支撑捆扎套入法结肠-肛管吻术(Povrk)在低位或超低位直肠癌保肛手术中的应用

目的:介绍用支撑捆扎套入法结肠肛管吻合术(Povrk)在保留齿状线和肛门内括约肌的低位或超低位直肠癌中的应用方法。方法:37例低位直肠癌在术前放疗,在全直肠系膜切除基础上用支撑套入法结肠肛管吻合术完成手术,术后予希罗达口服化疗。结果:本组37例无死亡病例。近期吻合口瘘2例,均引流后治愈,直肠癌距肛门4～7cm术后排便功能恢复好。结论:支撑法结肠肛管吻合术用于低位直肠癌保肛手术可作为双吻合器保肛手术的替代或改良方法以应用。     

全直肠系膜切除支撑捆扎法低位或超低位结肠-直肠(肛管)吻合术

目的介绍在全直肠系膜切除基础上用支撑捆扎法完成低位直肠癌低位或超低位结肠-直肠(肛管)吻合手术术式。方法对346例低位直肠癌在全直肠系膜切除和根治性清扫基础上,用支撑捆扎法进行保留肛门括约肌手术,对直肠断端距齿状线≥1cm者用改良Welch手术完成结肠-直肠吻合术;直肠断端距齿状线≤1cm者行保留肛门内括约肌的结肠-肛管吻合术。结果本组346例手术中无死亡病例,术后近期出现吻合口漏4例(1·2%),局部引流2周治愈2例、横结肠造口转流2例,无吻合口出血。吻合口距离齿状线距离:2~3cm者114例,1~2cm者145例,0~1cm者87例。术后吻合口狭窄10例,狭窄率2·9%。Lifetable法计算5年生存率和局部复发率分别为78·6%及6·3%。手术后3个月排便功能的优良率为82·6%。结论支撑捆扎法用于低位直肠癌保肛手术可以完成耻骨直肠肌上缘到肌间沟平面的吻合,吻合口漏和吻合口狭窄发生率较低。     

支撑捆扎法在腹腔镜下全直肠系膜切除超低位结肠-直肠/肛管吻合术中的应用

目的 介绍支撑捆扎法在腹腔镜下对低位直肠癌进行全直肠系膜切除(TME)超低位结肠．直肠／肛管吻合的手术方法。方法 应用超声刀在腹腔镜下对11例低位直肠癌患实施TME原则的根治性切除，用支撑捆扎法完成超低位结肠．直肠／肛管吻合术。结果 11例患术中直肠系膜切除完整。超低位结肠-直肠／肛管吻合成功，吻合时间15—30min；吻合口距齿状线小于2cm8例。结肠与齿状线处肛管吻合的3例。术后恢复顺利。肛门括约肌功能、排尿功能良好，未发生吻合口瘘与吻合口狭窄。结论 腹腔镜结合支撑捆扎法可以对低位直肠癌行TME切除后进行超低位结肠-直肠／肛管吻合术。     

支撑捆扎法在超低位直肠癌保留肛门括约肌手术中的应用

目的探讨支撑捆扎法在超低位直肠癌保留肛门括约肌手术中的应用。方法对117例直肠癌患者采用支撑捆扎法完成超低位结肠-直肠(肛管)吻合术。患者均在术前行纤维结肠镜检查和活组织检查,确诊为直肠腺癌,且经直肠腔内B超、盆腔CT及MR I排除肿瘤侵犯肛提肌和盆腔淋巴结广泛转移。结果117例超低位直肠癌保肛手术围手术期呼吸衰竭死亡1例,术后吻合口漏2例,1例局部引流治愈,1例直肠阴道瘘行横结肠造瘘转流手术。未发生吻合口狭窄,术后3月排便功能评价:优29例,良44例,一般31例,差13例,优良率为62.4%(73/117)。结论支撑捆扎法用于直肠癌保留肛门括约肌手术安全、可行,可以完成从肛提肌内口到括约肌间沟的结肠-直肠(肛管)吻合,效果良好。     

