My father has renal artery stenosis--should he consider having an angiography/angioplasty?

Possibly yes: If he has severe hypertension not well controlled on multiple medications and/or deterioration in renal function in the setting of high grade renal artery stenosis, then renal artery angioplasty may be very beneficial. Consultation with a nephrologist and vascular surgeon is indicated. Good luck!

RX for RAS: For over 50 years I have only had good results in fixing a RAS when a proper study which measure renin in each renal vein shows rather the blocked kidney is making too much renin. Recent studies from Australia have documented what we found over 30 years ago. So don't mess with the kidney unless it is making too much renin.