Application of pressure-controlled ventilation-volume guaranteed in obese patients with obstructive sleep apnea syndrome / 实用医学杂志

Objective To explore the clinical effectiveness of pressure-controlled ventilation-volume guar-anteed(PCV-VG)in obese patients with obstructive sleep apnea syndrome(OSAS)during uvulopalatopharyngo-plasty. Methods 40 obese patients(BMI≥30 kg/m2)with OSAS scheduled for uvulopalatopharyngoplasty under general anesthesia were randomly divided into two groups of volume-controlled ventilation(group V,n = 20)and pressure-controlled ventilation-volume guaranteed(group P,n=20). The heart rate(HR),mean arterial pressure (MAP),arterial partial pressure of oxygen(PaO2)and arterial partial pressure of carbondioxide(PaCO2)were recorded before induction of anesthesia without oxygen inhalation(T0),30 min(T1)and 1 h(T2)after tracheal intubation,and 30 min after extubation(T3). The peak airway pressure(Ppeak),airway resistance(Raw),thoracic compliance (CL),oxygenation index (OI) and respiratory index (RI) were also calculated at T1 and T2 under observation of recovery. Results There were no obvious differences between the two groups of patients before anesthesia and after recovery. Compared with the group V ,PaCO2 ,PPEAK ,Raw at T1 ,T2 and RI at T1 ~ T3 of the group P decreased(P<0.05),while CL at T1,T2 and PaO2,OI at T1~T3 increased(P<0.05). There were no sig-nificant differences in HR ,MAP at the above time points. Conclusions Compared with volume-controlled venti-lation,PCV-VG can effectively enhance thoracic compliance,lower inspiratory pressure and airway resistance ,and decrease intrapulmonary shunt ,which is conductive to improve arterial oxygenation and gas exchange in obese patients with OSAS.

Lentiviral vector-mediated transfection of bone morphogenetic protein 2 gene into endothelial progenitor cells from rat bone marrow / 中国组织工程研究

BACKGROUND:Gene therapy has become a new trend for disease therapy and brought promise for some refractory diseases. The key point is to choose the proper cell, gene and vector. OBJECTIVE:To investigate the effectiveness and feasibility of bone morphogenetic protein 2 (BMP2) gene transfected into endothelial progenitor cells (EPCs) from rat bone marrow for gene therapy. METHODS:The EPCs were isolated, cultured and identified from the bone marrow of Sprague-Dawley rats. Empty vector (LV-eGFP) or BMP2 gene (LV-eGFP-BMP2) was transferred into EPCs by the constructed lentiviral vector (LV). We examined the transfection efficiency by eGFP fluorescence, BMP2 secretion by ELISA, BMP2 expression by Western blot, and compared the capacities of migration, proliferation and anti-apoptosis after transfection in the three groups of normal EPCs, empty vector-EPCs, and BMP2-EPCs. RESULTS AND CONCLUSION:The transfection efficiency of lentiviral vector was 90%. BMP2 gene-transferred EPCs secreted and expressed more BMP2 proteins (P0.05). After successful transfection with lentivirus-BMP2 gene, EPCs can secrete and express more BMP2 protein and show enhanced anti-apoptotic ability without obvious influence on the proliferation and migration capacity.

Expression characters of substance P in rats with lumbar spinal stenosis cansed by cauda equina compressions model / 中国组织工程研究

BACKGROUND: As a pain-related peptide, substance P is closely related with sustained pain in low back and lower extremities caused by lumbar spinal stenosis. However, the expression of substance P in the rat with cauda equina compression rat is not reported.OBJECTIVE: To investigate the content of substance P in spinal cord of rat with lumbar spinal stenosis at different stages.DESIGN: A randomized and controlled experimental study.SETTING: The Orthopedic Department of the First Affiliated Hospital of China Medical University.MATERIALS: The trial was conducted in the Experimental Animal Center of China Medical University within the period from February 2003 to December 2004. Thirty mature male SD rats were randomly and averagely assigned into five groups. One group served as control and in the other four experimental groups the content of substance P of the rats were examined in the 2nd, 4th, 8th and 12th respect week respectively.METHODS: The model of lumbar spinal stenosis was established by compressing cauda equina in rats. The spinal cords were harvested in the 2nd,4th, 8th and 12th respect week respectively for immunohistochemical determination of the expression of substance P (SP) in the posterior horn.MAIN OUTCOME MEASURES: The expression of substance P in the posterior horn at different times. Deeply-stained neurons in the 2nd week group. The mean positive neuron group varied within a certain range and were less than that of the 2nd week group. But they were all more than that of the controls[(5.08 ±0.41),(4.02±0.35), (2.58±0.33), (3.45±0.22) vs(0.85±0.23), t=6.85,5.90,3.49,6.85,P ＜0.05 or P ＜0.01].CONCLUSION: The expression of substance P increases when the cauda equina is compressed. Whether this is because the harmful stimuli increases SP expression and the latter in turn protects spinal cord by reducing the edema of spinal cord warrants more studies.