目的探讨低压回流冲洗在输尿管镜钬激光碎石术中对结石残留和热损伤的影响。方法将152例输尿管中、上段结石患者分成观察组和对照组,每组76例。2组均使用钬激光碎石术。对照组行常规输尿管镜钬激光碎石术。观察组先将4F导管置至结石上方...目的探讨低压回流冲洗在输尿管镜钬激光碎石术中对结石残留和热损伤的影响。方法将152例输尿管中、上段结石患者分成观察组和对照组,每组76例。2组均使用钬激光碎石术。对照组行常规输尿管镜钬激光碎石术。观察组先将4F导管置至结石上方,导管置于镜外,二次进镜至结石部位,采取吊袋法(高度为95 cm H_(2)O)持续冲洗钬激光碎石术。观察2组手术时间、结石清除率和残留率、术后发热和输尿管狭窄发生率。结果观察组平均手术时间30 min,结石清石率97.4%,结石残留2例(2.63%),术后发热2例(2.63%),发生输尿管狭窄1例(1.3%),与对照组比较上述指标差异有统计学意义(P<0.05)。结论采取低压回流冲洗辅助输尿管镜钬激光碎石术治疗输尿管中、上段结石,清石率高、结石残留率低、并发症少,有较好的临床推广应用价值。展开更多
Climatological patterns in wind fluctuations on time scales of 1–10 h are analyzed at a meteorological mast at the Yangmeishan wind farm, Yunnan Province,China, using a 2-yr time series of 10-min wind speed observati...Climatological patterns in wind fluctuations on time scales of 1–10 h are analyzed at a meteorological mast at the Yangmeishan wind farm, Yunnan Province,China, using a 2-yr time series of 10-min wind speed observations. For analyzing the spectral properties of nonstationary wind fluctuations in mountain terrain, the Hilbert-Huang transform(HHT) is applied to investigate climatological patterns between wind variability and several variables including time of year, time of day, wind direction, and pressure tendency. Compared with that for offshore sites, the wind variability at Yangmeishan wind farm has a more distinct diurnal cycle, but the seasonal discrepancies and the differences according to directions are not distinct, and the synoptic influences on wind variability are weaker. There is enhanced variability in spring and winter compared with summer and autumn. For flow from the main direction sector, the maximum wind variability is observed in spring. And the severe wind fluctuations are more common when the pressure tendency is rising.展开更多
文摘目的探讨低压回流冲洗在输尿管镜钬激光碎石术中对结石残留和热损伤的影响。方法将152例输尿管中、上段结石患者分成观察组和对照组,每组76例。2组均使用钬激光碎石术。对照组行常规输尿管镜钬激光碎石术。观察组先将4F导管置至结石上方,导管置于镜外,二次进镜至结石部位,采取吊袋法(高度为95 cm H_(2)O)持续冲洗钬激光碎石术。观察2组手术时间、结石清除率和残留率、术后发热和输尿管狭窄发生率。结果观察组平均手术时间30 min,结石清石率97.4%,结石残留2例(2.63%),术后发热2例(2.63%),发生输尿管狭窄1例(1.3%),与对照组比较上述指标差异有统计学意义(P<0.05)。结论采取低压回流冲洗辅助输尿管镜钬激光碎石术治疗输尿管中、上段结石,清石率高、结石残留率低、并发症少,有较好的临床推广应用价值。
基金supported by the National Natural Science Foundation of China (Grant Nos. 91215302 and 41101045)the "One-Three-Five" Strategic Planning of the Institute of Atmospheric Physics, Chinese Academy of Sciences (Grant No. Y267014601)
文摘Climatological patterns in wind fluctuations on time scales of 1–10 h are analyzed at a meteorological mast at the Yangmeishan wind farm, Yunnan Province,China, using a 2-yr time series of 10-min wind speed observations. For analyzing the spectral properties of nonstationary wind fluctuations in mountain terrain, the Hilbert-Huang transform(HHT) is applied to investigate climatological patterns between wind variability and several variables including time of year, time of day, wind direction, and pressure tendency. Compared with that for offshore sites, the wind variability at Yangmeishan wind farm has a more distinct diurnal cycle, but the seasonal discrepancies and the differences according to directions are not distinct, and the synoptic influences on wind variability are weaker. There is enhanced variability in spring and winter compared with summer and autumn. For flow from the main direction sector, the maximum wind variability is observed in spring. And the severe wind fluctuations are more common when the pressure tendency is rising.
