高压氧对缺血性脑卒中C-反应蛋白的影响

目的探讨高压氧对缺血性脑卒中C-反应蛋白（CRP）水平的影响，为评价高压氧对治疗缺血性脑卒中的效果提供依据。方法选择CRP水平异常（CRP〉8mg／L）的急性缺血性脑卒中住院患者，再根据性别、年龄、危险因子（吸烟、高血压、糖尿病、高脂血症）进行配对，共选择有效病例25对，分为高压氧-药物综合治疗组（HBO组）和药物治疗组（对照组），于治疗前后抽取静脉血检测CRP水平，并按临床神经功能缺损程度评定标准评分，比较所得结果。结果HBO组治疗后，CRP水平明显低于治疗前（P〈0．01），亦明显低于对照组（P〈0．01）；CNFDS评分明显低于对照组（P〈0．01）。结论高压氧能显著降低患者CRP水平，改善缺血性脑卒中患者的预后。     

Clinical case report: treatment of a central retinal vein occlusion with hyperbaric oxygen.

A case of retinal central vein occlusion (CRVO) in a 43-year-old man is presented in which hyperbaric oxygen (HBO2) was used as the only treatment method. CRVO is a relatively common cause of visual loss, with hypertension, diabetes, glaucoma and hypercoagulable conditions identified as risk factors. The patient in this report had none of these risk factors and declined treatments other than hyperbaric oxygen. HBO2 was effective in sustaining the ischemic retina and controlling retinal edema until the retina revascularized and vision stabilized. The initial visual acuity in the left eye was 20/200 (corrected), and after two hyperbaric treatments it was 20/30 (corrected). Following three months of HBO2 treatments the vision stabilized to 20/20 (corrected) in the affected eye. Treatment considerations in using HBO2 as adjunctive therapy for CRVO are early institution of treatment, and continuation of HBO2 until the retinal edema has resolved and vision has stabilized.     

中医辨证施治联合静脉给氧对前部缺血性视神经病变ERG和VEP的影响

目的　探讨中医辨证施治联合静脉给氧对前部缺血性视神经病变视网膜电图 (ERG)和视觉诱发电位 (VEP)的影响。方法　依据病史、眼底表现、视野检查及荧光素眼底血管造影确诊为“前部缺血性视神经病变”的患者 44例 60只眼 ,随机分为观察组 2 4例及对照组 2 0例。观察组在与对照组治疗完全相同的基础上加用中医辨证施治及静脉给氧。结果　反应视网膜供血的OPS观察组与对照组比较有显著性差异 (P <0 .0 5 ) ,VEP之P10 0波潜时在高空间频率时两组比较有显著性差异 (P <0 .0 5 ) ,其余指标无明显差异 ;观察组与治疗前比较有明显改善 (P <0 .0 5 ) ,但与正常组比较仍有显著差距。结论　中医辨证施治联合静脉给氧对缺血性视神经病变OPS及VEP振幅有明显的改善作用 ,但该病视功能损害严重 ,治疗很难使电生理指标恢复到正常水平     

高压氧合并牛磺酸对缺血性脑损伤的保护作用

目的 :探讨高压氧合并牛磺酸对沙土鼠脑缺血再灌流皮层神经元损伤的保护作用。方法 :采用沙土鼠双侧颈总动脉夹闭 30min再灌流模型。应用病理及组织化学方法观察高压氧合并牛磺酸对缺血性神经细胞坏死及凋亡的影响。结果 :脑缺血 30min再灌流第 3d ,沙土鼠脑皮层组织间隙水肿 ,神经细胞坏死并凋亡同时存在。高压氧 (0 2MPa)暴露第3d ,组织间隙水肿消退 ,神经胶质细胞增生。高压氧 (0 2MPa)合并牛磺酸 (0 1g/kg)治疗第 3d,神经元坏死与凋亡数目明显减少。结论 :高压氧合并牛磺酸治疗对缺血性脑损伤具有双重保护作用     

