BlogLabel: PR interval

The first heart sound, part 2: loudness of S1
A lot of information is enciphered in heart sound.  There are two main problems:  it is difficult to perceive this sound because it is too faint, and it is not simple to interpret reaped information.  The later is some kind of understanding a foreign language.  Let us continue our talk about the language of the heart.
Learn about intensity of the first heart sound
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