AIM:To investigate the changes in corneal biomechanics and posterior corneal surface elevation after femtosecond laser-assisted in situ keratomileusis(FS-LASIK).METHODS:Totally 197 eyes of 100 patients who underwent t...AIM:To investigate the changes in corneal biomechanics and posterior corneal surface elevation after femtosecond laser-assisted in situ keratomileusis(FS-LASIK).METHODS:Totally 197 eyes of 100 patients who underwent the FS-LASIK from April 2022 to November 2022 were included.They were divided into three groups according to the ratio of residual corneal stroma thickness/corneal thickness(RCST/CT):Group I(50%≤RCST/CT<55%,63 eyes of 32 patients),Group II(55%≤RCST/CT<60%,67 eyes of 34 patients),and Group III(RCST/CT≥60%,67 eyes of 34 patients).The intraocular pressure(IOP),corneal compensated IOP(IOPcc),corneal hysteresis(CH)and corneal resistance factor(CRF)were measured immediately,1,and 3mo postoperatively by ocular response analyzer(ORA)and the posterior elevation difference(PED)was measured by Pentacam.RESULTS:After operation,IOP,CH,CRF,and PED were statistically different among the three groups(F=12.99,31.148,23.998,all P<0.0001).There was no statistically significant difference in IOPcc among the three groups(F=0.603,P>0.05).The IOP,IOPcc,CH,and CRF were statistical changed after surgery(F=699.635,104.125,308.474,640.145,all P<0.0001).The PED of Group I was significantly higher than that of Group II(P<0.05),and Group II was significantly higher than that of Group III(P<0.05).The PED value of 3mo after surgery decreased in each group compared with 1mo after surgery,but there was no statistical difference(Group I:t=0.82,P=0.41;Group II:t=0.17,P=0.87;Group III:t=1.35,P=0.18).The correlation analysis of corneal biomechanical parameter changes with PED at 1mo and 3mo after surgery showed thatΔIOP,ΔIOPcc,ΔCH,andΔCRF were not correlated with PED value in three groups(P>0.05).CONCLUSION:The smaller the RCST/CT,the greater effect on corneal biomechanics and posterior surface elevation.There is no correlation between changes in corneal biomechanics and posterior corneal surface elevation in the range of RCST/CT≥50%.展开更多
Background: To explore the changes in ocular biomechanics during pregnancy and the postpartum period and their association with maternal hormone level changes. Methods: In a prospective cohort study, 24 eyes of 12 pre...Background: To explore the changes in ocular biomechanics during pregnancy and the postpartum period and their association with maternal hormone level changes. Methods: In a prospective cohort study, 24 eyes of 12 pregnant women were enrolled and monitored throughout pregnancy and after delivery (6 weeks). Intraocular pressure (IOP), central corneal thickness (CCT), corneal endothelium cell (CEC), axial length (AL), corneal curvature (K1, K2), anterior chamber depth (ACD), central subfield thickness (CST), macular volume (MV), cube average thickness (CAT), retinal nerve fibre layer (RNFL), tear meniscus height (TMH), and breaking up time (BUT) were measured throughout pregnancy, and blood plasma levels of maternal hormones were determined at the same time points. Results: A gradual decrease in IOP values was observed as gestation progressed, and there was a statistically significant difference in IOP between the 3rd trimester and the 1st and 2nd trimester and postpartum (p = 0.002, p = 0.006, p = 0.050). There was a significant difference between the 1st and 2nd trimesters in terms of MV (p = 0.023). The difference in RNFL in the 3rd trimester and postpartum was significant (p = 0.011). The levels of the β-hCG showed a significant correlation with K2, ACD, and TMH only in the 2nd trimester (r = 0.588, p = 0.045;r = - 0.740, p = 0.006;r = 0.642, p = 0.024). Regarding luteinizing hormone, there was a negative correlation with MV in the 1st and 2nd trimesters (r = - 0.598, p = 0.040;r = - 0.672, p = 0.017) and CAT in the 1st and 2nd trimesters (r = - 0.599, p = 0.040;r = - 0.655, p = 0.021). Luteinizing hormone levels were correlated with ACD (r = - 0.702, p = 0.011) in the 2nd trimester and K2 (r = 0.585, p = 0.046) in the 3rd trimester. A correlation was found between follicle-stimulating hormone levels and CEC, MV and CAT in the 1st trimester (r = - 0.677, p = 0.016;r = - 0.602, p = 0.039;r = - 0.584, p = 0.046) and AL in the 3rd trimester (r = - 0.618, p = 0.032). The correlation between oestradiol and CST in the 1st trimester (r = - 0.621, p = 0.031) and RNFL (r = 0.594, p = 0.041) in the postpartum. A statistically significant correlation between progesterone and MV (r = 0.583, p = 0.047) and TMH (r = 0.762, p = 0.004) was observed in the 1st trimester. No significant intergroup correlation was observed postpartum (p > 0.05). Conclusion: Ophthalmological parameters showed physiological changes induced by hormone levels in pregnancy and returned to baseline levels after delivery.展开更多
