Altered Sounds of the Heart.'
THESE sounds are changed by disease in a variety of ways, both as to their character and duration. One or both sounds may be turned into a noise like the blowing of a pair of bellows. This is called the bellows sound. When this sound is very harsh, it may become like the noise of a rasp, or file, or saw. These altered sounds are au precluded by an altered condition of the valvular passages through which the blood passes. If you build an aqueduct of equal dimensions throughout, and smooth on the inside, you may send a certain volume of water through, at a given speed, without noise. But if you make sudden contractions in the aqueduct, or allow large stones to project into it, and then attempt to send through the same body of water, at the same rate of speed, you will hear all sorts of noises.
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