Forty critical patients with respiratory failure in the intensive care unit were randomly divided into two groups,Group A with administration of parenteral nutritino(PN) and Group B,no parenteral nutrition given.Blood gas analysis and respiratory monitoring showed that the respiratory rate,pH、PaO2、PaCO2 and HCO3- had no marked difference between the two groups.But in Group A there was a slight decrease of Pao2/FiO2 and a marked increase of A-aDO2 and the pulmonary shunt.This study indicates that the content of fat emulsion and hydrocarbon in PN may be the main factor that affects the respiratory function.
Objective To compare the effects of oxygen therapy and local pressurization in alleviating plateau hypoxia at high altitude. Methods Forty-five healthy male soldiers were investigated at an altitude of 3992 meters. The subjects were randomly divided into three groups, ie. an oxygen inhalation group, a single-soldier oxygen increasing respirator ( SOIR) group and a BiPAP group. The oxygen inhalation group was treated with oxygen inhalation via nasal catheter at 2 L/ min. SOIR was used to assist breath in the SOIR group. The BiPAP group were treated with bi-level positive airway pressure ventilation, with IPAP of 10 cm H2O and EPAP of 4 cmH2 O. PaO2, PaCO2, SpO2 and heart rate were measured before and 30 minutes after the treatment. Results There were continuous increase of PaO2 from ( 53. 30 ±4. 88) mm Hg to( 58. 58 ±5. 05) mm Hg and ( 54. 43 ±3. 01) mm Hg to ( 91. 36 ±10. 99) mm Hg after BiPAP ventilation and oxygen inhalation, respectively ( both P lt; 0. 01) . However, the PaO2 of the SOIR group was decreased from( 56. 00 ±5. 75) mm Hg to ( 50. 82 ±5. 40) mm Hg( P lt; 0. 05 ) . In the other hand, the PaCO2 was increased from ( 30. 41 ±1. 51) mmHg to ( 32. 56 ±2. 98) mm Hg in the oxygen inhalation group ( P lt; 0. 05) , declined from( 28. 74 ±2. 91) mm Hg to ( 25. 82 ±4. 35) mm Hg in the BiPAP group( P lt;0. 05) ,and didn’t change significantly from( 28. 65 ±2. 78) mm Hg to ( 29. 75 ±3. 89) mmHg in the SOIR group ( P gt;0. 05) . Conclusions Both BiPAP ventilation and oxygen inhalation can alleviate plateau hypoxia by improving PaO2 at 3992 meter altitude while SOIR has no significant effect.
Objective To explore the value of CT obstruction index ( CTI) on CT pulmonary angiography( CTPA) in estimating the severity of acute pulmonary embolism. Methods 27 patients with pulmonary embolism were retrospectively studied. Pulmonary embolism was diagnosed by CTPA. The correlations between CTI and arterial blood gas and shock index ( SI) were assessed by Spearman rank correlation analysis. Blood gas values and SI were comparatively evaluated belowand above different CTI cutoffvalues( 30% , 40% , 50% , and 60% , respectively) . Results A significant correlation was found between CTI and PaO2 ( r = - 0. 416, P =0. 031) , and also between CTI and P( A-a) O2 ( r =0. 468, P =0. 014) . PaO2 ( P =0. 027) and P( A-a) O2 ( P = 0. 034) were significantly different between pulmonary embolism patients above and below the CTI 60% cutoff value( P lt;0. 05) . Conclusions CTI is an effective index to evaluate the severity of pulmonary embolism. CTI gt;60% might be an indicator of higher severity.
Objective To evaluate the security and validity of the acute extreme hypervolemic hemodilution (AEHH) in spine surgery. Methods Thirteen patients(8 males, 5 females; age, 16-65 years; weight, 50-75 kg) who had undergone major spine operations were enrolled in this study. Eleven of them had undergone anterior decompression, who were given the grafting and the internal fixation for their thoracolumber spinal burst fractures; the other 2 patients were given the correction operation for their scoliosis. The baselines of the haematocrit (Hct）were 0.363-0.481 before operation. The patients had no cardiac, pulmonary, hepatic or renal dysfunction or coagulation abnormality. The hemodynamic status and the haematocrit were observed during operation. The parameters of thromboelastography (TEG)，arterial blood gas, and electrolytes were measured and observed at the following time points: before AEHH, after AEHH, 60 minutes after AEHH, 120 minutes after AEHH, and the end of the operation. The total fluid volume was recorded. Results The autologous blood volume was1 050-1 575 ml (average,1 419±198 ml), plasma substitute 2 100-3 150 ml (average,2 838±397 ml), blood loss1 000-3 130 ml (average, 1 747±743 ml), urine 450-1 270 ml (average, 871±374 ml), and the net blood transfusion 1 206-2 661 ml(1 863±598 ml). The homogenous blood of 400 ml was transfused in 1 patient for making upthe blood loss of 3 130 ml. There were no statistically significant differencesin the hemodynamic measurements, arterial blood gas, and electrolyte variables when compared with the baseline values before the hemodilution (Pgt;0.05). The reaction time of TEG was longer 60 minutes after AEHH than before AEHH (Plt;0.05); the other parameters of TEG had no differences when compared with the baseline values (Pgt;0.05). Conclusion The AEHH is safe and efficient in reduction of the perioperative homogenous blood transfusion in spine surgery.
