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Aminolevulinic acid dehydratase deficiency porphyria (also known as Doss porphyria, [1] plumboporphyria, [1] or ADP [2]) is an extremely rare autosomal recessive metabolic disorder that results from inappropriately low levels of the enzyme delta-aminolevulinic acid dehydratase , which is required for normal heme synthesis.
Porphyria / p ɔːr ˈ f ɪr i ə / is a group of disorders in which substances called porphyrins build up in the body, adversely affecting the skin or nervous system. [1] The types that affect the nervous system are also known as acute porphyria, as symptoms are rapid in onset and short in duration. [1]
Erythropoietic protoporphyria (or commonly called EPP) is a form of porphyria, which varies in severity and can be very painful.It arises from a deficiency in the enzyme ferrochelatase, leading to abnormally high levels of protoporphyrin in the red blood cells (erythrocytes), plasma, skin, and liver. [2]
The mean age at diagnosis is 33 years old. [5] Like other porphyrias, AIP is more likely to present in women. [6] A distinguishing feature of AIP that separates it from other porphyrias is the absence of photosensitive cutaneous symptoms that occur in addition to acute attacks. [7]
The patient should be thoroughly questioned regarding any symptoms of connective tissue disorder, which may be the underlying pathology of the photosensitivity. Recent reports suggest that a connective tissue disorder may be a predisposing factor in patients using nonsteroidal anti-inflammatory drugs (NSAIDs) who develop pseudoporphyria.
The diagnosis of any porphyria is often delayed due to the rarity of the disease as well as the varied and non-specific findings that patients present with. Bedside measurement of urine porphobilinogen is recommended as a screening test for patients suspected of having an acute porphyria. Elevated porphobilinogen is indicative of an acute ...
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