Regarding medical fitness

If a person is suffering with high risk cardiac problem like congestive heart failure. Cardiomyopathy. High risk of trans ischemic attack .low ejection fraction with on medication ..is it allowed in Bahrain ministrey under the rules of ministery of health to work in Bahrain.

They have issues with infectious diseases which is what is being tested for at the time of the visa medical.

My husband suffered with congestive cardiac problem. Is he eligible to work in Bahrain

Already told you what they test for.   They don't do ECGs etc.