Sonographic Investigation of the Rectoanal Inhibitory Reflex: A Qualitative Pilot Study in Healthy Females.
PURPOSE: The rectoanal inhibitory reflex has been studied using various methods, e. g., anometry and electromyography. The aim of this study was to apply ultrasound for direct visualization of the rectoanal inhibitory reflex. METHOD: The rectoanal inhibitory reflex was induced in ten healthy females (age range, 21 - 55 years) by injection of small amounts of water (7, 12, and 20 ml), into the rect