Although the cause of syncope can be life-threatening （e.g., ventricular tachycardia） and the result can be devastating （e.g., fractured hip）, a definitive explanation for syncope is found less than one half of the time.
Although the cause of syncope can be life-threatening （e.g., ventricular tachycardia） and the result can be devastating （e.g., fractured hip）, a definitive explanation for syncope is found less than one half of the time.
虽然晕厥的病因可能危及生命（如室性心动过速），并会产生严重后果（如髋部骨折），但说得清楚的晕厥却不到一半。