Atrial Fibrillation (AFIB) in the ICU: Incidence, Risk Factors, and Outcomes: The International AFIB-ICU Cohort Study

Area of Science:

• Critical Care Medicine
• Cardiology
• Epidemiology

Background:

• Atrial fibrillation (AF) is a common arrhythmia with significant implications for patient outcomes.
• Understanding the incidence, risk factors, and consequences of AF in the intensive care unit (ICU) is crucial for optimizing patient care.
• Current management practices for AF in the ICU setting require detailed assessment.

Purpose of the Study:

• To determine the incidence, identify risk factors, and evaluate the outcomes of atrial fibrillation (AF) in critically ill patients.
• To describe the current diagnostic and therapeutic strategies employed for managing AF in the ICU.
• To analyze the association between AF and patient outcomes, including mortality.

Main Methods:

• A multicenter, prospective, inception cohort study was conducted across 44 ICUs in 12 countries.
• 1,423 adult ICU patients without a history of persistent/permanent AF or recent cardiac surgery were enrolled.
• Data on AF episodes, interventions, and patient outcomes were collected and analyzed.

Main Results:

• The incidence of AF was 15.6%, with newly developed AF occurring in 13.3% of patients.
• Risk factors for AF included arterial hypertension, prior paroxysmal AF, sepsis, and high disease severity.
• Patients with AF experienced higher rates of ischemic events, thromboembolism, severe bleeding, and mortality (41.2% vs. 25.2%).

Conclusions:

• Atrial fibrillation is prevalent in ICU patients and associated with adverse outcomes.
• While AF correlated with worse outcomes, adjusted analyses did not show a statistically significant increase in 90-day mortality.
• Significant variations exist in the diagnostic approaches and management strategies for AF within ICUs.