Dysbiosis of Gut Microbiota Is an Independent Risk Factor of Stroke-Associated Pneumonia: A Chinese Pilot StudyOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
This prospective observational study evaluated whether gut microbiome composition is associated with stroke-associated pneumonia (SAP) in patients with acute ischemic stroke. Researchers collected fecal and serum samples at admission and used 16S rRNA V4 tag sequencing, analyzed with QIIME and LEfSe, to characterize gut microbiota. They also measured fecal short-chain fatty acids and serum markers of gut barrier integrity, including D-lactate, intestinal fatty acid-binding protein, and lipopolysaccharide binding protein.
Who was studied?
The training cohort included 188 patients with acute ischemic stroke, of whom 52 (27.7%) developed stroke-associated pneumonia. Findings were validated in an independent cohort of 144 patients, 28 of whom (19.4%) developed SAP. Disease severity scores were recorded by specialized physicians alongside the microbiome and biomarker data.
What were the most important findings?
Gut microbiome composition differed significantly between patients who developed SAP and those who did not. Patients with SAP showed depletion of Roseburia along with enrichment of opportunistic pathogens, a pattern confirmed in the independent validation cohort. Multivariate analysis identified Roseburia as a protective factor against SAP in both the training and validation cohorts, supporting gut dysbiosis as an independent risk factor for this complication.
What are the greatest implications of this study?
These findings suggest gut microbiota, particularly Roseburia abundance, could serve as an early biomarker to identify stroke patients at higher risk of pneumonia. Because Roseburia acted as a protective factor across two independent cohorts, restoring or supporting this taxon may represent a potential avenue for reducing SAP risk. The results also point toward gut-lung axis mechanisms as a relevant target for future preventive strategies in acute ischemic stroke care.