In clinical practice,cervical spine surgery inevitably alters the original physiological structure of the cervical spine,thus causing changes in the original biomechanical properties of the cervical spine.The biomecha...In clinical practice,cervical spine surgery inevitably alters the original physiological structure of the cervical spine,thus causing changes in the original biomechanical properties of the cervical spine.The biomechanical properties of the cervical spine are particularly significant as it is an essential structure that supports the head and connects the trunk.Different cervical spine surgery options can have different effects on the biomechanics of the cervical spine.Therefore,this review will discuss recent research advances on the effects of cervical spine surgery on cervical spine biomechanics.We hope that this review will provide some theoretical basis for future studies on the biomechanical effects of cervical spine surgery on the cervical spine.展开更多
目的 应用高分辨率固态测压技术(HRM)检测Passy-Muir说话瓣膜(PMV)对脑卒中气管切开患者吞咽生物力学的作用,探讨利用咽腔与食管上括约肌(UES)压力参数评估PMV治疗效果的应用价值。方法 2020年1月至2024年1月,新疆维吾尔自治区人民医院...目的 应用高分辨率固态测压技术(HRM)检测Passy-Muir说话瓣膜(PMV)对脑卒中气管切开患者吞咽生物力学的作用,探讨利用咽腔与食管上括约肌(UES)压力参数评估PMV治疗效果的应用价值。方法 2020年1月至2024年1月,新疆维吾尔自治区人民医院100例脑卒中气管切开患者随机分为对照组(n=50)和PMV组(n=50),对照组给予常规吞咽康复,PMV组在此基础上佩戴PMV,共2周。治疗前后,采用改良曼恩吞咽能力评估量表(MMASA)进行临床吞咽功能评估;并进行HRM检查,收集腭咽收缩压力峰值、腭咽收缩时长、UES松弛残余压和UES松弛时间等数据。将PMV组治疗后的MMASA评分与HRM压力参数值进行相关性分析。结果 两组各脱落4例。治疗后,两组UES松弛残余压显著降低(t> 47.403, P <0.001),MMASA评分、腭咽收缩压力峰值、腭咽收缩时长和UES松弛时间均显著增加(t> 19.621, P <0.001);PMV组均优于对照组(t>2.050, P <0.05)。治疗后PMV组腭咽收缩压力峰值(r=0.924, P <0.001)、腭咽收缩时长(r=0.948, P <0.001)和UES松弛残余时间(r=0.954, P <0.001)与MMASA评分呈正相关,UES松弛残余压与MMASA评分呈负相关(r=-0.939, P <0.001)。结论 佩戴PMV治疗能增强脑卒中气管切开患者的吞咽功能,提高咽腔和UES区域的吞咽生物力学水平。利用咽腔和UES区域的压力参数可预测佩戴PMV治疗后患者吞咽功能的改善情况。展开更多
文摘AIM:To investigate the changes in corneal biomechanics and posterior corneal surface elevation after femtosecond laser-assisted in situ keratomileusis(FS-LASIK).METHODS:Totally 197 eyes of 100 patients who underwent the FS-LASIK from April 2022 to November 2022 were included.They were divided into three groups according to the ratio of residual corneal stroma thickness/corneal thickness(RCST/CT):Group I(50%≤RCST/CT<55%,63 eyes of 32 patients),Group II(55%≤RCST/CT<60%,67 eyes of 34 patients),and Group III(RCST/CT≥60%,67 eyes of 34 patients).The intraocular pressure(IOP),corneal compensated IOP(IOPcc),corneal hysteresis(CH)and corneal resistance factor(CRF)were measured immediately,1,and 3mo postoperatively by ocular response analyzer(ORA)and the posterior elevation difference(PED)was measured by Pentacam.RESULTS:After operation,IOP,CH,CRF,and PED were statistically different among the three groups(F=12.99,31.148,23.998,all P<0.0001).There was no statistically significant difference in IOPcc among the three groups(F=0.603,P>0.05).The IOP,IOPcc,CH,and CRF were statistical changed after surgery(F=699.635,104.125,308.474,640.145,all P<0.0001).The PED of Group I was significantly higher than that of Group II(P<0.05),and Group II was significantly higher than that of Group III(P<0.05).The PED value of 3mo after surgery decreased in each group compared with 1mo after surgery,but there was no statistical difference(Group I:t=0.82,P=0.41;Group II:t=0.17,P=0.87;Group III:t=1.35,P=0.18).The correlation analysis of corneal biomechanical parameter changes with PED at 1mo and 3mo after surgery showed thatΔIOP,ΔIOPcc,ΔCH,andΔCRF were not correlated with PED value in three groups(P>0.05).CONCLUSION:The smaller the RCST/CT,the greater effect on corneal biomechanics and posterior surface elevation.There is no correlation between changes in corneal biomechanics and posterior corneal surface elevation in the range of RCST/CT≥50%.
