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hair_loss_types : Types of hair loss and their causes

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hair_loss_types : Types of hair loss and their causes posted by ena-oopi
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Different types of hair loss are caused by different things. Here is a look at various types and their causes.

  • Androgenetic Alopecia: This is by far the leading type of hiar loss in men and women and is a result of genetics. This genetic hair loss is hereditary and can be inherited from either side of the family. Commonly known as male and female pattern baldness, this type of hair (the stuff that grows on the top of your head) loss is due to the action of a chemical known as dihydrotestosterone (DHT) which attacks the hair follicles and causes hair loss.
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  • Telogen Effluvium: This condition is also referred to as diffuse hair loss. In this type of hair loss, a lot of hair is lost in a short span of time. Leading causes for this condition are pregnancy, chemotherapy for cancer treatment, very high fevers, severe illnesses, and sometimes even high levels of stress can result in telogen effluvium. This is not a permanent condition and most of the lost hair does grow back within a few months.
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  • Alopecia Areata: Any sudden loss of hair resulting in bald patches is the condition of alopecia areata. This is an autoimmune disesase where the hair follicles are attacked by the body. Why it happens has not yet been discovered. It can be a mild case and result in bald patches on the head or if it is severe it can affect the entire body hair. This condition usually treats itself without any medication although some doctors may prescribe certain steroid injections for repeated occurrence of localized alopecia areata.
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  • Traction Alpoecia: This type of hair loss occurs in people who routinely pull on their hair through harsh brushing or hairstyles such as a tight ponytail that pull on the hair. One prime example of this condition is the braided hair popular with African-americans.
  • Medication Related Hair Loss: Certain medicines such as accutane, allopurinol, and anti-thyroid medicines are known to cause hair loss.
  • Diet Related Hair Loss: Temporary hair loss and hair shedding can result from poor nutrition and an unbalanced diet. If your body is deficient in certain minerals, vitamins, and/or iron, it can cause you to lose hair.
    • Thallium_Stress_Test : Thallium Stress Test posted by uteu
    hair_loss_types
    What is a thallium stress test?

    This is a type of nuclear scanning test or myocardial perfusion (mi"o-KAR'de-al per-FU'zhun) imaging test. It shows how well blood flows to the heart muscle. It's usually done along with an exercise stress test on a treadmill or bicycle.

    The thallium stress test is useful to determine:

    - Extent of a coronary artery blockage

    - Prognosis of patients who've suffered a heart attack

    - Effectiveness of cardiac procedures done to improve circulation in coronary arteries

    - Cause(s) of chest pain

    - Level of exercise that a patient can safely perform

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    When the patient reaches his or her maximum level of exercise, a small amount of a radioactive substance called thallium is injected into the bloodstream. Then the patient lies down on a special table under a camera ("gamma camera") that can see the thallium and make pictures. The thallium mixes with the blood in the bloodstream and heart's arteries and enters heart muscle cells. If a part of the heart muscle doesn't receive a normal blood supply, less than a normal amount of thallium will be in those heart muscle cells.

    The first pictures are made shortly after the exercise test and show blood flow to the heart during exercise. The heart is "stressed" during the exercise test -- thus the name "stress test." The patient then lies quietly for 2-3 hours and another series of pictures is made. These show blood flow to the heart muscle during rest.

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    What does the thallium stress test show?

    - If the test is normal during both exercise and rest, then blood flow through the coronary arteries is normal. The coronary arteries supply blood to the heart muscle.

    - If the test shows that perfusion (blood flow) is normal during rest but not during exercise (a perfusion defect), then the heart isn't getting enough blood when it must work harder than normal. This may be due to a blockage in one or more coronary arteries.

    - If the test is abnormal during both exercise and rest, there's limited blood flow to that part of the heart at all times.

    - If no thallium is seen in some part of the heart muscle, the cells in this part of the heart are dead from a prior heart attack. (They have become scar tissue.)

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    What if I can't perform an exercise test?

    Sometimes you can't do an exercise test because you're too sick or have physical problems. In this case, a drug such as dipyridamole (di-pi-RID'ah-mol) or adenosine is given. This drug increases blood flow to the heart and thus "mimics" an exercise test. Then the thallium test is given.

    Most people can raise their HDL (good cholesterol) levels by exercising, not smoking and staying at a healthy weight.

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