CCHT Exam

Proper nutrition is essential for dialysis patients to maintain adequate energy levels, prevent malnutrition, control fluid and electrolyte balance, minimize uremic symptoms, and reduce cardiovascular risk. Malnutrition is common in dialysis patients and is associated with increased morbidity and mortality.

Dialysis patients require higher protein intake than the general population because the dialysis process removes amino acids and proteins from the blood. The recommended protein intake for hemodialysis patients is 1.0–1.2 grams per kilogram of ideal body weight per day. At least 50% of protein intake should come from high biological value sources such as eggs, meat, fish, poultry, and dairy products. Inadequate protein intake leads to muscle wasting, weakened immune function, poor wound healing, and decreased albumin levels.

Adequate caloric intake is necessary to prevent the body from using protein for energy. The recommended caloric intake is 30–35 kilocalories per kilogram of ideal body weight per day, adjusted based on age, activity level, and nutritional status. Patients should obtain calories primarily from carbohydrates and unsaturated fats while limiting saturated and trans fats.

Sodium restriction is crucial for controlling thirst, fluid retention, blood pressure, and cardiovascular risk. The recommended sodium intake is generally 2,000–3,000 mg per day, though individual recommendations vary based on residual kidney function and interdialytic weight gain. High-sodium foods to avoid include processed meats, canned soups and vegetables, pickles, soy sauce, fast food, and salty snacks. Patients should be educated to read food labels and choose low-sodium alternatives.

Potassium balance is critical because both hyperkalemia (high potassium) and hypokalemia (low potassium) can cause life-threatening cardiac arrhythmias. Most hemodialysis patients require potassium restriction, typically 2,000–3,000 mg per day. High-potassium foods to limit or avoid include bananas, oranges, potatoes, tomatoes, avocados, spinach, beans, nuts, chocolate, and salt substitutes containing potassium chloride. Cooking methods such as leaching (soaking cut vegetables in water and discarding the water before cooking) can reduce potassium content.

Phosphorus accumulates when the kidneys fail, leading to secondary hyperparathyroidism, renal osteodystrophy, and cardiovascular calcification. The recommended phosphorus intake is 800–1,000 mg per day. High-phosphorus foods to limit include dairy products, nuts, seeds, beans, whole grains, processed meats, colas, and foods with phosphate additives. Most dialysis patients require phosphate binders taken with meals to prevent phosphorus absorption from the gastrointestinal tract.

Calcium metabolism is disrupted in kidney failure due to decreased calcitriol production, phosphorus retention, and secondary hyperparathyroidism. Calcium intake should be monitored carefully because both hypocalcemia and hypercalcemia can occur. Calcium-based phosphate binders contribute to calcium intake. Patients on calcium-containing binders should generally limit total elemental calcium intake (from diet and binders) to 1,500–2,000 mg per day to prevent vascular calcification.

Fluid restriction is necessary for most hemodialysis patients because the kidneys can no longer excrete adequate amounts of fluid. The recommended fluid intake depends on residual urine output and is typically calculated as urine output plus 500–1,000 mL per day. Interdialytic weight gain (weight gain between dialysis sessions) should ideally be limited to 2–3 kg or less than 4–5% of dry weight. Excessive fluid intake leads to hypertension, pulmonary edema, and cardiovascular stress.

Strategies to manage thirst include sucking on ice chips (counting them as fluid intake), using sugar-free hard candies or gum, taking medications with meals to reduce extra fluid, keeping the mouth moist with lip balm or mouthwash, and controlling sodium intake.

Water-soluble vitamins (B vitamins and vitamin C) are removed during dialysis and must be supplemented. Dialysis patients typically take a renal-specific multivitamin daily. Vitamin D (calcitriol or its analogs) is prescribed to manage secondary hyperparathyroidism. Iron supplementation is often necessary to support erythropoietin therapy and treat anemia. Fat-soluble vitamins (A, E, K) are generally not supplemented because they can accumulate.

Regular nutritional assessment is essential for dialysis patients. Parameters monitored include body weight and changes over time, serum albumin (target greater than 4.0 g/dL), prealbumin, subjective global assessment (SGA), normalized protein catabolic rate (nPCR), dietary intake records, and anthropometric measurements such as skinfold thickness and mid-arm muscle circumference.

Diabetic dialysis patients must balance blood glucose control with adequate nutrition. Carbohydrate counting and insulin adjustment are important. Patients with poor appetite may benefit from oral nutritional supplements, appetite stimulants, or intradialytic parenteral nutrition. Cultural and religious dietary practices should be respected while providing appropriate nutritional guidance.