Final answer:
In Addison's crisis, urgent symptoms requiring immediate nursing intervention include postural hypotension, pallor and diaphoresis, and an irregular heartbeat, all of which indicate potential cardiovascular instability and risk of shock.
Step-by-step explanation:
In the context of Addison's crisis, which is a severe and acute presentation of adrenal insufficiency, the findings that require immediate action by the nurse are: postural hypotension, pallor and diaphoresis, and irregular heartbeat. These symptoms indicate significant instability and risk of shock, which can be life-threatening.
Postural hypotension, a drop in blood pressure upon standing, can lead to falls and injury, as well as signal potential cardiovascular collapse. Pallor and diaphoresis are indicative of inadequate circulation and possibly severe dehydration. An irregular heartbeat can suggest electrolyte imbalances, specifically hyperkalemia, which is a common complication of Addison's disease and can be fatal if not treated promptly.