Which intervention should the nurse prioritize for a patient presenting with signs of severe dehydration?

A. Infusing isotonic intravenous fluids: Severe dehydration indicates a critical loss of intravascular volume that can lead to hypovolemic shock and organ failure. Isotonic fluids, such as 0.9% normal saline or lactated Ringer’s, expand the extracellular fluid volume without causing significant cellular shifts. This is the fastest method to restore perfusion in a patient. B. Administering oral rehydration salts: While oral rehydration is highly effective for mild to moderate dehydration, it is often insufficient for severe cases where the patient may have an altered level of consciousness or impaired gastric absorption. Intravenous access is necessary to bypass the digestive system. Rapid volume expansion is required to prevent circulatory collapse. C. Encouraging increased water intake: Oral water intake is a preventative or maintenance measure for healthy individuals or those with minimal fluid loss. In the context of severe dehydration, the patient's thirst mechanism and oral capacity cannot keep pace with the urgent need for volume. It is not an appropriate primary intervention for acute medical stabilization. D. Monitoring daily weights: Tracking weight is an essential nursing intervention for monitoring fluid trends over time, particularly in chronic conditions like renal or heart failure. However, in an acute dehydration crisis, it is a diagnostic or evaluative tool rather than a therapeutic one. The immediate priority is active fluid replacement.