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Toxicology – Toxins Causing Cyanosis
Ergotamine
Ergot compounds can lead to acrocyanosis due to intense vasoconstriction, resembling a secondary Raynaud phenomenon affecting peripheral circulation.
Phenazopyridine
This urinary tract analgesic can induce methemoglobinemia, impairing oxygen delivery and resulting in cyanosis.
Aniline
Aniline, a chemical used in the production of dyes and polyurethane, can cause both methemoglobinemia and hemolytic anemia, contributing to cyanotic discoloration.
Dapsone
Dapsone, used in the treatment of leprosy and for Pneumocystis jirovecii pneumonia prophylaxis, is a well-known cause of methemoglobinemia.
Nitrates
Nitrates, sometimes present in contaminated well water, can induce methemoglobinemia, particularly in infants.
Nitrites
Nitrites are used therapeutically to induce methemoglobinemia in cyanide poisoning but may also be abused recreationally for their vasodilatory effects, leading to cyanosis.
Asphyxia
Conditions causing hypoxemia or impaired oxygen delivery increase levels of deoxygenated hemoglobin, resulting in cyanosis.
Treatment
Methylene blue is the treatment of choice for methemoglobinemia. It acts as a reducing agent, converting methemoglobin back to functional hemoglobin, and is typically administered at a dose of 1–2 mg/kg intravenously over 5 minutes.
Ergotamine
Ergot compounds can lead to acrocyanosis due to intense vasoconstriction, resembling a secondary Raynaud phenomenon affecting peripheral circulation.
Phenazopyridine
This urinary tract analgesic can induce methemoglobinemia, impairing oxygen delivery and resulting in cyanosis.
Aniline
Aniline, a chemical used in the production of dyes and polyurethane, can cause both methemoglobinemia and hemolytic anemia, contributing to cyanotic discoloration.
Dapsone
Dapsone, used in the treatment of leprosy and for Pneumocystis jirovecii pneumonia prophylaxis, is a well-known cause of methemoglobinemia.
Nitrates
Nitrates, sometimes present in contaminated well water, can induce methemoglobinemia, particularly in infants.
Nitrites
Nitrites are used therapeutically to induce methemoglobinemia in cyanide poisoning but may also be abused recreationally for their vasodilatory effects, leading to cyanosis.
Asphyxia
Conditions causing hypoxemia or impaired oxygen delivery increase levels of deoxygenated hemoglobin, resulting in cyanosis.
Treatment
Methylene blue is the treatment of choice for methemoglobinemia. It acts as a reducing agent, converting methemoglobin back to functional hemoglobin, and is typically administered at a dose of 1–2 mg/kg intravenously over 5 minutes.
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