金黄色葡萄球菌脑炎病例讨论课件

单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,单击此处编辑母版标题样式,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,金黄色葡萄球菌脑炎病例讨论,金黄色葡萄球菌脑炎病例讨论,1,病例简介,李军 男,62,岁，因,“四肢乏力、肌肉痛,4,天”于,2012-1-17,日,17,：,52,入院,。,患者,入院,4,天前渐觉肢体无力，双下肢无力明显，尚能行走，无特殊诊治，,17,日自觉无力、肌痛症状加重，不能站立，急诊入院。既往：近,2,月来发现右侧颈部肿块，有心脏病、高血压病、脑外伤史，入院,10,天前有受凉感冒，自服感冒药。,入院时查体：体温,37.9,0C,，血压,150/100mmHg,，血糖,7.5,mmol/l,，神清、语言可，双侧瞳孔等大、等圆，对光反应灵敏，瞳孔直径,3,毫米，眼球运动正常，伸舌居中，颈抗阴性，双上肢肌力,4,级，双下肢肌力,3,级，病理征阴性，四肢肌肉压痛明显，心尖区吹风样杂音。有胸闷，吸氧，血氧饱和度正常。,右侧颈部可扪及到一肿块，大约,3X4cm,大小，质地中等,病例简介 李军 男 62岁，因“四肢乏力、肌肉,2,金黄色葡萄球菌脑炎病例讨论课件,3,金黄色葡萄球菌脑炎病例讨论课件,4,金黄色葡萄球菌脑炎病例讨论课件,5,金黄色葡萄球菌脑炎病例讨论课件,6,金黄色葡萄球菌脑炎病例讨论课件,7,金黄色葡萄球菌脑炎病例讨论课件,8,头部,CT,MRI,演变,头部CT,MRI演变,9,头部,CT,MRI,演变,头部CT,MRI演变,10,头部,CT,MRI,演变,头部CT,MRI演变,11,头部,CT,MRI,演变,头部CT,MRI演变,12,头部,CT,MRI,演变,头部CT,MRI演变,13,头部,CT,MRI,演变,头部CT,MRI演变,14,头部,CT,MRI,演变,头部CT,MRI演变,15,头部,CT,MRI,演变,头部CT,MRI演变,16,金黄色葡萄球菌脑炎病例讨论课件,17,甲状腺,CT,甲状腺CT,18,强化的,MRI,强化的MRI,19,强化的,MRI,强化的MRI,20,金黄色葡萄球菌脑炎病例讨论课件,21,神经影像学点评,该病例神经影像学演变有以下几个特点：,1,由于病情发展快，神经影像学变化大，做到实时跟踪。,2,发病第五天第一次头部,MRI,平扫，除左侧颞叶因脑外伤所致脑软化灶外，可见右侧额叶散在的大小不一类似脑梗死灶。如图所示。未见出血等其他病灶。,神经影像学点评该病例神经影像学演变有以下几个特点：,22,3,发病第七天头部,MRI,平扫，,DWI,CT,显示病灶播散、广泛，小脑、双侧大脑半球白质、灰质均有病灶，出血与类似梗死灶同时存在。但是，中线结构没有移位，脑室系统内未见出血。脑干未见明显病灶，与临床表现不符（眼球固定、双眼睑下垂、声音嘶哑）。此时，已有胸、腹部、大腿,内侧散在暗红色疱疹。,在,ICU,抢救后，病情,一度有好转。,3 发病第七天头部MRI平扫，DWI,CT显示病灶播散、广泛,23,4,发病后第十天，头部,CT,示脑出血，脑室内出血。但是，中线结构仍然没有移位。病情进行性加重，出现昏迷。,4 发病后第十天，头部CT示脑出血，脑室内出血。但是，中线结,24,5,发病第十三天，头部,CT,没有很大变化（与,23,号比较），病情有所好转，皮疹消退，输血小板后，血小板有所恢复。但是，神经系统状况无好转。,5 发病第十三天，头部CT没有很大变化（与23号比较），病情,25,结合文献讨论,结合文,26,金黄色葡萄球菌简介,金黄色葡萄球菌,(Staphyloccocus aureus Rosenbach),是人类的一种重要,病原菌,，隶属于葡萄球菌属（,Staphylococcus,），有“嗜肉菌,”,的别称，是革兰氏阳性菌的代表，可引起许多严重感染。,金黄色葡萄球菌细胞壁含,90%,的,肽聚糖,和,10%,的,磷壁酸,。其肽聚糖的网状结构比革兰氏阴性菌致密，染色时结晶紫附着后不被酒精脱色故而呈现紫色，相反，阴性菌没有细胞壁结构，所以紫色被酒精冲掉然后附着了沙黄的红色 。新出现的耐甲氧西林,金黄色葡萄球菌,，被称作,超级细菌,，几乎能抵抗人类现在所有的药物，但是万古霉素可以对付它。 典型的金黄色葡萄球菌为球型，直径,0.8m,左右，,显微镜,下排列成葡萄串状。,金黄色葡萄球菌无芽胞、,鞭毛,，大多数无荚膜，,革兰氏染色,阳性。金黄色葡萄球菌营养要求不高，在普通,培养基,上生长良好，需氧或兼性厌氧，最适生长温度,37C,，最适生长,pH,7.4,干燥环境下可存活数周。平板上,菌落,厚、有光泽、圆形凸起，直径,12mm,。血平板菌落周围形成透明的溶血环。金黄色葡萄球菌有高度的耐盐性，可在,1015%NaCl,肉汤中生长。可分解,葡萄糖,、,麦芽糖,、,乳糖,、,蔗糖,，产酸不产气。,甲基红,反应阳性，,VP,反应弱阳性。许多菌株可分解,精氨酸,，水解,尿素,，还原,硝酸盐,，液化,明胶,。金黄色葡萄球菌具有较强的抵抗力，对,磺胺,类药物敏感性低，但对青霉素、,红霉素,等高度敏感。对碱性染料敏感，十万分之一的龙胆紫液即可抑制其生长。,金黄色葡萄球菌简介 金黄色葡萄球菌 (Staphyloc,27,金黄色葡萄球菌脑炎病例讨论课件,28,流行病学,金黄色葡萄球菌在自然界中无处不在，空气、水、灰尘及人和动物的排泄物中都可找到。因而，食品受其污染的机会很多。,美国疾病控制中心,报告，由金黄色葡萄球菌引起的感染占第二位，仅次于,大肠杆菌,。金黄色葡萄球菌,肠毒素,是个世界性卫生难题，在,美国,由金黄色葡萄球菌肠毒素引起的,食物中毒,，占整个,细菌性食物中毒,的,33%,，加拿大则更多，占到,45%,，我国每年发生的此类中毒事件也非常多。,金黄色葡萄球菌的流行病学一般有如下特点：季节分布，多见于春夏季；中毒食品种类多，如奶、肉、蛋、鱼及其制品。