Which of the following pulse pressures would be considered low or narrow for a systolic pressure of 160 mmHg?
25 mmHg
40 mmHg
50 mmHg
45 mmHg
The Correct Answer is A
A. 25 mmHg: Pulse pressure is calculated as systolic minus diastolic pressure. A normal pulse pressure is approximately 30–40 mmHg. With a systolic pressure of 160 mmHg, a pulse pressure of 25 mmHg would be considered narrow, suggesting reduced stroke volume, increased systemic vascular resistance, or conditions such as heart failure or aortic stenosis.
B. 40 mmHg: A pulse pressure of 40 mmHg falls within the normal expected range for most adults. Even with an elevated systolic pressure of 160 mmHg, a 40 mmHg difference would not be considered narrow and generally reflects adequate stroke volume.
C. 50 mmHg: A pulse pressure of 50 mmHg is wider than normal and may indicate increased stroke volume or decreased arterial compliance, as seen in conditions like aortic regurgitation or aging arteries.
D. 45 mmHg: A pulse pressure of 45 mmHg is slightly above the typical normal range and would be considered normal to mildly widened. It does not represent a low or narrow pulse pressure in the context of a systolic pressure of 160 mmHg.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Diastolic pressure is the higher number in a blood pressure reading: In a standard blood pressure measurement (e.g., 120/80 mmHg), the systolic value is the higher number and reflects peak arterial pressure during ventricular contraction. Diastolic pressure is the lower value, representing arterial pressure when the heart is at rest between beats.
B. Diastolic pressure occurs when the heart is relaxed between beats: Diastolic pressure reflects the arterial pressure during ventricular relaxation (diastole). During this phase, the ventricles fill with blood, and the elastic recoil of the arteries maintains baseline pressure in the circulation, ensuring continuous perfusion of tissues.
C. Systolic pressure occurs during ventricular relaxation, and diastolic pressure occurs during ventricular contraction: Systolic pressure corresponds to ventricular contraction (systole), when blood is ejected into the aorta, producing the highest arterial pressure. Diastolic pressure occurs during ventricular relaxation, not contraction.
D. Systolic pressure represents the lower value in a blood pressure reading: Systolic pressure is the higher value because it reflects the force generated when the left ventricle contracts and propels blood into systemic circulation. The lower value is diastolic pressure, maintained by arterial elasticity and peripheral resistance during cardiac relaxation.
Correct Answer is B
Explanation
A. Are the largest arteries in the body: Arterioles are not the largest arteries; those are the aorta and elastic arteries. Arterioles are much smaller in diameter, located distal to arteries, and play a crucial role in controlling flow into capillary beds.
B. Slow down blood flow and regulate blood pressure: Arterioles are called resistance vessels because their small diameter and muscular walls allow them to constrict or dilate, significantly altering vascular resistance. By controlling resistance, they regulate blood flow to tissues and contribute to systemic blood pressure maintenance.
C. Help increase blood pressure by vasodilation: Vasodilation of arterioles reduces resistance and generally lowers systemic blood pressure. Increasing blood pressure is associated with vasoconstriction, not dilation.
D. Transport blood directly to the heart: Arterioles do not transport blood to the heart; veins and venules return blood to the heart. Arterioles distribute blood from arteries to capillary networks, controlling local perfusion.
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