Physical diagnosis, including diseases of the thoracic and abdominal organs : a manual for students and physicians .. . ity, its relation to the chest wall and the connectingbronchus. The si an is not often detected, but whenpresent is diagnostic of a cavity. Friedrichs Eespiratory Change of Sound.—This is noted when percussion is made during forcibleinspiration and expiration, and is dependent upon thechanges that occur in the size of the cavity and thetension of its walls. The Cracked-Pot Sofxd.—This is a peculiarclinking sound heard when, during expiration with themouth open, forcible percu
Physical diagnosis, including diseases of the thoracic and abdominal organs : a manual for students and physicians .. . ity, its relation to the chest wall and the connectingbronchus. The si an is not often detected, but whenpresent is diagnostic of a cavity. Friedrichs Eespiratory Change of Sound.—This is noted when percussion is made during forcibleinspiration and expiration, and is dependent upon thechanges that occur in the size of the cavity and thetension of its walls. The Cracked-Pot Sofxd.—This is a peculiarclinking sound heard when, during expiration with themouth open, forcible percussion is made over a cavityconnectine; directlv with bronchus and is most easilyobtained when the cavity is situated in the upper portionof the lung and the chest walls are flexible. This soundcan be imitated bv looselv clasping the hands withpalmar surfaces slightly touching and forcibly striking 94 THE RESPIRATORY SYSTEM. the back of one hand on the knee, thus forcing the airthrough the narrow chink formed. This sound whilemost frequently found in cavity formation may be pro- Fig. 28. Normal Dulness Flatness. Impaired Normal Variation in sound caused by changes in pulmonary tissue as elicited by the force of percussion blow. duced by forcible percussion in the normal lung whenthe thorns is very elastic, as in children. PERCUSSION. 95 Decrease in Size.—As the pulmonary resonance isdue to the air contained in the lung, diminution in theamount will be attended by a corresponding decrease of Fig. 29.
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