Five factors influencing minute volume during high frequency jet ventilation were studied on lung modal by stepwise regression analysis. Among these factors, driving pressure is of the greatest dominance. Others are i...Five factors influencing minute volume during high frequency jet ventilation were studied on lung modal by stepwise regression analysis. Among these factors, driving pressure is of the greatest dominance. Others are inspiratory and expiratory time ratio, tube diameter, frequency of ventilation and needle distanee, in the order of their impact. A formula was also developed for predicting the parameters.The result is quite satisfactory.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
Hypoxemia during one-lung ventilation （OLV） is normal. Different ways of improving SpO2 on OLV include intermittent inflation ot the collapsed lung with oxygen, lung recruitment, and application of continuous positi...Hypoxemia during one-lung ventilation （OLV） is normal. Different ways of improving SpO2 on OLV include intermittent inflation ot the collapsed lung with oxygen, lung recruitment, and application of continuous positive airway pressure （CPAP） to the nondependent lung. This case report described the use of CPAP to the right lung, which was converted to high-frequency jet ventilation （HFJV） of the middle and lower lobes during fight upper lobe sleeve resection.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
文摘Five factors influencing minute volume during high frequency jet ventilation were studied on lung modal by stepwise regression analysis. Among these factors, driving pressure is of the greatest dominance. Others are inspiratory and expiratory time ratio, tube diameter, frequency of ventilation and needle distanee, in the order of their impact. A formula was also developed for predicting the parameters.The result is quite satisfactory.
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Hypoxemia during one-lung ventilation （OLV） is normal. Different ways of improving SpO2 on OLV include intermittent inflation ot the collapsed lung with oxygen, lung recruitment, and application of continuous positive airway pressure （CPAP） to the nondependent lung. This case report described the use of CPAP to the right lung, which was converted to high-frequency jet ventilation （HFJV） of the middle and lower lobes during fight upper lobe sleeve resection.
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.
