首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 125 毫秒
1.
目的:探讨骨密度与青少年Ⅰ型神经纤维瘤病(neurofibromatosis1,NF-1)性脊柱侧凸患者Cobb角的关系。方法:NF-1伴脊柱侧凸组共有患者18例,年龄10~18岁,平均14.9岁,侧凸Cobb角40°~132°(平均81.4°);同年龄非脊柱畸形患者(对照组)25例,年龄11~19岁,平均15.6岁,所有研究对象均行双能X线吸收仪测量非优势侧的股骨近端和腰椎(L2~L4)的骨密度(bone mineral density,BMD),将两组受试者的测量结果进行t检验比较,并对NF-1伴脊柱侧凸组患者的BMD检测结果与侧凸Cobb角进行相关性分析。结果:两组受试者在年龄、性别比例无明显差异(P0.05),青少年NF-1伴脊柱侧凸患者所测各部位的骨密度均明显低于对照组(P0.01),腰椎(L2~L4)平均骨密度(0.61g/cm2)明显低于对照组(1.03g/cm2),腰椎骨密度的降低比股骨明显,NF-1伴脊柱侧凸组患者腰椎及非优势侧股骨近端BMD与侧凸Cobb角无显著性相关(P0.05)。结论:青少年NF-1伴脊柱侧凸患者存在全身性的骨量减低,其与侧凸的严重程度无关,可能与NF-1伴脊柱侧凸的发病机理有关。  相似文献   

2.
目的:比较单纯后路矫形术和一期前路松解、Halo-股骨髁上牵引加二期后路矫形术治疗成人特发性脊柱侧凸的疗效。方法:选取我院脊柱外科2003年1月~2007年12月收治的有完整影像学资料、Cobb角65°~90°的成人特发性脊柱侧凸患者30例,年龄20~30岁,平均23.4岁。均为初次手术,术前无神经损害。根据不同手术方法分为两组,行单纯后路矫形术的14例患者为A组,行一期前路松解、Halo-股骨髁上牵引及二期后路矫形术的16例患者为B组。两组患者术前侧凸Cobb角、胸椎后凸角、年龄、性别比、侧凸类型相匹配。随访时间为12~72个月,平均40个月。比较两组患者手术时间、出血量、住院时间、并发症情况、侧凸矫正率和冠状面平衡情况。结果:平均手术时间和平均住院时间A组分别为6.7±1.2h和24±18d,B组分别为9.9±1.4h和41±10d,B组均显著长于A组(P<0.05)。所有病例术后均无瘫痪、呼吸衰竭、死亡等并发症发生。术后侧凸矫正率A组为(51.3±11.8)%,B组为(64.5±11.6)%,B组显著大于A组(P<0.05);胸椎后凸角、C7中垂线与骶骨中线的距离A组为20.6°±8.4°、1.32±0.65cm,B组为20.4°±6.7°、1.30±0.70cm,两组比较均无显著性差异(P>0.05)。末次随访时A组侧凸矫正丢失率为(3.5±2.4)%,B组为(2.8±1.5)%,两组无显著性差异(P>0.05)。结论:两种治疗方案治疗中度成人特发性脊柱侧凸均可获得较好的畸形矫正,一期前路松解、Halo-双侧股骨髁上牵引可以增加侧凸Cobb角矫正率,但是存在显著增加手术时间和住院时间等不足。  相似文献   

