The nurse is caring for a client who is on cardiac telemetry monitoring and notes that the PR interval is 0.16 seconds. Which interpretation is correct for the nurse to make?
It indicates a normal depolarization of the atria.
It provides information about atrial repolarization.
It shows an early indication of first degree heart block.
It reflects a delayed conduction through the atria.
The Correct Answer is A
A. It indicates a normal depolarization of the atria: A PR interval of 0.12–0.20 seconds is within the normal range, representing normal conduction through the atria and AV node.
B. It provides information about atrial repolarization: Atrial repolarization is obscured by the QRS complex and not reflected in the PR interval.
C. It shows an early indication of first-degree heart block: First-degree heart block is indicated by a PR interval longer than 0.20 seconds.
D. It reflects a delayed conduction through the atria: A delay in conduction would result in a prolonged PR interval.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Troponin: Troponin is the most specific and reliable biomarker for myocardial injury. Levels rise within 3-6 hours and remain elevated for days, providing diagnostic and prognostic information.
B. Alkaline phosphatase: This is related to liver and bone disorders, not cardiac events.
C. Creatine kinase (CK): While CK-MB is specific to cardiac tissue, it is less specific and remains elevated for a shorter period compared to troponin.
D. Myoglobin: Myoglobin is an early but nonspecific marker of muscle damage and is not as reliable for diagnosing myocardial injury.
Correct Answer is D
Explanation
A. Restlessness: This may occur in the pre-active phase of dying but is not specific to the actively dying phase.
B. Decreased appetite: A reduced appetite is common earlier in the dying process, not specific to the actively dying phase.
C. Skin pallor: Skin changes, such as pallor, occur earlier; mottling is more indicative of the actively dying phase.
D. Anuria: Anuria (absence of urine output) is a hallmark sign of multisystem failure and the actively dying phase.
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