脑SPECT显像对高压氧治疗脑外伤后脑缺血疗效判断的价值

目的探讨SPECT脑血流灌注显像对高压氧（HBO）治疗脑外伤继发脑缺血患者疗效判断的价值。方法将65例脑外伤继发脑缺血患者按随机数字表法分为HBO治疗组和常规治疗组,在治疗前后分别进行脑血流灌注SPECT显像,应用计算机感兴趣区（ROI）技术,在横断面图像上采用局部镜像比值（Ra）法判断脑缺血病灶,Ra≤0．9视为异常。对治疗前后的脑血流灌注减低区Ra值进行比较。数据间的比较行t检验。结果HBO治疗组治疗前后局部脑血流（rCBF）减低区Ra值分别为0．58±0．11和0．82±0．12（t=7．327,P〈0．01）,常规治疗组治疗前后rCBF减低区Ra值分别为0．61±0．13和0．73±0．12（t=2．153,P=0．038）;HBO治疗组和常规治疗组缺血灶rCBF增加值分别为0．24±0．08和0．12±0．06（t=2．571,P=0．015）。结论SPECT脑血流灌注显像可灵敏地反映HBO治疗脑外伤后脑缺血前后rCBF变化,可用于HBO治疗疗效的评价。     

Improvement of clinical outcome and cerebral perfusion in a patient of atherosclerotic cerebral infarction after repetitive hyperbaric oxygen treatment--a case report and literature review

This is a case report of hyperbaric oxygen therapy (HBO2T) for ischemic stroke. HBO2T should be the potential or additional treatment (with thrombolytic therapy) for ischemic stroke according to the preclinical and clinical studies. Hereby, we present a 56-year-old Chinese man with vascular risk factors. He had an acute ischemic stroke on the left corona radiata, with right hemiparesis and dysarthria resulting from atherosclerosis. The patient could not get thrombolytic treatment because the time to ER was in excess of five hours. He experienced great improvement after the general course of HBO2T; this was evaluated with standard rating scales for stroke research and cerebral perfusion images, including brain-computed tomography perfusion (CTP) and single-photon emission computed tomography (SPECT). Although few clinical trials showed a negative result, we suggest that further trials on HBO2T are still needed. Meanwhile, we emphasize the importance of HBO2T protocol and the selection of a suitable patient, which may influence the outcome.     

高压氧对兔缺血皮瓣模型组织灌注的影响

目的 探索高压氧(HBO)对缺血皮瓣组织灌注的影响.方法 用12只新西兰大白兔建立曾经为文献证实有效的缺血动物皮瓣模型.其中6只兔小进行HBO治疗作为手术对照组.HBO治疗方案为在0.2 MPa压力下吸100%氧气45 min.应用激光多普勒血流仪和经皮测氧仪在手术后即刻、第3天和第7天测定皮瓣的血流、经皮氧分压和二氧化碳分压.用图像分析系统在手术后第3天和第7天评价皮瓣的坏死程度.在术后第3天和第7天切取缺血的皮瓣组织,制成组织切片,HE染色测定新生毛细血管数目.结果 在手术后第3天和第7天,与相应的对照组比较,HBO治疗组的皮瓣坏死面积明显减小(P＜0.05);和对照组比较,在手术后第3天和第7天HBO治疗组皮瓣血流和经皮氧分压明显升高,经皮二氧化碳分压明显降低,差异均有统计学意义(P＜0.05);此外,与相应的对照组比较,皮瓣组织学分析显示HBO组新生毛细血管数目明显增高(P＜0.05).结论 本研究证实,HBO可以促进皮瓣的存活,在挽救缺血皮瓣的过程中,HBO在供给充分的分子氧、促进二氧化碳的排出、促进新生毛细血管的形成、改善皮瓣血流等方面起着重要的作用.     

Effects of formalin fixation on magnetic resonance indices in multiple sclerosis cortical gray matter

Purpose

To characterize and evaluate functional and anatomic changes of visual pathway lesions during hyperbaric oxygen (HBO) treatment with blood‐oxygenation‐level‐dependent functional MRI (BOLD‐fMRI) and diffusion tensor imaging (DTI).