3.
同种异体与自体骨移植治疗脊柱侧凸的前瞻性研究   总被引:12,自引:0,他引:12  
目的探讨同种异体骨移植在脊柱侧凸后路融合术中的使用效果。方法自1995年3月~2000年3月,前瞻性对60例脊柱侧凸患者行同种异体骨或自体骨移植后路矫形融合术,男19例,女41例。将其随机分为A组(30例)单纯使用同种异体骨移植和B组(30例)采用自体髂骨移植。A组中先天性脊柱侧凸16例、特发性脊柱侧凸12例、神经纤维瘤病和马凡氏综合征各1例。手术时平均年龄14.5岁(6~32岁),术前胸弯平均86.6°(47°~116°),平均融合节段8个(4~10个)。B组中先天性脊柱侧凸15例、特发性脊柱侧凸9例、神经纤维瘤病5例、马凡氏综合征1例。手术时平均年龄13.7岁(11~21岁),术前胸弯平均77.8°(42°~101°),平均融合节段7个(5~10个)。对两组患者的平均手术时间、失血量、并发症、矫形丢失进行对比分析。结果术后随访2~6年,平均4年5个月。与B组相比,A组患者手术时间明显缩短,失血量大大减少。最终随访时,A组平均Cobb角为44°(31°~73°),平均丢失8°;B组平均Cobb角为41°(24°~68°),平均丢失6°。A组和B组中分别有3例和2例患者出现了假关节。A组有1例患者出现伤口浅表感染。在平均矫形丢失和并发症发生率方面两组之间差异无显著性意义(P >0.05),但B组中有6例出现了供骨部位疼痛。结论在脊柱后路融合术中,尤其需要大量骨移植  相似文献   

4.
目的:对青少年发育不良性腰椎滑脱症患者合并脊柱侧凸的情况进行调查并对侧凸情况做术后随访。方法:回顾性分析2007年3月~2017年10月于我院行滑脱复位固定融合手术治疗的28例青少年发育不良性腰椎滑脱症患者,滑脱节段均为L5,依据Meyerding滑脱分度将其分为重度滑脱(Ⅲ、Ⅳ、Ⅴ度)组与轻度滑脱(Ⅰ、Ⅱ度)组。以术前全脊柱正侧位X线片评估两组患者有无脊柱侧凸(Cobb角≥10°诊断为脊柱侧凸)、滑脱情况(滑脱程度、Dubousset腰骶角)以及脊柱-骨盆矢状位参数(骨盆入射角、骶骨倾斜角、骨盆倾斜角)。青少年腰椎滑脱合并的脊柱侧凸分为特发性侧凸和痉挛/疼痛性侧凸两大类,其中痉挛/疼痛性侧凸又分为单纯痉挛性侧凸和"滑脱性"侧凸两种,"滑脱性"侧凸主要由滑脱椎体的旋转造成。对有侧凸的患者测量其末次随访时的侧凸角度以了解侧凸改善情况。结果:发育不良性重度腰椎滑脱15例,年龄12.5±2.6岁,男2例,女13例;轻度滑脱者13例,年龄14.5±2.6岁,男6例,女7例,两组年龄、性别比例及各脊柱-骨盆矢状位参数均无统计学差异(P0.05)。重度滑脱组的Dubousset腰骶角明显小于轻度滑脱组(55.6°±17.0°vs.83.3°±18.4°,P0.05)。28例患者中合并脊柱侧凸者14例,其中重度滑脱组合并脊柱侧凸13例,轻度滑脱组中仅1例符合脊柱侧凸诊断,两组合并侧凸比例有统计学差异(86.7%vs.7.7%,P0.001)。重度滑脱患者术前冠状位平均Cobb角明显大于轻度滑脱患者(18.1°±13.0°vs.4.6°±3.7°,P=0.001)。重度滑脱组中脊柱侧凸的构成情况:特发性侧凸5例,Cobb角11.6°~52.6°,平均30.2°±17.0°;痉挛/疼痛性侧凸8例,其中单纯痉挛性侧凸4例(Cobb角12.5°~17.5°,平均14.8°±2.1°),"滑脱性"侧凸4例(Cobb角11.2°~12.6°,平均11.9°±0.6°)。对13例重度滑脱伴侧凸患者进行术后随访,其中12例获得随访,随访时间为1~100个月(23.8±28.7个月),末次随访时单纯痉挛性侧凸的平均矫正率为92%,特发性脊柱侧凸的平均矫正率为7.5%,"滑脱性"脊柱侧凸的平均矫正率为4%。结论:青少年发育不良性腰椎滑脱症患者中,重度滑脱患者合并脊柱侧凸的比例高于轻度滑脱者,发育不良性重度腰椎滑脱与脊柱侧凸可能具有相关性,其中单纯痉挛性侧凸在滑脱复位固定融合术后可大部分自发矫正。  相似文献   

