A client with untreated hyperthyroidism presents with a sudden onset of symptoms. Which finding should the nurse recognize as indicative of thyroid storm?

Thyroid storm is an acute, life-threatening neuroendocrine crisis precipitated by an extreme surge of triiodothyronine and thyroxine into systemic circulation. This hormonal overload induces massive overstimulation of cellular beta-adrenergic receptors, dramatically accelerating global metabolic rates. The clinical presentation features extreme hyperthermia, profound tachycardia, agitation, delirium, and high-output cardiovascular collapse. A. Fever and tachycardia: Extreme hyperpyrexia up to 41 degrees Celsius and heart rates exceeding 140 beats per minute indicate massive metabolic and sympathetic overstimulation. These findings represent the key diagnostic hallmarks of a thyrotoxic crisis. They signal immediate, life-threatening cardiovascular and thermoregulatory decompensation. B. Bradycardia: Low heart rates reflect parasympathetic dominance or sinoatrial node depression, directly contradicting the hyper-adrenergic state of thyrotoxicosis. Thyroid hormones upregulate cardiac chronotropic responses, making a slow heart rate clinically impossible in this storm. Bradycardia points toward profound hypothyroidism instead. C. Hypotension: While late-stage shock leads to vascular collapse, the initial hyperkinetic phase of this crisis drives a wide pulse pressure and hyperdynamic systolic readings. Isolated hypotension without tachycardia is inconsistent with early thyroid crisis mechanics. Cardiovascular overstimulation characteristically spikes hemodynamic parameters initially. D. Cold intolerance: Sluggish metabolic output and cutaneous vasoconstriction cause cold sensitivity, which is a classic symptom seen in hypothyroid patients. Thyrotoxic crises generate massive excess internal heat, causing intense heat intolerance and profuse diaphoresis. Patients actively attempt to cool their elevated core temperatures.