<prompt> The following ECG shows:Ventricular bigeminiP. pulmonaleElectrical alternansWrong calibration  <response>: ANS. AThis was not the exact ECG asked. But the options were the same.P. pulmonaleCriteria: A 2.5 mm in inferior leads 2, 3, AVFB 1.5 mm in VI and V2Electrical alternans1. Consecutive normally conducted QRS complexes in height2. Seen in pericardial effusion. 