5.
目的:观察Ⅰ型神经纤维瘤病(NF1)营养不良性脊柱侧凸患者椎体生长板软骨细胞的功能变化,探讨其在脊柱营养不良性改变中的作用。方法:共有8例NF1营养不良性脊柱侧凸患者纳入本研究,男5例,女3例,年龄9~15岁,平均11.8±2.0岁。在矫形术中取营养不良区(顶椎区,A组)、非营养不良区(端椎区,B组)椎体生长板软骨及髂软骨(C组)。采用两步酶消化结合植块法进行软骨细胞培养。应用Real-time PCR法检测软骨细胞中可聚蛋白多糖、Ⅱ型胶原及神经纤维瘤蛋白的mRNA表达。结果:A组软骨细胞中可聚蛋白多糖mRNA的表达量为0.04±0.02,B组为0.09±0.04,C组为0.13±0.07,A组显著低于B组和C组(P<0.05)。A组Ⅱ型胶原的mRNA表达量为0.91±0.04,B组为0.96±0.07,C组为1.03±0.10,A组显著低于C组(P<0.05),A组与B组差别无统计学意义(P>0.05)。A组神经纤维瘤蛋白的mRNA表达量为0.39±0.30,B组为1.34±0.63,C组为1.00±0.51,A组较B、C组均明显降低(P<0.05)。各指标在B组与C组间均无统计学差异(P>0.05)。结论:NF1营养不良性脊柱侧凸患者营养不良区椎体生长板软骨细胞分化功能存在明显缺陷,其可能是脊柱营养不良性改变的基础。  相似文献   

6.
特发性脊柱侧凸两侧椎旁肌的影像学差异及其临床意义   总被引:7,自引:0,他引:7  
目的研究特发性脊柱侧凸两侧椎旁肌的影像学变化,并探讨其与特发性脊柱侧凸病因的关系。方法共分三组:特发性脊柱侧凸组39例,男6例,女33例,平均年龄(14.0±1.1)岁。Cobb角40°~108°,平均55.8°±16.7°。KingⅡ型20例,KingⅢ型19例,顶椎位于T6 ̄T11。其中Cobb角>50°者18例,Cobb角≤50°者21例。先天性脊柱侧凸组25例,男12例,女13例,平均年龄(13.6±1.6)岁。Cobb角40°~155°,平均78.9°±32.1°,顶椎位于T5~T12。12例非脊柱侧凸病例作为对照组,男4例,女8例,平均年龄(23.2±5.8)岁。脊柱侧凸病例取顶椎区水平位MR像,对照组取上位腰椎非病变区水平位MR像,测量两侧椎旁肌的面积和Balance序列平均信号值。结果特发性脊柱侧凸和先天性脊柱侧凸组顶椎区凹侧椎旁肌平均横截面积明显小于凸侧(P<0.05),MRIBalance序列平均信号值明显高于凸侧(P<0.05)。对照组两侧差异无统计学意义(P>0.05)。特发性脊柱侧凸组中Cobb角>50°的病例顶椎区凹凸侧椎旁肌平均横截面积比值和平均信号比值与Cobb角≤50°的病例相比,差异无统计学意义(P>0.05)。结论特发性脊柱侧凸患者两侧椎旁肌存在影像学差异,这种差异可能系脊柱侧凸的继发性改变,且对判断脊柱侧凸的进展性具有潜在的临床意义。  相似文献   

7.
目的探讨骨质疏松与青少年休门病(Scheuermann’s disease,SD)的关系。方法研究对象包括青少年SD患者10例和正常青少年30例。所有研究对象均行双能X线吸收仪测量非优势侧的股骨近端和腰椎(L2~4)的骨密度(bone mineral density,BMD),将2组受试者的测量结果进行t检验比较,并对SD组BMD结果与后凸Cobb角角度进行相关性分析。结果 2组受试者在年龄、性别比例、体重指数(body mass index,BMI)、腰椎及非优势侧股骨近端BMD上差异无统计学意义(P〉0.05),SD组患者腰椎及非优势侧股骨近端BMD与后凸Cobb角角度无显著相关性(P〉0.05)。结论骨质疏松可能不是青少年发生SD的致病因素,骨质疏松与SD的严重程度可能无关。  相似文献   

