"porphyria." A Dictionary of Nursing. . Encyclopedia.com. (August 18, 2017). http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/porphyria
"porphyria." A Dictionary of Nursing. . Retrieved August 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/porphyria
Porphyria (por-FEER-ee-a) refers to a group of disorders that are genetic (hereditary). Common problems in porphyria include sensitivity to light, skin rashes, abdominal (ab-DOM-i-nal) pain, and discoloration of the urine.
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When a person inherits a defective gene* from one or both parents, he or she may develop a form of porphyria. There are six classifications of this group of disorders. Some of them are rare. While exact numbers are not available, it is estimated that one person in 10,000 to 50,000 may be affected.
- * genes
- are chemicals in the body that help determine a person’s characteristics, such as hair or eye color. They are inherited from a person’s parents and are contained in the chromosomes found in the cells of the body.
All six types of porphyria are a result of a problem in the chemical process by which the body makes heme, a compound that carries oxygen and makes blood red. Making heme requires eight different enzymes*. If any one of these enzymes fails, compounds that should be turned into heme instead build up in the body, especially in the liver* and in the bone marrow*, and cause problems. Some of these compounds are called porphyrins (POR-fi-rinz), which is where the disease gets its name. The different forms of porphyria occur from the failure of different enzymes.
- * enzymes
- (EN-zymz) are natural substances that speed up specific chemical reactions in the body.
- * liver
- is a large organ located in the upper abdomen (AB-do-men) that has many functions, including storage and filtration of blood, secretion of bile, and participation in various metabolic (met-a-BOLL-ik) processes.
- * marrow
- (MAR-o) is the soft tissue that fills the cavities of the bones.
Acute intermittent porphyria
This form of porphyria does not appear unless it is triggered by certain drugs, starvation or crash dieting, infection, and some hormones* in women. This form of porphyria is more common in women than in men. It usually occurs first during the young adult years. Symptoms include stomach pain, leg cramps, and muscle weakness. As its name indicates, it tends to occur from time to time (intermittently). In its most acute* forms, it can cause seizures*, paralysis*, depression*, and even hallucinations* or coma*. It is thought that King George III of England suffered from some form of porphyria.
- * hormones
- are chemicals that are produced by different glands in the body. Hormones are like the body’s ambassadors: they are created in one place but are sent through the body to have specific regulatory effects in different places.
- * acute
- means sudden.
- * seizures
- (SEE-zhurz) are sudden attacks of disease, often referring to some type of violent spasms.
- * paralysis
- (pa-RAL-i-sis) is the inability to move some part of the body.
- * depression
- (de-PRESH-un) is a mental state marked by sadness and despair.
- * hallucinations
- (ha-loo-si-NAY-shunz) are sensory perceptions not based in reality.
- * coma
- (KO-ma) is an unconscious state, like a very deep sleep. A person in a coma cannot be awakened, and cannot move, see, speak, or hear.
Porphyria cutanea tarda (ku-TAY-ne-a TAR-da)
This is the most common form of porphyria and causes blisters* on the parts of the body that are exposed to sunlight. Some people with this form also develop liver disease. Substances that can cause an attack of this type of porphyria include alcohol, heavy intake of iron (iron overload), or the use of birth control pills. Porphyria cutanea tarda usually does not affect younger women. However, the increased use of substances that can trigger an attack, such as alcohol or birth control pills, has resulted in more younger women developing the disease. This type of porphyria is not inherited. Only about 20 percent of cases have a family history of the disease.
Protoporphyria (pro-to-por-FEER-ee-a) usually starts in childhood. The skin is extremely sensitive to sunlight, and painful rashes, redness, and itching may develop.
Porphyria is diagnosed when an excess of porphyrins (compounds involved in making heme) is found in the urine. More laboratory tests help pinpoint specific forms of porphyria.
Heme is given to treat acute intermittent porphyria. For porphyria cutanea tarda, in which there is an excess of iron in the body, the patient may be bled. A pint of blood is removed once or twice a week for several weeks, until iron levels drop to normal. Drug treatment for some forms of porphyria is available. Avoiding light and other substances that can trigger an attack is important for people who are susceptible to any form of porphyria. Sunscreens are not helpful for preventing skin eruptions. Sometimes, betacarotene (bay-ta-KAR-o-teen) is given to help with light sensitivity. Doctors recommend prevention of attacks by avoiding substances that trigger symptoms.
American Porphyria Foundation (APF), P.O. Box 22712, Houston, TX 77227. Telephone 713-266-9617 http://www.enterprise.net/apf
"Porphyria." Complete Human Diseases and Conditions. . Encyclopedia.com. (August 18, 2017). http://www.encyclopedia.com/medicine/encyclopedias-almanacs-transcripts-and-maps/porphyria
"Porphyria." Complete Human Diseases and Conditions. . Retrieved August 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/medicine/encyclopedias-almanacs-transcripts-and-maps/porphyria
"porphyria." World Encyclopedia. . Encyclopedia.com. (August 18, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/porphyria
"porphyria." World Encyclopedia. . Retrieved August 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/porphyria
"porphyria." The Oxford Dictionary of Phrase and Fable. . Encyclopedia.com. (August 18, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/porphyria
"porphyria." The Oxford Dictionary of Phrase and Fable. . Retrieved August 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/porphyria