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心肌梗死(MI)复习要点

  • 2026-09-21 23:38:39
心肌梗死(MI)复习要点

一、定义

心肌梗死是在冠状动脉粥样硬化病变的基础上,冠状动脉供血急剧减少或中断,使相应心肌发生持久而严重的缺血,缺血超过20~30分钟即可造成心肌急性坏死。坏死心肌失去收缩功能,范围与闭塞血管的供血区域一致,最终被瘢痕组织取代。理解这一定义要抓住两点:一是病变基础在冠脉,二是结局是心肌坏死,这也是心肌梗死和心绞痛的实质区别。

二、分类

临床最常用的分法按心电图分为两类。ST段抬高型心肌梗死(STEMI)冠脉多为完全闭塞,血栓以纤维蛋白和红细胞为主,肉眼呈红色,心电图表现为ST段弓背向上抬高,治疗核心是尽快开通血管。非ST段抬高型心肌梗死(NSTEMI)冠脉多为不完全闭塞,血栓以血小板为主,呈白色,心电图没有ST段抬高,往往只有ST段压低或T波倒置,这类患者禁忌溶栓。同样放在急性冠脉综合征里的不稳定型心绞痛,心肌还没有坏死,肌钙蛋白不升高,三者由此区分。

病理上心肌梗死还分为几型:1型是斑块破裂或侵蚀引起的自发心肌梗死,最常见;2型是心肌供氧和耗氧失衡,见于严重贫血、低血压、冠脉痉挛等情况;3型是心源性猝死,来不及抽血化验;4型和5型分别与冠脉介入和冠状动脉搭桥手术相关。临床工作中按心电图分型用得最多,病理分型主要用于科研和规范表述。

三、症状

典型表现是胸骨后或心前区压榨样疼痛,范围约手掌大小,可向左肩、左臂内侧、下颌、后背放射。疼痛持续超过20分钟,休息或含服硝酸甘油不能完全缓解,这一点和心绞痛不同,也是鉴别的重要线索。患者常伴大汗和濒死感;发热多在发病后1~2天出现,体温一般38℃左右,是坏死物质吸收所致。下壁心梗刺激迷走神经,可以出现恶心、呕吐。需要警惕的是,老年人和糖尿病患者疼痛常不典型,可能只表现为上腹部不适、牙痛、呼吸困难甚至晕厥,问诊时容易漏掉,遇到这类主诉要常规做心电图。

四、体征

心率可快可慢,心律不齐提示有心律失常。心脏听诊第一心音低钝,可闻及第四心音奔马律,反映左室顺应性下降;心尖区出现收缩期杂音提示乳头肌功能不全,存在二尖瓣反流。左心衰时双肺底可闻及湿啰音,严重者满肺都是湿啰音;心源性休克则表现为血压下降、皮肤湿冷、尿量减少。透壁心梗后1~2周可闻及心包摩擦音,多属于梗死后综合征的表现。查体要重点盯住心率、血压、肺部啰音和心音变化,这些直接关系到并发症的判断。

五、心电图改变

STEMI的心电图有一个连续演变的过程。发病最初几分钟到几小时,T波高尖,称为超急性期,这个阶段往往被忽略。随后ST段弓背向上抬高,与T波融合成单向曲线,进入急性期,这是最有特征的表现,也是诊断和决定再灌注时机的主要依据。几天到两周内ST段逐渐回落,T波转为倒置,并出现病理性Q波,Q波宽度超过0.04秒,深度超过同导联R波的四分之一。数周以后ST-T基本恢复,Q波永久遗留,进入陈旧期。

定位上,前降支闭塞看前壁,对应V1~V4导联;回旋支闭塞看侧壁,对应Ⅰ、aVL、V5、V6导联;右冠状动脉闭塞看下壁,对应Ⅱ、Ⅲ、aVF导联。下壁心梗还要注意有无右室梗死,必要时加做V3R~V5R导联。记住供血血管和导联的对应关系,读图时才能快速判断罪犯血管。

六、生化指标

肌钙蛋白是诊断心肌梗死的金标准,发病2~4小时开始升高,10~24小时达峰,持续7~14天,敏感性和特异性都最高,心梗后即使过了几天,依然能靠它确诊。CK-MB发病4小时开始升高,16~24小时达峰,3~4天恢复正常,主要用来判断再梗死和再灌注是否成功,因为它回落得快,再次升高往往提示新的坏死。肌红蛋白发病1~2小时就升高,是所有标志物里最早的,但特异性差,骨骼肌损伤、剧烈运动都会让它升高,只能作为早期筛查的参考。诊断心肌梗死要求肌钙蛋白有动态升高或降低,并且至少一次超过正常参考上限的第99百分位,单看一次正常结果不能排除心梗。