【摘要】 目的 观察胎羊宫内心脏介入手术胎羊血气及血浆炎性细胞因子的变化。方法 8只怀孕双胎山羊,双胎之一为实验组,在相同麻醉条件下,实验组进行胎羊心脏介入治疗,并抽取血样标本。监测胎羊的心率、血气、乳酸值,运用ELISA法检测治疗组及对照组胎羊白介素(IL)1、IL6、IL8及肿瘤坏死因子(TNFα)。结果 2只胎羊因手术中发生心包填塞死亡,存活的6只胎羊手术前pH值较手术后有明显下降(Plt;005),手术前后乳酸浓度上升(Plt;005),PCO2、PO2差异无统计学意义(Pgt;005),手术前血浆IL1、IL6、IL8的浓度较手术后高(Plt;005),手术前后TNFα的浓度变化无统计学意义(Pgt;005)。结论 胎羊宫内心脏介入手术可引起胎羊血浆pH值下降,乳酸浓度上升,及细胞因子IL1、IL6、IL8浓度上升。【Abstract】 Objective To observe the change of blood gas and inflammatory cytokines during intrauterine cardiac intervention surgery on the fetal lambs. Methods Eight pregnant goats with two fetal in each goat were included. With the same anesthesia condition, one of the twin fetus was chose to perform the intrauterine cardiac intervention surgery. The fetal heart beating rate was monitored, and blood samples of the fetus were taken to do the blood gas analysis and to detect the concentration of inflammatory cytokines (IL1, IL6, IL8, and TNFα). Results Two of the eight fetal lambs which was died in the operation because of pericardial tapenade. In the other six survived fetus, the PH was lower than after the surgery, and the concentrations of lactic acid, IL1, IL6, and IL8 are higher than after the surgery. There was no significant difference of PCO2,PO2 and TNFα between before and after the surgery. Conclusion The intrauterine cardiac intervention surgery can make the PH of fetal plasma lower and the concentrations of lactic acid and IL1, IL6, IL8 higher.
Objective To study the application of pressure regulated volume control ventilation in respiratory support after liver transplantation. MethodsTwenty patients underwent liver transplantation were randomly averagely divided into two groups: pressure regulated vlume control ventilation (PRVCV) group and volume control (VC) group. The parameters of respiratory mechanics, hemodynamics and blood gas analysis of patients in two groups were compared, such as oxygen delivery (DO2), oxygen consumption (VO2), oxygen incepation ratio (O2ER), arteriovenous oxygen content difference (C(a-v)O2), cardiac output (CO), mean arterial pressure (mABP), mean pulmonary arterial pressure (mPAP), alveolar-arterial PO2 difference 〔P(A-a)O2〕, gas exchange index (PaO2/FiO2)， ratio of shunted blood to total perfusion (Qs/Qt), peak inspiratory pressure (PIP) and mean airway pressure (mAP). Results The P(A-a)O2 and Qs/Qt were significantly decreased in PRVCV group than those in VC group 〔P(A-a)O2: (101.42±28.07) mm Hg vs. (136.76±39.13) mm Hg; Qs/Qt: (1.78±0.86)% vs. (3.28±0.99)%〕, P＜0.05, P＜0.05， while the C(a-v)O2 and O2ER were significantly increased 〔C(a-v)O2: (20.70±10.41) mm Hg vs. (12.83±2.49) mm Hg; O2ER: (16.34±9.79)% vs. (9.37±1.83)%〕, P＜0.05, P＜0.01. There was no difference in the hemodynamics and airway pressure parameters between PRVCV group and VC group. Conclusion PRVCV mode could be a more suitable mechanical ventilation pattern to patients after liver transplantation.