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Extracorporeal circulation auxiliary to open-heart surgeries (ECAOHS) may exert nonphysiological stresses on periapical abscessed tissues leading to hematogenous spread of microbes. The aim of this report was to estimate risk of postoperative infectious complications in patients with periapical abscesses and undergoing ECAOHS.A retrospective analysis of Nationwide Inpatient Sample (years 2009 and 2010) was conducted. All patients (aged 19 to 65 years) who underwent ECAOHS were selected. International Classification of Diseases-9-Clinical Modification codes were used to identify the presence of periapical abscess and infectious complications. Multivariable logistic regression models were used to examine the associations between the presence of periapical abscess and occurrence of infectious complications.A total of 265,235 patients underwent an ECAOH procedure. Of these, 431 patients had a periapical abscess. Septicemia developed in 16% of those with periapical abscess (compared with 4.2% in those without periapical abscess). Those with periapical abscess had higher rates of any of the infectious complications when compared with those without periapical abscess (30.2% vs 11.6%, respectively). After adjustment for multiple confounders, those with periapical abscess were associated with higher odds for developing septicemia (odds ratio = 2.51, 95% confidence interval = 1.06-5.91, P = .04) and any of the infectious complications (odds ratio = 2.23, 95% confidence interval = 1.08-4.59, P = .03) when compared with those who did not have periapical abscess.Those with periapical abscess are associated with higher odds for infectious complications when compared with those without periapical abscess.