支撑捆扎法在低位直肠癌超低位前切除术中的应用

目的介绍一种新的直肠癌保留肛门括约肌手术术式,即支撑捆扎法低位(超低位)结肠-直肠(肛管)吻合术。方法回顾性分析近12年来采用支撑捆扎法进行直肠癌保留肛门手术(保肛组)310例的临床资料。结果全组肿瘤距离肛缘的平均距离为(4.7±1.2)cm。TNM分期:Ⅰ期40例,Ⅱ期130例,Ⅲ期109例,Ⅳ期31例。吻合口距肛缘平均距离为2cm(1～4cm)。术后吻合口漏发生率2.3%,肛门括约肌控制力优良率为82.25%。中位随访时间为84个月(12～186个月),310例患者中5年内有18例局部复发,局部复发率为5.8%。全组中位生存时间(57.8±2.739)个月,平均生存时间(67.494±1.738)个月。结论支撑捆扎法是一种安全、可行的直肠癌保留肛门括约肌的手术技术,可以完成从肛提肌内口到括约肌间沟的结肠-直肠(肛管)吻合术,不影响肿瘤的根治原则、远期效果良好。     

支撑捆扎法回肠Pouch-直肠肌鞘内肛管一期吻合术

目的 探讨用肛门支撑吻合管支撑捆扎法进行回肠囊袋（Pouch）－直肠肌鞘内肛管一期吻合术，并分析该术式对结、直肠息肉病、溃疡性结炎治疗的价值。方法 对结、直肠息肉病行全结肠及上段直肠切除，保留齿状线上4－6cm直肠。距齿状线处2cm剥离直肠粘膜。回肠“J”型、“S”型、“W”型Pouch内置入肛门支撑吻合管8cm，结扎－缝扎、固定。距直肠粘膜残端1cm处用2号肠线全层内荷包缝合一周，在直肠肌鞘套内回肠Pouch与外科肛管吻合。溃疡性结肠炎直肠肌鞘内与解剖肛管吻合。结果 一期完成手术，吻合口愈合良好。无肌间血肿，无吻合口漏及吻合口狭窄。术后6个月排便功能优良率达88.8%，随访1－5年未发现息肉复发。结论 全结肠及部分直肠切除后用支撑捆扎法行一期手术即可完成回肠Pouch-直肠肌鞘内肛管吻合术，保留肛管直肠移行区的回肠Pouch外科肛管吻合术优于回肠Pouch解剖肛管吻合术。     

内括约肌切除术治疗超低位直肠肿瘤26例

目的 总结用肛门内括约肌切除术治疗超低位直肠肿瘤的临床经验.方法 对26例无外括约肌受侵的低位直肠肿瘤患者行全直肠系膜切除加经肛内括约肌切除术的临床资料进行回顾性分析.对肿瘤下缘距齿状线 2 cm者,行内括约肌部分切除;肿瘤下缘距齿状线 1.0 cm、<2.0 cm者,行内括约肌次全切除;肿瘤距齿状线<1.0 cm或侵及齿状线者,行内括约肌全切除,结肠肛管行端端吻合.结果 26例患者肿瘤下缘距齿状线距离为0～3 cm.病理类型:高分化腺癌6例,中分化腺癌16例.乳头状癌1例,绒毛状腺瘤癌变1例.巨大绒毛状腺瘤2例.病理分期:pTNM Ⅰ期11例,ⅡA期8例,ⅢA期4例,ⅢB期1例;T分级:T1 8例,T2 15例,13 1例.全组无手术死亡;无吻合口瘘;发生吻合口狭窄2例.术后早期肛门经常粪污,每日大便3～10次.术后1年控便时间可达5 min以上,患者排便次数减少,最少为每日1次,或每日2～4次.但内括约肌全切除者仍偶然粪污.术后平均随访时间28个月,术后5个月吻合口肿瘤复发1例,术后10个月肝转移1例,术后26个月心源性猝死1例.结论 对于癌灶局限于直肠壁内的超低位直肠癌,采用肛门内括约肌切除术可以达到根治效果,并保留肛门功能.     

