胃镜下活检诊断高级别胃上皮内瘤变与手术后病理对比分析

目的探讨胃镜下活检诊断高级别胃上皮内瘤变(HGIN)与手术后病理的关系。方法 2010年2月至2017年6月在本院行胃镜活检诊断为HGIN,并在1个月内接受手术治疗的62例患者作为研究对象,收集和对比患者术前胃镜下活检结果以及术后病理组织学结果。结果胃镜下检查显示,浅表隆起糜烂型22例,息肉型13例,溃疡型27例,病灶部位:胃窦21例(33.87%),胃体14例(22.58%),贲门10例(16.13%),胃角12例(19.35%),胃底5例(8.06%)。术前胃镜活检检查发现62例均为HGIN,其中重度不典型增生患者25例,原位癌患者37例,术后病理组织检查结果显示:62例患者中有26例符合HGIN诊断,其中重度不典型增生患者18例,原位癌8例,早期胃癌20例,进展期胃癌15例,低级别内瘤变1例,术前胃镜活检检查的结果和术后病理组织检查结果比较,差异有统计学意义(P0.05)。结论高级别上皮内瘤变的诊断与治疗需多方面综合考虑,临床与病理医师仔细判断、及时手术。     

结肠镜活组织检查在结直肠高级别上皮内瘤变诊断中的应用研究

目的研究结肠镜活组织检查在结直肠高级别上皮内瘤变(HGIN)诊断中的应用价值。方法选取2019年1月至2020年12月本院收治的有结直肠肿瘤特征患者400例纳入研究,所有患者均行术前结肠镜活检,并行术后切除病理标本检查。比较两种方法对HGIN的诊断效能。结果 50例HGIN患者接受全瘤切除活检13例(26.00%),其中内镜下切除术10例,经肛切除术3例;根治性切除术37例(74.00%)。13例全瘤切除活检患者术后病理诊断显示HGIN 9例,浸润性癌4例;37例根治性切除术患者术后病理诊断显示HGIN 20例,浸润性癌4例。结论结肠镜活组织检查对HGIN具有很高的诊断价值,临床工作中应当根据其病变大小、部位、分化程度慎重并及时处理,确保患者临床治疗效果。     

经内镜隧道式黏膜下剥离术切除胃黏膜病变的应用报道

目的 内镜黏膜下剥离术(ESD)已经广泛应用于胃癌前病变和早癌等黏膜病变的治疗中,但对于大面积病变,ESD操作方法仍有一定困难。随着隧道技术的发展与应用,我们首次应用经内镜隧道式黏膜下剥离术(ESDTT)切除胃黏膜病变。方法 从2012年8月至2012年9月我院共有4例患者因术前诊断为胃癌前病变或早癌行ESDTT术。4例病变均整块切除,操作时间34~97min,平均65min;切除标本大小4~5cm,平均为4.3cm。结果 术后病理提示高级别上皮内瘤变2例,黏膜内癌2例,病变基底与边缘均未见残留。患者术后均未出现出血、穿孔等并发症。结论 ESDTT切除胃大面积黏膜病变安全可行。     

结直肠上皮内瘤变的诊断意义与处理原则

目的 探讨结直肠上皮内瘤变病理诊断的临床意义和外科治疗的原则.方法 于2004年1月至2008年6月共收治术前经内镜活检、病理诊断为"上皮内瘤变"的病例共158例(共162个肿瘤),其中诊断为低级别上皮内瘤变73例,高级别上皮内瘤变89例.行腺瘤切除术5例,根治性结肠切除手术49例,直肠低位前切除术74例,经肛门局部切除术16例,Hartmann直肠经腹切除结肠造口术2例,腹会阴切除术4例,Parks结肠肛管吻合术7例,乙结肠造口术1例.经手术切除的标本常规作病理学检查,并与该患者的术前活检作比较,进行回顾性分析.结果 术后109例(67.3%)病理证实为浸润性腺癌,在89例术前诊断为高级别上皮内瘤变的腺瘤中,80例(89.9%)术后病理确定是腺癌;在低级别上皮内瘤变中亦有29例(39.7%)术后确定为浸润性腺癌.在109例腺癌中2例伴有肝转移(MI),18例则有邻近组织浸润(T4).术后病理证实有局部淋巴结转移或见癌结节者26例(23.9%).结论 应重视结直肠上皮内瘤变的病理诊断,高度警惕高级别上皮内瘤变.在临床和内镜中疑为恶性的病变,若不涉及保肛问题,宜首选作病变肠段切除,如术中可确诊为浸润性癌,则应作根治性切除.     

