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Objective The objective of our study is to investigate the impact of nutritional risk of hospitalized cardiac operation patients on admission on the clinical outcome.Methods With the application of cross-sectional study method totally 485 opened chest patients of the cardiac surgery in our hospital were enrolled from January to June in 2012 to adopt the NRS2002.The patients of NRS score ≥ 3 is classified as nutritional risk group A(group A) while the patients of NRS score< 3 is classified as nutritional risk group B (group B).Observation items 1.The incidence of adverse clinical outcomes in hospitalized patients (Hospital mortality and postoperative hospitalization time ≥ 15 days).2.The hospitalization time of two groups of patients.3.he time of guardianship after operation.Results ①.64 cases of 485 cases of preoperative patients with NRS2002 ≥ 3 points are accounted for 13.2%.②.Nutritional risk score and nutrition indexes of admission are consistency such as body mass index, serum total protein, albumin, prealbumin, hemoglobin (P < 0.05).③.The possibility of adverse clinical outcomes in group A was significantly higher than that of B group.The time of guardianship in A group was larger than B group.there is not a significant difference among the two groups of hospitalization time.Conclusion It will increase that the possibility of adverse clinical outcomes in patients with nutritional risk before heart operation.while the monitored time may be extended.This should arouse the attention before operation for all the medical staff.