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心脏传导阻滞丨ppt

  • 2026-04-16 13:51:02
心脏传导阻滞丨ppt

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  1. 概述:心脏传导阻滞是心脏传导系统因解剖或功能失常,致使冲动传导出现永久性或暂时性障碍,可发生在传导系统的任意位置,主要分为窦房传导阻滞、房室传导阻滞和室内传导阻滞。

  2. 房室传导阻滞

    • 定义与分类:指心房冲动向心室传导延迟或受阻,发生于房室交界区、希氏束及束支等部位。按严重程度分为三度,一度传导时间延长但冲动均能下传;二度分 Ⅰ 型(文氏阻滞,传导时间渐长直至冲动不能下传)和 Ⅱ 型(间歇出现传导阻滞),连续两个及以上冲动不能下传为高度房室传导阻滞;三度所有冲动不能传至心室,心房和心室节律各自独立。

    • 病因:生理性因素如部分健康人迷走神经张力高会出现一度或二度 Ⅰ 型房室传导阻滞,多为一过性。病理性因素众多,涵盖急性心肌梗死、心肌病等多种心脏疾病,电解质紊乱、药物中毒、心脏手术损伤以及老年传导系统退行性变等。

    • 临床表现:一度和二度 Ⅰ 型常无症状。二度 Ⅱ 型有心搏脱漏、心悸感;高度房室传导阻滞表现为头晕、黑矇、乏力;三度症状取决于心室率和伴随病变,严重时可引发晕厥、抽搐甚至猝死。听诊时不同程度的房室传导阻滞有不同特点,如一度 PR 间期延长、第一心音减弱,三度第一心音强度变化等。

    • 心电图特点:一度 PR 间期超 0.20 秒,QRS 波群正常;二度 Ⅰ 型 P 波规律,PR 间期渐长后脱漏 QRS 波群,常见房室传导比例为 3∶2 和 5∶4,多位于房室结,QRS 波群正常;二度 Ⅱ 型 PR 间期恒定,部分 P 波后无 QRS 波群,QRS 波群正常时阻滞可能在房室结,异常时在希氏束 - 浦肯野纤维系统,高度房室传导阻滞通常房室呈 2∶1 或 3∶1 传导;三度 P 波与 QRS 波群各自成节律,心房率快于心室率,心室起搏点位置不同,心室率和 QRS 波群表现有差异。

    • 治疗:针对病因治疗是首要原则。一度和二度 Ⅰ 型一般无需特殊治疗,症状明显且心室率缓慢者可考虑起搏治疗;不可逆的二度 Ⅱ 型、高度及三度房室传导阻滞,无论有无症状都应进行永久起搏治疗。阿托品和异丙肾上腺素可在应急时提高心率,但药物治疗效果不佳且易有不良反应,仅适用于无起搏条件的紧急情况。

  3. 室内传导阻滞

    • 定义与组成:指希氏束以下部位的传导阻滞,室内传导系统由右束支、左前分支和左后分支构成,病变可累及单支、双支或三支。

    • 病因与临床症状:右束支传导阻滞较常见,通常无临床意义;左束支传导阻滞常因心肌弥漫性病变引发。单支、双支阻滞一般无症状,偶尔有第一、第二心音分裂;完全性三分支传导阻滞临床表现与完全性房室传导阻滞相同。

    • 心电图特征:右束支传导阻滞 QRS 波群≥0.12 秒为完全性,V1 导联呈 rsR′波形,V5、V6 导联呈 qRS 或 RS 波形,T 波与主波方向相反;左束支传导阻滞类似,V5、V6 导联呈 R 波形且顶部有切迹或粗钝;左前分支传导阻滞额面平均 QRS 电轴左偏,相关导联有特定波形;左后分支传导阻滞电轴右偏,相应导联波形有特征;双分支与三分支传导阻滞情况复杂,心电图表现多样。

    • 治疗:慢性单侧束支传导阻滞无症状者无需治疗;双分支与不完全性三分支传导阻滞不必常规预防性使用起搏器,出现晕厥等严重症状时应尽早考虑心脏起搏治疗。

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  1. CONNECT:[ UseTime:0.000527s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000708s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000327s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000262s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000483s ]
  6. SELECT * FROM `set` [ RunTime:0.000208s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000605s ]
  8. SELECT * FROM `article` WHERE `id` = 491044 LIMIT 1 [ RunTime:0.002544s ]
  9. UPDATE `article` SET `lasttime` = 1776420710 WHERE `id` = 491044 [ RunTime:0.001996s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000225s ]
  11. SELECT * FROM `article` WHERE `id` < 491044 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000394s ]
  12. SELECT * FROM `article` WHERE `id` > 491044 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000383s ]
  13. SELECT * FROM `article` WHERE `id` < 491044 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000742s ]
  14. SELECT * FROM `article` WHERE `id` < 491044 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002705s ]
  15. SELECT * FROM `article` WHERE `id` < 491044 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001880s ]
0.092348s