8.
目的:观察青少年特发性脊柱侧凸(AIS)结构性腰弯患者腰椎关节突关节角角度与正常腰椎关节突关节角角度的差异,探讨AIS患者后期出现腰背痛和腰椎退行性疾病高发的可能原因.方法:结构性腰弯的AIS患者21例(AIS组),非脊柱畸形的青少年20例(对照组).AIS组中男3例,女18例,年龄12~17岁,平均14.4岁,腰弯Cobb角38°~115°,平均54.2°.对照组男8例,女12例,年龄10~19岁,平均为15.2岁.均采用螺旋CT连续扫描T12~S1.通过PACS Client软件测量所有受试者腰椎关节突关节角和结构性腰弯AIS患者腰椎RAsag角.将对照组左、右侧腰椎关节突关节角角度进行配对t检验:对AIS组患者凹侧、凸侧的腰椎关节突关节角角度进行配对t检验.并对凹侧与凸侧腰椎关节突关节角角度差和Cobb角、相应节段腰椎的RAsag角进行相关性分析.结果:对照组双侧腰椎关节突关节角角度在所有节段未见显著性差异(P>0.05).AIS组所有节段凹侧的腰椎关节突关节角角度明显大于凸侧(P<0.05);凹侧和凸侧的腰椎关节突关节角角度差与Cobb角、相应节段腰椎的RAsag角没有显著相关性(p>0.05).结论:结构性腰弯的AIS患者凹侧的腰椎关节突关节角度明显大于凸侧,这可能是该类患者后期凹侧腰椎关节突关节更易发生退行性病变的因素之一.  相似文献   

9.
[目的]调查哈尔滨市青少年脊柱侧凸的患病率及类型,分析支具治疗的临床效果。[方法]于2005年10月~2009年10月对哈尔滨市城乡32所中、小学校6~16岁的24 362名中、小学生进行脊柱侧凸普查,统计患病率情况。根据特发性脊柱侧凸患者Cobb角大小不同,给予热塑支具治疗(Cobb角20°~40°)。每6个月复查1次,摄站立位全脊柱正侧位X线片,分析治疗结果。[结果]第一检结果阳性1 240名(5.09%),第二检阳性518名(2.13%),其中497名进行第三检,全脊柱正侧位X线片示Cobb角≥10°者423名,患病率为1.74%。特发性脊柱侧凸116例(Cobb角20°~40°)进行热塑支具治疗,支具治疗病例平均随访38个月,84例(72.4%)治疗有效,32例(27.6%)出现脊柱侧凸进展,治疗无效。Cobb角20°~30°组的矫正效果优于Cobb角30°~40°组,两组比较有显著差异(P<0.05)。[结论]通过普查,可以早发现、早诊断青少年脊柱侧凸,以便及时选择适当的方法进行治疗。热塑矫形支具治疗青少年特发性脊柱侧凸能够取得较好疗效,侧凸柔软性好,Cobb角较小,则矫正效果好。  相似文献   

