On in E.C.G tracing, the presence of right atrial hyperophy is suggested by -: (A) Tall spiky P wave, (B) Widened P wave, (C) Prolonged P-R interval, (D) Increased P-Q segment
Answer is A. 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