New-onset atrial fibrillation and clinical outcome in non-cardiac intensive care unit patients.

Background: Data regarding new onset atrial fibrillation (nAF) in general, non-cardiac, intensive care unit (ICU) patients are limited. However, it has been suggested that nAF is associated with worse clinical outcome in these patients.

Objective: The purpose of the present work was to study the prognostic impact of nAF, in this setting.

Methods: We prospectively studied all patients admitted to a single ICU for a period of 12 months. Patients admitted for brief post-operative monitoring, patients with chronic, intermittent atrial fibrillation and atrial fibrillation present upon admission, were excluded. Death during ICU stay (ICUD) was the pre-specified study end-point. Length of stay (LOS) for survivors was also reported. A number of factors related to the occurrence of nAF and the present disease were recorded for each patient.

Results: The study population was comprised of 133 patients. Twenty (15%) of them manifested nAF. The end-point of ICUD was observed in 27.1% of the patients. The median LOS reported was 8 days. Patients with nAF seemed to have significantly worse prognosis, compared to those who did not manifest nAF (OR=3.35, 95%CI:1.26-8.92; P=0.016). Additionally, nAF patients appear to require significantly extended LOS (P=0.01). Nevertheless, when the effect of nAF on ICUD was adjusted for sepsis, there was no statistically significant difference between those that manifested nAF and the rest of the patients.

Conclusion: Patients suffering nAF seem to have worse prognosis during ICU stay. However, a direct impact of nAF on mortality was not documented.