Survival of indwelling urinary catheters in the elderly is not directly related to the indwelling catheter operation, i.e., indwelling urinary catheters in an aseptic state does not have any effect on the survival of the patient as long as they are not combined with urinary tract infection. Retained urinary catheter is usually a medical measure in emergency situations such as the treatment of urine retention or prostatic hyperplasia. The purpose is to drain the urine stored in the bladder out of the body through a catheter to avoid filling the bladder with urine, which can cause damage to the upper urinary tract or cause conditions such as infection. Retained urinary catheter can reduce the bladder capacity and improve the patient’s symptoms such as frequent and urgent urination and difficulty in urination, without any effect on survival. Survival is further determined by the heart, lung and brain function of the elderly, and the indwelling urinary catheter alone does not have any effect on survival.