腹腔镜辅助下的腹主动脉瘤手术与传统手术的对比

腹主动脉瘤传统手术采用开腹人工血管置换，手术创伤大，术后患者恢复慢。随着腹腔镜在腹部外科应用的进展，传统腹主动脉瘤手术已经可以被腹腔镜辅助下完成人工血管置换所替代。此外，腹主动脉瘤腔内隔绝术部分并发症也能用腹腔镜辅助方式得到解决，现就该技术的操作、效果以及与传统手术的比较作一综述。     

腹主动脉瘤的腔内治疗最新进展和现状(文献综述)

腹主动脉瘤腔内治疗技术使腹主动脉瘤的外科治疗有了突破性进展。与传统开腹手术方法相比，腹主动脉瘤的腔内治疗特点是创伤小，出血少，可避免传统开腹手术所带来的巨大创伤和降低病人心肺等重要脏器的严重并发症和死亡率，尤其为高危病例提供了治疗的机遇。本文就腹主动脉瘤腔内治疗中的一些相关问题，如支架血管系统的设计特点、腹主动脉瘤腔内治疗的适应证和禁忌证、治疗条件和技术要领以及治疗结果和并发症等进行综述。     

腔内隔绝术治疗腹主动脉瘤--3例报告

目的　探讨腹主动脉瘤腔内隔绝术适应证的选择及并发症的防治。　方法　采用经股动脉将支架 -人造血管复合移植物导入腹主动脉治疗腹主动脉瘤。　结果　手术操作均获成功。无并发症发生。　结论　腔内隔绝术治疗腹主动脉瘤具有简捷、微创、并发症少、术后恢复快等优点。     

高危复杂腹主动脉瘤腔内修复术临床分析

目的 评估应用多种腔内技术治疗高危复杂腹主动脉瘤的可行性.方法 2001年1月至2010年12月,共138例腹主动脉瘤患者接受腹主动脉腔内修复术(EVAR),其中9例患者为高危复杂性腹主动脉瘤.男性8例,女性1例,年龄26～87岁,平均67岁.其中2例近肾腹主动脉假性动脉瘤,5例近肾腹主动脉瘤,1例腹主动脉瘤合并双髂总动脉瘤及左侧髂内动脉瘤,1例EVAR术后右髂内动脉瘤.所采用的腔内技术包括:主动脉支架开窗技术和扇形技术2例,烟囱技术5例,球囊辅助下髂内动脉瘤腔内治疗1例和球囊辅助反转支架技术1例.结果 所有腔内技术均获得成功.术中支架释放后即刻发现内漏4例,其中1例患者为Ⅰ型和Ⅲ型内漏,经大动脉球囊扩张后内漏消失;2例Ⅰ型内漏,其中1例行弹簧栓栓塞成功,另1例行近端裸支架成功.1例Ⅱ型内漏,经随访瘤腔直径未增大,未处理.随访4～79个月,平均25.9个月.无动脉瘤破裂,动脉瘤瘤体直径均有不同程度的缩小.随访过程中7例患者的靶血管(肾动脉、肠系膜上动脉和髂内动脉)均保持通畅.1例髂内动脉重建支架术后18个月血栓形成,但无盆腔缺血等症状.结论 对于不能耐受手术的高危复杂腹主动脉瘤患者,选择合适的腔内技术可以增加EVAR术的成功率,近、中期效果满意.     

《中国实用外科杂志》2012年第12期重点内容介绍 重点选题:腹主动脉瘤诊断与治疗

肾动脉平面以下腹主动脉瘤腔内治疗指征的商榷(汪忠镐,胡志伟)重视腹主动脉瘤规范化治疗(吴庆华)挑战主动脉弓:目前的证据与未来走向(郭伟,许永乐)腹主动脉瘤腔内治疗中的影像学价值(刘长建)腹主动脉瘤的手术时机(张纪蔚)腹主动脉瘤腔内治疗的合理选择与技术要点(符伟国,李永生,王玉琦)开放手术治疗腹主动脉瘤的地位与技术要点(陈忠)腹主动脉瘤围手术期管理(赵渝,李凤贺)     

腔内隔绝术治疗腹主动脉瘤(附5例报告)

目的探讨腹主动脉瘤腔内隔绝术的适应症及其并发症的防治。方法对5例患者采用经股动脉植入支架-人造血管复合移植物,对腹主动脉瘤进行腔内隔绝术。结果5例手术均获成功,无任何并发症发生。结论腔内隔绝术治疗腹主动脉瘤具有简捷、微创、并发症少、术后恢复快等优点,为治疗本病的首选方法。     

腔内隔绝术治疗腹主动态瘤——3例报告

目的：探讨腹主动脉瘤腔内隔绝术适应证的选择及并发症的防治。方法：采用经股动脉将支架－人造血管复合移植物导入腹主动脉治疗腹主动脉瘤。结果：手术操作均获成功，无并发症发生。结论：腔内隔绝术治疗腹主动脉瘤具有简捷，微创，并发症少，术后恢复快等优点。     

完全腹腔镜主动脉手术

传统的开放手术人工血管置入治疗腹主动脉瘤和主、髂动脉闭塞性疾病虽然围手术期风险较大,但是具有良好的长期通畅率.自20世纪90年代以来,腔内技术在治疗腹主动脉瘤及主、髂动脉闭塞疾病方面有了飞速发展,并获得了良好的成功率和较低的围手术期病死率.但腔内治疗后可能发生内漏、移位、动脉瘤破裂、血栓形成等多种并发症,而且昂贵的材料费对患者及医疗保险都是不小的压力.主髂动脉闭塞性疾病中的TASC A、B型大都可以通过腔内治疗完成,但是C、D型的患者使用腔内治疗尚有难度.因此,腹腔镜技术在腹主动脉手术中的运用结合了传统开放手术的稳定性和腔内治疗的微创性,其手术在近年来不断获得改进并被证实是安全可行的[1-3],具有良好的发展前景.     

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微创技术在血管外科领域的应用导致了一个崭新的学科—腔内血管外科的诞生。1964年ＣｈａｒｌｅｓＤｏｔｔｅｒ使用同轴导管技术为1例83岁的下肢动脉硬化闭塞症导致左足溃疡合并感染并且伴有心功能不全的女性病人施行了世界首例经皮腔内血管成形术,这一微创手术的成功不仅标志着腔内血管外科技术的出现,同时也在一开始就充分体现了腔内血管外科技术安全、微创的特点。20世纪80年代以后,球囊导管血管成形术和血管支架广泛用于阻塞病的治疗。最近10年来,腔内隔绝术治疗腹主动脉瘤、胸主动脉瘤、胸主动脉夹层动脉瘤等动脉扩张病的成功是微创技…     

中国腹主动脉瘤腔内治疗十二年回顾与展望

腹主动脉瘤腔内修复术（endovascular bdominal aorticaneurysm repair,EVAR）是近二十年来发展起来的一种通过血管腔内技术修复腹主动脉瘤瘤腔,治疗腹主动脉疾病的新型微创手术。1991年,Parodi首次报道了21例EVAR术。1998年,景在平等报道了国内首例腔内修复术治疗腹主动脉瘤。12年来,EVAR在中国已经获得了广泛的应用,由于其创伤小、术后恢复快,尤其适合于一般情况较差,合并症较多的老年患者。     

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.     

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.     

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.     

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.     

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.