10.
目的:分析术前支具治疗对女性青少年特发性脊柱侧凸(AIS)患者手术矫形效果的影响。方法 :筛选2001年7月~2009年12月在我院接受单一后路矫形内固定手术治疗的女性青少年特发性主胸弯脊柱侧凸患者70例,其中术前接受支具治疗组(A组)26例;未接受支具治疗组(B组)44例。两组发现畸形年龄、术时年龄、术前主胸弯冠状面Cobb角、凸侧Bending像Cobb角、侧凸柔韧性、手术融合椎体数比较均无统计学差异(P>0.05),A、B组随访时间超过1年者分别为23例和34例,随访时间分别为12~101个月(平均37.7个月)、12~87个月(平均28.7个月),两组比较无统计学差异(P>0.05)。比较两组患者的手术矫形效果。结果:A组与B组患者术前主胸弯冠状面Cobb角分别为52.8°±8.3°和54.0°±10.7°,术后分别矫正到12.3°±7.3°和11.5°±8.1°,术后较术前均明显改善(P<0.01),主胸弯矫形率分别为(77.0±12.6)%和(79.3±11.9)%,两组比较无统计学差异(P>0.05);末次随访时主胸弯冠状面Cobb角分别为16.7°±8.4°和15.4°±7.2°,两组比较无统计学差异(P>0.05),主胸弯矫形率分别为(68.8±14.5)%和(70.5±13.0)%,两组比较无统计学差异(P>0.05)。A、B组患者术前主胸弯顶椎偏距分别为41.4±14.3mm和36.8±13.7mm,两组比较无统计学差异(P>0.05),术后分别被矫正到10.4±5.4mm和7.2±5.6mm,B组优于A组(P<0.05);末次随访时分别为14.4±11.3mm和12.1±8.5mm,两组比较无统计学差异(P>0.05)。A、B组患者术前、术后、末次随访时冠状面失平衡的发生比例分别为15.4%(4/26)和9.1%(4/44),15.4%(4/26)和15.9%(7/44),4.3%(1/23)和8.8%(3/34),两组比较均无统计学差异(P>0.05)。A、B组患者术前主胸弯矢状面Cobb角分别为12.9°±11.1°和18.7°±11.3°,A组胸后凸更小(P<0.05),术后主胸弯矢状面Cobb角分别被矫正到18.0°±6.3°和22.3°±7.8°,矫正度分别为5.0°±9.8°和3.6°±12.6°,两组矫正度比较无统计学差异(P>0.05);末次随访时A、B组患者主胸弯矢状面Cobb角分别为20.0°±6.7°和22.4°±7.7°,两组比较无统计学差异(P>0.05)。结论:术前支具治疗对女性青少年特发性主胸弯脊柱侧凸患者手术矫形效果未产生明显影响。  相似文献   

11.
Background : We investigated the vasopressor hormone response following mesenteric traction (MT) with hypotension due to prostacyclin (PGI2) release in patients undergoing abdominal surgery with a combined general and epidural anesthesia. Methods : In a prospective, randomized, placebo-controlled study we administered 400 mg ibuprofen (i.v.) in 42 patients scheduled for abdominal surgery. General anesthesia was combined with epidural anesthesia (T4-L1). Before as well as 5, 15, 30, 45, and 90 min after MT we recorded plasma osmolality, hemodynamics and measured 6-keto-PGFlα (stabile metabolite of PGI2), TXB2 (stabile metabolite of thromboxane A2) active renin, and arginine vasopressin (AVP) plasma concentrations by radioimmunoassay. Catecholamine levels were assessed by high-pressure liquid chromatography (HPLC) with electrochemical detection. Results : Following MT, arterial hypotension occurred along with a substantial PGI2 release. This was completely abolished by ibuprofen administration. Although plasma levels of 6-keto-PGF (1133 (708) vs. 60 (3) ng/L, median (median absolute deviation), P=0.0001, placebo vs. ibuprofen) remained significantly elevated, blood pressure was restored within 30 min after MT in the placebo group. At the same point in time plasma concentrations of TXB2 (164 (87) vs. 58 (1) ng/L, P=0.0001), epinephrine (46 (33) vs. 14 (6) ng/L, P=0.001), AVP (41 ± (18) vs. 12 (7) ng/L, P=0.0004), and active renin (27 (12) vs. 12 (4) ng/L, P = 0.001) were significantly higher in placebo-treated patients. Conclusion : Under combined general and epidural anesthesia arterial hypotension following MT due to endogenous PGI2 release is associated with enhanced release of AVP, active renin, epinephrine and thromboxane A2, presumably contributing to hemodynamic stability within 30 min after MT.  相似文献   

