Takashi Akamizu

Context The mortality rate in thyroid storm (TS) has been reported to be higher than 10%. Objective We aimed to evaluate the effectiveness of the 2016 guidelines for the management of TS proposed by the Japan Thyroid Association and Japan Endocrine Society. Methods In this prospective multicenter registry–based study, patients with new-onset TS were registered in the Research Electronic Data Capture (REDCap), a secure web platform. On day 30 after admission, clinical information and prognosis of each patient were added to the platform. On day 180, the prognosis was described. Results This study included 110 patients with TS. The median of Acute Physiology and Chronic Health Evaluation (APACHE) II score was 13, higher than the score (10) in the previous nationwide epidemiological study (P = .001). Nonetheless, the mortality rate at day 30 was 5.5%, approximately half compared with 10.7% in the previous nationwide survey. Lower body mass index, shock, and lower left ventricular ejection fraction were positively associated with poor prognosis at day 30, while the lack of fever ≥ 38 °C was related to the outcome. The mortality rate in patients with an APACHE II score ≥ 12 for whom the guidelines were not followed was significantly higher than the rate in patients for whom the guidelines were followed (50% vs 4.7%) (P = .01). Conclusion Prognosis seemed better than in the previous nationwide survey, even though disease severity was higher. The mortality rate was lower when the guidelines were followed. Thus, the guidelines are useful for managing TS.