Final answer:
The priority nursing intervention for a patient with rapid glomerular inflammation and declining urine output is to monitor the patient's cardiac status to manage fluid balance and prevent complications.
Step-by-step explanation:
The priority nursing intervention for a patient with rapidly progressing glomerular inflammation, evidenced by weight gain and declining urine output, is to Monitor the patient's cardiac status. This is crucial due to the risk of fluid overload, which can lead to acute congestive heart failure. Close monitoring allows for timely interventions, such as administering diuretics, to manage fluid balance and prevent complications associated with fluid retention. Additionally, monitoring vital signs, including blood pressure and heart rate, is essential in guiding treatment decisions and assessing the patient's response to therapy.