Wenckebachk phenomenon is defined as -: (A) Progressive lengthening of PR, (B) Slurred QRS complex, (C) Irregular hea rate & permature ventricular beats, (D) Shoened ST intervals
Answer is A. wenkebach phenomenon is the progressive lengthening of PR i nterval seen in mobitz type 1 AV block. Ref Harrison 20th edition pg 1436