Treatment of disorders such as gastrointestinal tract (GI) perforation, ischemia and obstruction often require acute high-risk abdominal surgery, which is associated with a high risk of complications such as myocardial injury after non-cardiac surgery (MINS) and mortality. The majority of patients with MINS will not experience any symptoms, and thus MINS remains undetected without routine troponin measurements.

The investigators hypothesized that implementing surveillance with troponin I as a standard care might be useful as risk stratification, and that increased surveillance, examinations, and subsequent individually based medical interventions, might improve the outcomes for patients with MINS.

Inclusion Criteria:

• Eligible patients were 18 years or older
• Undergoing surgery for gastrointestinal perforation, obstruction, mesenterial ischemia or necrosis, or anastomotic leakage.

Exclusion Criteria:

• Not undergoing surgery for one of the conditions above

Patients undergoing acute high-risk abdominal surgery at Copenhagen University Hospital - North Zealand, Denmark during the period February 1, 2018, to February 28, 2021.

For patients undergoing acute high-risk abdominal surgery on more than occasion during the period of observation, only the first case of surgery was included.

IPD can be shared at request.