The heart is the body's hardest-working muscle. Whether you're awake or asleep, or exercising or resting, your heart is always at work. It pumps blood through arteries to deliver oxygen to organs and ...
15don MSN
Maryland doctor explains why heart may suddenly beat very fast, shares what to do when it happens
SVT results in the heart beating at much faster rate than normal, and can be triggered by exercise, lack of sleep, ...
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