which of the following is considered a class ia sodium channel blocker

ATI RN

ATI Pharmacology Proctored

1. Which of the following is considered a class IA Sodium Channel blocker?

A. Mexiletine
B. Amiodarone
C. Quinidine
D. Procainamide

Correct answer: D

Rationale: Procainamide is a class IA antiarrhythmic drug that acts as a sodium channel blocker by blocking fast sodium channels. Mexiletine is a class IB antiarrhythmic drug, not class IA. Amiodarone is a class III antiarrhythmic, and Quinidine is a class IA antiarrhythmic but not a sodium channel blocker.

2. A client has a new prescription for Metformin. Which of the following adverse effects of Metformin should the nurse instruct the client to report to the provider?

A. Somnolence
B. Constipation
C. Fluid retention
D. Weight gain

Correct answer: A

Rationale: The correct answer is 'A: Somnolence.' Somnolence can indicate lactic acidosis, which is manifested by extreme drowsiness, hyperventilation, and muscle pain. It is a rare but very serious adverse effect caused by metformin and should be reported to the provider promptly to prevent further complications.

3. A healthcare professional is reviewing the medication administration record for a client who is receiving transdermal Fentanyl for severe pain. Which of the following medications should the healthcare professional expect to cause an adverse effect when administered concurrently with Fentanyl?

A. Ampicillin
B. Diazepam
C. Furosemide
D. Prednisone

Correct answer: B

Rationale: Diazepam, a CNS depressant, can lead to severe sedation when administered concurrently with an opioid like Fentanyl due to their additive central nervous system depressant effects. This interaction can potentiate respiratory depression and other CNS effects, increasing the risk of adverse outcomes.

4. A client has a prescription for Timolol eye drops for the treatment of glaucoma. Which of the following instructions should the nurse include?

A. Apply gentle pressure to the nasolacrimal duct for 30 to 60 seconds after application.
B. Avoid blinking immediately after instilling the drops.
C. Keep your eyes closed for 5 minutes after application.
D. Administer the drops directly onto the cornea.

Correct answer: A

Rationale: The correct instruction for the nurse to include is to apply gentle pressure to the nasolacrimal duct for 30 to 60 seconds after application. This technique helps prevent systemic absorption of the medication, reducing the risk of systemic side effects. By applying pressure, the drainage of the medication into the bloodstream through the nasolacrimal duct is minimized, enhancing the drug's local ocular effects. Choices B, C, and D are incorrect because blinking immediately after instilling the drops, keeping eyes closed for 5 minutes, and administering the drops directly onto the cornea are not recommended practices for administering Timolol eye drops.

5. What is the classification of Ondansetron?

A. Antihypertensive
B. Antiarrhythmic
C. Antiemetic
D. Antiulcer agent

Correct answer: C

Rationale: Ondansetron is classified as an antiemetic. It is commonly used to prevent nausea and vomiting, especially in patients undergoing chemotherapy or surgery. Choice A, Antihypertensive, is incorrect as Ondansetron is not used to treat high blood pressure. Choice B, Antiarrhythmic, is incorrect as Ondansetron is not used to manage heart rhythm abnormalities. Choice D, Antiulcer agent, is incorrect as Ondansetron is not primarily indicated for treating ulcers.