We studied the effect of externally applied vibration onto the abdominal wall on the efficiency of peritoneal dialysis (PD). Ten patients were studied. Three consecutive PD exchanges (control sessions, CS) were compared with vibration sessions (VS). Samples of blood and dialysate were analyzed for urea nitrogen (UN), creatinine (Cr) and potassium (K). Mean clearance was calculated. We found that vibration increased significantly the mean UN, Cr and K clearances.