A diabetic client who is currently taking metformin is ordered a computerized tomography (CT) scan with contrast. The nurse understands that the client's metformin should be discontinued how many hours before receiving intravenous (IV) contrast?
24 hours
12 hours
6 hours
48 hours
The Correct Answer is B
A. Discontinuing metformin 24 hours before a CT scan is longer than necessary and not standard practice.
B. It is generally recommended that metformin be held for at least 12 hours before the administration of IV contrast to reduce the risk of lactic acidosis, especially in clients with renal impairment.
C. Six hours is insufficient time to ensure the medication is cleared from the system, considering the potential risks.
D. Discontinuing metformin for 48 hours is overly cautious and not necessary unless there are complications that arise after the contrast is administered.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["B","C","F"]
Explanation
B. Aged cheeses like cheddar contain high levels of tyramine, which can trigger hypertensive crises in clients taking MAOIs.
C. Smoked and cured meats, such as sausage, are high in tyramine and should be avoided.
F. Red wine is another common source of tyramine, and consumption should be avoided while taking MAOIs.
A. Fruit juices are generally low in tyramine and do not need to be excluded.
D. Cereal is not typically high in tyramine, so it is safe to consume.
E. Grilled chicken, as a fresh protein source, is low in tyramine and safe for clients on MAOIs.
Correct Answer is C
Explanation
A. Benztropine (Cogentin) is an anticholinergic used primarily for Parkinson's disease and does not have an effect on seizure activity.
B. Phenytoin (Dilantin) is an antiepileptic medication, but it is not typically used as a rescue medication for immediate cessation of seizures in status epilepticus; it is used for long-term management.
C. Diazepam (Valium) is a benzodiazepine that acts quickly to stop seizures and is commonly used in acute situations, including status epilepticus, due to its rapid onset of action.
D. Ethosuximide (Zarontin) is primarily used for absence seizures and is not indicated for status epilepticus.
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