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10-5:心肌负荷试验(代码377)

  • 2026-02-05 00:57:11
10-5:心肌负荷试验(代码377)
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以下为《第十章第五节:心肌负荷试验》的部分练习题:

1、正常冠状动脉在运动负荷时,其血流量较静息时增加()

A.7~9倍

B.1~2倍

C.5~7倍

D.3~5倍

E.以上均不对

2、关于正常人运动负荷门控心血池显像,测得的LVEF较静息时应至少增加()

A.2%

B.5%

C.8%

D.10%

E.15%

3、运动负荷试验,常用的终止指标包括()

A.血压

B.检查者的自觉症状

C.预期心率

D.A、B、C均是

E.A、B、C均不是

4、药物负荷心肌灌注显像中,双嘧达莫的作用机制为()

A.双嘧达莫能使小静脉扩张

B.使所有冠状动脉扩张

C.双嘧达莫能提高冠脉血液中及组织中的腺苷浓度

D.血管扩张是由于双嘧达莫直接作用引起的

E.能使心肌耗氧量增加

5、双嘧达莫负荷心肌灌注显像时,注射双嘧达莫过程中出现明显、持续的心绞痛,此时应用下列哪种药物拮抗?()

A.利多卡因

B.硝酸甘油

C.氨茶碱

D.阿托品

E.硝酸异山梨酯

6、对于心肌灌注负荷显像的描述,对于多巴酚丁胺试验的描述正确的是()

A.多巴酚丁胺作用机制与腺苷相似,可以抑制细胞对腺苷的重吸收,使血管扩张

B.多巴酚丁胺是一种负性肌力作用的药物

C.多巴酚丁胺作用机制与运动试验相似,可使冠状动脉血流量增加2倍

D.主要作用于心肌β₂受体,使心率加快,收缩压升高,心肌收缩力增强,心肌耗氧量增加

E.多巴酚丁胺可以使狭窄的冠状动脉血流量也增加,缓解症状

7、关于硝酸甘油介入试验,在舌下含服硝酸甘油多长时间后注射显像剂?()

A.20分钟

B.1分钟

C.10分钟

D.5分钟

E.30分钟

8、心肌灌注显像时,运动负荷局部放射性稀疏、缺损,静息时放射性分布正常。这种情况多见于()

A.心肌缺血

B.心肌梗死

C.心肌梗死+心肌缺血

D.心肌病或心肌炎

E.瓣膜病

9、心肌灌注显像时,运动负荷局部放射性稀疏、缺损,静息时放射性无变化。这种情况多见于()

A.心肌缺血

B.心肌梗死

C.心肌梗死+心肌缺血

D.心肌病或心肌炎

E.瓣膜病

10、心肌灌注显像时,运动负荷局部放射性稀疏、缺损,静息时放射性分布部分恢复。这种情况多见于()

A.心肌缺血

B.心肌梗死

C.心肌梗死+心肌缺血

D.心肌病或心肌炎

E.瓣膜病

11、心肌灌注显像时,运动负荷局部放射性弥漫不均,静息时放射性分布弥漫不均。这种情况多见于()

A.心肌缺血

B.心肌梗死

C.心肌梗死+心肌缺血

D.心肌病或心肌炎

E.瓣膜病

答案:DBDCC,CDABC,D

1.解析:如果给患者一定量的运动负荷,正常的冠状动脉为适应心肌氧耗可增加其血流量达3~5倍,而有病变的冠状动脉血流量不能相应增加

3.解析:终止运动的指标:①达到预期心率(次/分钟):190(或195)-年龄(即次极量);②心电图ST段水平压低或下斜型压低≥1mm;③心绞痛发作;④血压异常升高≥28kPa或血压下降幅度≥1.3kPa;⑤出现严重心律失常如频发室性心动过速;⑥患者极度疲劳

7.解析:舌下含服硝酸甘油0.6mg,5分钟后静脉注射心肌灌注显像剂。硝酸甘油也是可以做负荷试验的,属于补充内容,职称教材里没有提到

8.解析:人体心脏具有很强的储备功能,即使冠状动脉狭窄达到70%时,由于冠状动脉自身调节作用,在静息心肌灌注显像图上看不到血流降低;但是在冠状动脉狭窄达40%左右时,心脏的储备功能实际上已受损害,如果给患者一定量的运动负荷,正常的冠状动脉为适应心肌氧耗可增加其血流量达3〜5倍,而有病变的冠状动脉血流量不能相应增加,导致局部心肌血流灌注不足和心肌氧供需的不平衡,这时在心肌灌注显像图上表现为放射性稀疏、缺损区。

9.解析:心肌梗死时负荷与静息心肌显像图上见到同一部位均呈放射性缺损区,形态大小一致。

10.解析:负荷图像上的放射性缺损区,在静息图像上有部分填充,表示心肌缺血+心肌梗死。

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  1. CONNECT:[ UseTime:0.001024s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001467s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000620s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000667s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001340s ]
  6. SELECT * FROM `set` [ RunTime:0.000604s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001347s ]
  8. SELECT * FROM `article` WHERE `id` = 472739 LIMIT 1 [ RunTime:0.010423s ]
  9. UPDATE `article` SET `lasttime` = 1770460407 WHERE `id` = 472739 [ RunTime:0.001393s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000660s ]
  11. SELECT * FROM `article` WHERE `id` < 472739 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.014740s ]
  12. SELECT * FROM `article` WHERE `id` > 472739 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005663s ]
  13. SELECT * FROM `article` WHERE `id` < 472739 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011535s ]
  14. SELECT * FROM `article` WHERE `id` < 472739 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003434s ]
  15. SELECT * FROM `article` WHERE `id` < 472739 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002867s ]
0.225380s