七、鉴别诊断

主动脉夹层表现为撕裂样剧痛,疼痛一开始就达高峰,血压常很高且两上肢不对称,可以出现脉搏短绌,D-二聚体升高,超声或CT血管造影可确诊,这类患者绝对禁忌溶栓,用错药会致命。急性肺栓塞表现为突发胸痛、咯血、呼吸困难,心电图出现SⅠQⅢTⅢ,右心负荷加重,D-二聚体升高,多见于长期卧床或手术后患者。急性心包炎的疼痛与呼吸、体位有关,深呼吸加重,心电图ST段弓背向下抬高,不会出现病理性Q波,心肌酶不升高。气胸起病急,一侧胸痛伴呼吸困难,患侧呼吸音消失,胸片即可明确。急腹症以上腹痛为主,腹部有明确的压痛和反跳痛,心电图和肌钙蛋白正常。不稳定型心绞痛疼痛时间短,休息或含药能缓解,肌钙蛋白不升高,和NSTEMI的区别就在心肌有没有坏死。

八、急救处理

怀疑心梗的患者要立即停止活动、就地平卧,马上呼叫急救。可立即嚼服阿司匹林300毫克,舌下含服硝酸甘油0.5毫克,但收缩压低于90mmHg或怀疑右室梗死时禁用硝酸甘油,用了血压会掉得更快。吸氧只用于血氧饱和度低于90%的患者,并不常规给氧。建立静脉通道,持续心电监护,准备好除颤仪,胸痛超过10分钟不缓解应直接送胸痛中心。到达医院后尽快完成心电图,一般要求在10分钟内完成,这是判断能否溶栓、是否走介入流程的第一步,也是胸痛中心的核心质控指标。

九、治疗

再灌注治疗是整个治疗的核心,时间就是心肌。STEMI发病12小时内首选急诊冠脉介入,进门到球囊扩张的时间应控制在90分钟以内;没有介入条件且无禁忌时,尽早静脉溶栓,溶栓后60~90分钟要评估血管是否开通,失败则补救性介入。多支病变、左主干病变或介入失败可考虑搭桥手术。NSTEMI不溶栓,按危险分层决定是早期介入还是择期介入。

药物治疗方面,抗血小板用阿司匹林联合替格瑞洛或氯吡格雷双联抗血小板,PCI术中或溶栓后加用肝素抗凝。β受体阻滞剂如美托洛尔,没有禁忌应尽早使用,能降低死亡率。他汀类如阿托伐他汀强化调脂、稳定斑块,急性期就要用足剂量。前壁梗死或合并心衰的加用ACEI或ARB,LVEF低于40%的加螺内酯,这些都是有明确证据的用药。

并发症的处理同样关键。室颤要立即非同步电除颤,这是心梗早期猝死最主要的原因,监护病房里发现室颤的第一反应就是除颤,不要耽误。心源性休克用去甲肾上腺素升压,必要时主动脉内球囊反搏辅助。急性左心衰用呋塞米利尿、硝酸甘油扩血管,血压稳定时可加用西地兰。乳头肌断裂、室间隔穿孔这类机械并发症,内科治疗只是过渡,最终要靠外科手术解决。

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  1. CONNECT:[ UseTime:0.000470s ] mysql:host=172.18.0.4;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000976s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000381s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000346s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000528s ]
  6. SELECT * FROM `set` [ RunTime:0.000282s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000700s ]
  8. SELECT * FROM `article` WHERE `id` = 514752 LIMIT 1 [ RunTime:0.000388s ]
  9. UPDATE `article` SET `lasttime` = 1790044314 WHERE `id` = 514752 [ RunTime:0.001413s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000381s ]
  11. SELECT * FROM `article` WHERE `id` < 514752 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000498s ]
  12. SELECT * FROM `article` WHERE `id` > 514752 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000564s ]
  13. SELECT * FROM `article` WHERE `id` < 514752 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000604s ]
  14. SELECT * FROM `article` WHERE `id` < 514752 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000889s ]
  15. SELECT * FROM `article` WHERE `id` < 514752 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000694s ]
0.093979s