A Study About Nutritional Support of Enhanced Protein in Critical Patients

This is a prospective randomized controlled trial. 180 patients with critical illness will be included and randomly divided into two groups. In the control group, patients will be fed with basic energy; and in the experiment group, the patients will be given extra protein intake except the basic energy intake. The intervention duration will last 6 days. The primary outcomes of this study are urea nitrogen of 24h and prealbumin(PA). And other outcomes include nutritional status, safety indicators and clinical indicators.