此外，剩饭、油煎蛋、糯米糕及凉粉等引起的中毒事件也有报道。,上呼吸道感染,患者,鼻腔,带菌率,83%,，所以人畜,化脓性感染,部位，常成为污染源。,一般说，金黄色葡萄球菌可通过以下途径污染食品：食品加工人员、炊事员或销售人员带菌，造成,食品污染,；食品在加工前本身带菌，或在加工过程中受到了污染，产生了肠毒素，引起食物中毒；熟食制品包装不密封，运输过程中受到污染；奶牛患化脓性,乳腺炎,或禽畜局部化脓时，对肉体其他部位的污染。 金黄色葡萄球菌是人类化脓感染中最常见的,病原菌,，可引起局部化脓感染，也可引起,肺炎,、,伪膜性肠炎,、,心包炎,等，甚至,败血症,、,脓毒症,等,全身感染,。,金葡菌还是医源性感染原因之一,金黄色葡萄球菌的致病力强弱主要取决于其产生的,毒素,和,侵袭性酶,：,流行病学 金黄色葡萄球菌在自然界中无处不在，空气、水,29,a.,溶血毒素,：,外毒素,，分,、,、,、,四种，能损伤,血小板,，破坏,溶酶体,，引起肌体局部缺血和坏死,b.,杀死,白细胞,素：可破坏人的白细胞和,巨噬细胞,c.,血浆凝固酶：当金黄色葡萄球菌侵入人体时，该酶使,血液,或,血浆,中的,纤维蛋白,沉积于菌体表面或凝固，阻碍,吞噬细胞,的吞噬作用。葡萄球菌形成的感染易局部化与此酶有关,d.,脱氧核糖核酸酶：金黄色葡萄球菌产生的脱氧核糖核酸酶能耐受高温，可用来作为依据鉴定金黄色葡萄球菌,e.,肠毒素：金黄色葡萄球菌能产生数种引起,急性胃肠炎,的蛋白质性肠毒素，分为,A,、,B,、,C1,、,C2,、,C3,、,D,、,E,及,F,八种,血清型,。肠毒素可耐受,100C,煮沸,30,分钟而不被破坏。它引起的食物中毒症状是呕吐和腹泻。此外，金黄色葡萄球菌还产生溶表皮素、明胶酶、,蛋白酶,、,脂肪酶,、,肽酶,等。,a.溶血毒素：外毒素，分、四种，能,30,金葡菌引发各种疾病,1,肠炎,：,多因原发疾病长期用,抗生素,引起,肠道菌群失调,所致（如感冒），抗生素敏感菌株受到抑制，耐药的金黄色葡萄球菌株趁机繁殖。金黄色葡萄球菌为侵袭性细菌，能产生毒素，对肠道破坏性大，所以金黄色葡萄球菌肠炎起病急，中毒症状严重，主要表现为呕吐、发热、腹泻。呕吐常在发热前出现，发热很高。轻症大便次数稍多，为黄绿色糊状便；重症大便次数频数，每日可达数十次，大便呈暗绿色水样便，外观像,海水,，所以叫海水样便。粘液多，有腥臭味，有时可排出片状伪膜，将伪膜放入生理水，脱落的肠粘膜即漂在水面上，对诊断帮助很大。,体液,损失多，患儿脱水、,电解质,紊乱和酸中毒严重，可发生休克。挑选大便粘液部分涂片，在显微镜下检查可见大量脓细胞，如经革兰氏染色，显微镜检查可见成堆的大量革兰氏阳性球菌。大便培养金黄色葡萄球菌生长，即可明确诊断。,金葡菌引发各种疾病1 肠炎：,31,2,亚急性细菌性心内膜炎,：,病因 ：,1,，病原体侵入血流：引起菌血症败血症或脓毒血症并侵袭心内膜；,2,，心瓣膜异常：有利于病原微生物的寄居繁殖；,3,，防御机制的抑制：例如肿瘤患者使用细胞毒性药物和器官移植患者用免疫抑制剂时病因包括各种细菌真菌及贝纳特,考克斯,体（,coxiella burnettii,）等 。,2 亚急性细菌性心内膜炎：,32,临床症状,亚急性感染性心内膜炎：较急性者为常见且重要,（,1,）一般表现：大多数病例起病缓慢，低热、乏力疲倦、少数起病急，有寒战、高热，或栓塞现象；部分患者起病前有口腔手术史，呼吸道感染、流产或分娩的病史 。,（,2,）发热：伴全身性感染时，发热最常见，常呈原因不明的持续发热一周以上，不规则低热多在,38.5,40,之间，也可为间歇热或弛张热伴有乏力盗汗，进行性贫血，脾肿大，晚期可有杵状指,（,3,）精神障碍：患者可伴有轻微的精神症状，但极少出现严重的精神错乱或谵妄，若心内膜炎并发蛛网膜下腔出血或脑膜炎，则常会出现激越行为，精神错乱和意识障碍，亦可伴有局灶性的神经系统体征,未治疗的急性患者几乎均在,4,周内死亡，亚急性者的自然史一般,6,个月。预后不良因素中以心力衰竭最为严重。除耐药的格兰阴性杆菌和真菌所致的心内膜炎者外，大多数患者可获细菌学治愈。但本病的近期和远期病死率仍较高。,临床症状,33,体证：,原有,心脏,病杂音，相当一部分的病例在病程中杂音的性质及强度发生改变。部分病例有欧氏小结，也可有詹恩威结。后期可见脑、脾、肾等器官,栓塞,相应体征。,体证：,34,Toxic Shock Syndrome,（,TSS),Author: Ramesh Venkataraman, MBBS; Chief Editor: Michael R Pinsky, MD, CM, FCCP, FCCM,定义：,Toxic shock syndrome (TSS) is a toxin-mediated acute life-threatening illness, usually precipitated by infection with either,Staphylococcus aureus,or group A,Streptococcus,(GAS), also called,Streptococcus pyogenes,Toxic Shock Syndrome（TSS),35,金黄色葡萄球菌脑炎病例讨论课件,36,临床表现：,It is characterized by high fever, rash, hypotension, multiorgan failure (involving at least 3 or more organ systems), and desquamation, typically of the palms and soles, 1-2 weeks after the onset of acute illness. The clinical syndrome can also include severe myalgia, vomiting, diarrhea, headache, and nonfocal neurologic abnormalities.,临床表现：,37,金黄色葡萄球菌脑膜炎,一、病因,主要是亚细，其次颅脑损伤、颅脑手术后及腰椎穿刺时消毒不严也可并发脑膜炎。