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A 51-year-old woman comes to the office because of fatigue and progressive exertional dyspnea during the past several months. She has not had fever, cough, chest pain, palpitations, or weight loss. She has a history of type 2 diabetes mellitus and hyperlipidemia and takes glyburide and simvastatin. Screening colonoscopy 1 year ago showed no abnormalities. The patient does not smoke cigarettes, drink alcohol, or use illicit drugs. BMI is 32 kg/m2. Her temperature is 37.0°C (98.6°F), pulse is 92/min, respirations are 12/min, and blood pressure is 115/70 mm Hg. Pulse oximetry on room air shows an oxygen saturation of 99%. Physical examination shows mucosal and conjunctival pallor. The lungs are clear to auscultation. Cardiac examination discloses no murmurs. The abdomen is nontender to palpation. No peripheral edema is noted. Laboratory studies show:Hemoglobin 8.8 g/dLMean corpuscular volume 79 μm3Leukocyte count 6,300/mm3Platelet count 210,000/mm3Reticulocyte count 0.4%Hemoglobin A1c 7.8%Serum   Sodium 140 mEq/L   Potassium 4.3 mEq/L   Creatinine 0.9 mg/dL   Thyroid-stimulating hormone 1.2 μU/mLTest of the stool for occult blood is negative. Chest x-ray shows no abnormalities. Which of the following is the most likely underlying pathophysiology causing anemia in this patient?A. Acquired inhibition of aminolevulinic acid synthaseB. Immune-mediated hemolysisC. Increased erythrocyte recycling by macrophagesD. Intermittent nocturnal hypoxemiaE. Release of inflammatory cytokines

Question

A 51-year-old woman comes to the office because of fatigue and progressive exertional dyspnea during the past several months. She has not had fever, cough, chest pain, palpitations, or weight loss. She has a history of type 2 diabetes mellitus and hyperlipidemia and takes glyburide and simvastatin. Screening colonoscopy 1 year ago showed no abnormalities. The patient does not smoke cigarettes, drink alcohol, or use illicit drugs. BMI is 32 kg/m2. Her temperature is 37.0°C (98.6°F), pulse is 92/min, respirations are 12/min, and blood pressure is 115/70 mm Hg. Pulse oximetry on room air shows an oxygen saturation of 99%. Physical examination shows mucosal and conjunctival pallor. The lungs are clear to auscultation. Cardiac examination discloses no murmurs. The abdomen is nontender to palpation. No peripheral edema is noted. Laboratory studies show:Hemoglobin 8.8 g/dLMean corpuscular volume 79 μm3Leukocyte count 6,300/mm3Platelet count 210,000/mm3Reticulocyte count 0.4%Hemoglobin A1c 7.8%Serum   Sodium 140 mEq/L   Potassium 4.3 mEq/L   Creatinine 0.9 mg/dL   Thyroid-stimulating hormone 1.2 μU/mLTest of the stool for occult blood is negative. Chest x-ray shows no abnormalities. Which of the following is the most likely underlying pathophysiology causing anemia in this patient?A. Acquired inhibition of aminolevulinic acid synthaseB. Immune-mediated hemolysisC. Increased erythrocyte recycling by macrophagesD. Intermittent nocturnal hypoxemiaE. Release of inflammatory cytokines

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Solution

The patient's symptoms and lab results suggest that she is suffering from anemia, as indicated by her fatigue, exertional dyspnea, and notably low hemoglobin level. The mean corpuscular volume (MCV) is low, indicating that the anemia is microcytic. The reticulocyte count is also low, suggesting that the anemia is likely due to a lack of production rather than increased destruction or loss.

Given the patient's history of type 2 diabetes mellitus, the most likely underlying pathophysiology causing anemia in this patient is the release of inflammatory cytokines (Choice E). Chronic diseases such as diabetes are often associated with anemia of chronic disease (also known as anemia of inflammation). This is due to the fact that inflammatory cytokines interfere with erythropoiesis, the process of producing new red blood cells.

The other options are less likely given the patient's history and lab results:

A. Acquired inhibition of aminolevulinic acid synthase is associated with lead poisoning, which is not suggested by the patient's history or symptoms.

B. Immune-mediated hemolysis would typically present with a higher reticulocyte count due to the body trying to compensate for the destruction of red blood cells.

C. Increased erythrocyte recycling by macrophages is associated with conditions like hemolytic anemia or splenomegaly, which are not suggested by the patient's history or symptoms.

D. Intermittent nocturnal hypoxemia is associated with conditions like obstructive sleep apnea, which is not suggested by the patient's history or symptoms.

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