This is a prospective, randomized controlled clinical trail that involved patients with Chronic Obstructive Pulmonary Disease.The goal of this clinical trial is to compare the clinical effect of Oral Tubes vs Nasogastric Tubes in patients with Chronic Obstructive Pulmonary Disease. The main questions it aims to answer are:
Compared to Nasogastric Tube Feeding, can the Oral esophageal Tube Feeding better improve the nutritional status and pulmonary infection
Participants will be divided into two groups randomly, with different nutritional support respectively.
