Guilherme Marmontel Nasi, MD

Patient Feedback

4.996226 average rating from 106 reviews

• Very knowledgeable and easy to talk with

  2026-10-06

• I like Dr Nasi.

  2026-09-30

• Dr Nasi has been my favorite interaction so far!

  2026-09-28

• Dr. Nasi is very kind and very knowledgeable. He always knows what's been going on with my health records from other providers and I just appreciate the kind of person he is.

  2026-09-25

• Dr. [redacted] managed [redacted]'s cardiac care for many years. When he referred [redacted] to the heart failure clinic, we feared the loss of his wisdom and counsel. Due to the professionalism, competence and personality of Dr. Nasi, those fears were unfounded.

  2026-09-24

• This was the best doctor visit I have had. Dr. Nasi was thorough, knowledgeable, and listened. All questions I had prepared he answered without my asking them. He had obviously reviewed my history prior to my arrival. He wanted to know not only the diagnostic me but the day-to-day person that I was. Both my husband, who accompanied me, and I never felt rushed and agree it was an excellent visit. WDH-MGH is fortunate to have Dr. Nasi on staff.

  2026-09-23

• Dr Nasi explain everything very well. He also goes over everything very well.

  2026-09-19

• Hi, Dr. Guilherme Marmontel Nasi is a wonderful cardiologist. I respect him. He is very good. He is excellent. He is right on the dot with his predictions. He tells me how it is. I follow his instructions and he praises me when I follow what he needs me to follow. according to my care. But he is a wonderful, he's one of the best cardiologists and I wouldn't go anywhere else. He listens carefully, is very thoughtful, respectful, has great bed manners and I love my doctor.

  2026-09-11

• Dr. Nasi is one of the very best doctors I've ever seen. Since I have a congenital heart defect, I've seen innumerable doctors in my life. Dr. Nasi is a superior physician. He listens, takes time and addresses each of my concerns.

  2026-08-19

• I Iove him; he is caring, compassionate, and very perceptive with regard to my problem.

  2026-08-19

• Extremely satisfied. Im so thankful for Dr. Nasi and his team.

  2026-08-19

• They have done an Amazing job. I feel much better. I thank them all very much.

  2026-08-23

• I had Dr. Nasi. I have him all the time. He's my doctor. I don't want to change him. And I love him. He's right on with stuff that he talks to me about. We talk about a lot of different things. He helps me with my medical concerns. He listens to me. He has great bedside manners. I appreciate him so much.

  2026-08-14

• Dr Nasi is the best. Knowledgeable, helpful and friendly.

  2026-08-12

• Dr. Nasi is an excellent cardiologist and I'm honored to be his patient. He is very knowledgeable, experienced, and caring. He is a very important member of my healthcare team.

  2026-08-10

• Dealing with Dr. Nasi is always on point and a pleasure.

  2026-08-03

• Dr. Nasi is my best doctor. I would recommend him to anyone. I think he's probably the best doctor I've ever had.

  2026-07-31

• Dr. Nasi was a very good provider. He listened to everything I had to say. He was very compassionate, very thorough, went over all my tests, went over all my medications, went over any questions that I had. He was wonderful.

  2026-07-30

• I love Dr. Nasi. He listens well. He talks to me the way I can understand him and I would recommend him to anybody and I have plenty of times.

  2026-07-09

• Everyone at the Wentworth heart failure clinic is awesome to work with. I would highly recommend them to anyone. Extremely responsive and helpful.

  2026-07-08

• Great visit and follow up. [redacted]

  2026-07-06

• Excellent care.

  2026-06-30

• It was smooth and every one was nice !!

  2026-06-24

• Exceptional communicator., made me feel totally comfortable. Very thorough preparation, explanations, follow through. Thoughtful and caring.

  2026-06-18

• Dr. Nasi was very thorough. He listened to me as well as my daughter who attended the appointment with me. He gave me as much time as I needed. He did not rush with me. I was impressed by his kindness and caring.

  2026-06-16

• Dr. Nasi and his staff are very professional as well as very down to earth and extremely friendly.

  2026-06-08

• Always a god experience

  2026-06-07

• The Best Doctor

  2026-06-07

• Dr. Nasi is one of the most compassionate, knowledge physicians I am being treated by. He is by far one of the very best!!! I trust him with my Life.

