间置空肠长度对贲门癌术后预防反流性食管炎的影响

目的探讨贲门癌近端胃切除间置空肠长度对预防反流性食管炎的影响。方法采用信封法将80例贲门癌患者随机分为:A组(40例),间置空肠长度为20～25cm;B组(40例),间置空肠长度大于40cm。术后对两组病例分别作胃镜和消化道X线钡餐造影,并于术后7d和2～3个月后行连续24h食管pH值监测,同时观察临床自觉症状,以评价食管反流的情况。结果A组5例(12.5%)术后出现反流性食管炎。B组24h食管pH值显著高于A组,差异有统计学意义(P<0.01)。结论间置空肠长度以大于40cm以上为好。     

黏膜瓣式食管胃吻合术抗反流的食管动力学研究

目的寻找一种实用有效的抗反流食管胃吻合术式。方法将食管癌和贲门癌患者464例随机分为黏膜瓣式食管胃吻合术组(A组,175例)、器械食管胃吻合术组(B组,151例)和单纯手工缝合食管胃一层吻合术组(C组,138例)。应用同位素测定胃食管反流指数和24h监测pH值,进行3组间的食管运动功能比较。结果同位素测定胃食管反流指数显示,A组反流阳性率为0,B组为33.3%,C组为6.7%。食管运动功能及24h监测pH显示,A组检测各项指标均接近正常值,B、C组与正常值比较,差异具有统计学意义(P<0.05)。结论黏膜瓣式食管胃吻合术式具有优异的抗反流功能,并能有效地防止食管癌、贲门癌术后反流性食管炎的发生。     

空肠间置术预防贲门癌术后反流性食管炎

目的　探讨贲门癌近端胃切除空肠间置术后预防反流性食管炎的效果。　方法　贲门癌近端胃切除空肠间置术患者 ,于术后作胃镜和消化道 X线钡餐造影 ,4 8例患者于术后 7天和 2～ 3个月行连续 2 4小时 p H值监测 ,以评价食管反流的情况。　结果　 6例术后出现反流性食管炎 ,发生率 9.68%。　结论　采用空肠间置术行消化道重建对预防贲门癌术后反流性食管炎具有良好的临床效果。     

贲门癌近端胃切除空肠间置术预防反流性食管炎

贲门癌行近端胃切除后传统的消化道重建方法是食管胃吻合术，但术后很多病人发生胃食管反流和反流性食管炎，严重影响生活质量。为探讨空肠间置术对预防反流性食管炎的效果，1995年10月至2003年10月，我们对部分贲门癌病人行近端胃切除后采用空肠间置的消化道重建术，并与同期施行的食管胃吻合术者进行对比分析，现报道如下。     

食管胃垂瓣吻合在贲门癌术后抗反流的临床研究

目的评价食管胃垂瓣吻合术式在贲门癌术后抗反流的作用。方法将40例贲门癌患者随机分成研究组和手术对照组,每组20例,吻合方式分别采用食管胃垂瓣吻合术和传统食管胃吻合方式。在术后3个月分别采用24 h pH监测及胃镜检查,观察术后胃食管反流情况。另选10例健康人设为正常对照组。结果术后近期研究组及手术对照组pH各项监测指标均高于正常对照组(P0.05),手术对照组高于研究组(P0.05);两组反流性食管炎分级及组织学食管黏膜炎症程度均高于正常对照组(P0.05),而手术对照组高于研究组(P0.05)。结论食管胃垂瓣吻合术后也有一定的反流现象,但和传统手术相比,食管胃垂瓣吻合术具有明显抗反流作用。     

贲门癌切除带蒂空肠间置预防反流性食管炎

贲门癌切除带蒂空肠间置预防反流性食管炎娄熙彬叶爱珍我们自１９９３年２月以来对３０例贲门癌患者，采用节段空肠间置食管残胃吻合术，以研究此种消化道重建术在预防反流性食管炎中的实用价值。本术式采用经腹胸骨下段劈开或上腹部正中切口。常规游离、切除食管下段和近...     

空肠间置预防返流性食管炎的临床研究

目的 了解近端胃切除或全胃切除后间置空肠的消化道重建术，预防术后返流性食管炎的情况。方法 1995—2000年共收治30例贲门癌患者，对Henley消化道重建术式作了技术改进，将代胃的空肠长度增加至40cm以上，术后行食管胃肠造形，胃镜检查，取组织活检及返流液的pH测定。结果 改良的Henley术式符合正常的生理通道，操作简便易行，并发症少，术后生活质量好。结论 空肠间置术做为贲门癌切除(全胃切除或近端胃切除)消化道重建术式，可有效预防返流性食管炎的发生。     

