A nurse is reviewing a client’s cardiac rhythm strips and notes a constant P-R interval of 0.35 seconds.
Which of the following dysrhythmias is the client displaying
Atrial fibrillation.
Complete heart block
First-degree atrioventricular block
Premature atrial complexes
The Correct Answer is C
- . Answer and explanation.
The correct answer is choice C, first-degree atrioventricular block.
This is because the PR interval is longer than normal, which indicates a delay in the conduction of electrical impulses from the atria to the ventricles through the AV node. A normal PR interval is 0.12 to 0.2 seconds, or 3 to 5 small squares on the EKG strip.
In this case, the PR interval is 0.35 seconds, which is more than 5 small squares.
Choice A is wrong because atrial fibrillation is a type of arrhythmia where the atria beat irregularly and rapidly, producing chaotic and variable P waves and an irregular ventricular response.
There is no constant PR interval in atrial fibrillation.
Choice B is wrong because complete heart block is a type of arrhythmia where there is no conduction of electrical impulses from the atria to the ventricles, resulting in independent and dissociated atrial and ventricular rhythms.
There are no consistent P waves or PR intervals in complete heart block.
Choice D is wrong because premature atrial complexes are extra beats that originate from the atria and interrupt the normal sinus rhythm.
They produce abnormal P waves that are different from the sinus P waves, and may have a shorter or longer PR interval depending on the timing of the impulse.
However, they do not cause a constant prolongation of the PR interval.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
The systolic pressure is estimated by noting the pressure at which the pulse disappears and reappears. The diastolic pressure is not measured by this method, but it can be useful when the sounds are difficult to hear.
Choice A is wrong because applying the largest cuff available can result in a falsely low reading. The cuff size should be appropriate for the client’s arm circumference.
Choice C is wrong because placing the arm above the level of the client’s heart can also cause a falsely low reading. The arm should be at the level of the heart for an accurate measurement.
Choice D is wrong because deflating the cuff quickly can lead to missing or skipping sounds, resulting in an inaccurate reading. The cuff should be deflated slowly and evenly.
Normal ranges for blood pressure vary depending on age, sex, and health conditions, but generally, a systolic pressure below 120 mmHg and a diastolic pressure below 80 mmHg are considered normal for adults.
Correct Answer is A
Explanation
The correct answer is choice A. The nurse should compare new prescriptions with the list of medications the client reports. This is part of the medication reconciliation process, which is done to avoid medication errors such as omissions, duplications, dosing errors, or drug interactions. It should be done at every transition of care in which new medications are ordered or existing orders are rewritten.
Choice B is wrong because the nurse should not encourage the client to make his own list after he returns to his home. The nurse should provide the client with an updated and accurate list of medications before discharge and instruct the client to keep it with him at all times.
Choice C is wrong because the nurse should not include any adverse effects of the medications the client might develop. The nurse should include any known allergies or adverse reactions the client has experienced in the past, but not potential adverse effects that have not occurred.
Choice D is wrong because the nurse should not exclude nutritional supplements from the list of medications the client reports. The nurse should include all prescription medications, herbals, vitamins, nutritional supplements, over-the-counter drugs, vaccines, diagnostic and contrast agents, radioactive medications, parenteral nutrition, blood derivatives, and intravenous solutions in the medication reconciliation process.
Some of these products may interact with prescribed medications or affect laboratory results.
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