结直肠上皮内瘤变的诊断意义与处理原则

目的 探讨结直肠上皮内瘤变病理诊断的临床意义和外科治疗的原则.方法 于2004年1月至2008年6月共收治术前经内镜活检、病理诊断为"上皮内瘤变"的病例共158例(共162个肿瘤),其中诊断为低级别上皮内瘤变73例,高级别上皮内瘤变89例.行腺瘤切除术5例,根治性结肠切除手术49例,直肠低位前切除术74例,经肛门局部切除术16例,Hartmann直肠经腹切除结肠造口术2例,腹会阴切除术4例,Parks结肠肛管吻合术7例,乙结肠造口术1例.经手术切除的标本常规作病理学检查,并与该患者的术前活检作比较,进行回顾性分析.结果 术后109例(67.3%)病理证实为浸润性腺癌,在89例术前诊断为高级别上皮内瘤变的腺瘤中,80例(89.9%)术后病理确定是腺癌;在低级别上皮内瘤变中亦有29例(39.7%)术后确定为浸润性腺癌.在109例腺癌中2例伴有肝转移(MI),18例则有邻近组织浸润(T4).术后病理证实有局部淋巴结转移或见癌结节者26例(23.9%).结论 应重视结直肠上皮内瘤变的病理诊断,高度警惕高级别上皮内瘤变.在临床和内镜中疑为恶性的病变,若不涉及保肛问题,宜首选作病变肠段切除,如术中可确诊为浸润性癌,则应作根治性切除.     

结直肠上皮内瘤变的诊断意义与处理原则

目的 探讨结直肠上皮内瘤变病理诊断的临床意义和外科治疗的原则.方法 于2004年1月至2008年6月共收治术前经内镜活检、病理诊断为"上皮内瘤变"的病例共158例(共162个肿瘤),其中诊断为低级别上皮内瘤变73例,高级别上皮内瘤变89例.行腺瘤切除术5例,根治性结肠切除手术49例,直肠低位前切除术74例,经肛门局部切除术16例,Hartmann直肠经腹切除结肠造口术2例,腹会阴切除术4例,Parks结肠肛管吻合术7例,乙结肠造口术1例.经手术切除的标本常规作病理学检查,并与该患者的术前活检作比较,进行回顾性分析.结果 术后109例(67.3%)病理证实为浸润性腺癌,在89例术前诊断为高级别上皮内瘤变的腺瘤中,80例(89.9%)术后病理确定是腺癌;在低级别上皮内瘤变中亦有29例(39.7%)术后确定为浸润性腺癌.在109例腺癌中2例伴有肝转移(MI),18例则有邻近组织浸润(T4).术后病理证实有局部淋巴结转移或见癌结节者26例(23.9%).结论 应重视结直肠上皮内瘤变的病理诊断,高度警惕高级别上皮内瘤变.在临床和内镜中疑为恶性的病变,若不涉及保肛问题,宜首选作病变肠段切除,如术中可确诊为浸润性癌,则应作根治性切除.     

结直肠上皮内瘤变的诊断意义与处理原则

目的 探讨结直肠上皮内瘤变病理诊断的临床意义和外科治疗的原则.方法 于2004年1月至2008年6月共收治术前经内镜活检、病理诊断为"上皮内瘤变"的病例共158例(共162个肿瘤),其中诊断为低级别上皮内瘤变73例,高级别上皮内瘤变89例.行腺瘤切除术5例,根治性结肠切除手术49例,直肠低位前切除术74例,经肛门局部切除术16例,Hartmann直肠经腹切除结肠造口术2例,腹会阴切除术4例,Parks结肠肛管吻合术7例,乙结肠造口术1例.经手术切除的标本常规作病理学检查,并与该患者的术前活检作比较,进行回顾性分析.结果 术后109例(67.3%)病理证实为浸润性腺癌,在89例术前诊断为高级别上皮内瘤变的腺瘤中,80例(89.9%)术后病理确定是腺癌;在低级别上皮内瘤变中亦有29例(39.7%)术后确定为浸润性腺癌.在109例腺癌中2例伴有肝转移(MI),18例则有邻近组织浸润(T4).术后病理证实有局部淋巴结转移或见癌结节者26例(23.9%).结论 应重视结直肠上皮内瘤变的病理诊断,高度警惕高级别上皮内瘤变.在临床和内镜中疑为恶性的病变,若不涉及保肛问题,宜首选作病变肠段切除,如术中可确诊为浸润性癌,则应作根治性切除.     

