Hello Dan, I did not have to do a waiver or a PEB. I believe a lot depends on the type of surgery and circumstances along with any lasting complications. AR 40-501 para 3-2 states that:
Trial of duty and profiling for cardiovascular conditions:
a. Trial of duty will be based upon a cardiologist’s recommendation when the individual is asymptomatic without
objective evidence of myocardial ischemia, and when other functional assessments (such as coronary angiography,
exercise testing, and newly developed techniques) indicate it is medically advisable.
b. Prior to commencing the trial of duty period, an evaluation will be accomplished in all cases and a physical
activity prescription on DA Form 3349 will be provided by the cardiologist. The results of the trial of duty will include
the individual’s interim history, present condition, prognosis, and the final recommendations. If the Soldier successfully
completes the trial of duty, is considered a New York Heart Association Functional Class I, AND there are no physical
or assignment restrictions, the Soldier may be returned to duty without referral to a MEB. If the Soldier has any
physical restrictions after the trial of duty; he/she should be referred to an MEB. In addition to the documented results
of the trial of duty, a detailed report from the commander or supervisor clearly describing the individual’s ability to
accomplish assigned duties and to perform physical activity will be incorporated into the MEB record. The results of
the MEB and an updated DA Form 3349 will then be forwarded to a PEB if the Soldier does not met medical retention
standards. For RC Soldiers not on active duty, the trial of duty may consider performance in the Soldier’s civilian
position, as well as any military duty that may have been performed in the interim
There are several paragraphs in AR 40-501 that deals with heart surgery and after affects. It can be very confusing and contradicting. I think a lot depends on where you are stationed and if the medical staff have an obvious bias concerning AVR's and surgery, and if you are able to return to full active service without restrictions.
Hope this helps and sorry it took me a while to respond.