抄録
Thirteen patients with hypertrophic pyloric stenosis (H.P.S.) were studied preoperatively and seven were also examined following Ramstedt pyloromyotomy with real-time ultrasound (U.S.G.). For the diagnosis of H.P.S., it was important that the pyloric diameter≧14mm, muscle thickness≧3mm, stenotic index (S.I.=muscle thickness×2/pyloric diameter)≧50%, and morphological change and motility of antro-pyloric region were observed. Postoperative findings of the portion of pyloromyotomy was seen as "wedge sign" and it was difficult to see by 2 weeks after surgery. In comparison with preoperative finding and 7 days after surgery, S.I. was decreased from 52.6% to 35.3% and muscle thickness was from 3.8mm to 2.5mm. Postoperative vomiting were observed in the patients with the less decreasing rate of S.I.
