Finding the right 'dose' for solar geoengineering

One of the key misconceptions about solar geoengineering—putting aerosols into the atmosphere to reflect sunlight and reduce global warming—is that it could be used as a fix-all to reverse global warming trends and bring ...

One enzyme dictates cells' response to a probable carcinogen: study

In the past few years, several medications have been found to be contaminated with NDMA, a probable carcinogen. This chemical, which has also been found at Superfund sites and in some cases has spread to drinking water supplies, ...

Chemists succeed in synthesis of aminoalcohols by utilizing light

Whether in beta-blockers to treat high blood pressure or in natural products, so-called vicinal aminoalcohols are high-quality organic compounds that are found in many everyday items. However, their production is difficult, ...

New study shows real-time stress reaction to racism

A new study by researchers from the University of Nebraska–Lincoln and University of Texas at Austin provides more evidence that the stress of racism contributes to health problems among people of color.

Which particulate air pollution poses the greatest health risk?

Researchers at the Paul Scherrer Institute (PSI), together with colleagues from several other European institutions, have investigated whether particulate matter from certain sources can be especially harmful to human health. ...

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Hypertension

Hypertension, also referred to as high blood pressure, HTN or HPN, is a medical condition in which the blood pressure is chronically elevated. In current usage, the word "hypertension" without a qualifier normally refers to systemic, arterial hypertension.

Hypertension can be classified as either essential (primary) or secondary. Essential hypertension indicates that no specific medical cause can be found to explain a patient's condition. About 90-95% of hypertension is essential hypertension. Secondary hypertension indicates that the high blood pressure is a result of (i.e., secondary to) another condition, such as kidney disease or tumours (adrenal adenoma or pheochromocytoma).

Persistent hypertension is one of the risk factors for strokes, heart attacks, heart failure and arterial aneurysm, and is a leading cause of chronic renal failure. Even moderate elevation of arterial blood pressure leads to shortened life expectancy. At severely high pressures, defined as mean arterial pressures 50% or more above average, a person can expect to live no more than a few years unless appropriately treated. Beginning at a systolic pressure (which is peak pressure in the arteries, which occurs near the end of the cardiac cycle when the ventricles are contracting) of 115 mmHg and diastolic pressure (which is minimum pressure in the arteries, which occurs near the beginning of the cardiac cycle when the ventricles are filled with blood) of 75 mmHg (commonly written as 115/75 mmHg), cardiovascular disease (CVD) risk doubles for each increment of 20/10 mmHg.

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