛血出現之情形。結果發現潛血現象可出現於53％左側腎結石，27％兩側腎結石及11％右側腎結石病人術後之糞便中，表示約三分之一的病人於接受體外震波碎石術治療後均可因腸胃道受損而在糞便中出現潛血現象。此現象之出現與否與病人之體重無關，卻與所接受之震波次數及強度有直接相關性，震波次數愈多，強度愈強，所產生糞便潛血之機會也愈高。左腎有較高之機會主因胃部含大量液體及空氣且位於左側所致。此種潛血現象一般皆可在48小時內消失，表示腸胃道黏膜之傷害是短暫且可復原的。據我們所知，止乃首度提出利用偵測糞便潛血之方式體外震波碎石術所引發腸胃道傷害程度之報告。

A prospective study was conducted to evaluate the occurrence of occult blood in the faces in 48 patients after receiving extracoporeal shock-wave lithotripsy (ESWL) treatment. This study showed that occult blood in the feces could develop in 53 per cent of patients (10/19) with left renal stones, in 27 per cent (3/11) with bilateral renal stones, and in 11 per cent (2/18) with right renal stones. There was no direct relation between the patients's weight and the development of occult blood in the feces. The incidence of occult blood in the feces was closely related to the number and intensity of shock waves. Higher intensity of energy given, but to the anatomic position and gas-fluid effect of the stomach. The presentation of occult blood lasted less than 48 hours and was reversible. To our knowledge, this is the first repost in literature on the detection of ESWL-induced gastrointestinal damage with occult blood in the feces int clinical patients. (J Urol R.O.C., 1:264-268, 1990)