经腹腔镜胰体尾部切除术治疗胰腺良性肿瘤

目的 探讨腹腔镜胰体尾部切除治疗胰腺良性肿瘤的方法 及安全性、可行性.方法 2009年11月到2010年5月,对3例胰腺体尾部占位性病变的病人实施了腹腔镜胰体尾部切除术(1例保留脾脏,2例联合脾脏切除).结果 所有手术均在手辅助腹腔镜下成功完成.手术时间75～185 min,平均120 min;出血量90～210 ml...     

保留脾脏的胰体尾部良性肿瘤切除

目的探讨保留脾脏胰体尾切除的可行性和安全性以及并发症预防。方法回顾性分析总结2009年1月至2011年12月行保留脾脏胰体尾切除术5例资料,其中保留脾脏血管的开腹保脾胰体尾切除3例,切断(或切除)脾脏血管的保脾胰体尾切除术1例,腔镜下保脾胰体尾部切除术1例。结果本组无手术死亡,术后均未发生胰瘘、脾梗死、脾脓肿及脾出血等。随访3～6月,无并发症发生。结论胰体尾部良性肿瘤,应首选保留脾脏的胰体尾切除方法,手术安全,效果好,且避免了脾脏的不必要切除。     

腹腔镜保脾胰体尾切除八例的手术经验

目的总结保留脾脏腹腔镜胰体尾切除术的临床经验与手术技巧。方法自2003年11月至2008年2月,我们对8例胰体尾部良性占位病变患者施行保留脾脏腹腔镜胰体尾切除术。结果本组8例均在腹腔镜下完成,其中1例合并胆囊切除,1例合并右肾上腺肿瘤切除,1例合并子宫肌瘤挖出、左卵巢畸胎瘤挖出,1例合并子宫肌瘤挖出。本组手术时间120—290min,出血量150—600ml。术后住院时间3～9d,无胰漏发生。术后病理诊断：潴留性囊肿2例,浆液性囊腺瘤1例,黏液性囊腺瘤2例,上皮性囊肿2例,先天性囊肿1例。随访9～60个月,症状消失,未见复发。结论对于胰体尾部良性病变,可行保留脾脏的胰体尾部切除,对拥有丰富高级腹腔镜手术经验的术者,开展保留脾脏的腹腔镜胰体尾切除术是安全可行的。     

腹腔镜保留脾脏胰体尾切除术治疗胰腺囊性疾病6例报告

目的总结腹腔镜保留脾脏胰体尾切除术的临床经验与手术技巧。方法自2003年11月至2006年7月，我们对6例胰腺囊性疾病患者施行保留脾血管的腹腔镜保留脾脏胰体尾切除术。结果本组6例均在腹腔镜下完成，其中1例合并右肾上腺肿瘤切除，1例合并子宫肌瘤切除、左卵巢畸胎瘤切除，1例合并子宫肌瘤切除，1例合并胆囊切除。手术时间140～265min，出血350～600ml。术后住院时间4—9d，无胰漏发生。随访1—31个月，症状消失，未见复发。病理诊断：潴留性囊肿2例，浆液性囊腺瘤2例，黏液性囊腺瘤2例。结论对于胰体尾部良性病变，应首选保留脾血管的腹腔镜保留脾脏胰体尾切除术，施行保留脾血管的腹腔镜保留脾脏胰体尾切除术是安全可行的。     

腹腔镜下保留脾脏的胰体尾切除术临床应用:附5例报告

目的:探讨腹腔镜下,对胰体尾部良性肿瘤进行保留脾脏胰体尾切除术的可行性与安全性评估。方法:2008年2月至2010年6月对5例胰体尾良性肿瘤病人施行腹腔镜下保留脾脏的胰体尾切除术。结果:5例病人手术均顺利完成,平均手术时间为204(115～295)min,术中平均出血量310(200～450)mL,术后平均住院时间14(10～21)d。术后1例病人发生胰漏,延迟拔管后治愈出院。术后病理诊断为胰体尾浆液性囊腺瘤3例,黏液性囊腺瘤1例,胰岛细胞瘤1例。结论:对胰体尾部的良性病变行腹腔镜下保留脾脏的胰体尾切除术是微创、安全的,具有恢复快、并发症少等优点,值得推广。     

