Table 1.
baseline characteristics
| Demographic data | Value |
|---|---|
| Age (mean ± SD, years) | 66.48 ± 16.7 |
| Genders Male (n/%) | 38/61 |
| Body mass index (mean ± SD, kg/m2) | 22.5 ± 6.3 |
| Medical patients (n/%) | 42/68 |
| Surgical patients (n/%) | 20/32 |
| APACHE II score (mean ± SD) | 18.5 ± 7.2 |
| Comorbidity (n/%) | |
| Hypertension | 35/57 |
| Diabetes | 21/34 |
| Chronic kidney disease | 18/29 |
| Ischemic heart disease | 14/23 |
| COPD | 6/10 |
| Hypothyroid | 5/8 |
| Adrenal insufficiency | 3/5 |
| Asthma | 2/3 |
| Reason for intubation (n/%) | |
| Neurological disease | 10/16 |
| Septic shock | 10/16 |
| Pneumonia | 8/13 |
| Heart disease | 8/13 |
| COPD exacerbation | 4/7 |
| Post-operative conditions | 21/34 |
| Laboratory findings (mean ± SD) | |
| Sodium (mmol/L) | 135.9 ± 5.2 |
| Potassium (mmol/L) | 3.9 ± 0.59 |
| Bicarbonate (mmol/L) | 23.6 ± 4.5 |
| Calcium (mmol/L) | 7.9 ± 0.65 |
| Magnesium (mmol/L) | 1.97 ± 0.37 |
| Phosphate (mmol/L) | 4.6 ± 5.4 |
| Albumin (g/dl) | 24.8 ± 5.6 |
| BUN (mg/dl) | 29.3 ± 23.9 |
| Creatinine (mg/dl) | 1.9 ± 2.3 |
| Hematocrit (%) | 31.8 ± 5.5 |
| Vital capacity (mean ± SD, L) | 0.97 ± 0.4 |
| Tidal volume (mean ± SD, L) | 0.41 ± 0.2 |
| PIMAX (mean ± SD, mmHg) | 40.7 ± 16.4 |
| RSBI (mean ± SD, breath•min− 1/L) | 60.2 ± 33.1 |
| Duration of mechanical ventilation(days) a | 2.8(1.1–5.7) |
| Length of stay (days) | |
| Intensive care staya | 4.8 (2.9–9.6) |
| Hospital staya | 13.3 (7.8–25.9) |
APACHE II Acute Physiology and Chronic Health Evaluation II, COPD chronic obstructive airway disease, BUN blood urea nitrogen, PIMAX Maximum peak inspiratory pressure, RSBI Rapid shallow breathing index
apresent as median (inter quartile range)