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Table 1 Accuracy of the f/VT ratio to predict weaning outcome in different studies

From: Weaning from mechanical ventilation

   

Likelihood ratio (95% Cl)

Post-test probability of weaning success (%)

Reference

Patients

Pretest probability of weaning success (%)

Positive*

Negative†

Positive*

Negative†

[6]

64 Medical patients

56

2.72 (1.50-5.17)

0.04 (0.00-0.37)

77 (65-87)

5 (0-32)

[10]

100 Medical patients

63

1.49 (1.04-2.35)

0.27 (0.08-0.88)

72 (64-79)

31 (12-60)

[11]

185 Postoperative patients

92

1.45 (1.07-2.56)

0.09 (0.02-0.54)

94 (92-97)

51 (17-86)

[12]

49 Medical patients (aged >70 years)

77

2.70 (0.93-11.7)

0.36 (0.15-1.10)

90 (76-97)

55 (33-79)

  1. Results are expressed as likelihood ratio. *Positivetest result is a value of rapid shallow breathing index (f/VT) lower than 105or 100; †negative test result is a value of f/VT higher than105 or 100.
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Critical Care

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