Acoustic monitoring of double-lumen ventilated lungs for the detection of selective unilateral lung ventilation

Shai Tejman-Yarden, Dror Lederman, Israel Eilig, Alexander Zlotnik, Nathan Weksler, Arnon Cohen, Gabriel M. Gurman

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


One-lung intubation (OLI) is among the most common complications of endotracheal intubation. None of the monitoring tools now available has proved effective for its early detection. In this study we investigated the efficacy of acoustic analysis for the detection of OLI. We collected lung sounds from 11 patients undergoing thoracic surgery requiring the placement of a double-lumen tube. Recordings of separate lung ventilation were performed after induction and confirmation of adequate tube positioning, before surgery. Samples of lung sounds were collected by three piezoelectric microphones, one on each side of the chest and one on the right forearm, for background noise sampling. The samples were filtered, the signals' energy envelopes were calculated, and segmentation to breath and rest periods was performed. Each respiration was classified into one of the three categories: bilateral ventilation, selective right-lung ventilation, or selective left-lung ventilation, on the basis of the ratio between the energy signals of each lung. OLI was accurately identified in 10 of the 11 patients during right OLI and in all 11 patients during left OLI. This study suggests that acoustic monitoring is effective for the detection of selective lung ventilation and may be useful for early diagnosis of OLI.

Original languageEnglish
Pages (from-to)1489-1493
Number of pages5
JournalAnesthesia and Analgesia
Issue number6
StatePublished - 1 Dec 2006
Externally publishedYes


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