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.
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Related Questions
Correct Answer is A
Explanation
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.
Correct Answer is B
Explanation
A. Pelvic fracture: Pelvic fractures may cause significant pain and instability but do not typically result in a shortened, adducted, and externally rotated leg.
B. Femoral neck fracture: These findings (shortened, adducted, externally rotated leg) are classic for a femoral neck fracture due to muscle contraction and displacement of the bone.
C. Tibia fracture: Tibia fractures typically present with swelling and deformity, not shortening or rotation of the leg.
D. Fibula fracture: A fibula fracture alone rarely causes leg shortening or rotation as it is a non-weight-bearing bone.
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