A client admitted with thyrotoxicosis is reporting a "pounding heart in the chest." Which assessment finding warrants immediate intervention by the nurse?

Rationale: A. Fever: Fever can accompany thyrotoxicosis and may indicate infection or thyroid storm. While it requires monitoring, it does not constitute the most urgent threat compared to respiratory compromise. B. Dyspnea: Shortness of breath or difficulty breathing in a client with thyrotoxicosis may indicate cardiac decompensation or a thyroid storm–related complication such as heart failure or pulmonary edema. This finding requires immediate intervention to prevent life-threatening consequences. C. Hyperglycemia: Elevated blood glucose may occur due to stress or underlying diabetes but is not an acute, life-threatening manifestation of thyrotoxicosis requiring immediate action. D. Anxiety: Anxiety is common with thyrotoxicosis but is generally not an emergent finding. It can be addressed with supportive measures but does not pose an immediate risk to the client’s physiological stability.