目的:探讨桡动脉远端穿刺在经皮冠状动脉介入(PCI)治疗中的整体应用效果及安全性。方法:选取2019年6月-2020年9月在深圳市人民医院龙华分院行PCI治疗的164例患者为研究对象,按照随机数字表法分为对照组(n=82)和观察组(n=82)。对照组行...目的:探讨桡动脉远端穿刺在经皮冠状动脉介入(PCI)治疗中的整体应用效果及安全性。方法:选取2019年6月-2020年9月在深圳市人民医院龙华分院行PCI治疗的164例患者为研究对象,按照随机数字表法分为对照组(n=82)和观察组(n=82)。对照组行常规桡动脉穿刺PCI手术,观察组行桡动脉远端穿刺PCI手术。比较两组一次性穿刺成功率、手术成功率、穿刺时间、手术时间、压迫止血时间、住院时间及手术并发症发生率。结果:两组一次性穿刺成功率(98.8% vs 96.3%)和手术成功率(100% vs 97.6%)比较差异均无统计学意义(χ^(2)=1.025、2.025,P>0.05)。观察组穿刺时间[(6.65±2.01)min]长于对照组的(5.17±1.73)min,压迫止血时间[(6.13±0.54)h]短于对照组的(6.48±0.57)h,差异有统计学意义(t=-8.794、3.068,P<0.05)。观察组桡动脉闭塞、手臂肿胀发生率分别为0、0,低于对照组的4.9%、6.1%,差异均有统计学意义(χ^(2)=4.100、5.157,P<0.05)。结论:桡动脉远端穿刺在PCI治疗中的应用效果良好,且可有效降低手术并发症的发生率,安全性更高。展开更多
Under the absolute coordinate system, the unsteady Reynolds averaged Navier-Stokes(URANS)equations and the k-ω SST turbulence model are solved using the finite volume method to simulate the aerodynamic characteristic...Under the absolute coordinate system, the unsteady Reynolds averaged Navier-Stokes(URANS)equations and the k-ω SST turbulence model are solved using the finite volume method to simulate the aerodynamic characteristics of large seaplane flying with the ground-effect above wavy surface. The velocity inlet wave-making method and the volume of fluid model are used to accurately simulate the linear regular waves and to precisely capture the free surface. This paper studies the influence of the sideslip angle on the aerodynamic characteristics of large seaplane when it is cruising above wavy water. The results show that the wave surface mainly affects the pressure distribution on the lower surface of the wing. When the sideslip angle varies from 0° to 8°,the varying of frequency of aerodynamic forces is consistent with the wave encounter frequency,and both periods are 0.6 s. With the increase of the sideslip angle,the lift coefficient and the pitching moment coefficient decrease. However,when the sideslip angle is smaller than 4°,the decrease amplitude is small,and the significant decrease occurs above 4° and during the whole process of the change of sideslip angle,the aerodynamic fluctuation amplitude is almost unchanged. As the drag coefficient increases with the increase of sideslip angle,significant increase also occurs when the value is greater than4°,and the fluctuation amplitude does not show any correlations. The rolling moment coefficient and yaw moment coefficient increase with the increase of the sideslip angle,and the fluctuation amplitudes of both increase linearly with the increase of the sideslip angle.展开更多
文摘目的:探讨桡动脉远端穿刺在经皮冠状动脉介入(PCI)治疗中的整体应用效果及安全性。方法:选取2019年6月-2020年9月在深圳市人民医院龙华分院行PCI治疗的164例患者为研究对象,按照随机数字表法分为对照组(n=82)和观察组(n=82)。对照组行常规桡动脉穿刺PCI手术,观察组行桡动脉远端穿刺PCI手术。比较两组一次性穿刺成功率、手术成功率、穿刺时间、手术时间、压迫止血时间、住院时间及手术并发症发生率。结果:两组一次性穿刺成功率(98.8% vs 96.3%)和手术成功率(100% vs 97.6%)比较差异均无统计学意义(χ^(2)=1.025、2.025,P>0.05)。观察组穿刺时间[(6.65±2.01)min]长于对照组的(5.17±1.73)min,压迫止血时间[(6.13±0.54)h]短于对照组的(6.48±0.57)h,差异有统计学意义(t=-8.794、3.068,P<0.05)。观察组桡动脉闭塞、手臂肿胀发生率分别为0、0,低于对照组的4.9%、6.1%,差异均有统计学意义(χ^(2)=4.100、5.157,P<0.05)。结论:桡动脉远端穿刺在PCI治疗中的应用效果良好,且可有效降低手术并发症的发生率,安全性更高。
文摘Under the absolute coordinate system, the unsteady Reynolds averaged Navier-Stokes(URANS)equations and the k-ω SST turbulence model are solved using the finite volume method to simulate the aerodynamic characteristics of large seaplane flying with the ground-effect above wavy surface. The velocity inlet wave-making method and the volume of fluid model are used to accurately simulate the linear regular waves and to precisely capture the free surface. This paper studies the influence of the sideslip angle on the aerodynamic characteristics of large seaplane when it is cruising above wavy water. The results show that the wave surface mainly affects the pressure distribution on the lower surface of the wing. When the sideslip angle varies from 0° to 8°,the varying of frequency of aerodynamic forces is consistent with the wave encounter frequency,and both periods are 0.6 s. With the increase of the sideslip angle,the lift coefficient and the pitching moment coefficient decrease. However,when the sideslip angle is smaller than 4°,the decrease amplitude is small,and the significant decrease occurs above 4° and during the whole process of the change of sideslip angle,the aerodynamic fluctuation amplitude is almost unchanged. As the drag coefficient increases with the increase of sideslip angle,significant increase also occurs when the value is greater than4°,and the fluctuation amplitude does not show any correlations. The rolling moment coefficient and yaw moment coefficient increase with the increase of the sideslip angle,and the fluctuation amplitudes of both increase linearly with the increase of the sideslip angle.
