The influence of sex on early post-operative atrial fibrillation after cardiac surgery

Background Early post-operative atrial fibrillation (EPOAF) occurs more frequently in male (M) patients. However, most patients included in EPOAF studies were also M. The aim of the present study was to compare, in a matched M and F population, the occurrence of EPOAF episodes and EPOAF characteristics using continuous rhythm monitoring (CRM) during the first five post-operative days. Methods Our study population consisted of 30 F patients matched with 30 M patients admitted for elective cardiac surgery. After cardiac surgery, patients were continuously monitored for a maximum of 5 days, and the burden of EPOAF episodes was quantified. Results No significant differences in the onset, number, burden, total duration, shortest, median and longest EPOAF episode were detected between M and F patients. However, EPOAF occurred more frequently on the third post-operative day (F: 16 vs. M: 7; p = .013). Conclusions Except for the occurrence of the EPOAF on the third post-operative day. EPOAF characteristics did not differ between M and F patients.