脑膜附近的感染病灶如中耳炎、乳突炎、,鼻窦炎,等亦可引起该病。新生儿脐带和皮肤的金葡菌感染也可继发脑膜炎，发病时间多在产后,2,周左右。其他易患因素为：糖尿病、静脉滥用毒品、,血液,透析及恶性,肿瘤,等。,二、发病机制,细菌侵入脑膜可有多种途径：,血源性：经血循环进入脑膜；,直接扩散：可以是颅脑外伤从颅外如耳部或鼻部感染向颅内扩散；,逆行性血栓性脉管炎；,医源性通路：颅脑手术的污染、脑室引流及造影而将化脓菌直接接种于蛛网膜下腔。细菌抵达脑膜引起化脑，其致病机制和病理改变与脑膜炎球菌脑膜炎相似,金黄色葡萄球菌脑膜炎 一、病因,38,三、临床表现,起病不太急，常于原发,化脓性感染,数天或数周后发病，多有全身感染,中毒,症状,。畏寒,发热,，伴持久而剧烈的,头痛,，颈强直较一般脑膜炎明显。除有脑膜炎症状外，尚有局部感染病灶，败血症患者还可有其他迁徙,性病,灶。还可出现皮疹，如,荨麻疹,样、猩红热样皮疹或小,脓疱,疹。皮肤可见出血点，但很少融合成片，与脑膜炎球菌脑膜炎不同。如败血症过程中出现头痛、,呕吐,、神志改变、,脑膜刺激征,等表现，应及时地进行脑脊液,检查,。病变以蛛网膜下腔为主，额叶、颞叶、顶叶部位较明显，病程中可出现硬膜下积液、积脓，颅底粘连，可致脑神经损害。并发脑脓肿者，可发生肢体,瘫痪,。,三、临床表现,39,Thyroiditis,Author: Robert P Hoffman, MD; Chief Editor: Stephen Kemp, MD, PhD, Medscape,The broad category of thyroiditis includes the following inflammatory diseases of the thyroid gland: (1) acute suppurative thyroiditis, which is due to bacterial infection; (2) subacute thyroiditis, which results from a viral infection of the gland; and (3) chronic thyroiditis, which is usually autoimmune in nature,Thyroiditis,40,Acute suppurative thyroiditis is rare in childhood because the thyroid is remarkably resistant to hematogenously spread infection. Most cases of acute thyroiditis involve the left lobe of the thyroid and are associated with a developmental abnormality of thyroid migration and the persistence of a pyriform sinus from the pharynx to the thyroid capsule. The usual organisms responsible include,Staphylococcus aureus,Streptococcus hemolyticus, and pneumococcus. Other aerobic or anaerobic bacteria may also be involved.,Acute suppurative thyroid,41,History,A history of acute illness, including fever, chills, neck pain, sore throat, hoarseness, and dysphagia, is common.,Neck pain is frequently unilateral and radiates to the mandible, ears, or occiput. Neck flexion reduces the severity of the pain. The pain worsens with neck hyperextension.,Physical,Acute thyroiditis,The patient may have a fever of 38-40C.,Acute illness may be evident.,Neck tenderness is present, and the swollen thyroid gland is tender. The swelling and tenderness may be unilateral. Erythemas develop over the gland, and regional lymphadenopathy may develop as the disease progresses. Abscess formation may occur,History,42,Laboratory Studies,Acute thyroiditis,Laboratory abnormalities in acute thyroiditis reflect the acute systemic illness.,Findings include leukocytosis with a left shift and an increased sedimentation rate.,Thyroid function