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

A 72yo man is found to be not breathing in the CCU with the following rhythm. What is the most
likely dx?

vf

a. SVT
b. VT
c. VF
d. Atrial fib
e. Atrial flutter

answer: C