Mitek可吸收钉固定自体四股胭绳肌肌腱重建前交叉韧带21例

目的介绍关节镜下自体半腱肌，股薄肌移植重建前交叉韧带并利用Mitek可吸收钉固定的手术方法，观察其近期临床疗效。方法利用Mitek可吸收钉固定自体腘绳肌肌腱重建前交叉韧带21例。于术后3、6、12个月随访，分别进行Lysholm功能评分和SF-36自我评分，以及Lachman和KT-2000客观体征评价，部分患者行MRI检查。结果21例全部获得随访，Lysholm功能评分和SF-36评分较术前明显提高。2例Lachman征阳性，轴移试验均为阴性，KT-2000测试结果2例双侧差距超过5mm。结论自体四股腘绳肌移植重建前交叉韧带可获得满意的临床效果，Mitek可吸收钉固定可提供良好的初始稳定，无排异反应，对MRI检查无影响。     

关节镜下应用EndoPearl与Intrafix固定双侧绳肌肌腱一期重建膝关节前后交叉韧带

目的探讨关节镜下应用EndoPearl与Intrafix固定双侧腘绳肌肌腱同时重建膝关节前后交叉韧带的近期临床效果。方法对2004年6月~2005年3月收治的10例膝关节前后交叉韧带同时断裂的患者,切取双侧腘绳肌腱,2条半腱肌腱和2条股薄肌腱分别对折成四束,折端固定同直径EndoPearl。关节镜下利用两组移植物同时分别重建膝前后交叉韧带。股骨端应用可吸收界面螺钉顶压固定EndoPearl与移植肌腱,胫骨端应用Intrafix固定四束肌腱。结果10例均获得随访,平均7.5个月(6~15个月),切口Ⅰ期愈合,无感染。其中新鲜损伤4例,陈旧性损伤6例,合并后外侧复合体损伤3例,均予同期修复,合并内侧副韧损伤6例,未予特殊处理,5例曾急诊修复腘动静脉。术后3个月膝关节活动范围均超过120°,无伸膝受限,后抽屉试验Ⅰ度阳性2例,其余为阴性;Lyshlom评分(92.6±3.2)分。结论关节镜下应用EndoPearl与Intrafix固定双侧腘绳肌肌腱同时重建膝关节前后交叉韧带方法确切,可有效恢复膝关节功能。     

Rigidfix与Intrafix螺钉在前交叉韧带重建中的应用

目的探讨关节镜下应用可吸收Rigidfix横穿钉与Intrafix膨胀挤压螺钉固定4股单束自体腘绳肌腱,重建前交叉韧带(anterior cruciate ligament,ACL)的手术方法和临床疗效。方法 2009年7月至2012年7月芜湖市中医院关节二科共诊治45例ACL损伤患者,取自体腘绳肌腱4股单束在关节镜下使用Intrafix膨胀挤压螺钉固定胫骨端,Rigidfix横穿钉固定股骨端,重建ACL。观察术后膝关节的稳定性及疗效。结果本组45例患者术后均得到随访,随访12~48个月,平均32个月。关节功能良好,Lysholm评分术前(42.30±4.20)分,术后12个月(92.54±2.10)分,术后评分明显提高,差异有统计学意义(P0.01)。结论关节镜下使用可吸收Rigidfix横穿钉与Intrafix膨胀挤压螺钉固定4股单束自体腘绳肌腱重建ACL,疗效肯定,操作简单,能够提供早期的初始稳定性和后期的生物稳定性,适宜基层医院临床应用推广。     

关节镜下应用EndoPearl与Intrafix固定双侧腘绳肌肌腱一期重建膝关节前后交叉韧带

目的 探讨关节镜下应用EndoPearl与Intrafix固定双侧腘绳肌肌腱同时重建膝关节前后交叉韧带的近期临床效果.方法 对2004年6月～2005年3月收治的10例膝关节前后交叉韧带同时断裂的患者,切取双侧腘绳肌腱,2条半腱肌腱和2条股薄肌腱分别对折成四束,折端固定同直径EndoPearl.关节镜下利用两组移植物同时分别重建膝前后交叉韧带.股骨端应用可吸收界面螺钉顶压固定EndoPearl与移植肌腱,胫骨端应用Intrafix固定四束肌腱.结果 10例均获得随访,平均7.5个月(6～15个月),切口Ⅰ期愈合,无感染.其中新鲜损伤4例,陈旧性损伤6例,合并后外侧复合体损伤3例,均予同期修复,合并内侧副韧损伤6例,未予特殊处理,5例曾急诊修复腘动静脉.术后3个月膝关节活动范围均超过120°,无伸膝受限,后抽屉试验Ⅰ度阳性2例,其余为阴性;Lyshlom评分(92.6±3.2)分.结论 关节镜下应用EndoPearl与Intrafix固定双侧腘绳肌肌腱同时重建膝关节前后交叉韧带方法确切,可有效恢复膝关节功能.     

