Description of Implementation Strategy
Implementation and Audit
-- All pre-dialysis patients who are following a protein-restricted diet should have B vitamin supplementation. Most proprietary formulations have an adequate amount of the required vitamins. One or two B vitamin complex tablets daily is usually adequate. The prescribing physician should ensure that the prescribed medication contains the recommended content.
-- The diet could be supplemented with at least 1 mg of folate per day. Higher doses may be required in cases of erythropoietin administration. If available, therapy efficacy and compliance could be followed by regularly taking blood homocysteine levels.
-- Vitamin C supplementation may be appropriate to assist supplementary oral iron absorption (see separate iron and erythropoietin guidelines). Mega-dosing of vitamin C (e.g., prevention of common cold) must be avoided.
-- Parathyroid hormone level should be measured once glomerular filtration rate (GFR) is below 60 mL/min. Regular monitoring of parathyroid hormone (PTH) levels (3–6 monthly) should be performed, and oral vitamin D dose should be adjusted to maintain near-normal PTH levels. Pulse oral dosing (two or three days per week) has a greater effect in lowering PTH levels, with less provocation of hypercalcaemia. Care must be taken not to induce hypercalcaemia with supplementary vitamin D therapy, which may result in nephrolithiasis, and exacerbate renal failure. Regular review of the patient's diet by a renal dietician must also occur, as the calcium content of foods in the diet may vary (e.g., calcium-supplemented foods, milks and juices).
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