Welcome to HCM
Your wife is Diabetes
Type II with Chronic Renal Failure
and heart disease
for which she has undergone angioplasty
She has multiple problems which can cause breathing problems :
1) Her kidneys are not functioning so she has fluid retention in body specially lungs can cause and renal failure causes acidosis which can cause rapid breathing.It depend up on what is the level of blood urea and creatinine
2) If she has poor cardiac function congestion in lungs can occur.
3) If she has any lung problem like asthma or airways disease.
Please discuss with your treating what is the cause in her case and how much it can be improved with drugs and HD.
If he cardiac function is poor with angioplasty some improvement can occur.