test results are within the reference range,Laboratory Studies,43,Subacute thyroiditis,is generally thought to be due to viral processes and usually follows a prodromal viral illness. Various viral illnesses may precede the disease, including,mumps,measles,influenza,infectious mononucleosis, adenoviral or Coxsackievirus infections, myocarditis, or the common cold. Other illnesses or situations associated with subacute thyroiditis include,catscratch fever,sarcoidosis,Q fever,malaria, emotional crisis, or dental work. The disease is more common in individuals with human leukocyte antigen (HLA)Bw35.,Subacute thyroiditis is ge,44,History,Subacute thyroiditis,Neck tenderness and swelling may occur.,Occasionally, the initial symptoms are those of hyperthyroidism.,Systemic symptoms such as weakness, fatigue, malaise, and fever are usually low grade.,Physical,Subacute thyroiditis,The patient may have signs of systemic illness, such as low-grade fever and weakness.,Signs of hyperthyroidism, including increased pulse rate, widened pulse pressure, fidgeting, tremor, nervousness, tongue fasciculations, brisk reflexes (possibly with clonus), weight loss, and warm moist skin, may be present.,The thyroid gland may be enlarged and tender, with tenderness exacerbated by neck extension.,History,45,Laboratory Studies,Subacute thyroiditis,The primary laboratory abnormalities are consistent with abnormal thyroid function. Initially, the thyroid-stimulating hormone (TSH) level is suppressed, and the free thyroxine (T4) level is increased. As the disorder progresses, transient or sometimes permanent hypothyroidism may develop.,The WBC count is usually within the reference range but may be mildly elevated. High-sensitivity C-reactive protein levels are usually elevated in subacute thyroiditis.,Laboratory Studies,46,Because,chronic thyroiditis,in children is usually due to an autoimmune process, it is HLA-associated, similar to other autoimmune endocrine diseases. The specific alleles in the atrophic and goitrous forms of the disease vary. The histologic disease picture varies, but lymphocytic thyroid infiltration is the hallmark of the disease and frequently obliterates much of the normal thyroid tissue. Follicular thyroid cells may be small or hyperplastic. The degree of fibrosis among patients also widely varies. Children usually have hyperplasia with minimal fibrosis. The blood contains autoantibodies to thyroid peroxidase and, frequently, autoantibodies to thyroglobulin. Autoimmune thyroiditis