关节镜下应用钮扣式钢板固定四股自体股腘绳肌腱重建前交叉韧带

目的 探讨关节镜下应用钮扣式钢板固定四股自体腘绳肌腱重建膝关节前交叉韧带（anterior cruciate ligament,ACL）的临床疗效. 方法 对32例前交叉韧带损伤者在关节镜下应用钮扣式钢板固定四股腘绳肌腱重建术.术前和术后进行Lachman试验、轴移试验评估膝关节的稳定性,用Lysholm评分法评价膝关节功能.术前常规行MRI及膝关节正侧位、髌骨轴位X线片检查,排除前交叉韧带起止点骨性撕脱. 结果 32例随访3.5～29个月,其中25例＞12个月.所有病例膝关节不稳定感明显改善.术前Lachman试验阳性32例,轴移试验阳性28例.Lysholm综合评分51.8±5.6.术后Lachman试验30例阴性,2例弱阳性,轴移试验均为阴性,膝关节功能Lysholm综合评分为90.7±2.5.3例关节积液,经关节穿刺抽吸后吸收. 结论 关节镜下应用钮扣式钢板固定四股自体腘绳肌腱重建膝ACL的近期临床疗效良好.     

关节镜下自体腘绳肌腱重建膝关节前交叉韧带

目的：探讨关节镜下自体4股腘绳肌腱、生物可吸收挤压螺钉固定重建前交叉韧带（ACL）的临床效果。方法：31例经关节镜检查证实为前交叉韧带断裂的患者，男27例，女4例；年龄17～40岁，平均25岁。其中合并半月板损伤26例，合并局部软骨损伤3例，软骨Ⅰ～Ⅱ度退变16例。均于关节镜下行自体4股腘绳肌腱和软组织生物可吸收挤压固定螺钉重建ACL。术后对膝关节功能进行评定。结果：31例术后均未发生关节感染、血管神经损伤等严重并发症。30例获得随访，时间9-39个月，平均（19±9．0）个月，Lysholm膝关节功能评分从术前平均（54．6±16．6）分提高至随访时平均（92．5±5．7）分，较术前显著改善（t=11．84，P〈0．01）。30例患者中，26例恢复伤前运动水平，2例运动水平较伤前降低，2例因运动后出现关节酸痛而不敢剧烈运动。结论：关节镜下采用4股腘绳肌腱作移植物，生物可吸收挤压螺钉固定，是重建ACL的一种安全可靠的治疗方法。具有手术创伤少、术后膝关节功能恢复良好的优点。     

Mitek可吸收钉固定自体四股腘绳肌肌腱重建前交叉韧带21例

目的介绍关节镜下自体半腱肌,股薄肌移植重建前交叉韧带并利用Mitek可吸收钉固定的手术方法,观察其近期临床疗效。方法利用Mitek可吸收钉固定自体腘绳肌肌腱重建前交叉韧带21例。于术后3、6、12个月随访,分别进行Lyshol m功能评分和SF-36自我评分,以及Lachman和KT-2000客观体征评价,部分患者行MRI检查。结果21例全部获得随访,Lyshol m功能评分和SF-36评分较术前明显提高。2例Lachman征阳性,轴移试验均为阴性,KT-2000测试结果2例双侧差距超过5 mm。结论自体四股腘绳肌移植重建前交叉韧带可获得满意的临床效果,Mitek可吸收钉固定可提供良好的初始稳定,无排异反应,对MRI检查无影响。     

关节镜下采用四股和八股腘绳肌肌腱双束重建前十字韧带的比较研究

目的比较关节镜下采用四股和八股腘绳肌肌腱双束重建前十字韧带的临床效果。方法2001年9月至2002年8月,将76例陈旧性前十字韧带损伤患者随机分为两组进行双束重建。一组采用四股腘绳肌肌腱移植物:取同侧半腱肌肌腱,做成两个两股肌腱移植物,分别重建前十字韧带前、后束;一组采用八股腘绳肌肌腱移植物:取同侧半腱肌肌腱做成一个四股肌腱移植物重建前束,取同侧股薄肌肌腱做成另一个四股肌腱移植物重建后束。按照IKDC、Lysholm和Tegner膝关节评分标准评价疗效。结果四股肌腱移植物组有33例、八股肌腱移植物组有35例获得随访,随访时间1～3年,平均16个月。四股肌腱移植物组KT-1000检查示,双侧膝关节前向松弛度差异<3mm者25例(75.8%,25/33),3～5mm者5例(15.2%,5/33),6～10mm者3例(9.1%,3/33);轴移试验阴性28例(84.8%),阳性5例(15.2%)。八股肌腱移植物组KT-1000检查示,双侧膝关节前向松弛度差异<3mm者33例(94.3%,33/35),3～5mm者2例(5.7%,2/35);轴移试验阴性34例(97.1%),阳性1例(2.9%)。根据IKDC检查标准,四股肌腱移植物组有29例(87.9%,29/33)、八股肌腱移植物组有34例(97.1%,34/35)为正常或者接近正常,Lysholm评分分别为(90.2±2.9)分和(97.3±1.7)分,两组比较差异有统计学意义(P<0.05)。结论关节镜下采用八股腘绳肌肌腱较采用四股腘绳肌肌腱双束重建前十字韧带能够明显提高膝关节稳定性。     

