Dr. Viswanathan is a well known cardiologist in Mumbai. He is attached to many leading hospital like Jaslok, Breach candy hosp. etc.Excellent in diagnosing and his treatment is equally commendable. My husband is his patient and he saved my husband when he had Myocardial infarction. He has done Angioplasty on my husband in 1998 successfully . My husband is leading a normal life now. Still going for follow up and taking medication as per his instruction. I strongly recommend him for any cardiac problem.