Influence of Preoperative Nutritional Status on Perioperative Period in Cardiac Surgery in Patients With Frailty

The aim of the study is to determine whether the optimisation of the preoperative nutritional status affects the course of the perioperative period in patients with frailty. Subjects: Patients 65 and over years of age with frailty or risk of it, with suboptimal nutritional status who are prescribed to elective cardiac surgery . Research methods: Edmonton Crispness Scale, a Mini Nutritional Assessment (MNA-SF) test will be used to select subjects. Body composition will be examined by bioelectrical impedance analysis (BIA) to determine the degree of phase angle. Changes in laboratory blood tests will be recorded and evaluated The subjects randomly will be divided into control and study groups. The diet of the patients in the study group will be optimised by protein supplements before elective heart surgery. The benefits of optimising nutritional status will be evaluated comparing laboratory blood tests, changes in organ function, adverse outcomes, the need for vasoactive drugs, artificial lung ventilation time and length of hospitalisation between the groups.