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【359】心律失常.ppt

  • 2026-04-03 23:05:59
【359】心律失常.ppt

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先看看我写的学习笔记,PPT往下翻。

心律失常是心肌细胞电生理异常引发的心脏节律 / 频率异常,ICU 中多由器质性心脏病、电解质紊乱等诱发,核心按 “对血流动力学影响” 分类救治,致命性类型需紧急电复律或药物干预,同时重视病因治疗。


一、病因

(一)器质性心脏病(ICU 最常见)

  • 核心机制:心肌缺血、缺氧、炎症等导致电生理异常,应激状态下儿茶酚胺过度释放诱发恶性心律失常。
  • 高发疾病:缺血性心脏病、心力衰竭、心源性休克等,易引发严重血流动力学障碍。

(二)非心源性疾病与理化因素

  • 非心源性疾病:急性坏死性胰腺炎、脑血管意外、慢阻肺等,通过心肌抑制因子释放、免疫复合物沉积等损伤心肌。
  • 理化与中毒:严重中暑、电击伤,有机溶剂、有机磷农药等中毒,直接影响心肌电活动。

(三)电解质与酸碱平衡紊乱

  • 核心诱因:低钾、高钾、低镁、低钙血症及酸碱失衡,导致心肌自律性、兴奋性、传导性异常。

(四)医源性因素

  • 药物相关:肾上腺素、强心药、部分抗肿瘤药,及抗心律失常药物本身的致心律失常作用。
  • 操作相关:介入操作、有创监测、体外循环、心脏手术、溶栓治疗等。

(五)生理性因素

  • ICU 环境引发自主神经功能紊乱,诱发室上性心律失常或期前收缩,虽多不影响血流动力学,但需结合重症病情重视。

二、常见类型与诊断

(一)分类原则(按血流动力学影响)

  1. 明显影响(致命性):阵发性 / 持续性室性心动过速、尖端扭转型室速、心室扑动 / 颤动、二度 Ⅱ 型 / 三度房室传导阻滞。
  2. 潜在影响:窦性心动过速、房性心动过速、阵发性室上速、房颤 / 房扑、多源性 / 成对室性期前收缩、R on T 型室早。
  3. 无明显影响:窦性心动过缓、一度 / 二度 Ⅰ 型房室传导阻滞、单源性房性 / 室性期前收缩。

(二)诊断方法

  1. 病史与问诊:意识清醒者有心悸、气短、胸痛等症状,重症患者需依赖床旁监测;追问心脏病史、致心律失常药物使用史、诱因(劳累、感染、中毒等)。
  2. 心电图检查(核心依据):
    • 关键鉴别点:P 波有无及位置(无 P 波提示房颤 / 房扑)、RR 间隔规律性(绝对不规则提示房颤)、QRS 波宽度(宽 QRS 波多为室性心律失常)。
    • 特征表现:室速伴房室分离,房颤见细小 f 波,三度房室传导阻滞 P 波与 QRS 波无关联。
  3. 其他检查:超声心动图(明确病因)、血气 / 电解质 / 血糖检测(排查诱因)。

三、治疗原则与方案

(一)总体原则

  • 血流动力学不稳定:紧急对症处理(电复律、起搏、药物),同时查找病因。
  • 血流动力学稳定:以病因治疗为核心,防范向恶性心律失常进展。

(二)明显影响血流动力学的心律失常(紧急处理)

  1. 心室颤动 / 无脉性室速:
    • 优先电除颤(单相波 360J,双相波 200J),除颤后立即行 5 个循环 CPR。
    • 药物:肾上腺素 1mg 静脉推注,无效时加用胺碘酮(初始 300mg 静脉推注)或利多卡因(1.5mg/kg 冲击)。
  2. 尖端扭转型室速:
    • Q-T 延长型:停用致 Q-T 延长药物,静脉推注硫酸镁 2~5g,先天性者加用 β 受体拮抗剂。
    • Q-T 正常型:联律间期短者首选维拉帕米,联律间期正常者用 Ⅰ/Ⅱ 类抗心律失常药。
  3. 严重缓慢性心律失常(心脏停搏、三度房室传导阻滞):
    • 高质量 CPR,紧急经皮临时起搏。
    • 药物:肾上腺素 1mg 静脉推注(每 3~5min 重复),不推荐常规用阿托品。

(三)潜在影响血流动力学的心律失常(针对性治疗)

  1. 阵发性室上速:
    • 药物:腺苷 3~6mg 快速静脉推注(有效率 90%),或维拉帕米、胺碘酮静脉推注。
  2. 心房颤动:
    • 控制心室率:艾司洛尔、美托洛尔等 β 受体拮抗剂,或毛花苷 C 静脉推注。
    • 转复窦性心律:口服胺碘酮、普罗帕酮,静脉推注胺碘酮 150mg。

核心总结

心律失常的救治关键是 “快速评估血流动力学状态 + 紧急干预 + 病因根治”。致命性类型需第一时间电复律或起搏,药物以胺碘酮、利多卡因、肾上腺素为核心;非致命性类型重点控制诱因,避免病情恶化。ICU 中需加强床旁心电监测,及时识别心律失常信号,结合病因综合治疗。

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  1. CONNECT:[ UseTime:0.001095s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001628s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000762s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000692s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001620s ]
  6. SELECT * FROM `set` [ RunTime:0.000614s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001381s ]
  8. SELECT * FROM `article` WHERE `id` = 492470 LIMIT 1 [ RunTime:0.001156s ]
  9. UPDATE `article` SET `lasttime` = 1775878842 WHERE `id` = 492470 [ RunTime:0.011300s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000706s ]
  11. SELECT * FROM `article` WHERE `id` < 492470 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001241s ]
  12. SELECT * FROM `article` WHERE `id` > 492470 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001083s ]
  13. SELECT * FROM `article` WHERE `id` < 492470 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004106s ]
  14. SELECT * FROM `article` WHERE `id` < 492470 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002062s ]
  15. SELECT * FROM `article` WHERE `id` < 492470 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002023s ]
0.210134s