A nurse evaluates an asthmatic patient who has developed tachycardia and dysrhythmias. The laboratory result that would suggest that these signs are the result of theophylline toxicity is a serum theophylline level _______ mcg/mL
a. below 10
b. above 30
c. between 20 and 25
d. above 2.5
ANS: B
The laboratory result that would confirm severe toxicity, which would lead to tachycardia and dysrhythmias, is a serum theophylline level above 30 mcg/mL.
A serum theophylline level of 5 to 15 mcg/mL is appropriate for most patients. This level falls within that range and does not demonstrate toxicity.
At serum theophylline level of 20 to 25 mcg/mL, the patient may experience relatively mild reactions, such as nausea, vomiting, diarrhea, insomnia, and restlessness.
A serum theophylline level below 2.5 is most probably subtherapeutic, not toxic.
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