摘要
目的 探讨神经调节辅助通气(NAVA)对ARDS呼吸机相关性膈肌功能障碍(VIDD)的预防作用.方法 将20只成年新西兰大白兔按随机数字表法分为对照组、容量控制通气组(VC组)、压力支持通气组(PSV组)和NAVA通气组(NAVA组),每组5只.VC、PSV及NAVA组在机械通气4 h后取膈肌标本,对照组麻醉后立即取膈肌标本.测定各组膈肌中丙二醛、超氧化物歧化酶(SOD)以及还原型谷胱甘肽(GSH)含量,观察各组膈肌纤维病理结构的改变.结果 (1)丙二醛:NAVA组膈肌中丙二醛含量为(0.28±0.19)nmol/mg,与对照组的(0.15±0.06)nmol/mg、PSV组的(0.30±0.11)nmol/mg比较,差异无统计学意义(F=2.730,P>0.05);VC组膈肌中丙二醛含量为(0.40±0.16)nmol/mg,明显高于对照组(P<0.05).(2)SOD:NAVA组膈肌中SOD含量为(94±9)U/mg,与对照组的(111±12)U/mg、PSV组的(93±4)U/mg比较,差异无统计学意义(F=4.422,P>0.05);VC组膈肌中SOD含量为(80±21)U/mg,明显低于对照组(P<0.05).(3)GSH:NAVA组膈肌中丙二醛含量为(5.6±1.0)mg/g,与对照组的(5.3±1.0)mg/g、PSV组的(4.5±1.2)mg/g比较,差异无统计学意义(F=3.001,P>0.05);VC组膈肌中GSH含量为(3.3±1.7)mg/g,明显低于对照组(P<0.05).(4)光镜观察:VC组出现肌纤维变性、坏死,部分肌纤维萎缩;NAVA、PSV组以及对照组肌纤维形态基本正常.(5)电镜观察:VC组肌原纤维断裂,线粒体肿胀;NAVA组、PSV组以及对照组超微结构无明显异常.(6)膈肌纤维横截面积:NAVA组平均肌纤维横截面积(像素)为2573±278,与对照组的3070+175、PSV组的2508±670比较,差异无统计学意义(F=1.775,P>0.05);VC组Ⅱ型肌纤维横截面积为2210±971,明显低于对照组的3477±187(P<0.05).结论 与控制通气相比较,NAVA可减轻ARDS膈肌氧化应激、膈肌萎缩和膈肌结构损伤,NAVA较控制通气更能预防VIDD
Objective To evaluate the effect of neurally adjusted ventilatory assist (NAVA) on prevention of ventilator-induced diaphragmatic dysfunction (VIDD) in ARDS rabbits.Methods Twenty New Zealand white rabbits were randomly divided into 4 groups: ( 1 ) control group ( n = 5 ); ( 2 ) Volume control (VC) group ( n = 5 ); ( 3 ) Pressure support ( PSV ) group ( n = 5 ); (4) NAVA group ( n = 5 ).In VC, PSV and NAVA groups, the rabbits were killed and the diaphragm was removed after 4 hours of ventilation.Animals in the control group were not mechanically ventilated, and the diaphragm was also removed immediately after anesthetizing.In all rabbits, malondialdehyde ( MDA), superoxide disrmutase (SOD) and glutathione(GSH) of diaphragm were measured.Structure of diaphragm was observed by light microscope, electron microscope, constituent ratio and mean cross-sectional area (CSA) of diaphragm fiber.Results (1)MDA: Compared with the control [(0.15 ±0.06)nmol/mg], PSV group[(0.30 ±0.11)nmol/mg], there was no significant difference in MDA of diaphragm in NAVA group [( 0.28 ± 0.19 )nmol/mg] (F = 2.730, P 〉 0.05).MDA in VC group [(0.40 ±0.16)nmol/mg] was significantly higher than the control group (P〈0.05).(2) SOD: Compared with control [( 111 ± 12) U/mg], PSV group [(93 ± 4) U/mg], there was no significant difference in SOD of diaphragm in NAVA group [( 94 ± 9 )U/mg] (F=4.422,P 〉0.05).SOD in VC group [(80 ±21 )U/mg] was significantly lower than the control group(P 〈0.05).(3)GSH: Compared with control [(5.3 ± 1.0)mg/g] and PSV group [(4.5 ±1.2)mg/g], there was no significant difference in GSH of diaphragm in NAVA group [(5.6 ± 1.0) mg/g](F =3.001 ,P 〉 0.05 ).GSH in VC group [(3.3 ± 1.7)mg/g] is significantly lower than control and NAVA groups ( P 〈 0.05 ).( 4 ) Light microscope: In VC group, many changes were observed in the muscle, such as myofibro
出处
《中华结核和呼吸杂志》
CAS
CSCD
北大核心
2011年第4期288-293,共6页
Chinese Journal of Tuberculosis and Respiratory Diseases
基金
江苏省自然科学基金(BK2008298)
江苏省医学领军人才基金(2006)
江苏省135重点人才基金(2007)
江苏省科技发展计划(BS2007045)
关键词
呼吸
人工
呼吸窘迫综合征
成人
膈
Respiration, artificial
Respiratory distress syndrome, adult
Diaphragm