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The familiar sounds of your heart are made by the heart's valves as they open and close.

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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.

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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.

These young children are taking the initiative to explore their environment as they examine a snail These young children are taking the initiative to explore their environment as they examine a snail
Cystoscopy. In this procedure, a specialized endoscope with a rigid tube, known as a cystoscope, is Cystoscopy. In this procedure, a specialized endoscope with a rigid tube, known as a cystoscope, is
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Video: Structures that affect circulation - venous return

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