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(3)????????????20???????????????????????1530????l2?????????

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(5)???????????????6?????????????????????????????6??????5?250????????????710?

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       ????y????????????????????????????????????????????
 
????????????????????????????????10-20?????????????????????????10.7Kpa80mmHg???????????????????1-2?????????????????convulsive syncope????????
 

??y?????????????
?head-up tilt test, HUT???????????...