A patient receiving aminophylline (Theophylline) by continuous IV infusion for a severe asthma attack asks why a blood sample must be drawn. What is the nurse's best response?
a. "The blood level of this drug that causes dangerous side effects is close to the level needed to help open the airways."
b. "The blood test helps us evaluate how well the drug is working to open your air-ways and improve your oxygen intake."
c. "The blood test helps determine how much of this drug you are making naturally and how much we are giving you."
d. This blood tests assesses whether you are developing an allergy to this drug."
A
The therapeutic range for theophylline is very narrow (10 to 20 mcg/mL). If the drug blood levels are lower than 10 mcg/mL, the patient's symptoms will not be controlled. If the drug blood levels are higher than 20 mcg/mL, the patient may have serious adverse reactions. Blood levels of this drug need to be monitored closely to ensure safe and effective drug delivery.
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