A nurse who is mentoring a graduate nurse explains the correlation between severe blood loss and the effect on the client's mean arterial pressure (MAI The graduate nurse demonstrates correct understanding when he states which of the following:

It raises cardiac output and MAP.

It causes vasoconstriction and increased MAP.

There is no direct correlation to MAP.

Lower blood volume lowers MAP.

Answer and Explanation

The Correct Answer is D

A.   Severe blood loss actually decreases blood volume, which leads to decreased cardiac output and ultimately lower MAP.
B.   While it's true that the body initially responds to blood loss by vasoconstricting to maintain blood pressure, this compensatory mechanism can only last for so long. As blood loss continues, MAP will decrease.
C.   There is no direct correlation to MAP. MAP is directly influenced by cardiac output and systemic vascular resistance (SVR). Blood volume is a major determinant of both.
D.   A decrease in blood volume leads to decreased preload, which reduces cardiac output. This, in turn, lowers MAP.

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Correct Answer is A

Explanation

A. Abnormally prominent U wave is a classic sign of hypokalemia. The U wave is normally small and often hidden by the T wave. When it becomes prominent, it's a strong indicator of low potassium levels.
B. Inverted P wave is more indicative of atrial abnormalities, such as atrial fibrillation.
C. Elevated ST segment is often associated with myocardial ischemia or injury.
D. Wide QRS is more characteristic of conduction disturbances like bundle branch blocks.

A. Atrial fibrillation B. Sinus bradycardia C. Sinus tachycardia D. First-degree AV block

Correct Answer is A

Explanation

A. Atrial fibrillation is consistent with the symptoms described. It causes irregular palpitations and dizziness due to the rapid and irregular ventricular rate. The significant pulse deficit can occur because the irregular rhythm may lead to intermittent weak or absent pulses. The ECG typically shows an irregular rhythm with no identifiable P waves and an irregularly irregular ventricular response.
B. Sinus bradycardia does not usually cause a rapid and irregular heart rate. It is characterized by a regular rhythm with a slow heart rate. While it can cause fatigue and dizziness, it does not typically present with an irregular rhythm or a significant pulse deficit. Therefore, it is less consistent with the symptoms described.
C. Sinus tachycardia is characterized by a rapid but regular heart rate. It does not typically present with an irregular rhythm or significant pulse deficit. While it may cause symptoms such as palpitations and

dizziness, the regular rhythm and absence of irregularity in the ECG make it less likely to be the cause of the significant irregular pulse deficit described.
D. First-degree AV block does not usually cause a rapid and irregular heart rate. It typically presents with a regular rhythm but with a prolonged PR interval. It is not typically associated with irregular palpitations or a significant pulse deficit. The symptoms described are not characteristic of first-degree AV block.

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A nurse who is mentoring a graduate nurse explains the correlation between severe blood loss and the effect on the client's mean arterial pressure (MAI The graduate nurse demonstrates correct understanding when he states which of the following:

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Naxlex Comprehensive Predictor Exams

A nurse is reviewing the EKG strip of a client who has prolonged vomiting. Which of the following abnormalities on the client's EKG should the nurse interpret as a sign of hypokalemia?

Correct Answer is A

Explanation

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Correct Answer is A

Explanation

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