Materials and Methods

Sixteen patients with visual pathway lesions received HBO treatment. Both BOLD‐fMRI and DTI were performed before and after the treatment, while 12 healthy subjects were also studied with 2 examinations as control. The t‐tests were used for the comparison of number of activated voxels (AVs) and fractional anisotropy (FA) between the two groups, and within the patient group before and after HBO treatment. Visual acuity of the patient group before and after the treatment was compared using Wilcoxon signed‐rank test.

Results

Before the treatment, both AVs (P < 0.01) and FA (P < 0.05) in the bilateral cortexes of occipital lobes were significantly less in the patient group than in the control group. After the treatment, both AVs (P < 0.05) and FA (P < 0.05) were significantly increased. Moreover, The FA of 6 patients with lesions in the optical nerve was greater than the FA of the other 10 patients with lesions in the optic radiation (P < 0.05).

Conclusion

BOLD‐fMRI combined with DTI was useful for the characterization and evaluation of anatomic and functional changes of visual pathway lesions and their development during HBO treatment. J. Magn. Reson. Imaging 2010;31:1054–1060. © 2010 Wiley‐Liss, Inc.     

高压氧下大鼠脑组织中氧化氮合酶阳性细胞的表达(论著)

目的：探讨高压氧（HBO）对视觉中枢的影响。方法：SD大鼠12只，随机分为3组：分别为常压对照组（NP组），高压空气对照组（HBA组），和HBO实验组（HBO组）。HBA组和HBO组动物分别给予0．25MPa高压空气和纯氧，升压20分钟，在0．25MPa下稳压4小时，然后经20分钟减至常压。动物出舱后立即灌注取脑，利用NADPH-黄递酶（NADPH-diaphorase）组织化学方法，观察氧化氮合酶（NOS）阳性细胞见脑组织外侧膝状体（LGN）、视皮层及大脑顶叶皮层的表达。结果：NOS阳性细胞存在于大鼠LGN、视皮层及大脑项叶皮层中。在0．25MPaHBO作用下，视皮层、大脑顶叶皮层中NOS阳性细胞明显增加（P＜0．05），而LGN与对照组相比无显著性差异（P＞0．05）。结论：HBO对视觉中枢的毒性作用与视皮层NOS阳性细胞增加密切相关。     

高压氧治疗新生儿缺氧缺血性脑病疗效观察

目的 :探讨高压氧 (HBO)治疗新生儿缺氧缺血性脑病 (HIE)的疗效。方法 :1 1 6例HIE患儿 ,分为治疗组 (65例 ) ,对照组(51例 ) ,二组均采用纠正酸中毒、控制脑水肿及惊厥 ,静脉滴注脑活素等综合治疗 ,治疗组则加用HBO治疗。结果 :治疗组与对照组总有效率分别为 98.46 % ,74.51 %。经统计学处理P <0 .0 1 ,有显著性差异。结论 :HBO治疗HIE能缩短病程 ,提高治愈率 ,降低死亡率 ,减少后遗症的发生 ,HIE患儿应尽早行HBO治疗。     

Hyperbaric oxygen for neurologic indications--action plan for multicenter trials in: stroke, traumatic brain injury, radiation encephalopathy & status migrainosus

The 2008 Toronto Hyperbaric Medicine Symposium was convened to discuss research into neurologic indications for hyperbaric oxygen therapy (HBO2T). Four topics were particularly addressed: acute ischemic stroke; acute traumatic brain injury; brain radiation necrosis; and status migrainosus. Four multicenter trials were designed and proposed to evaluate the efficacy of HBO2T for these indications and are presented here in addition to brief reviews of the rationale behind each.     

