A nurse is monitoring a client who is on telemetry.
Which of the following findings on the ECG strip should the nurse recognize as normal sinus rhythm?
The QRS duration is 0.30 seconds.
The T wave is in the inverted position.
The P-R interval measures 0.32 seconds.
The P wave falls before the QRS complex.
The Correct Answer is D
Choice A rationale
A QRS duration of 0.30 seconds is abnormally long. The normal QRS duration is 0.06 to 0.12 seconds, indicating this is not normal sinus rhythm.
Choice B rationale
An inverted T wave is not a characteristic of normal sinus rhythm. It may indicate ischemia or other cardiac abnormalities.
Choice C rationale
A P-R interval of 0.32 seconds is prolonged. The normal P-R interval is 0.12 to 0.20 seconds, thus indicating an abnormal rhythm.
Choice D rationale
The P wave falling before the QRS complex is a key characteristic of normal sinus rhythm, representing the orderly conduction of electrical impulses from atria to ventricles. .
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale
Cold therapy is used for acute injuries to reduce swelling and pain but is not recommended for deep vein thrombosis (DVT) as it can cause vasoconstriction and worsen the condition.
Choice B rationale
Homan's sign is an outdated diagnostic tool for DVT as it is not reliable or specific and can result in false positives or negatives, thus not recommended for diagnosis.
Choice C rationale
Venous duplex ultrasound is the gold standard for diagnosing DVT as it visualizes blood flow and identifies thrombi within the veins, providing accurate and non-invasive detection.
Choice D rationale
Impedance plethysmography measures changes in blood volume but is less accurate than venous duplex ultrasound, and its use has declined in favor of more reliable imaging techniques.
Correct Answer is B
Explanation
Choice A rationale
Calcium 10 mg/dL is within the normal range (8.5-10.5 mg/dL) and does not require reporting. This value does not indicate any electrolyte imbalance that would necessitate immediate intervention.
Choice B rationale
Potassium 2.3 mEq/L is significantly below the normal range (3.5-5.0 mEq/L), indicating hypokalemia. This condition requires prompt reporting as it can lead to arrhythmias, muscle weakness, and other complications.
Choice C rationale
Chloride 99 mEq/L is within the normal range (98-106 mEq/L) and does not require reporting. This value indicates no chloride imbalance affecting the client's condition.
Choice D rationale
Sodium 136 mEq/L is within the normal range (135-145 mEq/L) and does not require reporting. This sodium level is not indicative of any electrolyte disturbance needing immediate medical attention. .
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