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急性感染诊断与处理原则.ppt

  • 2026-04-14 11:26:13
急性感染诊断与处理原则.ppt

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先看看我写的学习笔记,PPT往下翻。
  • 基本临床特点

    • 概述:发热与感染紧密相连,是感染的基本特征之一。体温高于 38℃或相较于基础体温下降,都可能是严重感染的信号。急性感染的临床特征因病因、发生部位、季节、易患人群的差异而有所不同,可依据病原体进行分类。

    • 急性细菌性感染:细菌是急性感染最常见的致病微生物,急性细菌性感染在各类急性感染中占比超半数,常见于临床急诊。可由革兰氏阳性或阴性菌引发,也可能是多种细菌混合感染。其临床症状以发热最为常见,热型和发热程度与感染部位、范围及细菌毒力相关。典型体征方面,浅表感染表现为化脓性病灶,伴有红、肿、热、触痛;深部感染时,病变对应体表会出现局限或放射性压痛,并伴有器官功能障碍。实验室检查中,白细胞计数增高,中性粒细胞百分比增高或核左移,尿、便、脑脊液等常规检测白细胞计数增高也有诊断意义。痰、尿、血等标本细菌涂片或培养阳性是确诊的关键证据。感染生化标志物如 C 反应蛋白(CRP)、降钙素原(PCT)、白细胞介素 - 6(IL - 6)、血清淀粉样蛋白 A(SAA)在诊断和病情评估中具有重要价值。

    • 急性病毒性感染:四季均可发病,冬春季节发病率较高,与多种传染性疾病相关,部分病毒感染引发的肺炎传染性强、病死率高。临床特点为早期多以高热或超高热首发,常持续高热,伴有畏寒、头痛、乏力、肌肉关节酸痛等症状,之后出现其他症状。白细胞计数正常或偏低,淋巴细胞或单核细胞百分比升高。可采用核酸杂交、PCR 技术检测病毒核酸,利用免疫荧光标记、化学发光技术检测病毒抗原,核酸检测是早期诊断的可靠方法。感染生化标志物 PCT 不增高或轻度增高,血清学检查中特异性 IgM 抗体有助于早期诊断,急性期与恢复期双份血清抗体滴度增高 4 倍及以上可确诊。

    • 支原体感染:支原体是介于细菌和病毒之间的原核微生物,临床上最常见的疾病为支原体肺炎,与其他微生物所致肺炎鉴别存在难度。发热多在 38 - 39℃,很少超过 39℃。起病较缓,初期类似上呼吸道感染,以阵发性、刺激性干咳为主要特点,个别病人有少量黏痰或因剧烈咳嗽出现血痰。血常规检查中,外周白细胞计数、中性粒细胞百分比正常,细胞分类大多正常,个别病人淋巴细胞轻度升高。血清支原体抗体 IgM 是感染后最早出现的特异性抗体,发病 1 - 2 天可呈阳性,是目前诊断支原体感染的首选方法。胸部 X 线检查缺乏特异性,病灶多呈小叶性、多发性分布,也可呈单叶、肺段分布。

    • 真菌感染:按侵犯人体部位分为浅表、皮肤、皮下和系统性四种,多为浅表组织感染,诊断相对容易。全身性侵袭性真菌感染虽不多见,但在特定人群中有所增加,G 试验和 GM 试验有助于判断侵袭性真菌感染。

    • 其他微生物感染:寄生虫感染临床症状多轻微或无症状,严重时可致腹痛、贫血、营养不良等。衣原体感染常见于尿道炎、结膜炎、肺炎等,约半数感染者无症状,起病缓慢,潜伏期为 5 - 14 天。螺旋体感染以钩端螺旋体病为例,有发热、头痛、肌痛等症状,严重时可导致肺出血或黄疸。立克次体感染有发热、头痛、皮疹等症状,确诊依赖特殊的培养和血液检测。

  • 诊断与鉴别诊断

    • 诊断思维方法:临床常用按致病微生物分类,急诊多采用社区获得性感染和医院获得性感染的分类方式。医院获得性感染指原无感染的病人住院超过 48 小时后获得的感染,包括住院期间感染及出院小于 72 小时内由住院获得病原体引发的感染,还可细分为内源性感染和外源性感染。询问病史时应按系统顺序进行,有助于急诊诊断与鉴别,减少漏诊。不同部位感染的症状体征各异,浅表感染诊断较易,深部及器官感染在各系统有不同表现,全身性感染的脓毒症有典型的临床表现。

    • 诊断:同时具备突然发热或低体温、白细胞计数增高或降低、能确定感染病灶部位并伴有相关症状与体征,可确立临床诊断。当病人仅以某些临床症状首发时,需结合查体和辅助检查进一步明确诊断。明确病原学是急性感染诊断中最困难的环节,诊断时要警惕非细菌性感染和传染性疾病。

    • 鉴别诊断:诊断急性感染时,需与非感染性发热、白细胞计数异常疾病鉴别。如血液病与恶性肿瘤,虽有发热等症状,但无感染病灶,病原学和血清学检查阴性,抗生素治疗无效,可通过骨髓涂片检查鉴别。超敏反应性疾病,如药物热、血型不合的输血等,有用药或输血史,无感染证据。结缔组织病,如系统性红斑狼疮等,长期不规则发热,伴皮肤、关节、内脏损害,白细胞计数一般不高,抗生素治疗无效。还有甲状腺功能亢进、甲状腺危象、严重失水或出血等疾病,依据相关病史和临床特点进行鉴别。

  • 急诊处理

    • 一般处理:保证患者充足休息,及时补充液体。高热时可采用物理降温或药物退热,谨慎使用糖皮质激素类药物,无感染性休克时禁用。

    • 抗感染药物选择:急性细菌感染初期可经验性选择抗生素,必要时进行微生物培养和药敏试验,依结果调整用药。局部脓肿类感染优先开放引流,必要时联合全身性抗生素治疗。严重全身性细菌性感染需尽快收入住院。抗病毒感染药物针对性强,病毒感染多以缓解症状、对症处理为主,如需使用抗病毒药物,建议在感染后 24 - 48 小时内开始用药。局限性浅表性真菌感染采用局部用药治疗,侵袭性深部真菌感染根据情况口服或静脉使用抗真菌药物,并密切监测肝、肾功能。

    • 外科治疗:当浅表性局限性脓肿或深部组织、器官感染常规抗感染治疗效果不佳或无效时,可考虑外科引流或手术干预。

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                                                                            1. CONNECT:[ UseTime:0.000593s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
                                                                            2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000711s ]
                                                                            3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000315s ]
                                                                            4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000342s ]
                                                                            5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000651s ]
                                                                            6. SELECT * FROM `set` [ RunTime:0.000273s ]
                                                                            7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000640s ]
                                                                            8. SELECT * FROM `article` WHERE `id` = 459726 LIMIT 1 [ RunTime:0.000949s ]
                                                                            9. UPDATE `article` SET `lasttime` = 1776881232 WHERE `id` = 459726 [ RunTime:0.001641s ]
                                                                            10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000248s ]
                                                                            11. SELECT * FROM `article` WHERE `id` < 459726 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000436s ]
                                                                            12. SELECT * FROM `article` WHERE `id` > 459726 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000361s ]
                                                                            13. SELECT * FROM `article` WHERE `id` < 459726 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000683s ]
                                                                            14. SELECT * FROM `article` WHERE `id` < 459726 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001772s ]
                                                                            15. SELECT * FROM `article` WHERE `id` < 459726 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000990s ]
                                                                            0.080482s