A nurse on a telemetry unit is assessing a client who is receiving continuous cardiac monitoring. The client's heart rate is 69/min and the PR interval is 0.24 seconds. The nurse should interpret this finding as which of the following cardiac rhythms?
Atrial fibrillation
First-degree AV block
Premature ventricular contraction
Sinus bradycardia
The Correct Answer is B
The correct answer is B.
Choice A reason: Atrial fibrillation is characterized by a rapid, irregular heartbeat and an absence of distinct P waves on the ECG, which is not indicated by the information provided.
Choice B reason: First-degree AV block is indicated by a prolonged PR interval without affecting the overall heart rate, aligning with the client’s PR interval of 0.24 seconds.
Choice C reason: Premature ventricular contraction would show an abnormal QRS complex on the ECG, which is not mentioned in the scenario.
Choice D reason: Sinus bradycardia is defined by a heart rate less than 60 bpm, which does not apply here as the client’s heart rate is 69/min, within the normal range of 60-100 bpm.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Banana slices are soft, easy to chew, and can be picked up by the toddler’s fingers, which promotes independence in eating. According to the CDC, foods that toddlers should avoid include:
- Added sugars and no-calorie sweeteners, such as sugar-sweetened and diet drinks
- High-salt foods, such as canned foods, processed meats, frozen dinners, fast food, and junk food
- Unpasteurized juice, milk, yogurt, or cheese
- Foods that may cause choking, such as hard or crunchy foods, sticky foods, stringy cheese, and foods that are not cut up into small pieces
Choice A is wrong because popcorn is a choking hazard for toddlers.
It is hard, crunchy, and can get stuck in the airway. The NHS advises not to give whole nuts and peanuts to children under 5 years old.
Choice B is wrong because grapes are also a choking hazard for toddlers.
They are round, slippery, and can block the airway. The NHS recommends cutting grapes into quarters before giving them to young children.
Choice D is wrong because hot dogs are high in salt and can cause choking if not cut up into small pieces. The Extension warns against giving hot dogs to young toddlers.
Correct Answer is D
Explanation
This prescription is complete because it includes the medication name, dose, route, and frequency.
A complete prescription should also include the client’s name, date, time, signature of the prescriber, and any special instructions.
Choice A is wrong because it does not specify the dose of cimetidine.
PO twice daily is not enough information to administer the medication safely.
Choice B is wrong because it does not specify the frequency of tetracycline.
200 mg PO is not enough information to administer the medication safely.
Choice C is wrong because it does not specify the route of epoetin alfa.
150 units/kg three times weekly is not enough information to administer the medication safely.
Normal ranges for digoxin are 0.5 to 2 ng/mL for heart failure and 0.8 to 2 ng/mL for atrial fibrillation.
Normal ranges for cimetidine are 50 to 150 ng/mL.
Normal ranges for tetracycline are 1 to 10 mcg/mL.
Normal ranges for epoetin alfa are not applicable as it is a synthetic hormone that stimulates red blood cell production.
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