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 correct answer is choice B. How to operate the portable suction machine. The nurse should include this information in the teaching because suctioning is often needed to keep the tracheostomy tube and opening free from extra mucus and secretions that come from the lungs and tissue around the stoma. Suctioning can help prevent the tube from becoming plugged and improve breathing.
Choice A is wrong because the nondisposable tracheostomy tube does not need to be changed daily. It can be changed every 1 to 3 months, depending on the type of tube.
Choice C is wrong because the tracheostomy dressing should be changed using sterile technique, not clean technique, to prevent infection.
Choice D is wrong because the tracheostomy tube should not be secured with ties at the back of the neck. The ties should be fastened at the front or side of the neck, and they should be snug but not too tight.
Correct Answer is D
Explanation
The correct answer is choice D. This test should be performed after your baby is 24 hours old. This is because newborn genetic screening is a set of laboratory tests that detect a set of known genetic diseases that can affect a child’s long-term health or survival. The test is performed on a blood sample obtained from a heel prick when the baby is two or three days old. Performing the test after 24 hours ensures that the baby has had enough time to metabolize certain substances that could interfere with the accuracy of the test.
Choice A is wrong because the blood sample is not drawn from the baby’s inner elbow, but from the heel. Choice B is wrong because the baby does not need to drink water prior to the test, as this could dilute the blood sample and affect the results. Choice C is wrong because the test does not need to be repeated when the baby is 2 months old, unless there is a positive or inconclusive result from the first test.
Newborn genetic screening is important for early detection and intervention of certain conditions that can cause serious health problems or disability if left untreated. Parents should be informed about the benefits and limitations of the test, as well as their rights and options regarding consent and confidentiality.
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