Do I have to insert a catheter for 2 hours under general anesthesia?

Whether the general anesthesia operation needs indwelling catheter, we decide according to the type of operation and the operation time. If the operation time is short, we can not indwell the catheter. If the operation time is longer than one hour, we generally need indwelling catheter. If the operation lasts more than two hours, we must indwell the catheter. The indwelling catheter for general anesthesia operation can understand the patient's urination situation at any time during the operation, whether the patient is short of water, and can also understand the kidney function by the way. There are urological surgery or colorectal cancer surgery, you can know whether there is hematuria, how much urine has been, can prompt whether there is tubal or ureteral damage, in addition to the reasons for the intraoperative indwelling catheter and long operation time urine can not be discharged, bladder overfilling, awake will affect urination work or even unable to urinate.