<prompt> In left sided massive pneumothorax, ECG shows all, except-Left axis detionAbsent R wavePeaked P wavePrecordial T wave inversion  <response>: Abnormal left axis detion in left-sided pneumothorax. Relevant QRS abnormalities incomplete RBBB and T-wave inversion in10. QRS amplitude in V2-V6 leads was significantly decreased in left-sided pneumothorax. Ref Harrison 20th edition pg 1546 