Cardiovascular Events in Patients with Thyroid Storm
Abstract Context Thyroid storm can present as a multitude of symptoms, the most significant being cardiovascular. It is associated with various manifestations such as cardiac arrhythmia, heart failure, and ischemia. However, the frequencies of events and characteristics associated with patients that experience these events are not known. Objective To better understand the frequency and characteristics of cardiovascular occurrences associated with thyroid storm, through a retrospective analysis of thyroid storm hospital admissions. Design The study cohort was derived from the National Inpatient Sample database from January 2012 to September 2015. Setting Total hospitalizations of thyroid storm were identified using ICD-9 diagnostic codes. The analysis was performed using SAS. Results 6380 adult hospitalization were included in final analysis which includes 3895 hospitalization with cardiovascular events. Most frequently associated cardiovascular events was arrhythmia (N=3770) followed by acute heart failure (N=555) and ischemic events (N=150). Inpatient mortality was significantly higher in patient with cardiovascular events compared to those without cardiovascular events (3.5% vs 0.2%, p<0.005). Median length of stay was also higher in patients with cardiovascular events compared to those without cardiovascular events (4 days vs 3 days, p<0.0005). Atrial fibrillation was the most common arrhythmia type, followed by non-specified tachycardia. Conclusions In patients who were hospitalized due to thyroid storm and associated Cardiovascular events significantly increases in-hospital mortality, length of stay and cost. Patients with obesity, alcohol abuse, chronic liver disease, and COPD were more likely to have cardiovascular events. Patients with cardiovascular complications were at higher risk for mortality. In-hospital mortality increased with ischemic events and acute heart failure. Further evaluation is needed to further classify type of arrhythmias and associated mortality.