高压氧和抗血小板聚集剂预防一氧化碳中毒迟发脑病

目的 观察高压氧（HBO）和抗血小板聚集剂综合疗法对一氧化碳中毒（COP）迟发脑病的预防效应。方法 中，重度急性一氧化碳中毒患者共401例，随机分成HBO治疗组（HBO）组204例和HBO＋抗血小板聚集剂治疗组（HBO＋抗Pla组）197例。HBO治疗压力0.2MPa，每日1次，共20次，在患者COP后第15，20，25，30，45，60天判定是否出现迟发脑病。结果 COP患者401例中，HBO组204例，出现迟发脑病23例，占11．27％。HB＋抗Pla组197例，出现迟发脑病7例，占3．55％。两组比较差异有非常显著性（P＜0．01）。结论 HBO和抗血小板聚集剂综合治疗急性COP，使其迟发脑病的发生率较单纯HBO治疗明显降低，取得显著的预防效应。     

应用SPECT评价高压氧对新生儿缺氧缺血性脑病的疗效及其治疗机制的研究

目的　应用ＳＰＥＣＴ评价高压氧（ＨＢＯ）对新生儿缺氧缺血性脑病（ＨＩＥ）的疗效并探讨其治疗机制。方法　研究对象为３４ 例新生儿,分为正常新生儿组３ 例,ＨＢＯ 组ＨＩＥ患儿２０ 例和对照组ＨＩＥ患儿１１例。正常新生儿在出生后５～８ 天内进行１次ＳＰＥＣＴ检查作为比较。两组ＨＩＥ患儿分别在治疗前和治疗后各接受一次ＳＰＥＣＴ检查。结果　治疗前３１ 例ＨＩＥ患儿ＳＰＥＣＴ示有４６ 个大小不同的局灶性血流灌注低下区和功能缺损。ＨＢＯ组ＨＩＥ患儿经１～２ 个疗程的ＨＢＯ治疗后,脑内原有局灶性血流灌注低下区和功能缺损缩小或消失。对照组的ＨＩＥ患儿虽也有一定好转,但恢复程度不及ＨＢＯ组,两组之间的疗效有非常显著性差异（Ｐ＜ ０．０１）。结论　ＨＢＯ治疗ＨＩＥ患儿疗效显著,其机制可能主要是通过增加脑组织局部血流灌注和含氧量,改善脑细胞的缺氧状态,激发脑细胞的活性,促进损伤脑细胞的修复     

高压氧联合盐酸纳洛酮对重型颅脑损伤后昏迷患者的疗效分析

目的 探讨高压氧(hyperbaric oxygen,HBO)联合盐酸纳洛酮对重型颅脑损伤后昏迷患者的临床疗效.方法 299例重型颅脑损伤后昏迷患者按患方意愿分成HBO组(94例)、盐酸纳洛酮组(82例)、HBO+盐酸纳洛酮组(123例),在常规治疗的基础上,分别给予HBO、盐酸纳洛酮、HBO+盐酸纳洛酮进行相同疗程的治疗,观察治疗前后动态脑电图(EEG)、格拉斯哥昏迷量表(GCS)评分、格拉斯哥预后量表(GOS)评分、远期生活质量评估量表(KPS)评分的变化,并对数据进行统计学处理.结果 治疗3个月后,HBO+盐酸纳洛酮组的GCS评分(7.2±2.5)高于HBO组(6.5±2.1),2组比较差异有统计学意义(P<0.05);GOS评分(4.4±0.7)明显高于HBO组(4.1±0.8)及盐酸纳洛酮组(4.0±0.9),2组比较差异有统计学意义(P<0.01).治疗6个月后,HBO+盐酸纳洛酮组EEG功能分级高于盐酸纳洛酮组,2组比较差异有统计学意义(P<0.05);KPS评分明显高于HBO组及盐酸纳洛酮组,差异均有统计学意义(P<0.01).结论 HBO联合盐酸纳洛酮治疗重型颅脑损伤后昏迷患者较单纯应用HBO或盐酸纳洛酮治疗有更好的临床疗效.

