Table 1. Clinical and epidemiological characteristics of the 135 patients studied, together with their ventilatory parameters.a .
| Variable | Total | Extubation success | Extubation failure | p |
|---|---|---|---|---|
| (n = 135) | (n = 90) | (n = 45) | ||
| Age, years | 47.80 ± 17.01 | 48.17 ± 17.50 | 49.82 ± 16.93 | 0.875b |
| Male gender, n (%) | 96 (71.10) | 66 (73.30) | 30 (66.70) | 0.561c |
| APACHE II score | 18.87 ± 5.41 | 18.20 ± 5.70 | 20.40 ± 4.40 | 0.024b |
| GCS at admission | 7.77 ± 2.14 | 7.94 ± 2.12 | 7.20 ± 2.16 | 0.79b |
| GCS score at extubation | 9.69 ± 1.12 | 10.07 ± 0.93 | 8.90 ± 0.51 | < 0.001b |
| PEEP, cmH2O | 5.27 ± 0.46 | 5.25 ± 0.45 | 5.31 ± 0.47 | 0.516 |
| FiO2, % | 34 ± 0.49 | 34 ± 0.41 | 34 ± 0.63 | 0.921b |
| VT, mL | 522 ± 134 | 535 ± 135.40 | 493 ± 121 | 0.180b |
| Duration of MV, daysd | 8.62 ± 5.70 | 7.21 ± 4.85 | 11.46 ± 6.26 | < 0.001d |
| MIP, cmH2Od | 65.22 ± 23.81 | 70.43 ± 22.30 | 54.80 ± 23.53 | < 0.001d |
| MEP, cmH2Od | 69.10 ± 43.87 | 75.65 ± 48.80 | 55.73 ± 27.59 | 0.003d |
| RSBI, breaths/min/Ld | 46.34 ± 17.79 | 43.86 ± 16.76 | 51.30 ± 18.92 | 0.028d |
| Reflex cough PEF | 102.09 ± 41.13 | 115.34 ± 38.95 | 75.76 ± 31.23 | < 0.001b |
APACHE II: Acute Physiology and Chronic Health Evaluation II; GCS: Glasgow Coma Scale; PEEP: positive end-expiratory pressure; VT: tidal volume; MV: mechanical ventilation; and RSBI: rapid shallow breathing index. aValues expressed as mean ± SD. bStudent's t-test. cPearson's chi-square test. dMann-Whitney test.