三明治式后交叉韧带重建的初期临床结果

目的介绍三明治式后交叉韧带重建的方式，总结其初期临床结果。方法对18例陈旧性后交叉韧带断裂的患者在关节镜下采用8股胭绳肌肌腱、以保留后交叉韧带残留纤维的方式进行4隧道双束重建（三明治式后交叉韧带重建）。采用4股半腱肌肌腱重建前外侧束（主束），采用4股股薄肌肌腱重建后内侧束（副束）。移植物两端采用微型钢板纽扣进行悬吊式固定。随后对患者进行1年以上的随访。结果术前所有患者后抽屉试验阳性。术后1年，17位患者后抽屉试验阴性，KT-1000检查（屈膝90&#176;，30磅）双侧松弛度差异小于3mm。1位患者后抽屉试验1度阳性，KT-1000检查（屈膝90&#176;，30磅）双侧松弛度差异为4mm。根据IKDC评分标准，15位患者为正常，3为患者为接近正常。按照IKDC膝关节主观评分标准，结果从术前的64．1&#177;3．3改善至最近随访的93．5&#177;2．9（P〈0．01）。Lysholm评分从58．6&#177;4．4改善至94．3&#177;3．8（P〈0．01）。受伤前、术前和最近随访，Tegner评分分别为7．1，5．6和6．8。结论关节镜下采用8股胭绳肌肌腱以保留后交叉韧带残留纤维的方式进行4隧道双束重建能够可靠地恢复膝关节的稳定性。     

自体与同种异体腘绳肌腱重建前交叉韧带的疗效比较

目的 比较关节镜下保留残端自体腘绳肌腱与同种异体腘绳肌腱重建前交叉韧带的疗效。方法 将45例前交叉韧带损伤患者按照治疗方法不同分为观察组(采用关节镜下保留残端自体腘绳肌腱重建治疗，25例)和对照组(采用关节镜下保留残端同种异体腘绳肌腱重建治疗，20例)。比较两组膝关节稳定性、术后并发症发生率、膝关节功能及膝关节活动度。结果 患者均获得随访，时间12～14个月。术后12个月MRI检查显示两组均腱骨愈合。KT-2000关节测量仪测量的两组双侧移动差值：术后3个月比较差异无统计学意义(P>0.05),术后6、12个月观察组均小于对照组(P<0.05)。末次随访时，两组Lachman试验均为阴性。两组术后并发症发生率比较差异无统计学意义(P>0.05)。术后3、12个月Lysholm评分观察组均高于对照组(P<0.05)。末次随访时，两组膝关节伸直、屈曲活动度比较差异均无统计学意义(P>0.05)。结论 与同种异体腘绳肌腱相比，关节镜下保留残端自体腘绳肌腱重建前交叉韧带有利于膝关节功能的恢复，且稳定性好。     

Vasopressor hormone response following mesenteric traction during major abdominal surgery

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_1α (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.     

A Teaspoon Pump for Pumping Blood with High Hydraulic Efficiency and Low Hemolysis Potential

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.     

Microspheres Based Detoxification System: A New Method in Convective Blood Purification

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.     

Tissue perfusion in relation to cardiac output during continuous positive-pressure ventilation and administration of propranolol or verapamil

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.     

Bariatric Surgery in Some "Central and East-European (former Eastern bloc)"Countries - Current Status and Prediction for the Next Millennium

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.     

Volatile anaesthetics reduce adhesion of blood platelets under low-flow conditions in the coronary system of isolated guinea pig hearts

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.     

