Diffuse oxygen supply is an important means to improve the indoor oxygen environment of buildings and ensure physiological and psychological health of immigrants in plateau areas.Existing research on oxygen enrichment...Diffuse oxygen supply is an important means to improve the indoor oxygen environment of buildings and ensure physiological and psychological health of immigrants in plateau areas.Existing research on oxygen enrichment strategies at high altitudes has mainly focused on confined spaces under mechanical ventilation,with few studies on the distribution of indoor oxygen concentration under natural ventilation in actual buildings.This study used a verified computational fluid dynamics(CFD)method to investigate the indoor oxygen distribution with practical consideration of natural ventilation at high altitudes.The results showed that the oxygen distribution under wind-driven natural ventilation was more nonuniform than that under buoyancy-driven natural ventilation,with the ratio of local oxygen concentration to overall-mean oxygen concentration,the k value,between 0.8 and 1.3 under wind-driven natural ventilation and between 0.9 and 1.1 under buoyancy-driven natural ventilation.The effects of meteorological condition and oxygen source position on indoor spatial oxygen distribution characteristics were explored with careful examination in human occupied zone under lying,sitting and standing postures.The results can provide implications for effective and energy saving design of indoor oxygen supply system in plateau buildings.展开更多
Objectives: There is no data in the current medical literature on efficacy or accuracy of transcutaneous (tcPCO2) monitoring during jet ventilation for cardiac ablation. The use of tcPCO2 during cardiac ablation proce...Objectives: There is no data in the current medical literature on efficacy or accuracy of transcutaneous (tcPCO2) monitoring during jet ventilation for cardiac ablation. The use of tcPCO2 during cardiac ablation procedures offers the opportunity to compare end-tidal and transcutaneous methods of CO2 measurement before and after the use of the jet ventilation. Comparison of these measurements with arterial blood gas CO2 levels allows evaluation of the accuracy of the tcPCO2 technique for use during jet ventilation. Design: Observational study;patients served as their own controls. Setting: Cardiac electrophysiology laboratory. Participants: 15 adult patients (9 M), ASA III-IV, aged 26 to 82 years (median 66 years) undergoing radiofrequency ablation for atrial fibrillation. Interventions: Jet ventilation (JV) versus conventional ventilation. Measurements and Main Results: Paired measurements of end-tidal CO2 (EtCO2) and transcutaneous CO2 (tcPCO2) were recorded during periods of conventional ventilation. Paired measurements of arterial blood CO2 (PaCO2) levels and tcPCO2 were recorded during JV. ABG samples were drawn at the anesthesiologist’s discretion to assess the patient’s respiratory status. The level of agreement between the three methods was compared using the Bland Altman plot. We found that tcPCO2 values consistently provided a close approximation to PaCO2 levels. The mean difference between tcPCO2 and EtCO2 values in baseline and post-JV was on the order of 3 - 5 mmHg, with standard deviation of 4 - 6 mmHg. This is well within the range of variability that is accepted in clinical practice. Conclusions: These preliminary results suggest that tcPCO2 provides an acceptable estimate of CO2 concentration in arterial blood during JV, as well as prior to and following JV.展开更多
