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Table 1 Outcomes of ICU patients with new-onset atrial fibrillation (NOAF) on the first day of admission and those without NOAF

From: New-onset atrial fibrillation can be falsely associated with increased length of stay in ICU due to immortal time bias

Characteristic

New-onset atrial fibrillation on day 1 (n = 962)

No atrial fibrillation (n = 13,473)

Adjusted odds ratioc (95% CI)

P value

In-hospital mortality, n (%)

367 (38.1)

4034 (29.9)

1.03 (0.95–1.11)

0.34

Persistent atrial fibrillation, n (%)b

238 (24.7)

–

  

ICU length of stay, days, median (IQR)

7 (2–14)

6 (2–9)

 

< 0.01

Hospital length of stay, days, median (IQR)

14 (6–27)

12 (4–25)

 

< 0.001

Ventilator-free days, median (IQR)

6 (2–8)

6 (4–10)

 

0.08

  1. Abbreviations: ICU intensive care unit, IQR interquartile range
  2. aOnly includes patients surviving to discharge
  3. bDefined as the presence of any atrial fibrillation following 24 h of treatment
  4. cRatio of NOAF to patients with no atrial fibrillation
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Critical Care

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