I suspect he has a small pericardial effusion with a mild restrictive pericarditis. The scar tissue devevlopes anytime there is an incision which heals. Some people heal with more scar tissue than others. I believe he will undergo a pericardial window proceedure to relieve any "tamponade" effect. Since the fluid has built up over several months, it means there is no real imminent tamponade or constriction of movement of the heart as it fills just prior to each beat of the left ventricle. The removal of the fluid allows the proper motion of the heart within the sac. If the sac is "tethered" or "adheised" to the myocardium, it will restrict the motion of the pump and therefore diminish cardiac output.
Yeah, that's what I thought too....(LOL)..
sw