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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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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

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By definition, when a medication is administered intravenously, its bioavailability is 100%.

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Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

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Anesthesia awareness is a potentially disturbing adverse effect wherein patients who have been paralyzed with muscle relaxants may awaken. They may be aware of their surroundings but unable to communicate or move. Neurologic monitoring equipment that helps to more closely check the patient's anesthesia stages is now available to avoid the occurrence of anesthesia awareness.

Wahkeena Falls at Columbia River Gorge in Oregon in the autumn. Wahkeena Falls at Columbia River Gorge in Oregon in the autumn.
The Old River Flood Control Structures The Old River Flood Control Structures
Chesapeake Bay: A Drowned River Valley Chesapeake Bay: A Drowned River Valley
Paul Cézanne, Mont Sainte-Victoire and the Viaduct of the Arc River Valley. Paul Cézanne, Mont Sainte-Victoire and the Viaduct of the Arc River Valley.
Map depicting the 2010 West Nile virus infections. Map depicting the 2010 West Nile virus infections.
V-shaped Valley of the Yellowstone River V-shaped Valley of the Yellowstone River
Video: Simple Diffusion - Ion transport

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