What is the main hemodynamic parameter that measures preload?
Systolic Blood Pressure.
Mean Arterial Blood Pressure.
Central Venous Pressure (CVP).
Systemic Vascular Resistance.
The Correct Answer is C
Choice A reason: Systolic Blood Pressure is not a direct measure of preload; it indicates the pressure in the arteries during the contraction of the heart muscles.
Choice B reason: Mean Arterial Blood Pressure is an average blood pressure in an individual during a single cardiac cycle, but it does not specifically measure preload.
Choice C reason: Central Venous Pressure (CVP) is a direct measure of the blood volume returning to the heart and the ability of the heart to pump the blood into the arterial system, making it a key indicator of preload.
Choice D reason: Systemic Vascular Resistance refers to the resistance to blood flow offered by all of the systemic vasculature, excluding the pulmonary vasculature, and is not a measure of preload.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason: An INR of 0.9 is within the normal range (0.8-1.2) and does not support the presence of bruising or bleeding disorders.
Choice B reason: A hematocrit level of 28% is below the normal range (36%-50% for women, 40%-54% for men), indicating anemia, but it does not directly explain bruising or petechiae.
Choice C reason: A WBC count of 4500 is within the normal range (4500-11000), suggesting that there is no active infection or leukocytosis that would explain the bruising.
Choice D reason: A platelet count of 60000 is below the normal range (150000-450000), which can lead to easy bruising and petechiae, supporting the nurse's observation.
Correct Answer is B
Explanation
Choice A reason: Stroke Volume refers to the amount of blood pumped by the left ventricle of the heart in one contraction, not to the regulation of fluid volume and cardiac output.
Choice B reason: Renin-Angiotensin-Aldosterone-System (RAAS) is responsible for vasoconstriction, sodium retention, and water reabsorption, which helps to increase circulating fluid volume and cardiac output.
Choice C reason: Brain and Atrial natriuretic peptides (BNP & ANP) actually work to decrease blood volume and pressure, not increase them.
Choice D reason: Erythropoietin primarily stimulates red blood cell production and does not directly affect fluid volume or cardiac output.
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