pTracheal sounds have been the subject of many research studies. In this review, we describe the state of the art, original work relevant to upper airways obstruction during sleep, and ongoing research concerning the methods used when analysing tracheal sounds. Tracheal sound sensors are a simple and noninvasive means of measurement and are more reliable than other breathing sensors. Developments in acoustic processing techniques and enhancements in tracheal sound signals over the past decade have led to improvements in the accuracy and clinical relevance of diagnoses based on this technology. Past and current research suggests that they may have a significant role in the diagnosis of obstructive sleep apnoea./ph3Key points/h3pTracheal sounds are currently a topic of significant interest but are not yet used in most routine sleep study systems./ppMeasured at the suprasternal notch, tracheal sounds can provide reliable information on breathing sounds, snoring sounds and respiratory efforts./ppTracheal sounds may be used as a noninvasive method of studying abnormalities of the upper airways during wakefulness./ph3Educational aims/h3pTo understand the principles of tracheal sound measurement and analysis./ppTo highlight the importance of tracheal sounds for the diagnosis of sleep apnoea–hypopnoea syndrome./ppTo present the most relevant clinical studies that have validated the use of tracheal sound sensors and to make future clinical validation studies possible./p
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