Which sign is indicative of a thyroid storm?

A thyroid storm, also known as thyrotoxic crisis, is a severe and life-threatening form of hyperthyroidism characterized by an extreme increase in metabolic rate. One of the hallmark signs of this condition is tachydysrhythmias, which refers to rapid and irregular heart rhythms.

In thyroid storm, the excessive thyroid hormone leads to overstimulation of the cardiovascular system, resulting in rapid heart rate (tachycardia) and potentially life-threatening dysrhythmias. This is crucial for recognizing and diagnosing a thyroid storm, as it can lead to complications like heart failure or other cardiovascular issues if not treated promptly.

The other symptoms listed, such as vaginal itching, breast tenderness, and fatigue, are not typical indicators of a thyroid storm and reflect other conditions that do not directly correlate with the extreme physiological changes occurring during such an acute episode. Thus, tachydysrhythmias stand out as a significant and urgent clinical sign in the context of thyroid storm.