Abstract：

Objective To investigate effect of HBO combined with naloxone hydrochloride in the treatment of coma following severe craniocerebral trauma.Methods Two hundred and ninety-nine patients with persisting coma following severe craniocerebral trauma were randomly divided into 3 groups: the hyperbaric oxygen group, the naloxone hydrochloride group and the HBO combined with naloxone hydrochloride group. On the basis of conventional therapy, patients were treated with HBO, or naloxone hydrochloride, or HBO combined with naloxone hydrochloride in the same course of treatment. Dynamic EEG, Glasgow coma scale (GCS) scores, Glasgow outcome scale (GOS) scores, long-term quality of Life Assessment Scale (KPS) scores were observed before and after treatment and statistical data were analyzed.Results After 3 months of treatment, GCS scores for the patients in the HBO combined with naloxone hydrochloride group were higher than those of the HBO group(P<0.05), and GOS scores for the patients in the HBO combined with naloxone hydrochloride group were significantly higher than those of the HBO group or the naloxone hydrochloride group. After 6 months of treatment, the EEG classification in patients of HBO combined with naloxone group was higher than that of the naloxone group, and KPS scores in patients of HBO combined with naloxone group were significantly better than those of the hyperbaric oxygen group and the naloxone hydrochloride group. After 6 months, the EEG classification, KPS scores for the patients in the HBO combined with naloxone hydrochloride group were significantly higher than those of the HBO group or the naloxone hydrochloride group(P<0.01).Conclusions HBO treatment combined with naloxone hydrochloride could produce better effect on patients with persistent coma following severe craniocerebral trauma, when comparisons were made with HBO and naloxone hydrochloride.     

高压氧对成年大鼠脑缺血再灌注损伤后脑血管内皮生长因子表达的影响

目的 探讨脑缺血模型大鼠经30 d高压氧(HBO)治疗后大脑血管内皮生长因子(VEGF)表达的变化.方法 24只成年SD大鼠随机分为3组:对照组(C组)8只、缺血再灌注组(IR组)8只、HBO治疗组(HBO组)8只.C组为正常大鼠,IR组和HBO组大鼠经大脑中动脉栓塞(MCAO)1.5 h后再灌注,HBO组行HBO治疗.HBO治疗(0.28 MPa,60 min)30 d,1次/d,于31 d麻醉处死,取脑组织切片,VEGF和CD34免疫组化染色,光镜观察并于损伤区取图,进行相关分析.结果 VECF广泛分布,缺血区表达强烈,3组间有明显差异(P＜0.05),HBO组(13497.14±397.44)低于IR组(22.097.7±616.89);C组未见CD34表达,其他2组集中表达于缺血区;HBO组(5571.16±603.63)表达少于IR组(5349.72±390.88),但差异无统计学意义(P＞0.05).结论 长期HBO治疗抑制大鼠缺血脑组织VEGF的表达,可能对神经细胞具有保护作用,有利于促进脑组织自我修复.     

高压氧治疗急性缺血性脑卒中近期疗效的系统评价

 目的评价高压氧(HBO)治疗急性缺血性脑卒中的近期疗效及安全性.方法使用国际Cochrane协作网的系统评价方法对全世界关于HBO治疗急性缺血性脑卒中的随机/半随机对照试验进行系统评价.结果至2001年12月,共收集到国内外23个已完成的RCTs,其中18个(共包括2 040例患者)试验,符合本研究的纳入标准.早期病死率降低(0 vs11.11%;OR 0.12;95%CI0.02～0.90;P<0.05),提示用HBO每治疗9人可避免约1人早期死亡;HBO治疗的副作用明显高于对照组(2.82%vs0;OR 5.54;95%CI 2.09～14.68;P<0.01);HBO治疗期末神经功能缺损改善的人数显著增加(94.88%vs79.18%:OR4.37;95%CI 3.30～5.77;P<0.01).结论HBO治疗急性缺血性脑卒中是一种有前途的治疗方法,但由于存在发表偏倚及RCTs普遍质量较低尚不能对HBO的疗效作出明确的结论,潜在的疗效及安全性有待于更多的设计严格的RCTs予以进一步证实.     

