Hello and thanks for the query
If you have being told that your brother has blocked in 3 arteries of the heart and has gone to the hospital with chest pain
than surely he is suffering from Coronary Artery
Disease (Acute or chronic depending on the condition of the patient).
Now the decision for Byepass Surgery or angioplasty
depends on the site and length and number of the block present in the artery. Cardiologist who has done your Coronary angiography
is the best person to guide you which is best for you.
Usually in multiple block of three arteries of the heart Coronary Arteries Byepass Graft Surgery is advised but lot depend on the condition and fitness of the patient.
Consult your cardiologist for better guidance.