Table 4 Clinical characteristics in the respiratory failure and extubation success subgroups
| Â | Respiratory failure subgroup | Extubation success subgroup | ||
|---|---|---|---|---|
Variables | RI subgroup | NI subgroup | RI subgroup | NI subgroup |
N (cases) | 10 | 19 | 4 | 27 |
Demographic factors: | ||||
 Age (yrs) | 70.1 ± 21.5 | 71.2 ± 12.2 | 70.0 ± 11.5 | 61.2 ± 23.3 |
 Male | 6 (60) | 12 (63) | 4 (100) | 13 (48) |
 BMI (kg/m2) | 21.6 ± 4.1 | 25.9 ± 5.4* | 23.9 ± 1.1 | 24.4 ± 4.5 |
Comorbidities: | ||||
 Chronic respiratory diseasesa | 7 (70) | 12 (63) | 1 (25) | 6 (22) |
 Coronary heart disease | 5 (50) | 11 (58) | 1 (25) | 6 (22) |
 Myocardial infarction | 2 (20) | 9 (47) | 1 (25) | 5 (19) |
 Hypertension | 5 (50) | 12 (63) | 3 (75) | 16 (59) |
 Atrial fibrillation | 4 (40) | 4 (21) | 0 (0) | 3 (11) |
 Diabetes | 2 (20) | 6 (32) | 2 (50) | 8 (30) |
 Renal dysfunction | 6 (60) | 5 (26) | 3 (75) | 9 (33) |
 Cerebral vascular diseasesb | 4 (40) | 2 (11) | 1 (25) | 3 (11) |
Clinical characteristics: | ||||
 APACHE II | 26.2 ± 6.4 | 22.7 ± 3.0 | 24.0 ± 5.0 | 19.3 ± 6.4 |
 Duration from onset to the first intubation (d) | 9.0 ± 7.0 | 5.0 ± 3.4 | 1.0 ± 0.8 | 4.0 ± 4.0* |
 Duration of the first intubation to extubation (d) | 13.6 ± 9.6 | 8.7 ± 4.4 | 5.8 ± 3.0 | 7.4 ± 4.9 |
 RR (breaths/min) | 22.5 ± 5.6 | 21.2 ± 3.5 | 23 ± 6.7 | 21.3 ± 4.4 |
 VT (l) | 0.40 ± 0.12 | 0.44 ± 0.12 | 0.38 ± 0.09 | 0.41 ± 0.09 |
 RSBI | 63.9 ± 33.1 | 51.6 ± 12.8 | 63.9 ± 29.0 | 54.8 ± 21.3 |
 GCS | 12.4 ± 3.6 | 14.0 ± 1.0 | 13.5 [13-14] | 13.9 [13-15] |
 WBC (×109/l) | 8.5 ± 4.1 | 10.6 ± 3.6 | 8.8 ± 3.7 | 11.3 ± 5.8 |
 Hemoglobin (g/l) | 87.2 ± 12.0 | 111.5 ± 23.3* | 81.0 ± 16.8 | 90.6 ± 14.0 |
 Albumin (g/l) | 28.9 ± 5.1 | 28.8 ± 3.9 | 25.3 ± 3.3 | 28.0 ± 3.9 |
 Plasma creatinine (micromole/l) | 134.9 ± 83.0 | 113.0 ± 70.7 | 155.4 ± 90.5 | 109.4 ± 79.0 |