近端胃癌患者根治性切除术后三种消化道重建方式的对比研究

目的比较胃底贲门癌患者根治性胃切除术后不同消化道重建术式的反流性食管炎发生情况及生活质量。方法前瞻性人组2010年2月至2011年8月间河南省肿瘤医院收治的、拟行根治性胃切除的123例胃底贲门癌患者,按照随机数字表法分为3组,每组41例,在根治性胃切除术后分别行空肠间置吻合术、食管残胃后壁吻合术及食管空肠Roux-en-Y吻合术。分别于术前和术后1月行胃排空试验和食管下段pH值测定以评估患者食管反流情况．追踪肝肾功能及血常规变化情况：于术前和术后12月评估患者肝肾功能及生活质量。结果3组患者手术前、后血常规和肝肾功能指标的变化均无统计学意义（均P〉0．05）。术后空肠间置吻合组、食管残胃后壁吻合组和食管空肠Roux—en—Y吻合组分别有1例（2．4％）、10例（24．4％）和7例（17．1％）患者出现反流性食管炎症状,差异具有统计学意义（P=0．017）;分别有1例（2．4％）、7例（17．1％）和8例（19．5％）患者于上消化道钡餐造影检查时发现钡剂反流入食管,差异有统计学意义（P=0．046）;食管下段pH值分别为6．9±0．2、6.8±0．1和6．9±0．1,差异无统计学意义（P=0．196）。术后1年,3组患者在整体健康状况、躯体功能、情绪功能、疲劳、恶心呕吐、疼痛症状、便秘及腹泻方面的生活质量评分明显优于术前（均P〈0．05）;空肠间置吻合组患者在整体健康状况、情绪功能、恶心呕吐、便秘及腹泻方面的生活质量评分显著优于其他两组（均P〈0．05）。结论近端胃癌患者根治性胃切除术后采用空肠间置吻合术、食管残胃后壁吻合术及食管空肠Roux—en—Y吻合术均能够满足消化道重建的需要,能够有效地改善患者的生活质量;其中空肠间置吻合重建术在减少反流性食管炎的发生和提高患者生活质量方面的效果更为显著,是比较理想的近端胃癌根治术后消化道重建术式。     

食管癌贲门癌术后酸反流与十二指肠胃食管反流

目的 探讨食管癌和贲门癌术后酸反流和十二指肠胃食管反流(DGER)的相互关系、反流特征以及对食管黏膜的损伤作用.方法 对32例食管癌和贲门癌术后病人进行烧心、反酸症状调查,应用电子胃镜检查、24 h食管pH和胆红素同步监测.结果 (1)胃食管反流症状的发生率65.6%,反流性食管炎的发生率为75.0%,其中2例发生Barrett食管,发生率为6.25%.(2)24 h食管pH和胆红素监测结果显示,28.1%的病人仅存在酸反流,15.6%仪存在DGER,53.1%同时有酸反流和DGER.DeMeeste评分与abs>0.14的时间百分比无明显的相关性(P=0.3109).平卧位pH<4.00的时间百分比和abs>0.14的时问百分比明显高于直立位(P<0.05).(3)通过比较在不同pH区间内胆红素的吸收率,显示在pH 3～6的区间内,胆红素abs>0.14的时间百分比明显高于其他区间(P<0.05).(4)DeMeester评分和胆红素abs>0.14的时间百分比与反流症状评分无明显的相关(P>0.05),与反流性食管炎评分呈正相关(P<0.05).结论 食管癌和贲门癌术后存在广泛的酸反流和DGER,反流形式以混合性反流为主(同时出现酸反流和DGER),混合性反流对食管黏膜的损伤作用更严重.酸反流和DGER均受体位影响.24 h食管pH和胆红素同步监测有助于揭示反流特征及反流物对食管黏膜的损伤作用.     

全胃切除术后保留幽门环间置空肠消化道重建与食管空肠Roux-en-Y吻合的应用价值

目的评价全胃切除术后保留幽门环间置空肠消化道重建与食管空肠Roux-en-Y吻合两种消化道重建方式的临床应用价值。方法总结30年来全胃切除术后采用保留幽门环间置空肠消化道重建术与食管空肠Roux-en-Y吻合术治疗54例胃底贲门癌和胃体癌(Ⅰ期)患者的临床资料。结果间置空肠消化道重建术27例,无手术死亡;其中1例术后5d出现间置空肠排空障碍,经治疗3周恢复正常;27例均治愈出院;术后6个月～1年,全组均进食量增加,每餐可达200～300g,每日3～5餐;检查见间置空肠代偿性扩张,最大直径达6cm。食管空肠Roux-en-Y吻合术27例,无手术死亡;25例治愈出院;2例吻合口瘘,经治疗3周后瘘口愈合;术后6个月仍有3例发生倾倒综合征,5例出现轻度胆汁反流性食管炎。结论保留幽门环间置空肠消化道重建术是简单可行而有效的方法。食管空肠Roux-en-Y吻合术更为简单,适用于年老、重症或姑息性全胃切除的患者,但部分患者可出现倾倒综合征和反流性食管炎是其缺点。     

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.