is also frequently part of the polyglandular autoimmune syndromes.,Because chronic thyroid,47,History,Chronic autoimmune thyroiditis is observed in the following 3 patterns:,Goiter that is usually diffuse and nontender: Systemic illness is not evident. The thyroid gland is frequently 2-3 times its normal size and may be larger. The patient, parent, or physician may discover the goiter.,Symptoms of hypothyroidism: In children, this frequently includes poor growth or short stature. Adolescent girls may have primary or secondary amenorrhea. Boys may have delayed puberty. Because the disease develops slowly, the patient or parent may not notice other signs of hypothyroidism, including constipation, lethargy, and cold intolerance. The child with diabetes may have decreasing insulin requirement.,Symptoms of hyperthyroidism: These may include poor attention span, hyperactivity, restlessness, heat intolerance, or loose stools.,History,48,Physical,Chronic autoimmune thyroiditis,Initially, an enlarged, lumpy, bumpy, and nontender thyroid is often present. The gland may not be enlarged, particularly in children who have profound hypothyroidism. Signs of hypothyroidism include slow growth rate, weight gain, slow pulse, cold dry skin, coarse hair and facial features, edema, and delayed relaxation of the deep tendon reflexes.,Signs of hyperthyroidism are occasionally present early in the disease,Physical,49,Laboratory Studies,Chronic thyroiditis,Laboratory abnormalities reflect thyroid function abnormality and evidence of autoimmunity.,TSH levels are increased in children with subclinical and overt hypothyroidism. Free T4 levels are within the reference range in the former and low in the latter. In children with hyperthyroidism, TSH levels are suppressed. Many children have normal thyroid function and normal TSH levels.,Antithyroid peroxidase (antithyrocellular, antimicrosomal) antibody levels elevated above the reference range are the most sensitive indicator of thyroid autoimmunity. Many children also have antithyroglobulin antibodies, although this is less sensitive and less specific.,Laboratory Studies,50,staphylococcus aureus,encephalitis,staphylococcus aureus encephal,51,金黄色葡萄球菌脑炎病例讨论课件,52,金黄色葡萄球菌脑炎病例讨论课件,53,金黄色葡萄球菌脑炎病例讨论课件,54,金黄色葡萄球菌脑炎病例讨论课件,55,After acute development of a left sided palsy a 57-year-old Caucasian German woman was referred to us with a preceding 4-day history of high-grade fever, coughing and,general weakness. Due to mechanical replacement of the,aortic valve 11 