The most common cause of prerenal acute kidney injury (AKI) is:
Hyperperfusion
Caused by ischemia
Nephrotoxic drugs
Urinary tract obstruction
The Correct Answer is B
Choice A reason: Hyperperfusion, or excessive renal blood flow, is not a common cause of prerenal AKI. Prerenal AKI results from reduced renal perfusion, like hypovolemia or hypotension, not increased flow, making this an incorrect cause for the condition.
Choice B reason: Ischemia, due to reduced renal perfusion from hypovolemia, hypotension, or shock, is the most common cause of prerenal AKI. It impairs glomerular filtration, leading to acute renal dysfunction, reversible with restored perfusion, making this the correct cause.
Choice C reason: Nephrotoxic drugs cause intrinsic AKI by directly damaging renal tubules, not prerenal AKI, which stems from reduced blood flow. While significant, nephrotoxicity is less common than ischemic causes in prerenal AKI, making this incorrect.
Choice D reason: Urinary tract obstruction causes postrenal AKI by blocking urine outflow, not prerenal AKI, which involves pre-renal hypoperfusion. Obstruction is a distinct mechanism, less frequent than ischemia in prerenal cases, making this an incorrect cause.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A reason: Pyuria, urgency, and frequency are typical UTI symptoms, but elderly patients often present with atypical signs like confusion. Confusion is more prominent in this age group, so this is less specific and incorrect.
Choice B reason: Dysuria, frequency, and suprapubic pain are common UTI symptoms, but elderly patients may show confusion instead of classic signs. Confusion and frequency are more likely, so this is incorrect.
Choice C reason: In elderly patients (85 years), UTIs often cause confusion due to altered mental status, alongside frequency. Atypical symptoms like confusion are common, making this the correct manifestation for this age group.
Choice D reason: Hematuria and flank pain suggest complicated UTIs or kidney issues, not typical in elderly UTI presentation. Confusion and frequency are more expected, so this is incorrect.
Correct Answer is C
Explanation
Choice A reason: Smoking is a significant risk factor for ischemic stroke, contributing to vascular damage. However, hypertension has a stronger association, directly causing arterial stress and clot formation, so this is less critical than hypertension.
Choice B reason: Diabetes increases stroke risk by promoting atherosclerosis, but its impact is less immediate than hypertension, which directly elevates arterial pressure and stroke likelihood. Thus, diabetes is incorrect as the most significant factor.
Choice C reason: Hypertension is the most significant risk factor for ischemic stroke, as it damages arteries, promotes clot formation, and increases stroke incidence. Isky’s history highlights this as the primary contributor, making it correct.
Choice D reason: Age (65) is a stroke risk factor, but hypertension’s direct impact on vascular health outweighs age alone. Isky’s controllable risk factor, hypertension, is more significant, so this is incorrect.
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