The nurse is caring for an adolescent client who is in the intensive care unit after a suicide attempt with barbiturate drugs and alcohol. the client is hypotensive with a mean arterial pressure (map) below 30 and a urine output that has decreased from 30 ml/hr to 2 ml/hr. serum creatinine and potassium are both elevated. the parents of the client notice the small amount of urine in the indwelling catheter drainage bag and ask why there is so little. what is the best response by the nurse