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2024年2月25日 · What Is a Potassium Blood Test? Medically Reviewed by Jennifer Robinson, MD on February 25, 2024. Written by WebMD Editorial Contributors. What Is Potassium? Why Would I Get This Test? How Do I...
2023年11月3日 · 6 min read. You have hypokalemia when you have low levels of potassium in your blood. Potassium is a mineral your body needs to work normally. It helps muscles to move, cells to get the nutrients...
Causes. Hyperkalemia can happen if your kidneys don’t work properly and cannot remove potassium from your body or if you take certain medicines. Kidney disease is the most common cause of...
- Pathophysiology
- Function
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- Epidemiology
- Signs and symptoms
- Prognosis
We see through the cornea, which is the clear outer lens or \"windshield\" of the eye. Normally, the cornea has a dome shape, like a ball. Sometimes, however, the structure of the cornea is just not strong enough to hold this round shape and the cornea bulges outward like a cone. This condition is called keratoconus. Keratoconus is caused by a decr...
Tiny fibers of protein in the eye called collagen help hold the cornea in place and keep it from bulging. When these fibers become weak, they cannot hold the shape and the cornea becomes progressively more cone shaped.
Keratoconus appears to run in families. If you have it and have children, its a good idea to have their eyes checked for it starting at age 10. The condition progresses more rapidly in people with certain medical problems, including certain allergic conditions. It could be related to chronic eye rubbing.
Keratoconus usually starts in the teenage years. It can, though, begin in childhood or in people up to about age 30. It's possible it can occur in people 40 and older, but that is less common.
The changes in the shape of the cornea can happen quickly or may occur over several years. The changes can result in blurred vision, glare and halos at night, and the streaking of lights.
The changes can stop at any time, or they can continue for decades. There is no way to predict how it will progress. In most people who have keratoconus, both eyes are eventually affected, although not always to the same extent. It usually develops in one eye first and then later in the other eye. With severe keratoconus, the stretched collagen fib...
2023年11月7日 · Arteriosclerosis is a stiffening and thickening of blood vessels that can restrict blood flow to the heart and other organs. It's sometimes called hardening of the arteries. Atherosclerosis is a...
2023年8月3日 · What Is Anemia? Anemia is defined as a low number of red blood cells. In a routine blood test, anemia is reported as a low hemoglobin or hematocrit. Hemoglobin is the main protein in your red blood...
2023年11月15日 · 10 min read. If you see blood in your stool or toilet paper, you might be concerned. But while blood in stool can signal a serious problem, it isn't always the case. Here's what you need to know...
