caa a22 4500 465783309 CHVBK 20180323112001.0 cr unu---uuuuu 170327e19901101xx s 000 0 eng 10.1007/BF02442606 doi (NATIONALLICENCE)springer-10.1007/BF02442606 Effect of air flow and flow transducer on tracheal breath sounds [Elektronische Daten] [M. Mussell, Y. Nakazono, Y. Miyamoto] Tracheal breath sounds (TBSs) were analysed in 12 normal adult subjects at the air flow levels of 1·6, 2·1 and 2·6 litre s−1, using a low-resistance flow transducer, and at an estimated flow of 2·1 litre s−1 without the flow transducer. The major findings were that the TBSs were significantly distorted by the flow transducer, but were independent of air flow. We therefore conclude that true TBSs can only really be recorded when an oral flow transducer is not used. The within-subject reproducibility of TBS was relatively good, while the cross-subject comparison of TBS showed that each subject produced their own unique spectral pattern, although the TBSs of normal subjects fall in a common frequency range. Also, inspiratory sounds were significantly lower in peak frequency than expiratory TBSs. IFMBE, 1990 Auscultation nationallicence Flow transducer nationallicence Lung sounds nationallicence Tracheal breath sounds nationallicence Mussell M. Department of Information Engineering, Faculty of Engineering, Yamagata University, 992, Yonezawa, Japan aut Nakazono Y. Department of Information Engineering, Faculty of Engineering, Yamagata University, 992, Yonezawa, Japan aut Miyamoto Y. Department of Information Engineering, Faculty of Engineering, Yamagata University, 992, Yonezawa, Japan aut Medical and Biological Engineering and Computing Kluwer Academic Publishers 28/6(1990-11-01), 550-554 0140-0118 28:6<550 1990 28 11517 https://doi.org/10.1007/BF02442606 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02442606 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mussell M. Department of Information Engineering, Faculty of Engineering, Yamagata University, 992, Yonezawa, Japan aut NATIONALLICENCE 700 1- Nakazono Y. Department of Information Engineering, Faculty of Engineering, Yamagata University, 992, Yonezawa, Japan aut NATIONALLICENCE 700 1- Miyamoto Y. Department of Information Engineering, Faculty of Engineering, Yamagata University, 992, Yonezawa, Japan aut NATIONALLICENCE 773 0- Medical and Biological Engineering and Computing Kluwer Academic Publishers 28/6(1990-11-01), 550-554 0140-0118 28:6<550 1990 28 11517 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer