Abstract
Acute appendicitis is a global disease with high incidence. The main objective was to assess the association between time from admission to surgery (TAS) and surgery during emergency hours with operative outcome in light of conflicting evidence. This is a retrospective population-wide analysis of hospital billing data (2010-2021) of all adult patient records of surgically treated cases of acute appendicitis in Germany by TAS. The primary outcome was a composite clinical endpoint (CCE; prolonged length of stay, surgical site infection, interventional draining after surgery, revision surgery, intensive care unit admission and/or in-hospital mortality). Cases of complicated appendicitis were identified using diagnosis (ICD-10) and procedural codes (resection beyond appendectomy). 855,694 patient records were included, of which 27·6% (236,481) were complicated cases of acute appendicitis. 49·0% (418,821) were females and median age was 37 (interquartile range 22·5-51·5). Age, male sex, and comorbidity were associated with an increased proportion of CCE and in-hospital mortality. TAS was associated with a clinically relevant increase of CCE after 12 hours in complicated appendicitis (Odd's Ratio, OR, 1·19, 95% Confidence Interval, CI, 1·14-1·21) and after 24 hours in uncomplicated appendicitis (OR 1·10, CI 1·02-1·19). Beyond the primary endpoint, the proportion of complicated appendicitis increased after TAS of 72 hours. Surgery during emergency hours (6 pm - 6.59 am) was associated with an increase of CCE and mortality (OR between 1·14 and 1·49). Age, female sex, nighttime admission, weekend admission, a known previous surgery, obesity, and therapeutic anticoagulation were associated with delayed performance of surgery. This work found an increase of a CCE after TAS of 12 hours for complicated appendicitis and an increase of the CCE after TAS of 24 hours for uncomplicated appendicitis with a stable proportion of complicated appendicitis in these time windows. Both CCE and mortality were increased if appendectomy was performed during emergency hours.
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