肝内胆管手术入路的解剖及临床应用

目的 探讨显露肝内叶、段胆管的手术入路。方法 研究30例成人肝脏标本的肝内叶、段胆管与血管的毗邻关系。结果 左右肝管均位于肝脏脏面门静脉门静脉左右干的前上缘,左内叶、右前叶胆管位于相应门静脉的前内侧。右后叶胆管位于门静脉右面支或右前叶下段支脏面深侧者占73％（22／30）;位于门静脉右后支脏面深侧或后上缘者占80％（24／30）。左外叶胆管位于门静脉矢状部脏面深侧者占93％（28／30）。选择经肝的脏面显露肝门、左右肝管,经肝的膈面显露肝内叶、段胆管相结合的手术入路,治疗复杂性肝内胆管结石并狭窄患者38例,均获成功。结论 经肝的脏面与膈面相结合的手术入路,比较容易显露和切开肝内胆管及其狭窄段、便于取出结石。     

显露和切开肝内各叶段胆管手术进路选择的解剖基础与临床体会

为适应现代肝胆外科肝内胆道手术技术的需要,选择可行的手术进路,研究新的手术方法。作者观察了30个人肝标本的肝内各叶、段胆管与相应门静脉、肝动脉分支走行、位置的解剖关系。结果表明:肝门胆管、左右肝管及左内叶胆管的显露和切开应从脏面进路。右肝内各叶、段胆管的显露和切开则膈面进路优于脏面进路。上述进路用于临床手术治疗复杂肝内胆管多发结石并多处胆管狭窄35例取得成功。     

显露和切开肝内各叶段胆管手术进路选择的解剖基础与临床体会

为适应现代肝胆外科肝内胆道手术技术的需要，选择可行的手术进路，研究新的手术方法。作观察了30个人肝标本的肝内各叶、段胆菅与相应门静脉、肝动脉分支走行、位置的解剖关系。结果表明：肝门胆量、左右肝管及左内叶胆管的显露和切开直从脏面进路。右肝内各叶、段胆管的显露和切开则膈面进路优干脏面进路。上述进路用于临床手术治疗复杂肝内胆管多发结石并多处胆管狭窄35例取得成功。     

复杂性肝内胆管结石的外科治疗

目的　总结复杂性肝内胆管结石的外科治疗方法及效果。 方法　 总结分析１９９２ ～１９９８ 年外科治疗复杂性肝内多段胆管结石并多处胆管狭窄３５ 例的手术方法,总结显露与切开肝内狭窄段胆管、取出结石、解除狭窄的经验和体会。 结果　３５ 例无手术死亡,术后近期并发感染、胆漏、肝功能不全或消化道出血共７ 例,均治愈;残留结石９ 例,术后经胆道镜取净结石７ 例。随访６ 个月至５ 年６ 个月２４ 例,优良２１ 例（８８ ％ ） ,好转２ 例（８ ％ ） ,无效１ 例（４ ％ ） 。 结论　复杂肝内胆管结石外科治疗的关键是显露和切开肝内各叶段胆管的狭窄段,取出结石、建立通畅的胆流通道。经肝门区或肝方叶可以显露和切开肝门胆管、左右肝管和左内叶、右前叶胆管,经肝膈面切开肝实质进路,可以显露和切开右肝内各叶段胆管。     

右肝各肝段胆管的显露和切开

为适应右肝内各段胆管的显露，切开和肝段切除手术的需要．作者研究了30个人肝标本的肝内各叶、段胆管、血管的解剖关系。选择肝脏膈面切开肝实质进路，比较容易显露右肝各段胆管的汇合部，便于进行右肝内胆管的切开．肝段切除等肝内手术。用于临床手术治疗右肝内胆管多发结石并多处狭窄的患者10例，取得成功，效果满意。     

