Question

Mrs. Bigda, a 60-year-old woman, was brought to the hospital by the police after falling to the pavement. She is found to have alcoholic hepatitis. She is put on a salt- and protein-restricted diet and diuretics are prescribed to manage her ascites (accumulated fluid in the peritoneal cavity). How will diuretics reduce this excess fluid? Name and describe the mechanisms of action of three types of diuretics. Why is her diet salt-restricted?

Accepted Answer

Step 1: Understand the clinical context—Mrs. Bigda has ascites, which is the accumulation of excess fluid in the peritoneal cavity, often due to liver dysfunction such as alcoholic hepatitis. This fluid buildup is related to imbalances in fluid and electrolyte regulation, including sodium retention. Step 2: Explain how diuretics reduce excess fluid—Diuretics promote the excretion of sodium and water by the kidneys, which decreases blood volume and reduces the hydrostatic pressure that pushes fluid into the peritoneal cavity. This helps mobilize and eliminate the ascitic fluid. Step 3: Describe the mechanism of action of three types of diuretics: (a) Loop diuretics (e.g., furosemide) inhibit the Na	extsuperscript{+}-K	extsuperscript{+}-2Cl	extsuperscript{-} symporter in the thick ascending limb of the loop of Henle, causing significant sodium and water loss; (b) Thiazide diuretics inhibit the Na	extsuperscript{+}-Cl	extsuperscript{-} symporter in the distal convoluted tubule, leading to moderate sodium and water excretion; (c) Potassium-sparing diuretics (e.g., spironolactone) antagonize aldosterone receptors in the collecting duct, reducing sodium reabsorption and potassium excretion, which is especially useful in liver disease to prevent hypokalemia. Step 4: Explain why the diet is salt-restricted—A salt-restricted diet limits sodium intake, which helps prevent further sodium and water retention by the kidneys. This reduces the formation of ascitic fluid and complements the action of diuretics in managing fluid overload. Step 5: Summarize the integrated approach—Combining salt restriction with diuretics targets both the cause (sodium retention) and the symptom (fluid accumulation), improving the patient's condition by reducing ascites and preventing complications.

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Concetti chiave

Mechanism of Diuretics in Reducing Ascites

Types and Mechanisms of Diuretics

Rationale for Salt-Restricted Diet in Ascites Management