A student nurse is reviewing for an upcoming examination and recognizes in the ECG readings that the QRS wave represents which of the following?

Atrial depolarization.

Ventricular repolarization.

Atrial repolarization.

Ventricular depolarization.

Answer and Explanation

The Correct Answer is D

Choice A rationale

Atrial depolarization is represented by the P wave on an ECG, not the QRS wave. This phase involves the electrical activation and contraction of the atria, which precedes ventricular contraction.

Choice B rationale

Ventricular repolarization is represented by the T wave, not the QRS complex. The T wave signifies the ventricles returning to their resting state.

Choice C rationale

Atrial repolarization generally occurs during the QRS complex, but it is not represented by it. The electrical activity of atrial repolarization is masked by the more significant ventricular depolarization signal of the QRS complex.

Choice D rationale

The QRS complex on an ECG represents ventricular depolarization, which is the electrical activation leading to the contraction of the ventricles. This is the correct answer as it accurately describes the QRS wave’s significance. .

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Correct Answer is B

Explanation

Choice A rationale

Lateralization to the unaffected ear in Weber's test actually indicates sensorineural hearing loss in the affected ear. This choice is incorrect as it doesn’t describe the correct procedure for the test.

Choice B rationale

The Weber's test involves placing an activated tuning fork in the midline of the skull and asking the patient if the sound is heard more loudly in either ear. This helps determine if there is lateralization, which is key in diagnosing the type of hearing loss. Thus, this is the correct procedure for the test.

Choice C rationale

Placing the tuning fork on the mastoid bone and then over air is actually part of the Rinne test, not the Weber test. This choice is, therefore, incorrect for the Weber test.

Choice D rationale

Similar to Choice C, this process describes the Rinne test, which compares air conduction and bone conduction of sound. This is not the correct method for performing Weber’s test.

A. More prone to injury and calcifications than other locations in the breast. B. Where most of the suspensory ligaments attach. C. The largest quadrant of the breast. D. The location of most breast tumors.

Correct Answer is D

Explanation

Choice A rationale

While the upper outer quadrant can be prone to injury and calcifications, this is not the primary reason for its importance in breast examinations. Calcifications can occur in various parts of the breast and are often detected through mammography rather than physical examination.

Choice B rationale

Suspensory ligaments, also known as Cooper's ligaments, provide structural support to the breast. They attach to the skin and the underlying pectoral fascia. However, these ligaments are distributed throughout the breast and are not confined to the upper outer quadrant.

Choice C rationale

The upper outer quadrant is not the largest quadrant of the breast. All quadrants have relatively similar sizes. Therefore, the size of the quadrant is not the reason for its importance in breast examinations.

Choice D rationale

The upper outer quadrant of the breast is the most common location for breast tumors. This is because a significant portion of the breast tissue, including the axillary tail (an extension of breast tissue into the armpit), is located in this quadrant. Therefore, careful examination of this area is crucial for early detection of breast cancer.

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A student nurse is reviewing for an upcoming examination and recognizes in the ECG readings that the QRS wave represents which of the following?

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Naxlex Comprehensive Predictor Exams

The nurse plans to assess the client's hearing.What action should the nurse take when performing the Weber's test?

Correct Answer is B

Explanation

In performing a breast examination, the nurse knows that examining the upper outer quadrant of the breast is especially important.The reason for this is that the upper quadrant is:

Correct Answer is D

Explanation

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