The Central Bright Spot Sign: A Potential New MR Imaging Sign for the Early Diagnosis of Anterior Ischemic Optic Neuropathy due to Giant Cell Arteritis

BACKGROUND AND PURPOSE:A rapid identification of the etiology of anterior ischemic optic neuropathy is crucial because it determines therapeutic management. Our aim was to assess MR imaging to study the optic nerve head in patients referred with anterior ischemic optic neuropathy, due to either giant cell arteritis or the nonarteritic form of the disease, compared with healthy subjects.MATERIALS AND METHODS:Fifteen patients with giant cell arteritis–related anterior ischemic optic neuropathy and 15 patients with nonarteritic anterior ischemic optic neuropathy from 2 medical centers were prospectively included in our study between August 2015 and May 2016. Fifteen healthy subjects and patients had undergone contrast-enhanced, flow-compensated, 3D T1-weighted MR imaging. The bright spot sign was defined as optic nerve head enhancement with a 3-grade ranking system. Two radiologists and 1 ophthalmologist independently performed blinded evaluations of MR imaging sequences with this scale. Statistical analysis included interobserver agreement.RESULTS:MR imaging scores were significantly higher in patients with giant cell arteritis–related anterior ischemic optic neuropathy than in patients with nonarteritic anterior ischemic optic neuropathy (P ≤ .05). All patients with giant cell arteritis–related anterior ischemic optic neuropathy (15/15) and 7/15 patients with nonarteritic anterior ischemic optic neuropathy presented with the bright spot sign. No healthy subjects exhibited enhancement of the anterior part of the optic nerve. There was a significant relationship between the side of the bright spot and the side of the anterior ischemic optic neuropathy (P ≤ .001). Interreader agreement was good for observers (κ = 0.815).CONCLUSIONS:Here, we provide evidence of a new MR imaging sign that identifies the acute stage of giant cell arteritis–related anterior ischemic optic neuropathy; patients without this central bright spot sign always had a nonarteritic pathophysiology and therefore did not require emergency corticosteroid therapy.

Anterior ischemic optic neuropathy (AION) is the most common acute optic neuropathy in individuals older than 50 years of age, with an incidence of 2–10 per 100,000 people per year.^1,2 AION results from ischemic events within the optic nerve; these may be related to systemic vasculitis affecting large- and medium-caliber vessels in the arteritic form, due to giant cell arteritis (GCA-AION) or to blood flow disturbances associated with nonarteritic ischemic optic neuropathy (NA-AION). A rapid identification of the etiology is crucial because it determines the therapeutic management; corticosteroids must be promptly administered in cases of GCA-AION. Establishing the diagnosis of giant cell arteritis (GCA) may be challenging. The histopathologic result of a temporal artery biopsy has been considered the diagnostic standard but should not delay the prompt institution of steroid therapy. Some clinical signs suggest an arteritic etiology, including amaurosis fugax and systemic symptoms; a marked deterioration of visual acuity; more extensive visual field defects; diplopia; and the findings of fundus examination and fluorescein or indocyanine green angiography.³ However, ophthalmologists require a rapid diagnostic test to definitively rule out this diagnosis in an emergency setting. In GCA-AION, the granulomatous inflammatory artery infiltrate consists of T-lymphocytes, macrophages, and multinucleated giant cells. The pathogenesis is still not fully understood, though there have been major advances in recent years. Cytotoxic mediators and growth factors trigger the remodeling of the arterial wall, leading to ischemic manifestations by luminal stenosis.⁴An MR imaging examination is often used to narrow the differential diagnosis of optic disc edema and to highlight retrobulbar optic nerve enhancement in optic neuritis, a differential consideration of AION.^5,6 In addition, imaging of branches of the external carotid artery may be useful in the diagnosis of GCA.⁷ In contrast, radiologic data have traditionally failed to obtain positive signs for diagnosing AION; the most common finding in these patients is brain leukoaraiosis, particularly in patients with the nonarteritic form of the disease.⁸ MR imaging is the technique of choice for studying subtle ischemic events, either with contrast media or diffusion imaging. However, diffusion-weighted MR imaging is prone to distortion and motion artifacts, which may be problematic for the study of the anterior optic pathway.We raised the hypothesis that cytotoxic ischemia is more pronounced in GCA-AION compared with NA-AION, potentially leading to more permeable vessels in the former. We further hypothesized that damage to the anterior optic nerve microcirculation at the acute stage of AION might be revealed by contrast-enhanced MR imaging through a focal enhancement of the optic nerve head, the “central bright spot sign.”     

