A nurse is interpreting a client’s ECG strip.
Which of the following components of the ECG should the nurse examine to determine the time it takes for ventricular depolarization and repolarization?

PR interval.

QT interval.

QRS complex.

ST segment.

Answer and Explanation

The Correct Answer is B

Choice A rationale

The PR interval on an ECG represents the time from the onset of atrial depolarization to the onset of ventricular depolarization. It does not measure ventricular depolarization and repolarization.

Choice B rationale

The QT interval measures the total time taken for both ventricular depolarization and repolarization. Normal QT interval ranges are typically 350 to 440 milliseconds, depending on heart rate.

Choice C rationale

The QRS complex represents the duration of ventricular depolarization but does not include the repolarization phase. The normal duration of the QRS complex is usually 0.06 to 0.10 seconds.

Choice D rationale

The ST segment represents the time during which the ventricles are depolarized. It does not measure the time taken for ventricular depolarization and repolarization, but it can indicate ischemia or infarction. .

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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Homan's sign is an outdated diagnostic tool for DVT as it is not reliable or specific and can result in false positives or negatives, thus not recommended for diagnosis.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.

A. The QRS duration is 0.30 seconds. B. The T wave is in the inverted position. C. The P-R interval measures 0.32 seconds. D. The P wave falls before the QRS complex.

Correct Answer is D

Explanation

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. .

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A nurse is interpreting a client’s ECG strip.Which of the following components of the ECG should the nurse examine to determine the time it takes for ventricular depolarization and repolarization?

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A nurse is interpreting a client’s ECG strip.
Which of the following components of the ECG should the nurse examine to determine the time it takes for ventricular depolarization and repolarization?