[Study of paracetamol levels in serum samples as predictive indicator of gastric emptying].

Introduction: According to numerous studies, early initiation of nutrition in patients who have undergone surgery is essential.

Objetives: We analyzed the available techniques to assess gastric emptying in critically ill patients undergoing surgery, and holding the decision to introduce the type of feeding route.

Results: The measurement of gastric residual volume and auscultation are the standard tests used, but they have not shown great effectiveness.