?????

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

??y?????????????
?head-up tilt test, HUT???????????????????
????????????????????N???????????????????????????????????????????N???????/???????????y???????????
 
???????????????????????
1?<6.7Kpa50mmHg??<10.7Kpa80mmHg???25%?
2?4-6?<75/?6...