[matz]

Prolonged QT

I think D is correct
most of the patient having transient loss of consiousness due to prolong QT syndrome are often mistaken by epilepsy who never respond to anticulvalsant drugs...

 

[matz]

True

I think Phenytoin is the answer. It causes ataxia which is the main reason she has difficulty in walking and the reason behind her fall.

I think ataxia caused by phenytoin is more reasonable, u r right...