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Value of the cuff leak test is limited

The Original Article was published on 23 September 2015

We read with interest the recent Critical Care review of post-extubation laryngeal edema and stridor resulting in respiratory failure [1]. We mostly agree with the authors’ opinion in that article except that the cuff leak test (CLT) was proposed as a standard extubation algorithm. We have two reasons to disagree.

First, although the CLT has been widely used for the prediction of post-extubation laryngeal edema, evidence for the predictive value of the CLT is conflicting. Most studies on the CLT document a high specificity and a low sensitivity, and this means that patients with a negative test have a low probability of developing post-extubation stridor (PES) but that patients with a positive CLT may not develop PES. In a recent systematic review, Ochoa et al. evaluated the accuracy of the CLT for reintubation secondary to upper airway obstruction; the sensitivity was 0.63 (95 % confidence interval (CI) 0.38–0.84), and the specificity was 0.86 (95 % CI 0.81–0.90) [2]. Shin et al. report that the CLT does not reliably identify those patients who will require reintubation in a trauma population [3]. Similarly, a recent study by Patel et al. demonstrates that the CLT or a combination with laryngeal parameters failed to accurately predict PES [4].

Second, the CLT is regarded as a simple and non-invasive procedure, but that does not mean this procedure is totally safe for patients. Ventilator-associated pneumonia (VAP) is one of the most frequent hospital-acquired infections and is associated with higher mortality, morbidity, and costs. Contaminated secretions that spill over the endotracheal tube cuff and leak down to the lungs are considered a significant pathogenic mechanism of VAP [5]. Although the related evidence is lacking, it is reasonable to posit that the CLT should increase the risk of oropharyngeal and subglottic secretions into the airway during cuff deflation and mechanical ventilation.

The poor predictive accuracy suggests that the CLT is an unstable clinical prognosticator, and we consider that the CLT should be applied for patients at high risk and that the excessive use of CLT is inappropriate.

Abbreviations

CI:

Confidence interval

CLT:

Cuff leak test

PES:

Post-extubation stridor

VAP:

Ventilator-associated pneumonia

References

  1. 1.

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Correspondence to Ling Zhao.

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Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

WW and LZ designed the manuscript and participated in drafting it. YZ, HST, and LS participated in drafting the manuscript. All authors read and approved the final manuscript.

See related review by Pluijms et al., http://www.ccforum.com/content/19/1/295

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Wang, W., Zhou, Y., Tong, Hs. et al. Value of the cuff leak test is limited. Crit Care 19, 446 (2015). https://doi.org/10.1186/s13054-015-1152-x

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Keywords

  • Respiratory Failure
  • Airway Obstruction
  • Endotracheal Tube
  • Predictive Accuracy
  • Clinical Prognosticator
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