目的探讨无痛胃镜检查中的最佳给氧方式.方法 200例无痛胃镜病人,采用芬太尼与异丙酚复合静脉麻醉,根据给氧方式不同随机分为4组:Ⅰ组,静脉麻醉前后面罩均给氧,氧流量4～5L/min;Ⅱ组,鼻导管给氧,氧流量 4～ 5L/min;Ⅲ组,不给氧,但SpO2...目的探讨无痛胃镜检查中的最佳给氧方式.方法 200例无痛胃镜病人,采用芬太尼与异丙酚复合静脉麻醉,根据给氧方式不同随机分为4组:Ⅰ组,静脉麻醉前后面罩均给氧,氧流量4～5L/min;Ⅱ组,鼻导管给氧,氧流量 4～ 5L/min;Ⅲ组,不给氧,但SpO2下降至93%及以下时用面罩给氧;Ⅳ组,高频喷射通气,驱动压力1kg/cm2,频率100次/min.记录病人麻醉前,麻醉后2,4,6,8,10min时的呼吸次数及SpO2.结果麻醉后2,4,6min所有病人呼吸频率均较麻醉前显著降低( P ＜0.05),8min后呼吸频率逐渐恢复至麻醉前水平.Ⅱ组SpO2麻醉后2min有一明显降低( P ＜0.05),50例中有9例需改行面罩给氧.Ⅲ组SpO2在2,4,6,8min均较麻醉前明显降低( P ＜0.05),50例中有23例病人因SpO2低于93%而需改为面罩给氧.Ⅰ、Ⅳ组病人麻醉前后SpO2均在正常范围,无显著性差异( P ＞0.05).结论无痛胃镜检查,不给氧不可取,用鼻导管给氧存在一定风险,而用麻醉机面罩给氧和进行高频喷射通气给氧是安全有效的方法.展开更多
目的探讨高浓度氧通气对全身麻醉手术患者血清涎液化糖链蛋白6(krebs von den lungen 6,KL-6)及细胞因子表达的影响。方法经医院伦理学会批准,选取重庆市巴南区人民医院2018年1月2018年6月行全身麻醉手术者96例,按照随机数字表法分为A组...目的探讨高浓度氧通气对全身麻醉手术患者血清涎液化糖链蛋白6(krebs von den lungen 6,KL-6)及细胞因子表达的影响。方法经医院伦理学会批准,选取重庆市巴南区人民医院2018年1月2018年6月行全身麻醉手术者96例,按照随机数字表法分为A组(100%氧吸入)和B组(60%氧吸入),每组48例。分别于全身麻醉前30 min(T0)、全身麻醉后60 min(T1)、全身麻醉后120 min(T2)、全身麻醉后180 min(T3)、机械通气结束后60 min(T4)抽取桡动脉血行动脉血气分析。并于T0、T1、T2.T3及T4时间点抽取中心静脉血,检测血清KL-6、肿瘤坏死因子-a(TNF-x)、白细胞介素-8(IL-8)水平。结果两组患者全身麻醉前血清KL-6.TNF-α、IL-8组间比较差异无统计学意义(P>0.05)。全身麻醉后血清KL-6、TNF-α、IL-8均逐渐上升,其中A组T1血清KL-6、TNF-α、IL-8即显著高于T0[KL-6(U/mL):173.22±31.19比101.13±22.31;TNF-a(pg/mL):5.99±2.81比3.24±1.98;IL-8(pg/mL):128.11±32.21比98.22±19.77,均P<0.05]。B组T1血清KL-6高于T0[KL-6(U/mL):121.64±33.55比99.29±24.93]。T2血清TNF-α、IL-8高于TO0[TNF-a(pg/mL):4.41±2.71比3.24±1.98;IL-8(pg/mL):123.21±31.47比98.22±19.77,均P<0.05]。A组T1-T4血清KL-6、TNF-α.IL-8分别为[KL-6:(173.22±31.19)(189.38±39.11)(236.16±49.37)(210.04±38.66)U/mL;TNF-a(5.99±2.81)(6.21±2.56)(6.92±3.01)(6.31±2.88)pg/mL;IL-8:(128.11±32.21)(155.17±42.19)(188.28±40.33)(171.15±43.11)pg/mL],均高于同时点B组[KL-6:(121.64±33.55>/(141.33±36.74)(168.04±42.55)(166.39±44.63)U/mL;TNF-α(3.31±2.11)(4.41±2.71)(4.50±3.12)(4.39±2.41)pg/mL;IL-8:(103.12±23.3(123.21±31.47)(135.194.33)(137.339.22)pg/mL],差异均有统计学意义(均P<0.05)。结论全身麻醉术中高浓度氧气吸入可引起患者血清细胞因子及KL-6表达增多。展开更多
基金We extend our gratitude to the funding supports of National Natural Science Foundation of China(No.51878532)Shaanxi Province Natural Science Foundation Research Project of China(No.2019JQ-392)Independent Research and Development project of State Key Laboratory of Green Building in Western China(No.LSZZ202008).
文摘Diffuse oxygen supply is an important means to improve the indoor oxygen environment of buildings and ensure physiological and psychological health of immigrants in plateau areas.Existing research on oxygen enrichment strategies at high altitudes has mainly focused on confined spaces under mechanical ventilation,with few studies on the distribution of indoor oxygen concentration under natural ventilation in actual buildings.This study used a verified computational fluid dynamics(CFD)method to investigate the indoor oxygen distribution with practical consideration of natural ventilation at high altitudes.The results showed that the oxygen distribution under wind-driven natural ventilation was more nonuniform than that under buoyancy-driven natural ventilation,with the ratio of local oxygen concentration to overall-mean oxygen concentration,the k value,between 0.8 and 1.3 under wind-driven natural ventilation and between 0.9 and 1.1 under buoyancy-driven natural ventilation.The effects of meteorological condition and oxygen source position on indoor spatial oxygen distribution characteristics were explored with careful examination in human occupied zone under lying,sitting and standing postures.The results can provide implications for effective and energy saving design of indoor oxygen supply system in plateau buildings.