腹腔镜下保留脾脏的胰体尾切除术4例

目的：探讨在腹腔镜下,对胰体尾部肿瘤患者进行保留脾脏的胰体尾切除术的可行性与安全性。方法：我院2008年2月—2010年4月对4例胰体尾良性病变施行腹腔镜下保留脾脏的胰体尾切除术。结果：4例手术均顺利完成,平均手术时间为235（115～305）min,术中平均出血量为200（100～450）mL,术后平均住院时间为12.8（10～21）d,术后有1例患者产生胰瘘,延迟拔管,治愈后出院。术后病理诊断为胰体尾浆液性囊腺瘤2例,黏液性囊腺瘤1例,胰岛细胞瘤1例。结论：对胰体尾部的良性病变行腹腔镜下保留脾脏的胰体尾切除术是微创并安全的,具有恢复快、并发症少等优点。     

腹腔镜胰体尾（保脾）切除术

目的 探讨在腹腔镜下,对远端胰腺肿瘤患,施行胰体及胰尾部分切除手术的同时,保留脾脏的可能性。方法 在腹腔镜下,仔细分离胰体及胰尾部位与脾脏相关的血管,在原位保留与脾脏相连的胃短血管,为保留脾脏及完成胰腺体部及尾的切除创造条件。结果 本组11例中,除l例因胰腺癌灶的局部侵蚀,病变较重,无法分离脾门区血管,另l例因肥胖而被迫中转开腹手术外,其余9例均在腹腔镜下完成了胰腺的部分切除及保留脾脏的手术,随访平均30个月,情况良好。结论 位于胰腺体部或尾部的良性肿瘤患,有选择地在腹腔镜条件下进行胰腺体尾部的部分切除手术并保留脾脏是可行的。     

腹腔镜下保留脾脏的胰体尾切除术的临床研究

目的:探讨腹腔镜下保留脾脏的胰体尾切除术的临床价值。方法:回顾分析2014年11月至2016年4月为3例胰腺体尾部肿瘤患者行腹腔镜下保留脾脏的胰体尾切除术的临床资料。结果:3例均成功施行腹腔镜下保留脾血管的保脾手术,无中转开腹,其中1例术中撕裂脾静脉,腹腔镜下缝合脾静脉撕裂处,成功止血,72 h后恢复进食。1例患者因囊性肿瘤巨大,术中囊液外溢,造成术后胰腺切除区形成直径3 cm包裹性积液,术后2周自行吸收。术后病理均回报为胰腺粘液性囊腺瘤。出院后随访3～12个月,未见远期并发症及复发病例。结论:腹腔镜下保留脾脏的胰体尾切除术目前已成为治疗胰体尾良性肿瘤安全、可行的新选择,因其创伤小、康复快,已成为治疗胰体尾良性肿瘤的常规手术,目前也可在基层医院开展,但此术式仍需严格遵守循序渐进的推行原则。     

腹腔镜胰体尾脾脏联合切除术四例报告

目的探讨腹腔镜下胰体尾、脾脏联合切除术的临床应用。方法对我院2004年2月~2006年2月对胰尾占位病变实施腹腔镜下脾脏、胰体尾联合切除术4例的临床资料进行回顾性分析。结果手术均在全腹腔镜下成功完成,平均手术时间为206min,平均出血量为160ml。无手术并发症发生。术后平均住院8.3d。结论在腹腔镜下实施脾脏、胰体尾联合切除术是可行的。本方法具有创伤小、恢复快的优点。     

