RVH is diagnosed on ECG in the presence of a R/S ratio of greater than 1 in lead V1 in the absence of other causes, or if the R wave in lead V1 is greater than 7 millimeters tall. The strain ...

The R wave is large in lead V1. Turn the ECG upside down and you will see ST segment elevation in V1 and a large Q wave which are normal findings of a myocardial infarction. For a detalied review ...