Plasmapheresis in the treatment of multi-drug intoxication involving levothyroxine sodium and calcium channel blockers: a case report.

Plasmapheresis, a procedure used to remove large molecular weight, protein-bound molecules from a patient's blood, has been shown to be useful in some cases of drug overdose. Levothyroxine sodium intoxication may result from the intentional or accidental ingestion of excessive amounts of the hormone, which can trigger a thyroid storm. However, case reports about the extremely large dose of 15,000 µg of thyroxine intoxication are extremely rare, and even combined with calcium channel blockers (CCBs) poisonings. We present a case of an intentional poisoning with high doses of thyroxine, diltiazem and amlodipine successfully treated with plasma exchange. A 40-year-old woman was admitted showing unconsciousness and sustained hypotension with high levels of thyroid hormones (THs). It was discovered that she had secretly ingested at least 15,000 µg of levothyroxine sodium and CCBs with unknown amounts of diltiazem and amlodipine. Following plasmapheresis, the levels of TH declined dramatically after each of the 4 sessions, with hemodynamics gradually stabilizing and mental state improving. The early and timely use of plasmapheresis appears to be a vital therapeutic tool for the management of acute and severe forms of l-thyroxine and CCB intoxication. Its use can prevent thyroid storm and reverse the disturbances in the patient's hemodynamic status.