右肝后叶胆管切开整形治疗右肝后叶胆管狭窄及结石的临床研究

自1990年6月～1995年6月，采用右肝后叶胆管切开整形治疗右肝后叶胆管狭窄及结石16例，并观察了右肝后叶胆管与门静脉右后支的关系。结果表明，多数右肝后叶胆管与门静脉右后支的关系较恒定，即门静脉右后支由门静脉右干发出后，于右肝后叶胆管起始部附近的右前向右后上方斜行，沿9～11点方向切开右肝后叶胆管可避免损伤门静脉的右后支，右肝后叶胆管的显露常需要行Ⅳ段或Ⅳ＋Ⅴ段部分肝切除，其中行Ⅳ段部分肝切除6例，行Ⅳ＋Ⅴ段部分肝切除者4例。16例行胆管整形后均行胆肠Roux－Y吻合，并行右肝后叶胆管U管支撑引流，U管平均留置时间3．4个月。手术各种并发症发生率为25％（4／16），残留结石率为12．5％（2／16）。远期随访手术效果优良率为93．75％（15／16）。     

规则性肝段切除术治疗肝内胆管结石病

目的 总结采用肝段切除术治疗肝内胆管结石病的经验。方法 回顾性分析1975年1月至1998年12月间采用肝段切除术治疗514例肝内胆管结石的临床资料及远期疗效。结果 肝内胆管结石的分布：左外叶64例、左肝叶176例、右前叶10例、右后叶24例、右肝叶31例、双侧肝叶209例。合并症：合并有显著肝段或肝叶萎缩者280例，肝脓肿17例，胆瘘7例，胆管癌8例。265例有1-5次胆道手术史。手术方法：根据肝内结石的分布决定肝段或联合肝段切除的范围，其中S2－3切除284例、切除98例、切除26例、切除37例、双侧肝叶部分切除23例。附加术式包括经肝门胆管切开取石217例，经肝实质肝内胆管切开取石11例，胆管空肠Roux-en-Y吻合296例。术后并发症有胆漏15例（2.9%）、膈下感染23例(4.5%)、腹腔脓肿2例（0.4%）和肝衰3例（0.6%）等。11例（2.1%）术后死于肝衰竭。随访10个月到25年，75.9%症状消失，14.5%偶而有轻度胆管炎发作，9.6%仍反复发作严重胆道感染。49例手术效果差的主要原因是肝脏切除范围不够兖分而遗留病变的肝胆管。结论 规则性肝叶切除术是清除病灶的最有效手段。     

胆道镜下球囊扩张取石术治疗肝内胆管结石合并胆管良性狭窄的疗效分析

目的:探讨胆道镜下球囊扩张取石术治疗肝内胆管结石合并胆管良性狭窄的疗效.方法:回顾性分析山东省立第三医院近6年来134例接受胆道镜下球囊扩张取石术治疗的肝内胆管结石合并胆管良性狭窄患者病例资料.其中左外叶胆管狭窄30例,占22.39％;左内叶胆管狭窄25例,占18.66％;右前叶胆管狭窄26例,占19.40％;右后叶胆...     

肝叶肝段切除治疗肝内胆管结石并狭窄的随访效果

作者报告１５年间行肝叶、肝段切除治疗肝内胆管结石并狭窄９６例，有２７例肝叶或肝段切除后剖开狭窄胆管与空肠大口吻合。随访７９例，优良效果９３．６７％。作者认为：局限于部分肝叶、肝段胆管的多发结石并狭窄或末梢胆管多发结石等最适于肝叶、肝段切除。对于左右肝内胆管广泛多发结石并狭窄者，肝部分切除后剖开其它部位的狭窄胆管取出结石行胆管空肠大口吻合联合手术是合理的。     

肝内胆管结石并胆管狭窄的治疗

为探讨肝内胆管结石并胆管狭窄的外科治疗，对１０年来收治的１６８例肝内胆管结石并胆管狭窄的术前检查、结石及狭窄的部位和分布情况、手术方式、手术后并发症及残余结石的处理进行了分析。结果显示：１６８例中，左肝内胆管结石、全肝结石和右肝内胆管结石分别是８３，５９和２６例；左外叶及左半肝切除１１６例；右肝段切除２２例；高位胆管切开整形胆肠大口吻合９６例；残石率３％；１３例出现手术后并发症；随访１４２例，优良效果９６．５％。结果提示肝叶、肝段切除联合肝胆管空肠大口吻合是肝内胆管结石并胆管狭窄的最佳治疗选择。     

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.     

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.     

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.