Irritable bowel syndrome (IBS) is a functional gastrointestinal disorder that is characterized by abdominal pain and disordered bowel habits. The etiology of IBS is multifactorial, including abnormal gut-brain interactions, visceral hypersensitivity, altered colon motility, and psychological factors. Recent studies have shown that the intestinal microbiota and its metabolites short chain fatty acids (SCFAs) may be involved in the pathogenesis of IBS. SCFAs play an important role in the pathophysiology of IBS. We discuss the underlying mechanisms of action of SCFAs in intestinal inflammation and immunity, intestinal barrier integrity, motility, and the microbiota-gutbrain axis. Limited to previous studies, further studies are required to investigate the mechanisms of action of SCFAs in IBS and provide more precise therapeutic strategies for IBS.

To explore the ablation effect of porcine thyroid in vivo ablated with 3 W/1800 J ND:YAG laser,ultrasound examination and contrast-ultrasound were done to observe scope of ablation lesion. The experimental results showed that the ablation effect of porcine thyroid in vivo ablated with 3 W/1800 J ND:YAG laser is definite, and ideal ablation lesion can be formed.