months ago, ampicillin and sulbactam had,been selected for antibiotic treatment. Initial chest X-ray,transthoracic echocardiography, abdominal ultrasound,and cultures of blood and urine had all been negative for,signs of infection.,After acute developme,56,The neurological exam revealed left facial weakness, slurriness of speech, left-sided hemi-paresis and hemihypaesthesia whereas clinical examina-tion was normal apart from minor respiratory distress.,Blood tests showed a normal white cell count, a low,platelet count (60 109/l), elevations of creatine kinase,(466 U/l), serum troponin T (0.04 g/l), and an elevated,CRP (471 mg/l) while coagulation tests demonstrated an,INR of 2.4 (under coumarine treatment) that was normal-,ized rapidly thereafter.,The neurological exam re,57,The initial brain CT and MRI revealed two secondarily haemorrhaged infarcted areas (Figure 1). The analysis of the cerebrospinal fluid displayed a cell count of 127/ l, a total protein of 1.36 g/l and lactate concentration of 3.5 mmol/l. Because of the severe septic clinical course antibiotic therapy was changed to ceftriax-one, gentamicin and linezolid. Complementary transoeso-phageal echocardiography showed two major vegetations on the mechanical aortic valve and the development of an aortic ring abscess (Figure 1, I+J). These findings pointed,conclusively to a septic embolic encephalitis due to IE.,The initial brain CT and,58,A severe deterioration of the patient s clinical condition,caused by additional intracranial bleedings four days later,(Figure 1, C+D) prevented a surgical replacement of the,aortic valve. All blood cultures revealed a Staphylococcus,aureus bacteriaemia resistant to the formerly applied,ampicillin but sensitive to gentamicine and linezolid.,Although medical therapy was intensified, the patient,finally died from cardiac failure.,A severe deterioration of the,59,Figure 1. Axial cNECT and cMR images on admission (A+B, E-H) and 4 days after onset of neurological symptoms (C+D). (A+B) NECT images show initially small cortical bleedings left frontal and right occipital and swollen cortex sections right occipital. (C+D) 4 days later the haemorrhage is enlarged, and multiple zones of infarction are visible. (E+F) Axial FLAIR,weighted images demonstrate bilaterally multiple cortical and subcortical signal hyperintensities representing multiple ischemic lesions. (G+H) Axial T2*GRE MR images show microbleedings and haemorrhages within infarcted lesions. Transoesophageal,echocardiogram