ECG: wide QRS tachycardia (498/1700)

An ECG of an elderly lady who collapsed in the ED shows rapid ventricular rate of 220bpm,
QRS=140ms. What is the most probable dx?
a. Atrial fibrillation
b. VT
c. SVT
d. Mobitz type1 2nd degree heart block
e. Sinus tachycardia






































answer: B