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Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.

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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

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Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.

Blood flow before TIPS Blood flow before TIPS
kidney blood flow kidney blood flow
Mechanism involved in renal control of blood pressure Mechanism involved in renal control of blood pressure
The flow of blood valves of the heart. The flow of blood valves of the heart.
Renal blood vessels and the pathway of blood through the renal system. Renal blood vessels and the pathway of blood through the renal system.
Valves in veins prevent the backflow of blood Valves in veins prevent the backflow of blood
Video: Spinal Cord Injury Animation

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