Research: The Difference Between the Cannula and the Microphone for Diagnosing Snoring


The Laryngoscope has published a study, (Pérez-Warnisher et at., 2017) assessing the diagnostic accuracy of the cannula measuring snoring compared to the microphone, using the Nox T3 system.

Key findings

  • This study measured snoring using cannula and microphone. The results of the study showed that the diagnostic accuracy and reliability of the cannula, are poor, compared to the microphone.
  • The cannula-based method of diagnosing snoring is less effective compared to the microphone using the main variables estimating snoring severity. These variables are time and intensity.
  • The study included greater population than previous studies on the same subject, adding valuable evidence to the poor diagnostic accuracy of snoring with the cannula.


  • The study was a cross-sectional study including 75 patients undergoing home sleep test with the Nox T3 device.
  • Noxturnal was used to automatically produce the signals from the microphone and the cannula connected to the device.
  • Sensitivity, specificity, positive and negative likelihood ratios, and positive and negative predictive values were calculated for both methods. In addition, the correlation and the agreement between the two methods were assessed.

What this could mean?

  • This further enhances our previous statements that the microphone should be used to diagnose snoring rather than the cannula.

Pérez-Warnisher, M. T., Gómez-García, T., Giraldo-Cadavid, L. F., Troncoso Acevedo, M. F., Rodríguez Rodríguez, P., Carballosa de Miguel, P., & González Mangado, N. (2017). Diagnostic accuracy of nasal cannula versus microphone for detection of snoring. The Laryngoscope, 127(12), 2886–2890.

Link to the study: https://doi.org/10.1002/lary.26710

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Nox Medical
Nox Medical is a global leader in the sleep diagnostic technology space. The company provides sleep specialists with patient-friendly diagnostic devices and robust, reliable data collection. With easy-to-use medical device technology, Nox Medical eliminates common diagnostic pain points by prioritizing patient comfort and reliability of results, allowing providers to better assess, diagnose and treat the entire range of sleep health issues, including sleep apnea, circadian disorders and insomnia.