<prompt> On in E.C.G tracing, the presence of right atrial hyperophy is suggested by -Tall spiky P waveWidened P waveProlonged P-R intervalIncreased P-Q segment  <response>: Right atrial enlargement produces a peaked P wave P pulmonale with amplitude: 2.5 mm in the inferior leads II, III and AVF 1.5 mm in V1 and V2 Ref : Harrison 20th edition pg 1583 