Table 1 Characteristics of ICU patients diagnosed with influenza

Demographic data

   Age (years) (median, IQR)

64, 48-70

   Male sex

20 (64.5)

Type of ICU

   Medical

21 (67.7)

   Surgical

10 (32.3)

Reason for admission to the ICU

   Severe respiratory failure

14 (45.1)

   Surgery

10 (32.2)

   Cardiac arrest

4 (12.9)

   Other^a

3 (9.6)

   APACHE II score

15, 12-17

Characteristics of influenza

   Days of symptoms before diagnosis (median, IQR)

3, 0-7

   Fever

22 (71)

   Cough

23 (74.2)

   Dyspnea

24 (77.4)

   Diarrhea

3 (9.7)

   Pneumonia

23 (74.2)

   Co-infection

8 (25.8)

   Unsuspected infection

15 (48.4)

   Hospital-acquired infection

13 (42)

Influenza virus

   H1N1v

27 (87)

   B

3 (9.7)

   H3N2

1 (3.2)

Complications

   Septic shock

13 (41.9)

   ARDS

16 (51.6)

   30-day mortality

9 (29)