文摘Background: To explore the changes in ocular biomechanics during pregnancy and the postpartum period and their association with maternal hormone level changes. Methods: In a prospective cohort study, 24 eyes of 12 pregnant women were enrolled and monitored throughout pregnancy and after delivery (6 weeks). Intraocular pressure (IOP), central corneal thickness (CCT), corneal endothelium cell (CEC), axial length (AL), corneal curvature (K1, K2), anterior chamber depth (ACD), central subfield thickness (CST), macular volume (MV), cube average thickness (CAT), retinal nerve fibre layer (RNFL), tear meniscus height (TMH), and breaking up time (BUT) were measured throughout pregnancy, and blood plasma levels of maternal hormones were determined at the same time points. Results: A gradual decrease in IOP values was observed as gestation progressed, and there was a statistically significant difference in IOP between the 3rd trimester and the 1st and 2nd trimester and postpartum (p = 0.002, p = 0.006, p = 0.050). There was a significant difference between the 1st and 2nd trimesters in terms of MV (p = 0.023). The difference in RNFL in the 3rd trimester and postpartum was significant (p = 0.011). The levels of the β-hCG showed a significant correlation with K2, ACD, and TMH only in the 2nd trimester (r = 0.588, p = 0.045;r = - 0.740, p = 0.006;r = 0.642, p = 0.024). Regarding luteinizing hormone, there was a negative correlation with MV in the 1st and 2nd trimesters (r = - 0.598, p = 0.040;r = - 0.672, p = 0.017) and CAT in the 1st and 2nd trimesters (r = - 0.599, p = 0.040;r = - 0.655, p = 0.021). Luteinizing hormone levels were correlated with ACD (r = - 0.702, p = 0.011) in the 2nd trimester and K2 (r = 0.585, p = 0.046) in the 3rd trimester. A correlation was found between follicle-stimulating hormone levels and CEC, MV and CAT in the 1st trimester (r = - 0.677, p = 0.016;r = - 0.602, p = 0.039;r = - 0.584, p = 0.046) and AL in the 3rd trimester (r = - 0.618, p = 0.032). The correlation between oestradiol and CST in the 1st trimester (r = - 0.621, p = 0.031) and RNFL (r = 0.594, p = 0.041) in the postpartum. A statistically significant correlation between progesterone and MV (r = 0.583, p = 0.047) and TMH (r = 0.762, p = 0.004) was observed in the 1st trimester. No significant intergroup correlation was observed postpartum (p > 0.05). Conclusion: Ophthalmological parameters showed physiological changes induced by hormone levels in pregnancy and returned to baseline levels after delivery.
文摘In clinical practice,cervical spine surgery inevitably alters the original physiological structure of the cervical spine,thus causing changes in the original biomechanical properties of the cervical spine.The biomechanical properties of the cervical spine are particularly significant as it is an essential structure that supports the head and connects the trunk.Different cervical spine surgery options can have different effects on the biomechanics of the cervical spine.Therefore,this review will discuss recent research advances on the effects of cervical spine surgery on cervical spine biomechanics.We hope that this review will provide some theoretical basis for future studies on the biomechanical effects of cervical spine surgery on the cervical spine.
文摘目的 应用高分辨率固态测压技术(HRM)检测Passy-Muir说话瓣膜(PMV)对脑卒中气管切开患者吞咽生物力学的作用,探讨利用咽腔与食管上括约肌(UES)压力参数评估PMV治疗效果的应用价值。方法 2020年1月至2024年1月,新疆维吾尔自治区人民医院100例脑卒中气管切开患者随机分为对照组(n=50)和PMV组(n=50),对照组给予常规吞咽康复,PMV组在此基础上佩戴PMV,共2周。治疗前后,采用改良曼恩吞咽能力评估量表(MMASA)进行临床吞咽功能评估;并进行HRM检查,收集腭咽收缩压力峰值、腭咽收缩时长、UES松弛残余压和UES松弛时间等数据。将PMV组治疗后的MMASA评分与HRM压力参数值进行相关性分析。结果 两组各脱落4例。治疗后,两组UES松弛残余压显著降低(t> 47.403, P <0.001),MMASA评分、腭咽收缩压力峰值、腭咽收缩时长和UES松弛时间均显著增加(t> 19.621, P <0.001);PMV组均优于对照组(t>2.050, P <0.05)。治疗后PMV组腭咽收缩压力峰值(r=0.924, P <0.001)、腭咽收缩时长(r=0.948, P <0.001)和UES松弛残余时间(r=0.954, P <0.001)与MMASA评分呈正相关,UES松弛残余压与MMASA评分呈负相关(r=-0.939, P <0.001)。结论 佩戴PMV治疗能增强脑卒中气管切开患者的吞咽功能,提高咽腔和UES区域的吞咽生物力学水平。利用咽腔和UES区域的压力参数可预测佩戴PMV治疗后患者吞咽功能的改善情况。
