OP, with regard to the UK CAA only what you are possibly looking for is this. from
https://www.caa.co.uk/Aeromedical-Ex...m-examination/
(3) For a class 1 medical certificate, an extended cardiovascular assessment shall be completed at the first revalidation or renewal examination after age 65 and every 4 years thereafter. 2.2 The extended cardiovascular assessment should be undertaken at an AeMC or may be delegated to a cardiologist.
(Basically it involves a 4 yearly Exercise ECG and a clinical review and report by a Cardiologist).