The health care provider orders a continuous intravenous aminophylline infusion for a two year old client. It is most important for the nurse to intervene for which situation?
1) The client develops a rash
2) The client's heart rate increases to 180 beats per minute
3) The client's blood pressure decreases to 80/50 mmHg
4) The client's respiratory rate decreases to 8 breaths per minute