Objective:To study the characteristics of hearing loss caused by local microcirculatory disorders in the cochlea basal turn near termination of guinea pigs.Method:The local microcirculatory disorders in the cochlea basal turn near termination of guinea pigs were caused by photochemical reaction;morphological changes were observed by light microscope;the CAP N1 amplitude,CAP N1 latency and CAP N1 threshold shift which were evoked by short tone burst were recorded by Madsen 2250.Result:Morphological changes showed that histopathological changes were located in the basal turn near termination of cochlea.The CAP N1 amplitude,CAP N1 latency and CAP N1 threshold shift showed that the hearing loss was remarkable in the high-range frequencies.Conclusion:If the local microcirculatory disorders in the cochlea basal turn near termination take place,the hearing losses are more remarkable in the high-range frequencies.

Objective　To study the characteristics of hearing loss caused by local microcirculatory disorders in the cochlea of guinea pigs. Methods　The local microcirculatory disorders in the cochlea basal turn near terminal or in the cupule of cochlea of guinea pigs were induced by photochemical reaction. The morphological changes in the cochlea were observed with light microscopy. The compound action potential N1 (CAPN1) amplitude, latency, threshold shift evoked by short tone burst were recorded by Madsen 2250 system. Results　When the local microcirculatory disorders took place in the cochlea basal turn near terminal, the hearing losses were more remarkable in the high-range frequencies, but with low-range ones to some extent. If the local microcirculatory disorders was induced in the cochlea cupule, the hearing losses were mainly in the low-range frequencies companying with some high-frequency ones. Conclusion　Local microcirculatory disorders in the different parts of the cochlea cause different types of hearing loss in different frequency.

Objective　To study the cochlea microvasculature permeability changes of the inner ear in guinea pigs, so as to clarify the possible role of the cochlea microvasculature permeability changes in the ischemic injury of inner ears. Methods　Modified method of Evans blue fluorescence was used to observe the changes of permeability of the cochlea microvasculature in the animal model of cochlea microcirculatory disorders which was caused by photochemical reaction. CAPN1 threshold was recorded by using Madsen 2 250 to study the hearing loss. Results　The amounts of Evens blue crossing the cochlea microvasculature were (1.709±0.769) and (2.849 ±0.653) μg/per animal 2 and 4 h after the development of cochlea microcirculatory disorder in guinea pigs, respectively (P<0.01); and their hearing loss were （24.44 ±7.27） and （38.33±7.91）dBpeSPL in 2 and 4 h, respectively (P<0.01)． Conclusion　The permeability of the cochlea microvasculature increases along with the duration of cochlea microcirculatory disorder occur and the increase of cochlea microvasculature permeability might be one of the important mechanisms inducing cochlear ischemic lesions.

Objective To investigate the clinical efficacy of Zhuang medical sinew therapy forcervical spondylotic radiculopathy and provide reliable experimental data and scientific evidence for the establishment of clinical technical operation standardization.Method Eighty patients with cervical spondylotic radiculopathy were randomly allocated to treatment and control groups, 40 cases each.The control group took Jingfukang granules with hot water and the treatment group received Zhuang medical sinew therapy.The therapeutic effects were compared after one course of treatment.The 20-point scale score and the VAS score were recorded in the patients before and after treatment.Result Thirty-eight patients in the treatment group and 36 patients in the control group completed the required treatments. The total efficacy rate was 92.1% in the treatment group and 72.2% in the control group;there was a statistically significant difference between the twogroups(P<0.05).There were statistically significant post-treatment differences in the Japanese 20-point scale score and the VAS score between the two groups (P<0.05).Theresults showed that the Japanese 20-point scale score and the VAS score improved more in thetreatment group.Conclusion Zhuang medical sinewtherapy has a marked effect oncervical spondylotic radiculopathy.

Objective To study the characteristics of hearing loss caused by local microcirculatory disorders in the cochlea apical part of guinea pigs. Methods The local microcirculatory disorders in the cochlea apical part of guinea pigs were caused by photochemical reaction. Morphological changes were observed by light microscope. The CAP - N1 amplitude, CAP - N1 latency, CAP - N1 threshold shift and CM amplitude which were evoked by short tone burst were recorded by Madsen 2250. Re- sults Histopathological changes showed that microthrombosis in the capillaries of stria vascularies and spiral ligment were located in the apical and third turn of cochlea. The CAP - N1 amplitude, CAP - N1 latency, CAP-N1 threshold shift and CM amplitude showed that the hearing loss was remarkable in the low - range frequencies. Conclusion When the local microcirculatory disor- ders in the cochlear apical part took place, the hearing loss was more marked in the low - range frequencies.

