I was wondering if anyone else has experienced this, kind of like when a small child has been crying/sobbing and is recovering and they have a shuddering, stuttering or "catching" intake of breath? Related to Imbruvica? it doesn't happen all the time, coming in spells at times. My P.A. says the it happens sometimes when red cells are being destroyed, but blood work shows nothing. First noticed when my white blood cell count got high >90K. It is a little disconcerting and I decided to actively search, a "shuddering breath" search shows lots of questions and not many answers.