Which of the following individuals is most at-risk for developing prerenal failure?
An elderly individual with heart failure
A healthy young adult with normal fluid intake
A pregnant woman in the third trimester
A marathon runner in peak physical condition
The Correct Answer is A
A. Heart failure patients suffer from reduced cardiac output, which directly decreases effective arterial blood volume and renal perfusion. The elderly are more susceptible due to age-related declines in the glomerular filtration rate and a diminished compensatory response. This hypoperfusion triggers prerenal azotemia as the kidneys receive insufficient blood to maintain filtration.
B. A healthy young adult maintaining normal fluid intake has stable hemodynamics and adequate renal blood flow to support metabolic demands. Their kidneys are not subjected to the pressure or volume deficits that characterize the prerenal state. Without significant dehydration or cardiac impairment, the risk for developing acute kidney injury in this population remains negligible.
C. Pregnancy typically involves a physiological increase in blood volume and cardiac output, which generally enhances renal perfusion and filtration. While complications like preeclampsia can occur, the state of pregnancy itself is not a primary risk factor for prerenal failure. Normal gestational changes facilitate improved clearance of metabolic waste products through the renal system.
D. A marathon runner in peak condition possesses an efficient cardiovascular system that maintains tissue oxygenation and adequate vascular pressures during exertion. While extreme dehydration can lead to prerenal issues, the prompt "peak physical condition" implies a balanced physiological state. They are less likely to experience the chronic perfusion deficits seen in patients with cardiac failure.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Elevated high-density lipoprotein (HDL) cholesterol levels: HDL is often referred to as "good" cholesterol because it facilitates the transport of lipids from the tissues back to the liver. High levels of HDL are generally considered cardioprotective and are not a diagnostic criterion for dyslipidemia. Dyslipidemia typically involves a decrease in HDL, which contributes to an increased risk of atherosclerosis.
B. Decreased triglyceride levels: This is not a criterion for dyslipidemia; in fact, dyslipidemia is characterized by hypertriglyceridemia, or elevated levels of triglycerides. High triglyceride levels contribute to the thickening of arterial walls and increase the risk of pancreatitis. Clinicians look for elevations in these fatty acids when diagnosing metabolic syndrome or lipid disorders.
C. Normal total cholesterol levels: By definition, dyslipidemia involves abnormal lipid levels, so normal total cholesterol would not be used to meet the diagnostic criteria for this condition. A diagnosis requires at least one component of the lipid panel, such as LDL, HDL, or triglycerides, to be outside the healthy physiological range. Normal values indicate a healthy lipid metabolism.
D. Elevated low-density lipoprotein (LDL) cholesterol levels: LDL is the primary carrier of cholesterol in the blood and is highly associated with the development of atherosclerotic plaques when present in excess. An elevated LDL level is a central component of the diagnostic criteria for dyslipidemia. Reducing these levels is a primary goal of pharmacologic and lifestyle interventions to prevent cardiovascular disease.
Correct Answer is D
Explanation
A. Blood glucose levels are essential for monitoring diabetes mellitus, which is a leading cause of renal failure, but they do not measure kidney function. High glucose levels indicate poor metabolic control rather than the degree of nephron loss or filtration impairment. They are an indirect risk factor rather than a diagnostic tool for renal staging.
B. Urinary pH and specific gravity provide information about the concentration of urine and the kidney's ability to acidify it, but they are non-specific. These values fluctuate significantly based on hydration status and diet and do not quantify the glomerular filtration rate. They are used for general screening rather than assessing the severity of CKD.
C. Blood urea nitrogen (BUN) levels reflect the concentration of urea in the blood, but they are heavily influenced by diet, protein intake, and hydration. While BUN typically rises in renal failure, it is not as reliable or specific as creatinine for calculating filtration capacity. It is considered a secondary marker in the assessment of renal health.
D. Serum creatinine and the estimated glomerular filtration rate (eGFR) are the primary clinical standards used to diagnose and stage chronic kidney disease. Creatinine is a metabolic byproduct excreted almost entirely by glomerular filtration, making it a reliable marker. The eGFR provides a numerical value that directly correlates with the percentage of remaining kidney function.
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