Pathophysiology for Coders Flashcards

A patient with cirrhosis develops esophageal varices. What pathophysiological mechanism creates this condition?

Answer: Portal hypertension forces blood through collateral pathways including esophageal veins

Cirrhosis increases portal flow resistance. Blood seeks alternative pathways including the esophageal venous plexus, which dilates under pressure.

What is the pathophysiological basis for anemia of chronic kidney disease?

Answer: Damaged kidneys produce insufficient erythropoietin, reducing bone marrow stimulation

Healthy kidneys produce EPO. As function declines, EPO production decreases, leading to reduced red cell production.

A provider documents 'COPD with acute exacerbation' and 'cor pulmonale.' What connects these?

Answer: Chronic hypoxia causes pulmonary vasoconstriction leading to right heart strain

COPD causes chronic hypoxia, triggering pulmonary vasoconstriction and eventually pulmonary hypertension and right heart failure.

What pathophysiological process causes kidney involvement in SLE?

Answer: Autoantibodies and immune complexes deposit in glomeruli, triggering inflammation

Autoantibodies form immune complexes that deposit in the glomerular basement membrane, activating complement and triggering inflammation.

Why does untreated hypothyroidism increase cardiovascular risk?

Answer: Hypothyroidism elevates LDL, promotes diastolic hypertension, and increases vascular resistance

Thyroid hormones regulate lipid metabolism and vascular tone. Low levels raise LDL, increase vascular resistance, and promote endothelial dysfunction.

A patient with severe burns develops acute kidney injury on day 3 post-injury. What mechanism is responsible?

Answer: Massive fluid shifts, hypovolemia, and myoglobin release from damaged muscle

Severe burns cause massive fluid loss (hypovolemia) and muscle damage releases myoglobin, which is toxic to renal tubules.