3rd class medical exams are required every 5 years for private pilots under the age of 40. Airline pilots under 40 are required to have a 1st class medical every year. They are required to get an EKG before they turn 35. Over the age of 40 they need a 1st class medicals every 6 months and an EKG every year.
My brother like most pilots is over 40. His swollen and inflamed heart was discovered not by an EKG but by a doctor performing the standard 1st class medical that was performed shortly after he received the vaccine.
I think you should review what the flight surgeon said to Tucker.
Thanks for the update and clarification.!!!