Hello!
Thank you for asking on HCM!
I understand your concern, and would like to explain that the situation, your grandad is experiencing is called "cognitive disorders". That situation is seen not infrequently after complex medical procedures, especially after
cardiac surgery.
There are many factors that impose such a behavior during surgery, such as advanced age, prolonged extra-corporeal circulation, potential acid-base disorders, multiple monitoring and intervening machines and other equipments that produce excessive
stress on the patient, many i/v lines, catheters, tubes, etc, attached to the patient, etc.
I would like to explain that these symptoms are generally transient. So don't worry!
Everything will be fine after a couple of days. You just need to talk to his doctor for more current information about the daily clinical status.
Hope to have been helpful to you. Greetings! Dr. Iliri