Final answer:
The patient who has only voided 100 ml in 8 hrs is the one who requires priority intervention due to significantly low urine output, indicative of possible acute renal failure, and necessitates immediate medical attention.
Step-by-step explanation:
The patient requiring priority intervention is the one who has only voided 100 ml in 8 hrs. This is considerably below the expected urine output, indicating a form of acute renal failure (ARF), which requires immediate attention. One of the criteria for ARF is a urine production of less than 0.5 ml/kg body weight for 6 hours. If left unattended, the condition might progress to the 'failure' stage, which involves a creatinine level three times the baseline, or urine output below 0.3 ml/kg for 24 hours.
While elevated levels of blood urea nitrogen (BUN) and creatinine can indicate diminished kidney function, a significant drop in urine output is a more immediate flag of kidney failure. A patient with a BUN of 22 or a creatinine of 1.6 mg/dl, or even somewhat higher, may be experiencing chronic kidney issues that need monitoring and possible intervention but might not be in the immediate danger that low urine output represents.
Patients with BUN and creatinine levels slightly above the normal range might be given more time for diagnosis and treatment planning, such as examining for causes like medication interference or urinary tract obstruction. However, the patient with drastically reduced urine output is at risk for rapid health deterioration and potentially life-threatening complications.