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To the Editor:—
The sweeping statement of Douglas Macfarlan (The Journal, June 18, p. 2069) that "amplification of heart and lung sounds is neither practical, nor desirable, nor needed for the physician with normal hearing" should not remain unchallenged.Amplification has been made practical by several devices described in the literature:Beruti, J. A.: Semana méd.30:829, 1923.Duchosal, P., and Luthi, R.: Arch. méd. d. mal. du cœer22: 806, 1929.Sell, H.: Med. Klin.28: 150 (Jan. 29) 1932.Bierring, W. L.; Bone, H. C., and Lockhart, M. L.: Use of the Electrostethograph for Recording Heart Sounds, The Journal, Feb. 23, 1935, p. 628.Narat, J. K.: Illinois M. J. 70:131 (Aug.) 1936; Ztschr. f. Kreislaufforsch.29:313 (May 1) 1937.As to the desirability of the amplification, graphic recording of sounds is impossible without it. In turn, the importance of sound registration has been stressed
Narat JK. AMPLIFICATION OF HEART AND LUNG SOUNDS. JAMA. 1938;111(12):1123. doi:10.1001/jama.1938.02790380065024