尿管結石の自然排出に要する期間についての一考察

ON SPONTANEOUS PASSAGE OF URETERAL STONE WITH REFERENCE TO ITS SIZE

はじめに

　尿管結石症ではかなりの比率で自然排石を期待し得るが，観血的摘出を余儀なくされるものも少なくない。しかし，尿路結石症の60〜85％が生涯のうち再発をみるとの報告^1,2）もあり，また再発防止のきめ手となる方法がない現在，観血的摘出はできるだけ避けたいところである。

　今回，われわれが過去4年間に経験した尿管結石症のうち，自然排石した症例の排出に要した日数を調べ，尿管結石の自然排石を得るためにはどの程度の期間待つのがよいか検討した成績を報告し，併せて本稿でtrihydroxypropiophenone （以下THPPと略す）の効果も検討した。

The relationship between the size of ureteral stone and the period in which the stone passed spon-taneously was studied in 321 cases. In addition, the effect of trihydroxypropiophenone was examined.

The results were as follows: A stepweise increase in the period of stone passage was observed, as the size of the stone was larger. The stone with a size less than 4 x 5 mm passed spontaneously within 2. 5 months.In the stones with a size between 4 x 5 mm and 6 x 9 mm, abruptly longer period was needed for spontaneous passage. As the size became larger than 7 x 9 mm, another abrupt increase of the period was observed.