A patient has just returned to the floor following a transurethral resection of the prostate. A triple-lumen indwelling urinary catheter has been inserted for continuous bladder irrigation. What, in addition to balloon inflation, are the functions of the three lumens?

Choice A reason: A triple-lumen catheter is specifically designed for continuous bladder irrigation following prostatic surgery. One lumen is dedicated to inflating the retention balloon, the second lumen allows for the continuous instillation of sterile irrigant into the bladder, and the third lumen provides a dedicated channel for the constant drainage of urine and irrigation fluid. Choice B reason: Intermittent inflow is incorrect because the primary goal of post-operative irrigation in a transurethral resection is to prevent the formation of blood clots that could obstruct the urethra. A continuous flow of solution is necessary to dilute blood and ensure that the catheter remains patent, preventing painful bladder distension and potential surgical site injury. Choice C reason: Intermittent outflow would be dangerous for a patient receiving continuous irrigation. If the fluid is constantly entering the bladder but only intermittently draining, the bladder would rapidly overdistend. This could cause significant pain, stimulate bladder spasms, and put excessive pressure on the prostatic fossa, which may lead to increased surgical bleeding or bladder rupture. Choice D reason: While the pressure of the balloon can help with the prevention of hemorrhage by applying traction to the surgical site, the lumens themselves are not "intermittent" in a standard continuous bladder irrigation setup. The scientific purpose of the multi-lumen system is to maintain a constant, high-volume fluid circuit to clear hematuria and debris effectively.