This study evaluates the effect of Vitamin D supplementation on ICU and hospital LOS in patients undergoing valve replacement surgery. Half of the patients will receive Alfacalcidol, while the other half-the control group- will be exposed to the same environment without receiving alfacalcidol.
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hospital length of stay
Timeframe: time to hospital discharge, up to 15 days
intensive-care unite length of stay
Timeframe: time to ICU discharge, up to 7 days