Wide QRS duration is-: (A) >0.8sec, (B) >0.9sec Pattern), (C) >.12sec, (D) All the above
Answer is C. a wide qrs complex by definiton is more than 120 ms The QRS complex duration is wide (>0.12 seconds or 3 small boxes) in every lead. Causes of a widened QRS complex include right or left BBB, pacemaker, hyperkalemia, ventricular preexcitation as is seen in Wolf-Parkinson-White pattern, and a ventricular rhythm. Ref Harrison 20th edition pg 1576