Table 3.
Accuracy of D-RSBI and RSBI in predicting weaning failure
| Index | Threshold | AUC (95 % CI) | P value | Sensitivity (95 % CI) | Specificity (95 % CI) | PPV | NPV | Likelihood ratio | |
|---|---|---|---|---|---|---|---|---|---|
| Positive | Negative | ||||||||
| DD | ≤14 | 0.82 (0.69–0.92) | <0.0001 | 88.2 (63.6–98.5) | 61.8 (43.6–77.8) | 53.6 | 91.3 | 2.3 (1.5–3.7) | 0.2 (0.05–0.7) |
| D-RSBI | >1.3 | 0.89 (0.76–0.95) | <0.0001 | 94.1 (71.3–99.9) | 64.7 (46.5–80.3) | 57.1 | 95.6 | 2.7 (1.7–4.3) | 0.1 (0.01–0.6) |
| RSBI | >62 | 0.72 (0.57–0.83) | 0.011 | 52.9 (27.8–77.0) | 97.1 (84.7–99.9) | 90.1 | 80.5 | 18.0 (2.5–130.7) | 0.5 (0.3–0.8) |
| RR | >20 | 0.76 (0.62–0.87) | <0.001 | 64.7 (38.3–85.8) | 76.5 (58.8–89.3) | 57.9 | 81.3 | 2.8 (1.4–5.5) | 0.5 (0.2–0.9) |
| MIP | ≥25 | 0.70 (0.56–0.82) | 0.008 | 76.5 (50.1–93.2) | 67.7 (49.5–82.6) | 54.2 | 85.2 | 2.4 (1.4–4.1) | 0.4 (0.1–0.8) |
AUC area under curve, CI confidence interval, DD diaphragmatic displacement, D-RSBI diaphragmatic rapid shallow breathing index, MIP maximum inspiratory pressure, NPV negative predictive value, PPV positive predictive value, RR respiratory rate, RSBI rapid shallow breathing index (RR/tidal volume)