Enteral nutrition is crucial for ensuring that critically ill patients have a proper intake of food, water, and medicine. Methods to ensure this requirement should be initiated as early as possible. The use of PPF has several advantages compared to the use of a nasogastric feeding tube. In the present paper, the cases of three critically ill patients with a nonfunctional gastrointestinal system on admission to ICU, are detailed. Enteral feeding through a nasogastric tube by prokinetic agent therapy had been unsuccessful. The bedside placement of a post-pyloric feeding tube by the DRX-Revolution X-ray system is described.