单项选择题

张先生因胸痛进急诊,HR:180次/分,且可触摸到脉搏,BP:60/35mmHg,下列措施何者最适当?()

A.amiodaron 150 mg IV drip 10 minutes
B.adenosine 6 mg IV push
C.synchronized cardioversion
D.360joules defibrillation