For recent acute urinary tract infection, acute urethritis, in order to prevent the spread of infection, sepsis and urethral fever is contraindicated for catheterization; due to urethral stenosis or other reasons manometric catheter can not be placed in the bladder; severe autonomic hyperreflexia, can not be catheterized, are prohibited cystometric examination: 1, imaging urodynamic examination for an invasive invasive examination, because the examination process requires catheterization, insertion of manometric catheter, the urethra is left in the catheter for a longer period of time, the following conditions may occur during and after examination Because of the need for catheterization during the examination, insertion of manometric catheters, and retention of manometric catheters in the urethra for a longer period of time, the following situations may occur during and after the examination: Before the examination, the patient must do the routine urinalysis and mid-stage urine culture, and if the results of the test suggest a urinary tract infection, it should be postponed until the results of the examination are normal, as appropriate, and then the urodynamic examination can be carried out. 2, intestinal preparation During the examination, because of the need to place the rectal manometry tube in the rectum to measure the pressure in the rectum, the patient needs to use 110 ml of glycerin enema enema once a day and night before the examination, to effectively remove the body’s persistent feces, and to eliminate intestinal gases, so as to obtain a stable and accurate curves and values during the examination. If the bowel is not adequately prepared for bowel cleansing, a large amount of intestinal gas will cause fluctuations in the manometry curve, the results of the curve of the pseudo-image, inaccurate values, blurred cystography imaging, and those who have not been purged of persistent feces to defecate during the examination process, the rectal manometry tube dislodgement, so that the examination fails, and so on. Skin preparation One day before the examination, the patient should be given a skin preparation for the perineum to prevent infection, facilitate the fixation of the catheter and electrode during the examination, and ensure the smooth completion of the examination. 4, drinking water preparation for patients who can urinate on their own, 1~2h before the examination, patients drink 300~500ml of water, patients are asked to hold their urine, and when they feel the need to urinate, the urine will be discharged into the measuring instrument to determine the urine flow rate. Urine flow rate measurement, try to make the urine volume more than 150ml, determination of free urine flow rate after catheterization to measure the residual urine. Patients who are paraplegic or cannot urinate on their own should avoid drinking too much water within 2h before the examination, and should be catheterized in the examination room before the examination. To ensure that the bladder is empty before the examination, to improve the quality and accuracy of the examination. Keep warm During the examination process, patients were given additional cover sheets and warmed bladder irrigation with saline and other measures to keep warm and prevent patients from catching cold and flu. If the patient has special needs and requirements, please inform the patient and his/her family in advance, or bring your own blankets and quilts for use.