Your privacy, your choice

We use essential cookies to make sure the site can function. We also use optional cookies for advertising, personalisation of content, usage analysis, and social media.

By accepting optional cookies, you consent to the processing of your personal data - including transfers to third parties. Some third parties are outside of the European Economic Area, with varying standards of data protection.

See our privacy policy for more information on the use of your personal data.

for further information and to change your choices.
Skip to main content

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.
Back to article page

Critical Care

ISSN: 1364-8535