Figure 231

Figure 23-2

Chest areas from which sound from each valve is best heard.

Figure 23-2

Amplitude of different-frequency vibrations in the heart sounds and heart murmurs in relation to the threshold of audibility, showing that the range of sounds that can be heard is between 40 and 520 cycles/sec. (Modified from Butterworth JS, Chassin JL, McGrath JJ: Cardiac Auscultation, 2nd ed. New York: Grune & Stratton, 1960.)

Chest areas from which sound from each valve is best heard.

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Essentials of Human Physiology

Essentials of Human Physiology

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