Akasaka K, Konno K, Ono Y, Mue S, Abe C
Tohoku J Exp Med. 1975 Dec;117(4):323-33. doi: 10.1620/tjem.117.323.
Changes in the breathing sounds such as stridor and dry and wet rales in asthmatic patients were studied. The breathing sounds were recorded with the small transistor warp type microphone inserted through the nasal orifice into the trachea, main bronchi and segmental bronchi, and were analyzed with sound analyzer. The results were as follows: The whistling rales were caused by the resonance of the bronchial wall, when the vibrating frequency was coincident with its specific frequency. Snoring rales were explained as the sound caused by the air flow passing promptly through contracted bronchi with little secretion. Resonance of either bronchial wall or highly viscous sputum was considered to be responsible for the sonorous rales. Sibilant rales were audible when bronchi promptly repeated dilation and contraction. Stridor was picked up at the upper part of the air tract, from the main bronchus to the trachea, and noise was the main component on the sonogram, presumably caused by the air turbulence due to the narrowing and deformity of bronchial tube or to the sputum adhering to the inner surface of the air tract.
对哮喘患者呼吸音的变化，如喘鸣音、干湿啰音进行了研究。通过将小型晶体管弯型麦克风经鼻孔插入气管、主支气管和段支气管来记录呼吸音，并用声音分析仪进行分析。结果如下：哮鸣音是由支气管壁的共振引起的，当振动频率与其特定频率一致时。鼾音被解释为气流迅速通过几乎没有分泌物的收缩支气管时产生的声音。支气管壁或高粘性痰液的共振被认为是鼾音的原因。当支气管迅速反复扩张和收缩时可听到哮吼音。喘鸣音在气道上部，从主支气管到气管处被检测到，声谱图上以噪声为主，推测是由于支气管管腔狭窄和变形或气道内表面附着痰液导致的气流紊乱引起的。
