Table 2: Reasons for unexpected overnight admissions (n=106).

ReasonNumber of Patients (%)

Long operation over 90 min19 (17.9%)

Drain26 (24.6%)

Left recovery after 18:3021 (19.8%)

Post-operative pain5 (4.7%)

Intra operative complications (small bowel injury)1 (0.9%)

Retention of urine7 (6.6%)

Other reasons (anaesthetic issues and social)21 (19.8%)

Required ERCP post-op (positive OTC)6 (5.7%)

Main reason for unplanned overnight stay as per clinician decision listed in the table. Some patients stayed overnight due to multiple reasons.