Use of Tracheal Sound Recordings to Monitor Airflow During Sleep
Various methods have been used for continuous airflow monitoring during sleep, including the use of oral and nasal thermistors and the face mask pneumo- tachygraph. Recording of tracheal breath sounds has been proposed by Krumpe  and Cummiskey  for the detection and quantification of sleep apnea and hypopnea. Tracheal sound recording was compared only with the conventional method of thermistors but not with direct measurements of airflow using a pneumotachygraph.
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