Synergistic interaction between the effects of propofol and midazolam with fentanyl on phrenic nerve activity in rabbits

Background: It has been shown that the depressive effects of both propofol and midazolam on consciousness are synergistic with opioids, but the nature of their interactions on other physiological systems, e. g. respiration, has not been fully investigated. The present study examined the effect of propofol and midazolam alone and in combination with fentanyl on phrenic nerve activity (PNA) and whether such interactions are additive or synergistic. Methods: PNA was recorded in 27 anaesthetised and artificially ventilated rabbits. In three groups, propofol, fentanyl and midazolam were administered intravenously in incremental doses to construct dose-response curves for the depressant effects of each one on PNA. In another two groups, the effect of pretreatment with either fentanyl 1 μg · kg^?1 i. v. or midazolam 0.05 mg · kg^?1 i. v. on the effects of propofol and fentanyl respectively on PNA were studied. Results: Propofol and fentanyl caused a dose-dependent depression of PNA with complete abolition at the highest total doses of 16 mg · kg^?1 i. v. and 32 μg · kg^?1 i. v., respectively. In contrast, midazolam in incremental doses to a total of 0.8 mg · kg^?1 reduced mean PNA by 63%, but approximately 12% of PNA remained at a total dose as high as 6.4 mg · kg^?1. The mean ED₅₀s, calculated from dose-response curves, were 5.4 mg · kg^?1, 3.9 μg · kg^?1 and 0.4 mg · kg^?1 for propofol, fentanyl and midazolam, respectively. Initial doses of either fentanyl 1 μg · kg^?1 i. v. or midazolam 0.05 mg · kg^?1 i. v. acted synergistically with subsequent doses of either propofol or fentanyl to abolish PNA at total doses of 8 mg · kg^?1 and 8 μg · kg^?1, respectively. Conclusion: Fentanyl has a synergistic interaction with both propofol and midazolam on PNA and hence potentially on respiration.     

Influence of dopexamine hydrochloride on haemodynamics and regulators of circulation in patients undergoing major abdominal surgery

Background: Catecholaminergic support is often used to improve haemodynamics in patients undergoing major abdominal surgery. Dopexamine is a synthetic vasoactive catecholamine with beneficial microcirculatory properties. Methods: The influence of perioperative administration of dopexamine on cardiorespiratory data and important regulators of macro- and microcirculation were studied in 30 patients undergoing Whipple pancreaticduodenectomy. The patients received randomized and blinded either 2 μg · kg^?1 · min^?1 of dopexamine (n=15) or placebo (n=15, control group). The infusion was started after induction of anaesthesia and continued until the morning of the first postoperative day. Endothelin-1 (ET-1), vasopressin, atrial natriuretic peptide (ANP), and catecholamine plasma levels were measured from arterial blood samples. Measurements were carried out after induction of anaesthesia, 2 h after onset of surgery, at the end of surgery, 2 h after surgery, and on the morning of the first postoperative day. Results: Cardiac index (CI) increased significantly in the dopexamine group (from 2.61±0.41 to 4.57±0.78 1 · min^?1 · m^?2) and remained elevated until the morning of the first postoperative day. Oxygen delivery index (DO₂I) and oxygen consumption index (VO₂I) were also significantly increased in the dopexamine group (DO₂I: from 416±91 to 717±110 ml/m² · m²; VO₂I: from 98±25 to 157±22 ml/m² · m²), being significantly higher than in the control group. pHi remained stable only in the dopexamine patients, indicating adequate splanchnic perfusion. Vasopressive regulators of circulation increased significantly only in the untreated control patients (vasopressin: from 4.37±1.1 to 35.9±12.1 pg/ml; ET-1: from 2.88±0.91 to 6.91±1.20 pg/ml). Conclusion: Patients undergoing major abdominal surgery may profit from prophylactic perioperative administration of dopexamine hydrochloride in the form of improved haemodynamics and oxygenation as well as beneficial influence on important regulators of organ blood flow.     

Systemic analgesia adapted to the children's condition

A concept of balanced analgesia using nonsteroidal anti-inflammatory drugs (NSAIDs), paracetamol (acetaminophen), opioids, and corticosteroids can also be used in patients with pre-existing illnesses. NSAIDs are the most effective treatment for acute pain of moderate intensity in children; however, these drugs should be avoided in patients at increased risk for serious side effects, e.g. patients with renal impairment, bleeding tendency, or extreme prematurity. NSAIDs can be given with minimal risks to the younger child with mild to moderate asthma, and, in these patients, the use of steroids can be encouraged; in addition to their antiemetic and analgesic action, a beneficial effect on asthma symptoms can be expected. In the non-intubated child with cerebral trauma, exaggerated sedation caused by opioids and increased bleeding tendency caused by NSAIDs must be avoided. In neonates and small infants, the oral administration of sucrose or glucose is helpful to minimize pain reaction during short uncomfortable interventions.     

A comparison of the inhibitory effects of four volatile anaesthetics on the metabolism of chlorzoxazone, a substrate for CYP2E1, in rabbits

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.