血管内电凝瓣膜修复治疗下肢深静脉瓣膜功能不全的手术探讨

目的探讨股部小切口修复静脉瓣膜、血管内电凝曲张静脉治疗原发性下肢深静脉瓣膜功能不全的微创手术方法。方法选择67例原发性下肢深静脉瓣膜功能不全的病人,在硬膜外麻醉或腰麻下取股部小切口,行第一对股浅静脉瓣膜外修复,同时利用40 W手术电刀对迂曲扩张的浅静脉进行血管内电凝。总结手术入路和手术体会。结果患者术后7 d拆线,股部小切口愈合良好,下肢曲张浅静脉消失,无淋巴漏等并发症发生;随访1~5年,超声多普勒检查电凝后的大隐静脉和曲张浅静脉均已闭合,无曲张静脉复发现象,但有2例瓣膜修复处术后3年有轻度返流。结论股部小切口修复瓣膜结合血管内电凝曲张静脉,是一种较好的治疗下肢深静脉瓣膜功能不全的微创手术方法,操作简便、创伤小、恢复快、并发症少,值得推广应用。     

中西医结合微创治疗下肢深静脉瓣膜功能不全

目的:总结中西医结合微创治疗下肢深静脉瓣膜功能不全的临床治疗体会.方法:选择213例病人,在硬膜外麻醉下取股部小切口,行第1对股浅静脉瓣膜外修复.选用810 nm的半导体激光器,对迂曲扩张的大隐静脉进行血管内光凝术,并用中药消痔灵曲张静脉局部注射.结果:术后当天即可下床,无并发症,随访6月～3年,临床治愈率97.65%,深静脉瓣膜外修复处除5例出现轻度返流外,余均无静脉返流,闭塞静脉无复发.结论:中西医结合微创治疗下肢深静脉瓣膜功能不全操作简便、创伤小、美观、恢复快.     

股浅静脉戴戒术术中彩色多普勒超声的应用体会

目的 研究术中彩色多普勒超声指导股浅静脉戴戒术治疗原发性深静脉瓣膜功能不全疗效。方法 对原发性下肢深静脉瓣膜功能不全的患者63例69条肢体采用股浅静脉戴戒术，术中应用彩色多普勒超声测量静脉返流，瓣环扩大及判定瓣膜的功能．指导最佳环缩位置及程度，并于术中判断瓣环及瓣膜修复情况。结果 全组病例均于术中证实，瓣环环缩适当，瓣膜开闭良好，静脉返流完全控制。结论 术中彩色多普勒超声的应用使股浅静脉戴戒术更精确有效，避免了盲目环缩的位置不当、环缩程度不够、返流控制不完善等弊端。     

血管镜直视下Guo静脉壁外瓣膜修复成形术

作者利用血管镜直视诊断和直视监控手术操作的先进性能，首次设计并经２０例初步临床应用，表明血管直视下Ｇｕｏ静脉壁外瓣修复成形术的主要适应症是股浅静脉瓣缺乏而Ｇｕｏ静脉具备修复成形术的组织基础，血管可以直视确诊瓣膜功能不全的程度，直视诊察瓣膜的形态结构，为瓣膜修复成形术提供了可靠的依据；避免了切开静脉壁和瓣膜损伤，减少了术后血栓形成的机率。     

血管镜直视下腘静脉壁外瓣膜修复成形术

作者利用血管镜直视诊断和直视监控手术操作的先进性能，首次设计并经２０例初步临床应用，表明血管镜直视下静脉壁外瓣膜修复成形术的主要适应症是股浅静脉瓣缺乏而静脉瓣具备修复成形术的组织基础。血管镜可以直视确诊瓣膜功能不全的程度，直视诊察瓣膜的形态结构，为瓣膜修复成形术提供了可靠的依据；避免了切开静脉壁和瓣膜损伤，减少了术后血栓形成的机率。     

鼻咽镜下股浅静脉瓣膜修复成形术

原发性股浅静脉瓣膜功能不全是下肢静脉倒流性疾病的重要原因之一 ,其病变部位主要集中在股浅静脉瓣膜区。特征有 :瓣环扩张、瓣叶游离缘松弛、瓣叶不能在血管腔正中紧密对合并有效制止血液倒流[1] 。针对这一特点 ,我们用自制的“血管镜”即 :纤维鼻咽镜 腹腔镜监视系统 ,实施了直视下股浅静脉瓣膜修复成形术 ,初步观察效果良好。资料与方法1.一般资料 :1999年 6月至 2 0 0 0年 5月 ,实施鼻咽镜下股浅静脉瓣膜探查术 15例 ,其中男性 9例 ,女性 6例 ,年龄36～ 6 0岁。除 2例瓣膜情况较差外 ,13例行股浅静脉瓣膜壁外修复成形术。术前均诊断…     

