Risk stratification of non-cardiac surgeries in adult congenital heart disease

Abstract Background Adults with congenital heart disease (ACHD) face multiple surgeries throughout their lifetime. Data on the specific risk of undergoing non-cardiac surgery and impact of severity of ACHD on outcome are limited. We aimed to assess frequency and outcome of non-cardiac surgery and to identify ACHD patients specifically at risk. Methods Based on data including all hospital admissions in Germany from 2011 to 2018, we identified all ACHD cases that were admitted for non-cardiac surgery. Non-cardiac surgery was categorized in low-, medium and high-risk based on a clinically implemented risk score validated for non-congenital cardiac patients. The analyzed data contained information on patient demographics, diagnoses, in-hospital complications, and mortality. The primary endpoints of the study were major adverse cardiovascular events (MACE), major infection, major bleeding, thromboembolism and in-hospital death. Outcomes of ACHD were compared to a propensity score matched cohort of non-ACHD. Results Overall, 13,041 ACHD inpatient cases were included in the analysis (simple n=9,333 (72%), moderate n=2,741 (21%), and complex heart defects n=966 (7%)). 23.0% simple ACHD underwent low-risk surgery, whilst 31.1% were intermediate and 45.0% high-risk procedures. In the medium complexity ACHD cohort, 35.8% received low-risk, 42.3% intermediate risk and 21.8% high-risk surgery. In complex ACHD, 42.4% underwent low-risk, 41.2% intermediate risk and 16.4% high-risk surgery. Simple ACHD more frequently presented with typical cardiovascular risk factors such as dyslipidemia, arterial hypertension and diabetes mellitus compared to moderately and severely complex ACHD at time of non-cardiac surgery (p