ECG is very insensitive in picking up PE, there are n number of ECG findings , such as sinus tachycardia, rtward QRS axis, RVH, RBBB, s1q3t3, sometimes rt sided leads show ST elevation, diffuse ST- T changes due to global ischaemia due to large thrombus causing hypoxia etc..but the most specific finding is simultaneous inversion of T waves in inferior and rt ward oriented chest leads. in one series it was found to be 99 percent specific!!!
