Raw data for the article: Risk factors for surgical site infection following cardiac surgery in a region endemic for multidrug resistant organisms

<p><strong>Objectives:&nbsp;</strong>To identify risk factors for surgical site infections following cardiosurgery in an area endemic for multidrug resistant organisms.</p> <p><strong>Design:&nbsp;</strong>Single-center, historical cohort study including patients who underwent cardiosurgery during a 6-year period (2014-2020).</p> <p><strong>Setting:&nbsp;</strong>Joint Commission International accredited, multiorgan transplant center in Palermo, Italy.</p> <p><strong>Main outcome measures:&nbsp;</strong>Surgical site infection was the main outcome.</p> <p><strong>Results:&nbsp;</strong>On a total of 3609 cardiosurgery patients, 184 developed surgical site infection (5.1 %). Intestinal colonization with multidrug resistant organisms was more frequent in patients with surgical site infections (69.6 % vs. 33.3 %; p &lt; 0.001). About half of surgical site infections were caused by Gram-negative bacteria (n = 97; 52.7 %). Fifty surgical site infections were caused by multidrug resistant organisms (27.1 %), with extended-spectrum Beta-lactamase-producing Enterobacterales (n = 16; 8.7 %) and carbapenem-resistant Enterobacterales (n = 26; 14.1 %) being the predominant resistance problem. However, in only 24 of surgical site infections caused by multidrug resistant organisms (48 %), mostly carbapenem-resistant Enterobacterales (n = 22), a pathogen match between the rectal surveillance culture and surgical site infections clinical culture was demonstrated. Nevertheless, multivariate logistic regression analysis identified a rectal swab culture positive for multidrug resistant organisms as an independent risk factor for SSI (odds ratio 3.95, 95 % confidence interval 2.79-5.60). Other independent risk factors were female sex, chronic dialysis, diabetes mellitus, previous cardiosurgery, previous myocardial infarction, being overweight/obese, and longer intubation time.</p> <p><strong>Conclusion:&nbsp;</strong>In an area endemic for carbapenem-resistant Enterobacterales, intestinal colonization with multidrug resistant organisms was recognized as independent risk factor for surgical site infections.</p> <p><strong>Implications for clinical practice:&nbsp;</strong>No causal relationship between colonization with resistant pathogens and subsequent infection could be demonstrated. However, from a broader epidemiological perspective, having a positive multidrug resistant organisms colonization status appeared a risk factor for surgical site infections. Therefore, strict infection control measures to prevent cross-transmission remain pivotal (e.g., nasal decolonization, hand hygiene, and skin antisepsis).</p>