文摘Objectives: There is no data in the current medical literature on efficacy or accuracy of transcutaneous (tcPCO2) monitoring during jet ventilation for cardiac ablation. The use of tcPCO2 during cardiac ablation procedures offers the opportunity to compare end-tidal and transcutaneous methods of CO2 measurement before and after the use of the jet ventilation. Comparison of these measurements with arterial blood gas CO2 levels allows evaluation of the accuracy of the tcPCO2 technique for use during jet ventilation. Design: Observational study;patients served as their own controls. Setting: Cardiac electrophysiology laboratory. Participants: 15 adult patients (9 M), ASA III-IV, aged 26 to 82 years (median 66 years) undergoing radiofrequency ablation for atrial fibrillation. Interventions: Jet ventilation (JV) versus conventional ventilation. Measurements and Main Results: Paired measurements of end-tidal CO2 (EtCO2) and transcutaneous CO2 (tcPCO2) were recorded during periods of conventional ventilation. Paired measurements of arterial blood CO2 (PaCO2) levels and tcPCO2 were recorded during JV. ABG samples were drawn at the anesthesiologist’s discretion to assess the patient’s respiratory status. The level of agreement between the three methods was compared using the Bland Altman plot. We found that tcPCO2 values consistently provided a close approximation to PaCO2 levels. The mean difference between tcPCO2 and EtCO2 values in baseline and post-JV was on the order of 3 - 5 mmHg, with standard deviation of 4 - 6 mmHg. This is well within the range of variability that is accepted in clinical practice. Conclusions: These preliminary results suggest that tcPCO2 provides an acceptable estimate of CO2 concentration in arterial blood during JV, as well as prior to and following JV.
文摘目的探讨无痛胃镜检查中的最佳给氧方式.方法 200例无痛胃镜病人,采用芬太尼与异丙酚复合静脉麻醉,根据给氧方式不同随机分为4组:Ⅰ组,静脉麻醉前后面罩均给氧,氧流量4～5L/min;Ⅱ组,鼻导管给氧,氧流量 4～ 5L/min;Ⅲ组,不给氧,但SpO2下降至93%及以下时用面罩给氧;Ⅳ组,高频喷射通气,驱动压力1kg/cm2,频率100次/min.记录病人麻醉前,麻醉后2,4,6,8,10min时的呼吸次数及SpO2.结果麻醉后2,4,6min所有病人呼吸频率均较麻醉前显著降低( P ＜0.05),8min后呼吸频率逐渐恢复至麻醉前水平.Ⅱ组SpO2麻醉后2min有一明显降低( P ＜0.05),50例中有9例需改行面罩给氧.Ⅲ组SpO2在2,4,6,8min均较麻醉前明显降低( P ＜0.05),50例中有23例病人因SpO2低于93%而需改为面罩给氧.Ⅰ、Ⅳ组病人麻醉前后SpO2均在正常范围,无显著性差异( P ＞0.05).结论无痛胃镜检查,不给氧不可取,用鼻导管给氧存在一定风险,而用麻醉机面罩给氧和进行高频喷射通气给氧是安全有效的方法.
文摘目的探讨高浓度氧通气对全身麻醉手术患者血清涎液化糖链蛋白6(krebs von den lungen 6,KL-6)及细胞因子表达的影响。方法经医院伦理学会批准,选取重庆市巴南区人民医院2018年1月2018年6月行全身麻醉手术者96例,按照随机数字表法分为A组(100%氧吸入)和B组(60%氧吸入),每组48例。分别于全身麻醉前30 min(T0)、全身麻醉后60 min(T1)、全身麻醉后120 min(T2)、全身麻醉后180 min(T3)、机械通气结束后60 min(T4)抽取桡动脉血行动脉血气分析。并于T0、T1、T2.T3及T4时间点抽取中心静脉血,检测血清KL-6、肿瘤坏死因子-a(TNF-x)、白细胞介素-8(IL-8)水平。结果两组患者全身麻醉前血清KL-6.TNF-α、IL-8组间比较差异无统计学意义(P>0.05)。全身麻醉后血清KL-6、TNF-α、IL-8均逐渐上升,其中A组T1血清KL-6、TNF-α、IL-8即显著高于T0[KL-6(U/mL):173.22±31.19比101.13±22.31;TNF-a(pg/mL):5.99±2.81比3.24±1.98;IL-8(pg/mL):128.11±32.21比98.22±19.77,均P<0.05]。B组T1血清KL-6高于T0[KL-6(U/mL):121.64±33.55比99.29±24.93]。T2血清TNF-α、IL-8高于TO0[TNF-a(pg/mL):4.41±2.71比3.24±1.98;IL-8(pg/mL):123.21±31.47比98.22±19.77,均P<0.05]。A组T1-T4血清KL-6、TNF-α.IL-8分别为[KL-6:(173.22±31.19)(189.38±39.11)(236.16±49.37)(210.04±38.66)U/mL;TNF-a(5.99±2.81)(6.21±2.56)(6.92±3.01)(6.31±2.88)pg/mL;IL-8:(128.11±32.21)(155.17±42.19)(188.28±40.33)(171.15±43.11)pg/mL],均高于同时点B组[KL-6:(121.64±33.55>/(141.33±36.74)(168.04±42.55)(166.39±44.63)U/mL;TNF-α(3.31±2.11)(4.41±2.71)(4.50±3.12)(4.39±2.41)pg/mL;IL-8:(103.12±23.3(123.21±31.47)(135.194.33)(137.339.22)pg/mL],差异均有统计学意义(均P<0.05)。结论全身麻醉术中高浓度氧气吸入可引起患者血清细胞因子及KL-6表达增多。