低位直肠癌行乙状结肠齿状线吻合的保肛术的临床应用

目的：探讨低位直肠癌保留肛门括约肌功能的最佳治疗术式。方法：经腹和肛门齿状线切除直肠下段癌，行乙状结肠与肛管齿状线吻合22例。结果：全组无手术死亡，无吻合口漏和吻合口狭窄。术后随访11个月至5年，平均随访时间3年1个月。术后10～12周对排气和干大便控制良好，无大便失禁者。3例Dukes C1期于术后14、18个月和23个月死于远处转移，无局部复发病例。结论：根据直肠肿瘤临床分期和肿瘤生物学行为选择手术适应证。经腹、肛门齿线联合切除根治下段直肠癌，行乙状结肠与肛管齿状线吻合术是一种良好的保肛术式。     

套入式结肠直肠黏膜吻合术治疗低位直肠癌86例的临床研究

目的 探讨低位直肠癌保留肛门括约肌功能最理想的治疗术式。方法 对86例低位直肠癌切除后经肛门行套入式结肠直肠黏膜吻合术。肿瘤下缘距肛缘6－7cm 62例，8－10cm 24例。结果 全组无手术死亡，无吻合口瘘和吻合口狭窄发生。术后8－12周时排便功能控制良好，排便次数为1－4次／d，18周时肛门排便功能基本恢复正常，排便次数为1－2次／d。术后随访3个月至8年，总的局部复发率为3．7％（3／81），总的5年生存率为66．7％（14／21）。结论 套入式结肠直肠黏膜吻合术可避免腹部结肠造口，并防止吻合口瘘的发生，作为低位直肠癌保肛手术，是一种安全的术式。     

低位直肠癌前切除超低位吻合手术应用体会（附23例报告）

目的探讨低位直肠癌前切除超低位吻合手术的应用及效果。方法通过经腹游离至提肛肌后,完整切除直肠系膜,保留盆腔植物神经,分离耻骨直肠肌、外括约肌深部与内括约肌间隙,游离外括约肌全层达齿状线。采用双吻合技术,切除直肠及部分内括约肌,完成吻合。结果 23例低位直肠癌成功的完成了前切除超低位吻合保留肛门的手术,2例吻合口漏,1例局部复发,1例腰椎转移。控便情况：完全自制7例,便频12例,排气失禁2例,偶尔漏稀便2例。结论低位直肠癌前切除超低位吻合,达到了根治的目的,成功保留了肛门及功能,提高了生活质量,效果满意。     

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.     

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.     

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.     

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.     

Intraoperative autotransfusion is associated with modest reduction of allogeneic transfusion in prosthetic hip surgery

Background: The efficacy of intraoperative salvage and washing of wound blood and the predictors of allogeneic red cell transfusions in prosthetic hip surgery are insufficiently known.
Methods: In 96 patients, undergoing primary or revision surgery, salvaged and washed red cells and, if necessary, allogeneic blood were used to keep haematocrit not lower than 33%. The bleeding of red cells during hospital stay was calculated from the red cell balance. The preoperative red cell reserve (millilitres of red cells in excess of a haematocrit of 33%) was estimated and the difference between this volume and the total bleeding of red cells was retrospectively used to classify patients with regard to the need for red cells. Stepwise regression analysis was used to define patient-related variables associated with allogeneic blood transfusion.
Results: Preoperative knowledge of the type of operation (primary, revision), the preoperative red cell reserve, and the body mass could predict roughly half of the need for banked blood (r²=0.45). Only one-third of the total bleeding of red cells was retransfused. For complete avoidance of allogeneic blood, autotransfusion was most effective in patients with a moderate need (0–4 u). However, 32% of such patients required allogeneic blood.
Conclusions: Autotransfusion has a limited efficacy to decrease the need for allogeneic blood, and other blood-saving methods should be added for this purpose. It is difficult to predict the need for allogeneic blood preoperatively.     

