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Acute Intermittent Porphyria is a rare, inherited metabolic disorder that affects the nervous system. The condition is caused by a deficiency in an enzyme necessary for producing heme (a compound found in red blood cells), leading to a toxic buildup of substances called porphyrin precursors.
read more about acute intermittent porphyria ...The cause is an inherited genetic mutation. This mutation results in a deficiency of the enzyme porphobilinogen deaminase, which leads to the buildup of toxic porphyrin precursors in the liver and bloodstream.
Attacks are often triggered by specific medications (such as certain antibiotics or tranquilizers), hormonal changes, fasting, or illness, which place additional stress on the system. Identifying and strictly avoiding these triggers is the most effective preventative measure for patients with AIP and helps prevent neurological crisis.
Symptoms reflect an acute, severe neurological crisis. These include intense abdominal pain (often the most prominent symptom), vomiting, anxiety, confusion, seizures, and muscle weakness. The abdominal pain is frequently so severe that it is mistaken for a surgical emergency.
The excessive porphyrin precursors can also harm both the central and peripheral nervous systems, leading to paralysis and dangerous fluctuations in blood pressure and heart rhythm. The rapid progression of the attack requires immediate treatment to reduce the risk of lasting nerve damage.
Diagnosis involves urine and blood tests, particularly during an acute attack, to measure the high levels of porphyrin precursors. The urine may turn a dark red or purple color when exposed to light, which is a strong indicator. Genetic testing is ultimately used to confirm the inherited enzyme deficiency.
Acute Intermittent Porphyria can impact eye health indirectly during a severe neurological attack. Seizures or extreme neurological disruption can sometimes cause temporary visual loss or blurred vision. Chronic medication used to manage the disorder can also rarely have ocular side effects.
An acute attack is treated by administering high doses of intravenous glucose to slow the body's need for heme production, and by infusion of hemin (a heme derivative) to suppress the toxic buildup of precursors. Identifying and removing the causative trigger is necessary.
No, the condition is a chronic, inherited metabolic disorder, but acute attacks are treatable and preventable.
No, unlike some other forms of porphyria, Acute Intermittent Porphyria does not typically cause sun sensitivity or skin symptoms.
Yes, many common medications can trigger an acute attack and must be strictly avoided by patients with this condition.
Seek emergency care for severe abdominal pain accompanied by "dark or red urine." During an attack, patients may experience visual disturbances or hallucinations. Always provide your doctor with a list of "porphyrinogenic" drugs to avoid triggers.
American Porphyria Foundation. AIP (porphyriafoundation.org). 2024.
NORD. Acute Intermittent Porphyria (rarediseases.org). 2024.
Mayo Clinic. Porphyria (mayoclinic.org). 2024.
StatPearls. Acute Intermittent Porphyria (ncbi.nlm.nih.gov). 2024.