The nurse who is working in the telemetry unit measures the PR interval of the client's rhythm strip depicted below. What is the nurse's analysis of the PR interval?
Atria is taking longer to depolarize and contract
Conduction time is slowed from the SA node to the ventricles
The PR interval is within the normal time limits
Ventricular repolarization is delayed
The Correct Answer is C
A. Atria is taking longer to depolarize and contract: This would be indicated by a prolonged or abnormal P wave, not a normal PR interval. The rhythm strip shows clearly visible, normal-appearing P waves followed by QRS complexes, ruling this out as the correct interpretation.
B. Conduction time is slowed from the SA node to the ventricles: A slowed conduction time would result in a PR interval longer than 0.20 seconds, characteristic of first-degree AV block. The PR interval on this strip measures within the standard range (0.12–0.20 seconds), so this is not accurate.
C. The PR interval is within the normal time limits: The PR interval on the ECG strip spans about 3 to 4 small boxes (0.12–0.16 seconds), which is within the normal range of 0.12 to 0.20 seconds. This indicates normal conduction from the atria through the AV node to the ventricles.
D. Ventricular repolarization is delayed: Delayed ventricular repolarization refers to a prolonged QT interval, not an abnormality in the PR interval. The PR interval evaluates atrial conduction, not ventricular repolarization, so this is an incorrect association.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Increase the pacemaker sensitivity: Adjusting pacemaker sensitivity is a technical function typically managed by a cardiologist or device technician. There is no indication from the information provided that the pacemaker is under- or over-sensing, so no adjustment is warranted.
B. Document that the pacemaker is regular: While the pacemaker may be functioning regularly, this statement is vague and does not accurately describe the observed pacing activity. The key observation is the spike occurring before the P wave, which requires more specific documentation.
C. Set the pacemaker to the asynchronous mode: Asynchronous pacing means the pacemaker fires at a set rate regardless of the patient's intrinsic rhythm and is generally reserved for specific situations such as during surgery or when interference with sensing is suspected. There is no evidence of pacemaker malfunction or need to override sensing in this scenario.
D. Document that the atria are being paced: A pacemaker spike immediately before the P wave indicates atrial pacing. This means the pacemaker is stimulating the atria, leading to atrial depolarization. This is the appropriate interpretation and should be documented clearly.
Correct Answer is C
Explanation
A. gabapentin & acetaminophen: While acetaminophen may help with pain relief, gabapentin is primarily used for neuropathic pain and not effective for the inflammatory chest pain associated with pericarditis. These medications do not address the positional nature of pericardial pain.
B. extended release opioids: Opioids may provide general pain relief but are not the standard treatment for pericarditis-related pain. They do not address the inflammatory cause and carry risks of sedation and respiratory depression without improving cardiac inflammation.
C. sitting & leaning forward: Pericarditis pain is classically relieved by having the patient sit up and lean forward. This position reduces pressure on the pericardium and decreases pain by allowing the inflamed pericardial layers to separate slightly, reducing friction.
D. supine with head of bed 15 degrees: Lying flat or even slightly elevated can worsen pericarditis pain because it increases pressure on the inflamed pericardium. Patients often report increased discomfort in the supine position, making it less favorable for symptom relief.
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