Objective To observe the effect of ACh on outwardly rectifying potassium currents in isolated outer hair cells(OHCs) with variant length and to analyze effects of ACII on kinetics of the currents. Methods The whole cell patch-clamp technique was used. Results 100 ?mol/L ACh induced greater effects on outwardly rectifying potassium currents in short OHCs. The maximal amplitude of the outward currents increased by 34.8% in the presence of 100 ?mol/L ACII when conditioning potential was 50 mV. ACh effects on the peak currents were greater when compared to the effects on the steady-state currents and changed the shapes of the currents. ACII caused a hyperpolarizing shift of zero current potential of 5 mV. Kinetics of the currents were changed by 100 ?mol/L ACh which induced significantly more hyperpolarizing than control, with increased potential sensitivity of activation, V1/2(Ach) =(-52.38 ? 3.98) mV, SACh =(40 ? 4.14) mV(n= 5). Conclusion ACh increased the conductance of outwardly rectifying K + channel in a voltage dependent manner and caused a hyperpolarizing shift of activation potential. Effect of ACh was to hyperpolarize the membrane potential of OHCs from rest.

Objective To evaluate the technique of electron microscopic autoradiography in inner ear pathology.Methods The thin sections that was labeled with the thymidine-H3(3H-TdR)were prepared.The labeled specimen were processed for electron microscopic autoradiography(EM-ARG)after treatment with emulsions,development and fixation.Results Incorporation of 3H-TdR was seen over regenerated cells in the experimental papilla in regions of hair cell loss.Conclusion This methocl gives a good localization of the label at the ultrastructural level.

Objective To investigate the anatomical and histological features of the rat endolymphatic sac. Methods The temporal bones of the healthy,adult SD rats were removed.The morphology of the endolymphatic sac were studied.Then the decalcified samples were embeded in paraffin.The sections of the endolymphatic sac were stained with HE method and observed histologically,and then examined immunohistochemically by monoclonal antibodies against IgG,CD 3 of the rat to investigate the immunocompetent cells in endolymphatic sac of the rats. Results Simple cuboidal and squamous epithelium were the main types of the epithelium in rat endolymphatic sac CD + 3,IgG + immunoreactive lymphocytes were found mainly in the epithelium of the endolymphatic sac.Conclusion\ The morphology of the rat endolymphatic sac is similar to those of human and guinea pig endolymphatic sacs.Some immunocompetent cells were found in the endolymphatic sac,suggesting that the endolymphatic sac plays an important role in immune of inner ear.\;[

By establishing experimental modal of laryngeal allograft,the short-term histopathological changes of liver and kidney in Cyclosporine A (CsA)-treated rats receiving laryn- geal allograft were observed.The animals were divided into 3 groups.Group 1 was given CsA 15 mg?kg~(-1)/d by daily intraperitoneal injection for 2 weeks,Group 2 received CsA 25 mg?kg~(-1)/d, and the third group without CsA treatment served as control.All of recipients were sacrificed 14 days after transplantation.Histological examination showed that CsA nephrotoxicity was charac- terized by abundant vacuolation of the proximal tubular epithelium cells,hyaline regeneration of arterioles with thickening of vascular wall,and striped interstitial fibrosis and its hepatotoxicity by fatty degeneration with mild hyperplasia of Kupffer's cells and focal necrosis of hepatocytes. Histopathological changes of CsA-induced hepato- and nephrotoxicity of the recipients were closely correlated to the dosage of CsA received.

Objective To investigate whether apoptosis is invovled in the immune response of inner ear,and relation between the signal transduction of Caspase-3 and apoptosis. Methods Sixteen healthy,female guinea pigs were employed in this study. The animals in the experiment group were sensitized systematically with keyhole limpet hemocyanin(KLH),then were inoculated in inner ear with the same antigen, and the animals in the control group were injected with the same volume of PBS. The animals were sacrificed at the 5th day after inner ear vaccination. Paraffin sections of cochleas from animals were prepared, TUNEL assay was used to detect apoptotic cells in inner ears, and immunohistochemical method was applied to detect the expression of Caspase-3 in inner ears. Results TUNEL-positive cells are found in the inner ears of the experiment group, but did not in the inner ears of the control group except for a few TUNEL-positive cells in the supporting cells, the stria vascular cells and the spiral ganglion cells. The high expression of Caspase-3 could be detected in the inner ears of the experiment group, but no positive cells of Caspase-3 were found in the inner ears of the control group. Conclusion Apoptosis could be induced by the immune response of inner ear, and Caspase-3 cascade may be involved in the course of apoptosis.