An elderly patient has been having copious vomiting for several days and has become lethargic and weak. His mucous membranes are dry. He has poor skin turgor. Lab work shows: sodium of 145, ABGs: pH 7.58, PCO2 38, HCO3 38, PO2 95, SO2 98. Which response best explains the patient’s lethargy and weakness?
The hypokalemia brought on severe muscle spasms, causing exhaustion.
Due to his low potassium, his cells rely on glycolysis.
Due to the hypokalemia, his cells are hyperpolarized.
The hypernatremia caused cellular dehydration, leading to lethargy.
The Correct Answer is D
Choice A rationale
Hypokalemia can cause muscle weakness and cramps, but it does not typically lead to severe muscle spasms causing exhaustion. The patient’s symptoms of lethargy and weakness are more likely related to electrolyte imbalances and dehydration rather than muscle spasms.
Choice B rationale
While low potassium levels can affect cellular metabolism, the primary issue here is not glycolysis. The patient’s symptoms are more consistent with dehydration and electrolyte imbalances rather than a metabolic shift to glycolysis.
Choice C rationale
Hypokalemia can cause cells to become hyperpolarized, leading to muscle weakness and decreased reflexes. However, the patient’s symptoms of lethargy and weakness are more likely due to dehydration and electrolyte imbalances rather than cellular hyperpolarization.
Choice D rationale
Hypernatremia, or high sodium levels, can cause cellular dehydration, leading to symptoms such as lethargy and weakness. The patient’s lab results and clinical presentation are consistent with hypernatremia-induced cellular dehydration, which explains his symptoms.
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View Related questions
Correct Answer is A
Explanation
Choice A rationale
Septic shock is characterized by a systemic inflammatory response to infection, leading to vasodilation, increased capillary permeability, and hypotension. The patient’s elevated temperature, tachycardia, and hypotension are consistent with septic shock. In septic shock, the body’s response to infection leads to widespread inflammation and impaired tissue perfusion.
Choice B rationale
Hypovolemic shock is caused by a significant loss of blood or fluids, leading to decreased circulating volume and hypotension. While the patient’s hypotension and tachycardia could be consistent with hypovolemic shock, the elevated temperature suggests an infectious process, making septic shock more likely.
Choice C rationale
Cardiogenic shock is caused by the heart’s inability to pump effectively, leading to decreased cardiac output and tissue perfusion. While hypotension and tachycardia are consistent with cardiogenic shock, the elevated temperature is not a typical finding. Cardiogenic shock is usually associated with conditions like myocardial infarction or severe heart failure.
Choice D rationale
Neurogenic shock is caused by a disruption in the autonomic pathways, leading to vasodilation and hypotension. It is typically associated with spinal cord injuries or severe head trauma. The patient’s elevated temperature and tachycardia are not consistent with neurogenic shock, making septic shock the more likely diagnosis.
Correct Answer is C
Explanation
Choice A rationale
Urine specific gravity of 1.029 indicates concentrated urine, which is common in dehydration but not specific to prerenal AKI. It reflects the kidney’s ability to concentrate urine in response to fluid deficit.
Choice B rationale
BUN of 28 mg/dL can indicate dehydration or renal impairment. However, it is not as specific as creatinine in diagnosing prerenal AKI. BUN can be elevated due to other factors like high protein intake or gastrointestinal bleeding.
Choice C rationale
Creatinine of 2.4 mg/dL is a critical indicator of kidney function. Elevated creatinine levels are more specific to renal impairment, including prerenal AKI, as they reflect the kidney’s ability to filter waste products.
Choice D rationale
Dry mucous membranes are a sign of dehydration but are not specific to prerenal AKI. They indicate fluid volume deficit but do not directly reflect kidney function.