血管镜直视下股浅静脉壁外瓣膜修复成形术

作者首次设计并实行了血管镜直视下股浅静脉壁外瓣膜修复成形术，该手术的适应证主要为瓣膜先发育完善，但受致病因素作用瓣叶发生皱褶脱垂，瓣叶间出现不规划裂隙，瓣证存在不同程度的扩张。该手术主要针对股浅静脉浅静脉第一对瓣膜功能不全而设计，但也可尝试应用于脉瓣膜的修复成形，并可应用于多可瓣膜的修复。此手术的优点主要有：（１）血管镜可以确诊瓣膜功能不全的程序，为瓣膜修复成形术提供可靠的依据；（２）此手术避免了     

股浅静脉第一对瓣膜环缩术治疗原发性下肢深静脉瓣膜功能不全(附40例报告)

目的 评估应用股浅静脉第一对瓣膜环缩术治疗原发性下肢深静脉瓣膜功能不全的疗效。方法 对原发性下肢深静脉瓣膜功能不全的40例患者(共45条下肢)施以股浅静脉第一对瓣膜环缩术．环缩材料选用7—0或6—0无损伤缝线。结果 经上述治疗后．全组病例术后随访2～24个月．临床症状均明显缓解。彩超复查88．6％(31／35)的患肢瓣膜无返流发生。结论 股浅静脉第一对瓣膜环缩术是治疗原发性下肢深静脉瓣膜功能不全比较理想和有效的方法。     

下肢深静脉瓣膜功能不全的瓣膜外修复成形术

目的研究和评价利用瓣膜外修复成形术治疗下肢深静脉瓣膜功能不全的疗效。方法对下肢深静脉瓣膜功能不全的２６例患者（３７条肢体）施以股静脉瓣膜外修复成形术。其中男１２例,女１４例;年龄１６～６９岁,平均年龄（５０８±１００）岁。所有肢体均施行股浅静脉第一对瓣膜外修复成形术,其中７条肢体加施股浅静脉第二对瓣膜外修复成形术,６条肢体加施股总静脉外瓣膜修复成形术。结果８１１％（３０／３７）的患肢静脉性跛行、酸胀、疼痛等症状消失,１８９％（７／３７）的患肢症状明显改善,所有肢体静脉曲张消失,７／９的肢体溃疡愈合。彩超复查除有４条肢体瓣膜功能不全Ⅰ～Ⅱ度外,其余肢体（８９２％）瓣膜功能恢复正常。结论深静脉外瓣膜修复成形术是治疗下肢深静脉瓣膜功能不全比较理想和有效的方法     

深静脉瓣膜重建术治疗下肢静脉倒流性疾病

为综合评价切开瓣膜修复术、静脉瓣戴戒术和静脉外肌袢成形术三种深静脉瓣膜重建手术的适应证与疗效，对１９９２年１月～１９９６年６月收治的６２例下肢静脉倒流性疾病患者进行了临床研究。全部患者均有不同程度的浅静脉曲张及下肢酸胀感，其中肿胀３０例，足靴区色素沉着２８例，溃疡１４例。病程为１年～３０年，平均１４．６年。１４例患者采用股浅静脉第１对瓣膜戴戒术，１例患者采用股浅静脉切开瓣膜修复术，４７例患者采用月国静脉外肌袢成形术。术后平均随访２０个月，所有患者症状缓解，１４例溃疡均愈合，无一例复发。结果表明：①戴戒术和瓣膜修补术适用于深静脉瓣膜功能不全倒流Ⅰ级～Ⅱ级；②肌袢成形术适用于深静脉瓣膜功能不全倒流Ⅲ级～Ⅳ级或先天性瓣膜功能缺陷；③戴戒材料宽度应增加到２ｃｍ；④对双股静脉畸形的原发性深静脉瓣膜功能不全，应同时行双股浅静脉第１对瓣膜戴戒术。认为，对月国静脉分支较多者仍可施行月国静脉外肌袢成形术，只要术中仔细操作，同样可取得优良效果     

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.     

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.     

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.