高压氧治疗新生鼠缺氧缺血性脑病的病理学观察

目的：运用病理学手段观察高压氧治疗新生鼠缺氧缺血性脑病（HIE）疗效。方法：7d龄SD大鼠40只,结扎左侧颈总动脉,建立HIE模型,分为2组,一组给高压氧连续7d治疗,另一组为HIE对照组。7d后处死动物,观察大脑改变。结果：高压氧治疗组（HOB组）与损伤对照组（HIE组）都具有（1）神经元细胞变性,坏死;脑充血,水肿;胶质细胞增生,胶质结节形成;透明血栓生成等基本病变。（2）软化、空洞及钙化等继发性改变。HIE组与HBO治疗组统计学处理结果提示其损伤程度无明显差异（P＞0．05）。结论：本组资料显示高压氧治疗新生鼠缺氧缺血性脑病无明显效果,在方法学及疗效上值得商榷。     

Hyperbaric oxygenation therapy enhances the protective effect of moderate hypothermia against forebrain ischemia in the gerbil hippocampus.

Moderate hypothermia may have a beneficial effect on the neurological outcome. However, ischemic deterioration such as brain swelling during rewarming has been reported as a notable complication after successful therapeutic cerebral hypothermia. In this study, we investigated the effects of hyperbaric oxygenation during rewarming. Forebrain ischemia was produced in 24 gerbils and sham ischemia in 8 animals. Then ischemia-treated animals were divided into 3 groups, whole-body moderate hypothermia (31 degrees C for 60 min) and hyperbaric oxygenation (HBO2) (2- atmosphere absolute for 60 min using 100% oxygen) during rewarming group (n = 8), moderate hypothermia without HBO2 group (n = 8), and sham treatment without hypothermia and without HBO2 group (n = 8). Both the hypothermia group (77.9 +/- 48.1 neurons per mm, mean +/- SD) and hypothermia + HBO2 group (127.6 +/- 29.7 neurons per mm,) showed significant preservation of CA1 pyramidal neurons in the hippocampus compared to that in the sham treatment group (6.4 +/- 2.7) (p < 0.01). Furthermore, the hypothermia + HBO2 group showed significantly greater preservation of CA1 pyramidal neurons than the hypothermia group (p < 0.05). These results suggest that HBO2 during rewarming preserves the protective effect of hypothermia against ischemic neuronal damage.     

高压氧治疗对患者血压及心率变化的影响

目的 观察高压氧(HBO)治疗对人体血压、心率的影响,为临床更安全、有效地实施HBO治疗提供依据.方法 对行HBO治疗的57例患者(其中高血压病患者22例)分别于HBO治疗前、加压结束、稳压25 min、减压结束前、HBO治疗结束1 h测量血压及心率,并进行统计学分析.结果 高血压病患者及非高血压病患者血压、平均动脉压及心率的变化规律基本一致,收缩压在减压结束前与HBO治疗前比较明显升高(P<0.05);舒张压于稳压、减压阶段与HBO治疗前比较明显增高(P<0.05);平均动脉压于稳压、减压阶段与HBO治疗前比较明显升高(P<0.05);心率自加压结束前至减压结束前与HBO治疗前比较均明显减慢(P<0.01).结论 高血压病患者及非高血压病患者HBO治疗过程血压、平均动脉压及心率的变化规律基本一致.HBO治疗可以引起患者的血压升高、平均动脉压升高、心率减慢,且在减压阶段作用尤其明显,应引起足够的重视.