Verywell Health on MSN14 小时
What Is the Significance of an S1 Heart Sound?
Medically reviewed by Jeffrey S. Lander, MD The first heart sound, or S1, is the "lub" of a normal heartbeat. It's a ...
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Why Is My Heart Beating So Fast? 10 Potential Reasons and What to Do
Medically reviewed by Rafle Fernandez, MD Tachycardia is a rapid heart rate that beats faster than 100 beats per minute for ...