Which is not a finding in a massive left sided pneumothorax?: (A) Absent R wave, (B) T wave inversion, (C) ST segment change, (D) Left axis detion
Answer is D. The ECG pattern in the left sided group has been more conspicuous and more striking, and has consisted of a lower voltage of QRS-1, flattening of T waves in Lead 1, a change in the contour of QRS complexes in the chest leads, and a definite inversion of T waves in the chest leads; these T wave inversions being the most constant and conspicuous of all changes. There will be right axis detion with Q waves in the anterior leads. It may mimic acute myocardial infarction. The ECG pattern in the right sided group has been mainly depression of QRS-1, and depression of P waves in the limb leads. T inversion has been notably absent.