To compare outcome data of hemicolectomy patients before and after the establishment of a preoperative anaesthesia assessment clinic (PAC).

This observational study was conducted retrospectively through an electronic health record review covering periods before (2014–2017) and after (2017–2022) the PAC was established.

An acute care hospital in Norway.

A total of 612 patients undergoing elective open or laparoscopic hemicolectomy were included, of whom 338 (55.2%) had attended the PAC.

The primary outcome was the rate of cancellation of planned surgeries, and the secondary outcomes were length of hospital stay (LOS), unanticipated intraoperative anaesthesia-related events and the presence of documentation relevant to the planning of anaesthesia in the patient’s medical records preoperatively.

Compared with the after-PAC cohort, the before-PAC cohort was numerically more likely to have their planned surgery cancelled (OR=1.97, 95% CI (0.84 to 4.61); p=0.12). The before-PAC cohort also had a numerically lower rate of unanticipated intraoperative anaesthesia-related events (18.6%) than the after-PAC cohort (22.5%; p=0.240). However, neither of these differences was statistically significant. Median LOS was significantly shorter in the after-PAC cohort (4.79 days, IQR (3.80–6.12)) than in the before-PAC cohort (5.16 days (4.09–7.18); p=0.001). Moreover, the presence of documentation relevant to the planned anaesthesia in the medical records was significantly more common for after-PAC patients.

The establishment of the PAC reduced the rate of planned surgery cancellations but increased the rate of recorded intraoperative anaesthesia events. Patients who attended the PAC had a significantly shorter LOS and more anaesthesia-related information in their medical records.

NCT05520229.