[Effects of nasogastric and percutaneous endoscopic gastrostomy tube feeding on the susceptibility of pulmonary infection in long-term coma patients with stroke or traumatic brain injury].

Objective: To investigate the effects of nasogastric tube (NGT) and percutaneous endoscopic gastrostomy (PEG) tube feeding on the susceptibility of pulmonary infection in long-term coma patients with stroke or traumatic brain injury. Methods: A total of 295 candidates who were in long-term coma after stroke or traumatic brain injury but without pulmonary infection and eligible for PEG catheterization were screened prospectively between January 2014 and February 2018. The patients were divided into PEG group (86 patients) and NGT group (209 patients) according to the choice of next-of-kin. Data related to the susceptibility of pulmonary infection were collected and analyzed in the two groups one month after the catheterization. Results: After follow-up for one month, compared with NGT group, patients in PEG group had a lower incidence of pulmonary infection (23.3% vs 37.8%, P =0.023), a later occurrence of pulmonary infection (average time: 21 days vs 13 days, P =0.034), and a less severe pulmonary infection (7.0% vs 12.9%, P =0.029). The following characteristics made patients more susceptible to pulmonary infection: age ≥ 70 years ( HR =1.619, 95% CI 1.054-2.172), Charlson comorbidity index ≥ 2 points ( HR =1.647, 95% CI 1.043-2.485), using of proton pump inhibitor ≥ 7 days ( HR =1.725, 95% CI 1.214-2.738), and number of pressure ulcers ≥ 3 ( HR =2.109, 95% CI 1.128-3.844). However, serum albumin concentration ≥35 g/L ( HR =0.670, 95% CI 0.375-0.963) was a protective factor for pulmonary infections. The number of consistent pathogens cultivated from saliva, gastric juice and sputum simultaneously in NGT and PEG group was 35 strains (27.8%) and 8 strains (13.3%), respectively ( P =0.029). The mortality of pulmonary infection was similar in the two groups (3.5% vs 4.3%, P =1.000), but the death due to pulmonary infection in the PEG group occur later (median time: 20 days vs 11 days, P =0.012). Conclusions: PEG feeding was a preferred nutrition way which could reduce the risk of pulmonary infection more effectively than NGT feeding which might favored a retrograde gastro-pulmonary route by which pathogens colonized in stomach migrated to respiratory tract. Patients with characteristics mentioned above had the susceptibility of pulmonary infection, thus risk assessment of pulmonary infection should be conducted before selecting the catheterization method.