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The necessary sterile equipment and the prescribed irrigant are assembled. The patient is covered with draping to preserve privacy and maintain antisepsis, and provided with information about how the procedure is done and what sensations will be experienced. A triple-lumen indwelling catheter is inserted into the urinary bladder via the urethra; placement is confirmed by the flow of urine, and the anchoring balloon inflated via its lumen. The prescribed volume of irrigant is instilled via the irrigation lumen; the catheter is clamped to allow the solution to remain in the bladder for the prescribed period of time; then the catheter is unclamped to allow the irrigant to flow out of the bladder via the drainage lumen by gravity into a collecting basin or closed drainage system. The irrigation is repeated the prescribed number of times. The character of the irrigation solution returned and the presence of any mucus, blood, or other material visible in the drainage is noted. The catheter is removed as per practitioner order. The time of the procedure, the type and volume of irrigant instilled, the type and volume of return, and the patient's response to the procedure are documented. If intermittent or continuous bladder irrigation is required, the catheter remains in place. Two large bags of irrigating fluid on a Y tubing are hung for continuous irrigation, with flow-rate controlled to maintain clear drainage. Urine output is determined by subtracting the amount of irrigant instilled from the total drainage obtained.