缺氧对肾小管上皮细胞分泌外泌体的影响

目的    观察缺氧对肾小管上皮细胞分泌外泌体的影响,探讨外泌体在缺氧致肾脏损伤中的作用及机制。 方法    （1）常氧（21% O₂）及缺氧（1% O₂）分别处理大鼠肾小管上皮细胞（NRK-52E）48 h,收集细胞上清液并使用高速梯度离心法分离外泌体。采用透射电镜、纳米示踪分析、Western印迹、蛋白浓度定量鉴定并比较两组外泌体的基本特性。（2）在共培养实验中,以不同浓度（1、10、50、100、300 mg/L）的常氧外泌体、缺氧外泌体分别干预脂多糖（LPS）诱导的大鼠原代腹腔巨噬细胞,使用实时荧光定量PCR与酶联免疫吸附试验（ELISA）法分别检测巨噬细胞白细胞介素6（IL-6）、肿瘤坏死因子α（TNF-α）、诱导型氮氧化物合酶（iNOS）水平;使用Western印迹法检测巨噬细胞磷酸化（p）STAT/STAT及细胞因子信号传导抑制蛋白1（SOCS1）的蛋白表达;最后,使用实时荧光定量PCR法检测常氧外泌体与缺氧外泌体中炎性反应相关微RNA（microRNA,miR）的表达差异。 结果    （1）离心得到的囊泡具有外泌体典型的结构,粒径小于150 nm,表达外泌体标志蛋白CD63,说明分离得到外泌体。缺氧对肾小管上皮细胞分泌的外泌体形态、粒径分布比例无明显影响,但提高了外泌体的分泌量。（2）缺氧外泌体相比于常氧外泌体促进了LPS诱导的M1型巨噬细胞IL-6、TNF-α、iNOS 的表达和分泌（均P＜0.01）,同时提高STAT的磷酸化水平并减少SOCS1的蛋白表达（均P＜0.01）;对炎性反应相关microRNA检测发现缺氧外泌体中miR-155、miR-27a表达量较常氧外泌体明显升高（P＜0.05）。 结论    缺氧可改变外泌体的生物学功能,表现为协同促进LPS诱导的M1型巨噬细胞的表型转化,这可能是慢性肾脏病微炎性反应状态持续的原因之一。     

In Vitro Function and Durability Assessment of a Novel Polyurethane Heart Valve Prosthesis

Abstract While flexible-leaflet, central-flow prosthetic heart valves promise relief from anticoagulation therapy, they continue to be restricted by inadequate durability. In consequence, a novel trileaflet valve, made entirely from polyurethane, has been developed. A batch of 6 consecutively manufactured polyurethane valves was subjected to hydrodynamic function and accelerated fatigue testing. Computerized data acquisition and control systems have been introduced to improve valve testing methodologies. In terms of hydrodynamic function, the polyurethane valve demonstrates transvalvular pressure gradients similar to those for a bioprosthetic valve (Carpentier-Edwards) and levels of retrograde flow significantly less than those for either the bioprosthetic valve or a bileaflet mechanical valve (St Jude Medical). The equivalent of 10 years of cycling without failure has been exceeded by all 6 polyurethane valves in accelerated fatigue tests with 2 valves remaining intact after 674 million cycles (equivalent to approximately 17 years) in continuing tests. Highspeed photography revealed considerable differences in leaflet motion between valves cycled at accelerated and physiological rates.     

Negative pressure ventilation vs. spontaneous assisted ventilation during rigid bronchoscopy: A controlled randomised trial

Background: Ventilation during interventional rigid bronchoscopy (IRB) under general anaesthesia (jet ventilation, positive pressure ventilation and spontaneous assisted ventilation) may offer some difficulties. This study compares the effectiveness during IRB of intermittent negative pressure ventilation (INPV) and spontaneous assisted ventilation (SAV). Methods: Thirty-eight patients submitted to IRB were randomised into two groups: SAV or INPV. All patients received a total intravenous anaesthesia; INPV patients were paralysed. Pre-and intra-operative arterial blood gases and O₂ flow through a rigid bronchoscope were assessed. The endoscopist applying a subjective score evaluated the operating conditions. Results: Patients of the INPV group, as compared to the SAV group, required a lower dosage of fentanyl (2.6 ± 1.8 (μg · kg^?1· h^?1 vs. 6.6 ± 4.8 μg · kg^?1· h^?1), a lower O₂ supply (3.3 ± 2.8 1/min vs. 11.6 ± 3.4 1/min), a shorter recovery time (5.4 ± 2.9 min vs. 9.8 ± 7.1 min) and no manually assisted ventilation (0 ± 0 vs. 1 ± 1.1 nd?/procedure). Intraoperative PaCO₂ was higher in the SAV (8.1 ± 1.3 kPa) than in the INPV group (5.0 ± 1.6 kPa) and intraoperative pH differed in the two groups (7.26 ± 0.05, SAV vs. 7.47 ± 0.08, INPV). Operating conditions, as assessed by a subjective score, were considered better with INPV than with SAV (4.9 vs. 4.3). Conclusions: As compared to SAV, INPV in paralysed patients during IRB reduces administration of opioids, shortens recovery time, prevents respiratory acidosis, excludes the need for manually assisted ventilation, reduces 02 need and affords optimal surgical conditions. INPV appears a safe, non-invasive and effective ventilatory management during IRB.