examination shortly after admission (I+J). (I) Demonstration of two large oscillating vegetations (arrows), one of 4.5 2 mm on the upstream side and one of 4.3 7.4 mm on the downstream side of the bileaflet tilting disk valve. (J) Closer examination of the mechanical aortic valve shows relevant thickening of the aortic root indicating an evolving ring abscess,(arrow).,Figure 1. Axial cNECT and cMR,60,AJNR Am J Neuroradiol 27:217990 Nov-Dec 2006 www.ajnr.org 2179,AJNR Am J Neuroradiol 27:2179,61,金黄色葡萄球菌脑炎病例讨论课件,62,小 结,一、该病例特点,1,基础疾病：,1,）自身免疫性疾病：甲状腺肿块（性质待定），,TSH,受体抗体,（,+,），,GAD(-),。,丙肝抗体,（,+,）,2,）脑外伤、高血压。,2,诱因：,感冒，自服感冒药后发病。,3,发病后早期症状：,1,）一般症状：发热、肌肉疼痛、四肢乏力。,2,）神经系统症状：双下肢无力，但是能站立，,体征：神清，颅神经阴性，双上肢肌力,4,级，双下肢肌力,3,级，肌肉压痛。未见皮肤出血点。心脏可闻吹风样杂音。,63,4,病情进展,病情进行性加重，从一般症状如发热、肢体乏力、肌肉疼痛到出现,CNS,体征没有过渡阶段。不像金葡菌脑膜炎或其他细菌性脑膜炎，有一个最后形成脑脓肿短暂的过渡阶段（几天或几周）。,其原因：,A,亚细：赘生物脱落 细菌栓子 脑炎,B,微小脑脓肿早就寄生在脑实质中，一旦引起抵抗力下降诱因出现如感冒，引起细胞因子和趋化因子释放，导致炎性脱髓鞘和脑微小血管出血，梗死，出现中毒性脑炎。当有效的抗生素使用，杀死大量金葡菌，又会导致金葡菌释放大量外毒素，进一步使细胞因子和趋化因子释放，形成恶性循环，血小板进一步下降，导致大量脑出血。因此，临床表现进一步加重。,4 病情进展,64,5,实验室特点：,A,血小板进行性下降；输入血小板后有短暂升高，随后又下降；,B,早期白细胞总数正常，但是中性粒细胞数高，随着病情发展，白细胞总数和中性粒细胞数进一步增高。,C,降钙素原和高敏性,C,反应蛋白增高，以上几点说明重症感染到来。即使体温不是很高。尤其要注意老年人、长期慢性疾病的病人，机体反应能力差，甚至体温不高，白细胞总数一直不高。,D,脑脊液：早期细胞数不高或稍高，但是，脑压高，蛋白高，有少量红细胞（几个），一定要排除损伤所致。糖和氯化物不低。当然，要看脑炎病情。随着病情发展，脑压进一步增高，白细胞数和红细胞进一步增多。但是，脑脊液中不一定能培养出金葡菌。,E,肾功能和肝功能恶化，肌酶谱增高。,F,今后凡是发热、血小板下降，合并有慢性疾病，尽早做血培养，降钙素元，,C,反应蛋白，血常规等。,5 实验室特点：,65,G,说明有重症感染的指标：,1,甲状腺功能的结果。,2,血常规：白细胞总数和中性粒细胞数增高；血小板进行性下降。,3,高敏性,C-,反应蛋白和降钙素元增高,4,凝血功能、肝肾功能恶化,5,临床表现进行性加重,6,特别注意：老年人、患有慢性疾病、免疫功能低下的病人，对以上指标可能不敏感，体温都不会升高。但是，恰恰说明病情严重！遇到此种情况，必须与家属反复沟通。并要反复签字。,G 说明有重症感染的指标：,66,6,头部,MRI,和,CT,A MRI,：早期,T1,出现低信号，,T2,和,flair,出现高信号，部位出现在白质或灰白质交界处，要考虑炎性脱髓鞘。此时，要做,GRE,，排除脑微小血管出血。尤其是在炎性脱髓鞘病灶内出血灶。,该病例,DWI,示有,PRES,。国外注意到,DWI,能区别硬膜下小脓肿。,往往炎性脱髓鞘灶和出血灶同时存在，而且，病灶分散，不符合脑动脉支配区的出血和梗死。这是金葡菌脑炎影像学特点，国内外文献均证明。但是，要特别注意合并脑静脉（窦）血栓形成。,B CT,监测脑出血情况。,6 头部MRI和CT,67,小 结,二、金葡菌脑炎病原菌来源,：,1,）亚急性细菌性心内膜炎：可以是金葡菌，也可以是其他细菌。引起亚细的原因大多数是医源性，如介入，心脏瓣膜置换术等。,2,）脑微小脓肿形成：长期慢性疾病，尤其是引起自身免疫力下降疾病如类风关、红斑狼疮综合症、慢性甲状腺炎（如桥本氏甲状腺炎）、慢性肾病等自身免疫性疾病，以及糖尿病、癌症、,HIV,；付鼻窦炎，中耳炎；脑外伤、慢阻肺、龋齿等。加上病人有发热、血小板减少，白细胞总数高等感染症候，要怀疑脑微小脓肿。,3,）滥用抗生素，导致菌丛失调。,4,）不良饮食习惯，引起金葡菌肠炎；不良生活习惯如抠鼻屎（,83%,金葡菌寄生在此），剔牙。,68,三、 治疗,A,针对药敏，选择抗生素,B,输血小板，以及其他支持疗法如白蛋白等,C,脱水，降颅压，保护肝肾功能,D,对症治疗,三、 治疗,69,四、要注意几个问题,1,病毒性脑炎合并金葡菌脑炎,2,自身免疫性脑炎合并金葡菌脑炎,3,自身免疫性疾病基础上合并病毒性脑炎和金葡菌脑炎。这些情况国外都有报道。,4,由于神经内科病人基础疾病复杂，确实不能排除有的病人患有脑微小脓肿，而不被人知。因此，今后凡是发热、血小板减少，,C-,反应蛋白高的病人，都要做血培养，做头部,GRE,发现微小血管出血，尤其是在炎性脱髓鞘病灶内有微小血管出血。更应该怀疑。,四、要注意几个问题,70,金葡菌,脑小脓肿，长期寄生在脑实质，无临床症状,金葡菌 脑小脓肿，长期寄生在脑实质，无临床症状,71,金黄色葡萄球菌脑炎病例讨论课件,72,