Our expert says:
Deoending on the exact surgical procedure, the experience and skill of the wole team involved, etc., it is possible that in some cases there might be a relative shortage of oxygen to the brain or some other physical but very mild brain damage, otherwise ( sometimes as well ) there is reasily a major psychological shock involved in experiencing such major surgery. And pure depression is indeed quite common following heart surgery, and can cause such symptoms, too. This can make a person more irritable and thoughtless in social interactions.
Does he notice anything changed ? ( He'd need to be asked about this very delicately ) - are there things he finds more difficult since the operation, including worse concentration, and irritability ? He may be persuaded to see a psychiatrist or perhaps a neurologist for a proper assessment of his mental state, and there could be treatments that could remedy this, depending on the identified diagnosis.
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