12.
Don Dame 《Artificial organs》1996,20(5):613-617
Abstract: Virtually all blood pumps contain some kind of rubbing, sliding, closely moving machinery surfaces that are exposed to the blood being pumped. These valves, internal bearings, magnetic bearing position sensors, and shaft seals cause most of the problems with blood pumps. The original teaspoon pump design prevented the rubbing, sliding machinery surfaces from contacting the blood. However, the hydraulic efficiency was low because the blood was able to "slip around" the rotating impeller so that the blood itself never rotated fast enough to develop adequate pressure. An improved teaspoon blood pump has been designed and tested and has shown acceptable hydraulic performance and low hemolysis potential. The new pump uses a nonrotating "swinging" hose as the pump impeller. The fluid enters the pump through the center of the swinging hose; therefore, there can be no fluid slip between the revolving blood and the revolving impeller. The new pump uses an impeller that is comparable to a flexible garden hose. If the free end of the hose were swung around in a circle like half of a jump rope, the fluid inside the hose would rotate and develop pressure even though the hose impeller itself did not "rotate"; therefore, no rotating shaft seal or internal bearings are required.  相似文献   

13.
Background : Our objective was to determine whether administration of propranolol or verapamil modifies the hemodynamic adaptation to continuous positive-pressure ventilation (CPPV), in particular the regional distribution of cardiac output (CO).
Methods : General hemodynamics and regional blood flows assessed by microsphere technique (15 (μm) were recorded in 16 anesthetized pigs during spontaneous breathing (SB) and CPPV with 8 cm H2O end-expiratory pressure (CPPV8) before and after intravenous administration of propranolol (0.3 mg · kg−1 followed by 0.15 mg · kg−1 · h−1, n=8) or verapamil (0.1 mg · kg−1 followed by 0.3 mg · kg−1 · h−1, n=8).
Results : CPPV8 depressed CO by 25% without shifts in its relative distribution with the exception of a noteworthy increase in adrenal perfusion. Propranolol increased arterial blood pressure, and due to a fall in heart rate, CO dropped by 25%. The kidneys and, to a lesser extent, the splanchic region and central nervous system received increased fractions of the remaining CO at the expense of skeletal muscle flow. Similar patterns were seen during SB and CPPV8 such that the combination of propranolol and CPPV8 depressed CO by 50%. The circulatory effects of verapamil were less evident but myocardial perfusion tended to increase.
Conclusions : The combination of propranolol or verapamil with CPPV does not result in any specific hemodynamic interaction in anesthetized pigs, except that the combined effect of propranolol and CPPV may severely reduce CO.  相似文献   

14.
Background : Inhibitory effects of volatile anaesthetics on platelet aggregation have been demonstrated in several studies. However, the influence of volatile anaesthetics on intracoronary platelet adhesion has not been elucidated so far.
Methods : Isolated hearts of guinea pigs were perfused with buffer in the absence or presence of volatile anaesthetics (0.5 and 1 MAC) at constant coronary flow rates of 5 ml/min for 25 min, then 1 ml/min for 30 min and again 5 ml/min for 10 min. Before, during and after low-flow perfusion, a bolus of human platelets was applied into the coronary system. To simulate thrombogenic conditions, 0.3 U/ml human thrombin was infused during low-flow perfusion and reperfusion. The number of platelets sequestered to the endothelium was calculated from the difference between coronary in- and output of platelets. The myocardial production of lactate and consumption of pyruvate and coronary perfusion pressure were also determined.
Results : At a flow rate of 5 ml/min only about 3% of the applied platelets did not emerge from the coronary system, in any group. In contrast, 13.1±1.2% (mean±SEM) of infused platelets became adherent in low-flow perfusion in the control group without anaesthetic. The adherence was reduced with each 1 MAC isoflurane (to 6.2±1.2%), sevoflurane (to 4.4±0.9%) or halothane (to 3.2±1.5%) (each P <0.05 vs. control). Volatile anaesthetic, 0.5 MAC, did not inhibit platelet adhesion to a statistically significant extent in any case. Perfusion pressure and metabolic parameters were not statistically different between the control and the hearts exposed to anaesthetics.
Conclusion : Volatile anaesthetics in a concentration of 1 MAC can reduce the adhesion of platelets in the coronary system under reduced flow conditions. This action does not arise from vasodilation or inhibition of ischaemic stress.  相似文献   

