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 B

Explanation

Choice A rationale

ECG tests usually take 5 to 10 minutes to complete. The patient's chest pain necessitates a quick assessment, and prolonged testing could delay urgent care.

Choice B rationale

Electrodes applied to the chest and extremities detect the electrical activity of the heart, necessary for accurate ECG readings and diagnosing potential cardiac issues.

Choice C rationale

The ECG procedure does not typically cause tingling sensations. It involves passive measurement of electrical signals, making this statement inaccurate and potentially alarming to the patient.

Choice D rationale

ECG tests do not involve dye or radioactivity. This confusion may arise from nuclear stress tests, which are different procedures for evaluating heart function.

A. Flushed, warm legs. B. Thin, pliable toenails. C. Hairy legs. D. Leg pain at rest.

Correct Answer is D

Explanation

Choice A rationale

Flushed, warm legs are characteristic of chronic venous insufficiency, not peripheral artery disease, which results in poor arterial blood flow and cool extremities.

Choice B rationale

Thin, pliable toenails suggest nutritional deficiencies or fungal infections, not advanced peripheral artery disease, which often leads to thick, brittle nails.

Choice C rationale

Hairy legs are indicative of adequate blood flow. In peripheral artery disease, decreased blood flow results in hair loss on the legs.

Choice D rationale

Leg pain at rest, called rest pain, signifies advanced peripheral artery disease due to severe arterial insufficiency and poor oxygen supply to tissues. .

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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?