结直肠上皮内瘤变的诊断意义与处理原则

目的 探讨结直肠上皮内瘤变病理诊断的临床意义和外科治疗的原则.方法 于2004年1月至2008年6月共收治术前经内镜活检、病理诊断为"上皮内瘤变"的病例共158例(共162个肿瘤),其中诊断为低级别上皮内瘤变73例,高级别上皮内瘤变89例.行腺瘤切除术5例,根治性结肠切除手术49例,直肠低位前切除术74例,经肛门局部切除术16例,Hartmann直肠经腹切除结肠造口术2例,腹会阴切除术4例,Parks结肠肛管吻合术7例,乙结肠造口术1例.经手术切除的标本常规作病理学检查,并与该患者的术前活检作比较,进行回顾性分析.结果 术后109例(67.3%)病理证实为浸润性腺癌,在89例术前诊断为高级别上皮内瘤变的腺瘤中,80例(89.9%)术后病理确定是腺癌;在低级别上皮内瘤变中亦有29例(39.7%)术后确定为浸润性腺癌.在109例腺癌中2例伴有肝转移(MI),18例则有邻近组织浸润(T4).术后病理证实有局部淋巴结转移或见癌结节者26例(23.9%).结论 应重视结直肠上皮内瘤变的病理诊断,高度警惕高级别上皮内瘤变.在临床和内镜中疑为恶性的病变,若不涉及保肛问题,宜首选作病变肠段切除,如术中可确诊为浸润性癌,则应作根治性切除.     

结直肠上皮内瘤变的诊断意义与处理原则

目的 探讨结直肠上皮内瘤变病理诊断的临床意义和外科治疗的原则.方法 于2004年1月至2008年6月共收治术前经内镜活检、病理诊断为"上皮内瘤变"的病例共158例(共162个肿瘤),其中诊断为低级别上皮内瘤变73例,高级别上皮内瘤变89例.行腺瘤切除术5例,根治性结肠切除手术49例,直肠低位前切除术74例,经肛门局部切除术16例,Hartmann直肠经腹切除结肠造口术2例,腹会阴切除术4例,Parks结肠肛管吻合术7例,乙结肠造口术1例.经手术切除的标本常规作病理学检查,并与该患者的术前活检作比较,进行回顾性分析.结果 术后109例(67.3%)病理证实为浸润性腺癌,在89例术前诊断为高级别上皮内瘤变的腺瘤中,80例(89.9%)术后病理确定是腺癌;在低级别上皮内瘤变中亦有29例(39.7%)术后确定为浸润性腺癌.在109例腺癌中2例伴有肝转移(MI),18例则有邻近组织浸润(T4).术后病理证实有局部淋巴结转移或见癌结节者26例(23.9%).结论 应重视结直肠上皮内瘤变的病理诊断,高度警惕高级别上皮内瘤变.在临床和内镜中疑为恶性的病变,若不涉及保肛问题,宜首选作病变肠段切除,如术中可确诊为浸润性癌,则应作根治性切除.     

结直肠上皮内瘤变的诊断意义与处理原则

目的 探讨结直肠上皮内瘤变病理诊断的临床意义和外科治疗的原则.方法 于2004年1月至2008年6月共收治术前经内镜活检、病理诊断为"上皮内瘤变"的病例共158例(共162个肿瘤),其中诊断为低级别上皮内瘤变73例,高级别上皮内瘤变89例.行腺瘤切除术5例,根治性结肠切除手术49例,直肠低位前切除术74例,经肛门局部切除术16例,Hartmann直肠经腹切除结肠造口术2例,腹会阴切除术4例,Parks结肠肛管吻合术7例,乙结肠造口术1例.经手术切除的标本常规作病理学检查,并与该患者的术前活检作比较,进行回顾性分析.结果 术后109例(67.3%)病理证实为浸润性腺癌,在89例术前诊断为高级别上皮内瘤变的腺瘤中,80例(89.9%)术后病理确定是腺癌;在低级别上皮内瘤变中亦有29例(39.7%)术后确定为浸润性腺癌.在109例腺癌中2例伴有肝转移(MI),18例则有邻近组织浸润(T4).术后病理证实有局部淋巴结转移或见癌结节者26例(23.9%).结论 应重视结直肠上皮内瘤变的病理诊断,高度警惕高级别上皮内瘤变.在临床和内镜中疑为恶性的病变,若不涉及保肛问题,宜首选作病变肠段切除,如术中可确诊为浸润性癌,则应作根治性切除.     

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 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.     

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.     

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.     

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.     

Dilemma of Membrane Biocompatibility and Reuse

Abstract: Numerous articles have been published on the multiple use of dialyzers and on the effect of different reprocessing chemicals and techniques on the dialyzer biocompatibility and performance. The results often appear contradictory, especially those comparing standard biocompatibility parameters. Despite this confusion, a discerning review of the published works allows certain limited conclusions to be drawn. Reprocessing of used hemodialyzers changes the biocompatibility profile of a dialyzer as defined by the parameters complement activation. leukopenia, and cytokine release. The effect of reprocessing depends on the chemicals and reprocessing technique applied and also on the type of membrane polymer being subjected to the reprocessing procedure. Reports of pyrogenic reactions indicate that the flux of the membrane also influences how suitable it is for safe reuse. An increased risk of allergic and pyrogenic reactions appears to be associated with dialyzer reuse. Furthermore, there has been a lack of investigations into the immunologic effect of the layer of adsorbed and chemically altered proteins that remains on the inner surface of reprocessed dialyzers. We conclude that the clinical benefit of dialyzer reuse cannot be generally accepted from a biocompatibility point of view.