What is the rationale for inserting an indwelling catheter during lower abdominal surgery?

The rationale for inserting an indwelling catheter during lower abdominal surgery primarily revolves around the effects of anesthetics on bladder function. During surgery, anesthesia may affect the muscles of the bladder, particularly the detrusor muscle, which is responsible for bladder contraction. When under the influence of certain anesthetic agents, bladder contractility may be diminished, leading to difficulty in voiding post-surgery and increasing the risk of urinary retention.

Having an indwelling catheter in place ensures that urine is continuously drained, preventing any complications associated with a full bladder during the surgical procedure. Additionally, this helps maintain a sterile field and decreases the risk of infection, which is critical in a surgical setting. Understanding this mechanism highlights the importance of monitoring urinary function during anesthesia and the surgical process overall.