15.
Abstract: A variety of protein-bound or hydrophobic substances, accumulating as a result of pathologic conditions such as exogenous or endogenous intoxications, are removed poorly by conventional detoxification methods because of low accessibility (hemodialysis), insufficient adsorption capabilities (hemosorption), low efficiency (peritoneal dialysis), or economic limitations (high-volume plasmapheresis). Combining advantages of existing methods with microspheric technology, a module-based system was designed. Major operating parameters of the latter can be modified to allow for adjustment to individual clinical situations. An extracorporeal blood circuit including a plasmafilter is combined with a secondary high-velocity plasma circuit driven by a centrifugal pump. Different microspheric adsorbers can be combined in one circuit or applied in sequence. Thus, a prolonged treatment can be tailored using specially designed selective adsorber materials. Comparing this system with existing methods (high-flux hemodialysis, molecular adsorbent recycling system), results from our in vitro studies and animal experiments demonstrate the superior efficiency of substance removal.  相似文献   

16.
Background: Halothane inhibits in vitro and in vivo activity of cytochrome P-450 (CYP) 2E1. There are several fluorinated volatile anaesthetics besides halothane, and most of them are defluorinated by CYP2E1. It is unclear whether other fluorinated anaesthetics inhibit the in vivo activity of CYP2E1.
Methods: We compared the inhibitory effects of therapeutic concentrations of four inhalational anaesthetics, halothane, enflurane, isoflurane, and sevoflurane, on chlorzoxazone metabolism in rabbits receiving artificial ventilation.
Results: All four inhalational anaesthetics decreased arterial blood pressure and increased plasma chlorzoxazone concentration. However, no significant differences in the plasma chlorzoxazone concentration were found between the four anaesthetics. The estimated chlorzoxazone clearance increased after beginning inhalation with all four agents, but no significant difference in clearance was noted between agents.
Conclusions: At therapeutic concentrations, the in vivo inhibitory effect on chlorzoxazone metabolism was similar for all four inhalational anaesthetics examined, even though their chemical characteristics and extent of hepatic metabolism differ considerably.  相似文献   

17.
Abstract Immunoadsorption (1A) therapy with tryptophan (TR-350) or phenylalanine (PH-350) adsorbents has been used to reduce the concentration of serum antibodies in human lymphocyte antigen (HLA)-immunized patients. Other forms of plasma purification have been reported to reduce the level of fibrinogen, which affects the blood properties. In this study we investigated the effects of IA therapy using both adsorbents on plasma fibrinogen and immunoglobulins G and M in 13 patients (8 patients were treated with TR-350, and 5 patients were treated with PH-350). During each session 1 plasma volume (2.8 ± 0.4 L of plasma) was processed through the immunocolumn and then returned to the patient together with the blood cells. Compared with the pretreatment values, the plasma fibrinogen, IgG, and IgM concentrations were significantly reduced after IA therapy (p < 0.01 for TR-350; p < 0.04 for PH-350). There was a positive correlation between the degree of reduction of plasma proteins and the number of IA treatments given. A nonpara-metric test (Wilcoxon's signed-rank test or the Mann-Whitney test) was used for statistical analysis. We conclude from our study that IA therapy effectively lowers the plasma levels of fibrinogen, IgG, and IgM and thus can be considered a valuable alternative to other blood purification methods.  相似文献   

18.
Background: Obesity is increasing globallly, including in the formerly "Eastern Bloc" countries. Methods: A survey was made of obesity and bariatric surgery. Results: In the 8 East and Central European countries studied, with total population 300 million, roughly 43% of the population was overweight (BMI 25-30), 23% obese (BMI > 30), with about 15 million people morbidly obese (BMI > 40). From 0-10 morbidly obese individuals/100,000/year undergo bariatric surgery. Conclusion: Most countries were found to provide inadequate treatment for obesity.The majority of the morbidly obese are not treated effectively. However, health-care awareness of obesity and bariatric surgeons are slowly increasing.  相似文献   

19.
20.
Abstract: Photopheresis is a technique in which peripheral blood mononuclear cells, in the presence of a photoacti-vatable compound, are exposed extracorporeally to ultraviolet A light and reinfused, inducing a host autoregula-tory immune response. Experimental work and ongoing clinical studies are helping to define the role of this novel, safe, and non-toxic immunomodulating technology in the field of transplantation.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号