问题
单项选择题
In caring for a client with vasovagal syncope, the nurse should know that the associated temporary loss of consciousness is most commonly related to
A．vestibular dysfunction.
B．sudden vascular fluid shifting.
C．postural hypotension.
D．bradyrhythmia.
答案
参考答案：D
解析：Parasympathetic hyperactivity leading to sudden hypotension secondary to bradyrhythmia causes vasovagal syncope. That is, bradyrhythmia leads to cerebral ischemia which, in turn, leads to syncope. Vasovagal syncope isn't caused by vestibular (inner ear) dysfunction, vascular fluid shifting, or postural hypotension.