Mayo Clinic WCT (Wide Complex Tachycardia) Formula of May et al

Patient selection: wide complex tachycardia

Frontal and horizontal percent amplitude change (PAC) is a measure of percent (%) QRS amplitude change between paired WCT and baseline ECGs (May et al, 2019).

Parameters:

(1) WCT QRS duration in ms

(2) frontal percent amplitude change (PAC), in percent

(3) horizontal percent amplitude change (PAC), in percent

X =

= (0.0623 * (WCT QRS)) + (0.0279 * (frontal PAC)) + (0.0391 * (horizontal PAC)) - 14.4289

risk of ventricular tachycardia =

= 1 / (1 + EXP((-1) * X))

Performance:

• The area under the ROC curve is 0.96.