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Physiologic measuring instruments designed to detect, quantify, and give a real-time analysis of breathing sounds captured during a short span of time (e.g., 30 seconds). These instruments also measure the proportion of the respiratory cycle occupied by continuous high-pitched whistling noises (i.e., wheezing). These instruments typically consist of a handheld unit with on/off controls; an electronic processor with dedicated software; a display; and a detachable probe that includes a sound sensor which is placed on the patient\'s neck. Breathing sounds measuring instruments are used in healthcare facilities, in the field, and at home for a quick evaluation of the patient\'s status and to detect the presence of wheezing after drug (e.g., bronchodilator) administration.
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