Rectal thionamide administration in the setting of thyroid storm: a case report and review of the literature.

Summary: Thyroid storm is a clinical diagnosis characterized by life-threatening multisystemic organ involvement in the setting of uncontrolled hyperthyroidism. Current estimates suggest a mortality rate of up to 30%. Treatment often consists of the administration of thionamide medications, iodine solution(s), corticosteroids, and beta-blockers; in extreme circumstances, both plasmapheresis and thyroidectomy are subsequent therapeutic options. Thionamides are typically administered orally, with the intent of preventing further thyroid hormone synthesis; however, in the literature, there are instances whereby oral access cannot be obtained, and alternative routes of administration are required. We present a case of a patient who presented with a thyroid storm due to lack of adherence to methimazole. During admission, he was found to have significant abdominal pain and ultimately a duodenal perforation requiring strict nil-per-os (NPO) status, due to which he was unable to receive oral thionamides. Due to the lack of availability of intravenous formulations of thionamides in the United States, this patient was treated with an enema compound of propylthiouracil for a total of five per rectum (PR) doses. He would later develop hepatocellular injury, requiring discontinuation and eventual transition to oral methimazole. The literature pertaining to alternative-route thionamide administration is scant, and therefore this case report and literature review is written to provide an up-to-date review and further educate all levels of clinicians about this infrequent (but emergent) situation.

Learning points: Thyroid storm is a clinical diagnosis for which urgent recognition is required to prevent untoward mortality. Treatment for thyroid storm requires prompt administration of thionamides, iodine, corticosteroids, and beta-blockers. In extreme circumstances, treatment considerations include plasmapheresis and thyroidectomy. Infrequently, patients with a thyroid storm may not be able to tolerate oral medications, for which alternative routes of access are required. Currently, available alternatives include intravenous methimazole (in Europe and Japan), as well as both enema and suppository preparations of propylthiouracil and methimazole.