全腹腔镜下保留脾脏胰体尾切除术在儿童病例中的应用

目的探讨完全腹腔镜下保留脾脏胰体尾切除术在治疗儿童胰体尾良性、交界性肿瘤中的安全性、可行性及疗效。方法回顾性分析2017年6月至2018年3月十堰市太和医院收治的3例儿童胰体尾肿瘤患儿(年龄分别为10岁、9岁、12岁)行完全腹腔镜下保留脾脏胰体尾切除术的临床资料。结果 3例患儿均在全腹腔镜下完成保留脾脏胰体尾切除术,1例采用Warshaw法,2例采用Kimura法,手术时间分别为210 min、180 min、210 min,术中出血量分别为200 mL、50 mL、50 mL,术后平均住院时间为11 d, 3例患儿术后病理诊断均为胰腺实性假乳头状瘤,术后均无再次手术,无腹腔出血、消化道出血、胃瘫等并发症发生,其中1例术后并发A级胰瘘,经积极保守治疗后治愈。术后随访31～40个月,效果良好,无肿瘤复发,均未出现糖尿病和慢性腹泻等并发症。结论对于儿童胰体尾良性、交界性肿瘤,腹腔镜下保留脾脏的胰体尾肿瘤切除术是相对安全、有效、可行的,具有创伤小、恢复快等优势,保留脾脏可使患儿更多获益,值得在儿童病人中选择应用。     

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.     

Is the recovery profile of mivacurium independent of the rate of decay of its plasma concentration in patients with normal plasma cholinesterase activity?

Background: The duration of action of muscle relaxants is poorly correlated to the rate of decay of their plasma concentration. The plasma concentration of mivacurium may rapidly decrease below its active concentration because of the extensive hydrolysis of mivacurium. By inflating a tourniquet on one upper limb for 3 min after the administration of atracurium, mivacurium or vecuronium, we studied the influence of the initial decline of their plasma concentration on their effect. Methods: In 50 patients anaesthetised with thiopental, isoflurane and fentanyl, the effect of bolus doses of 0.15 or 0.25 mg . kg^?1 mivacurium (MIV 15, MIV 25), 0.3 or 0.5 mg . kg^?1 atracurium (ATR 30, ATR 50) and 0.06 or 0.1 mg . kg^?1 vecuronium (VEC 06, VEC 10) were measured on both arms (evoked response of the adductor pollicis to train-of-four stimulation every 12 s), a tourniquet being applied on one arm just before and during 3 min after the muscle relaxant bolus. Results: Tourniquet inflation of 3 min almost abolished the neuromuscular effect of mivacurium. In the vecuronium groups and in the ATR 50 group, tourniquet inflation did not modify the maximum degree of depression of the twitch response. Also, the duration of action of vecuronium was unaffected by the tourniquet. In the ATR 30 group, times to return of the twitch response to 25% (duration 25%) and 75% (duration 75%) of control response were significantly shorter in the cuffed arm, 23 min vs 27 min, and 41 min vs 45 min, respectively. In the ATR 50 group, only duration 25% was significantly shorter in the cuffed arm (41 min vs 45 min). Conclusion: The results suggest that the rate of decline of the plasma concentration of mivacurium is so rapid, that a very low and almost clinically ineffective concentration is present as soon as 3 min after its administration. The results also indicate that the recovery from a mivacurium-induced neuromuscular blockade is not influenced by the rate of decay of its plasma concentration in patients with genotypically normal plasma cholinesterase.     

Membranes in Artificial Organs

Abstract: Membrane processes play a pivotal and enabling role in modern replacement therapy for acute and chronic organ failure and in the management of immunologic diseases. In fact, virtually all contemporary extracorporeal blood purification methods employ membrane devices, and the next generation of artificial organs and tissue engineering therapies are almost certain to be similarly grounded in membrane technology. In this short essay, we comment on the similarities and differences among synthetic membranes and their natural counterparts and also provide a critical overview of the demographics and technology of hemodialysis, hemofiltration, apheresis, oxygenation, and emerging membrane technologies and applications.     

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.     

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.