Objective To investigate the diagnostic value of combining video nystagmography and video head impulse test(vHIT)in determining the nature of acute vestibular syndrome(A VS).Methods A total of 387 patients with AVS were enrolled and divided into central group(central vas-cular,n=181)and peripheral group(vestibular peripheral,n=206).Patients underwent examina-tions using VOG and vHIT,and parameters were recorded.Results In video nystagmography re-sults,the proportion of patients with type Ⅲ curve in stable tracking test and recoil in saccade test in the central group was significantly higher,while the proportion of patients with unilateral weakening of nystagmus gain in positional nystagmus test and swivel chair rotation-scram test was significantly lower than that in the peripheral group(P＜0.05).The proportion of vHIT abnormity in the central group was significantly lower,and the low-frequency level vestibular ocular reflex(VOR)gain values was significantly higher than that in the peripheral group(P＜0.05).Multivariate logistic regression re-vealed that type Ⅲ curves(OR=1.859,95％CI,1.235 to 3.032,P＜0.001)and low-frequency level VOR gain values(OR=1.524,95％CI,1.102 to 2.231,P＜0.001)were associated with central vascular AVS,whereas abnormal vHIT(OR=0.523,95％CI,0.321 to 0.899,P＜0.001)was associated with vestibular peripheral AVS.Receiver operating characteristic(ROC)curve analy-sis indicated that the area under the curve(AUC)for diagnosing central vascular versus vestibular peripheral AVS using type Ⅲ curves,low-frequency level VOR gain values and abnormal vHIT was 0.903(95％CI,0.812 to 0.956,P＜0.001).Conclusion Combining video nystagmography with vHIT is an important tool for rapid and accurate differentiation of the etiology of AVS.

To study the effect of miR-340-5p on the proliferation of laryngeal cancer Hep2 cells and explore its intrinsic molecular mechanism, so as to screen potential biomarkers and targets for the diagnosis and treatment of laryngeal cancer. The expression of miR-340-5p in laryngeal cancer tissues, paracancerous tissues, laryngeal cancer cell lines Hep2 and normal bronchial HBE cell lines was quantitatively analyzed by qRT-PCR; The double luciferase reporter vector was constructed to verify whether STAT3 was a potential target gene of microRNA-340-5p; The miR-340-5p mimics/inhibitor was transfected into Hep2 cells by liposome and verified by qRT-PCR; The CCK-8 method and Annexin V/PI method were used to analyze the proliferation and apoptosis of transfected cells; and Western Blot was used to detect the expression of STAT3 and Wnt/β-catenin pathway-related proteins after transfection. The results of qRT-PCR showed that the level of miR-340-5p in laryngeal cancer tissues and Hep2 cells was significantly lower than that in adjacent tissues and HBE cells, and the expression of miR-340-5p was significantly increased or decreased after overexpression or inhibition; Luciferase activity showed that miR-340-5p directly interacted with target gene STAT3 3'-UTR and negatively regulated its expression; Cell proliferation and apoptosis analysis showed that up-regulation of microRNA-340-5p could significantly inhibit the proliferation and induce apoptosis of Hep2 cells in vitro, and vice versa; Western Blot results showed that the levels of STAT3 and β-catenin, c-Myc, TCF-4, CyclinD1 and ROCK1 in Hep2 cells were significantly lower than those in the control group after over-expression of miR-340-5p, and vice versa. The expression of miR-340-5p is abnormally low in laryngeal cancer tissues and Hep2 cells. It can be used as a potential biological target for diagnosis and treatment of laryngeal cancer by targeting STAT3 gene to negatively regulate Wnt/β-catenin signaling pathway.

Objective: To study the effect of miR-340-5p on the proliferation of laryngeal cancer Hep2 cells and explore its intrinsic molecular mechanism, so as to screen potential biomarkers and targets for the diagnosis and treatment of laryngeal cancer. Method: The expression of miR-340-5p in laryngeal cancer tissues, paracancerous tissues, laryngeal cancer cell lines Hep2 and normal bronchial HBE cell lines was quantitatively analyzed by qRT-PCR; The double luciferase reporter vector was constructed to verify whether STAT3 was a potential target gene of microRNA-340-5p; The miR-340-5p mimics/inhibitor was transfected into Hep2 cells by liposome and verified by qRT-PCR; The CCK-8 method and Annexin V/PI method were used to analyze the proliferation and apoptosis of transfected cells; and Western Blot was used to detect the expression of STAT3 and Wnt/β-catenin pathway-related proteins after transfection. Result: The results of qRT-PCR showed that the level of miR-340-5p in laryngeal cancer tissues and Hep2 cells was significantly lower than that in adjacent tissues and HBE cells, and the expression of miR-340-5p was significantly increased or decreased after overexpression or inhibition; Luciferase activity showed that miR-340-5p directly interacted with target gene STAT3 3'-UTR and negatively regulated its expression; Cell proliferation and apoptosis analysis showed that up-regulation of microRNA-340-5p could significantly inhibit the proliferation and induce apoptosis of Hep2 cells in vitro, and vice versa; Western Blot results showed that the levels of STAT3 and β-catenin, c-Myc, TCF-4, CyclinD1 and ROCK1 in Hep2 cells were significantly lower than those in the control group after over-expression of miR-340-5p, and vice versa. Conclusion The expression of miR-340-5p is abnormally low in laryngeal cancer tissues and Hep2 cells. It can be used as a potential biological target for diagnosis and treatment of laryngeal cancer by targeting STAT3 gene to negatively regulate Wnt/β-catenin signaling pathway.