Massive thyroxine intoxication: evaluation of plasma extraction

• Published in: Intensive care medicine Vol. 13; no. 1; p. 33
• Main Authors: Binimelis, J, Bassas, L, Marruecos, L, Rodriguez, J, Domingo, M L, Madoz, P, Armengol, S, Mangues, M A, de Leiva, A
• Format: Journal Article
• Language: English
• Published: United States 1987
• Subjects: Aged; Coma - chemically induced; Female; Half-Life; Hemoperfusion; Humans; Male; Medication Errors; Middle Aged; Plasmapheresis; Thyrotoxicosis - chemically induced; Thyrotoxicosis - therapy; Thyroxine - blood; Thyroxine - poisoning; Triiodothyronine - blood
• ISSN: 0342-4642
• DOI: 10.1007/BF00263555

Six patients were admitted after erroneous massive intake of levothyroxine (70-1200 mg over an interval of 2-12 days). All patients developed classical symptoms of thyrotoxicosis within 3 days of the first dose; five patients presented grade II-III coma and one became stuporous (days 7-10). Two patients developed left ventricular failure and three had arrhythmias (days 8-11). Total thyroid hormone levels in serum on admission ranged 935-7728 nmol/l for T4 (TT4) and 23-399 nmol/l for T3 (TT3). All patients received treatment with hydrocortisone and Propranolol. Propylthiouracil was also given in 3 cases. Extractive techniques (charcoal haemoperfusion and/or plasmapheresis) were initiated 8-14 days after the first dose of L-T4. The plasma disappearance rate (K) of TT4 with plasmapheresis was 30 times higher, on average, than under standard medical treatment (M). Also, K of TT4 under haemoperfusion was about five times higher than K under M. K changes for TT3 were higher under haemoperfusion than under plasmapheresis. Furthermore, extractive procedures shortened the average half life of TT4, (from 106.5 +/- 44.6 to 59.7 +/- 20.2 h, p less than 0.05).