  2026-06-03

• I should like to emphasize that the entire team at this cutting-edge Heart Failure clinic, from the moment a patient crosses the threshold, through any needed intake processing, onward through the top-flight, thorough and genuinely kind personal nursing assessment and supporting metrics; this fine team thereby consistently presents an exemplary briefing in support of the indicated specialist encounter, applicable prophylaxis options on offer, and further treatment plans applicable to the current status - the whole seamlessly partnered with a comprehensive and deeply caring patient communications program. Dr. Nasi, whom I saw on this latest visit, is no less than the embodiment of this world-class team of life-critical care givers (and I say this with first-hand experience as Dr. Nasi's patient!). My heartfelt thanks all around! [redacted]

  2026-06-07

• Dr. Nasi is one of the best doctors that I have ever had, reviews everything carefully, speaks with you person to person, top-notch, looks out for the patient, knows his subject matter. Can't rate it higher. If I could, I would. Thank you.

  2026-06-05

• Dr Nasi is as fine a physician as I have ever met.

  2026-06-04

• I am very happy to have Dr. Nasi and his staff for my cardiac needs.

  2026-06-03

• Excellent, professional doctor and staff.

  2026-06-01

• Dr Nasi is a great doctor. [redacted]

  2026-05-10

• Love them all!

  2026-05-06

• Excellent care team

  2026-04-26

• Doctor was prepared, having reviewed my case/profile the night before. He knew my history and was ready to see me in person!

  2026-04-21

• My experience has always been really good with this provider.

  2026-04-17

• Dr nasi is exceptional .

  2026-04-13

• Dr. Nasi is very kind, and has true concern for my health. He spends the time needed to make sure I understand next steps, and answer any questions I have.

  2026-04-11

• Hi, I trust Dr. Nasi with my life. He was the first, second cardiologist, but he was my hospitalist while I was staying at the hospital. And I couldn't trust a more thorough, more simply expressive and I understood him very well. He made it very clear. I ask questions. He answers it. And he has such wonderful bed manners. And I'm so glad that I've got to see him for a checkup as I have changed my cardiologist. And I'm very grateful to Dr. Nasi. He ordered every test that nobody was doing.

  2026-03-13

• Amazing doctor. 11/10. If we had more doctors like Dr Nasi the world would be a better place. Extremely thorough, intelligent, and compassionate. It's like he was built in a lab to be the perfect doctor - captain America style.

  2026-03-10

• He takes his time at your visit, makes eye contact and explains problems in understandable language.

  2026-03-09

• Good

  2026-03-04

• Dr Nasi was exceptional. Thorough, endlessly patient, knowledgeable, kind, and attentive. Truly wonderful visit on all levels

  2026-03-04

• I would recommend Dr. Nasi to any of my friends if they needed a cardiologist.

  2026-02-25

• Dr Nasi is a very caring practitioner. He is very familiar with my medical chart. He pays close attention to previous visits with him as well as any other visits from other doctors. He is well focused on my medical needs. He makes me feel comfortable. He discusses any tests results with me. He is ready to listen to any concerns I have. He is a great example of a doctor who truly cares about his patients. I feel very fortunate to have him as my cardiologist . I feel Mass General is very fortunate to have him as well. Hold onto that one...he's a good one!

  2026-02-22

• Thank you

  2026-02-22

• The nurse and Dr.Nasi were very open to my questions and totally answered all and every concerns. Very comforting

  2026-02-11

• Dr. Nasi is an incredibly nice man...he combines medical expertise with a personal touch that removes anxiety while offering detailed information and advice.

  2026-01-18

• Very thoughtful and deliberative. Directive and pleasing in a non-authoritarian way. I have inceredible respect for this physician.

  2026-01-14

• Very pleasant; knowledgeable; interested in my care and comments/questions

  2026-01-08

• Excellent care as always from this entire office!

  2026-01-06

• I am very pleased to have Dr. Nasi as my doctor

  2026-01-05

• Dr. Nasi is absolutely outstanding. He took a lot of time preparing for our visit and during the visit. He is pursuing all aspects of my situation.

  2026-01-05

• Dr Nasi in my opinion is the best Dr I've ever had and I have recommended him to my friends and family. My wife totally agrees with me as she as accompanied me on a couple of my appointments and has seen first hand why I truly care for this provider. My only fear is what if he leaves. I hope not ever!

  2026-01-04

• I was very impressed by Dr. Nasi. He took the time to explain things in a way that I could understand. He wasn't rushed. I was just very, very impressed.

  2026-01-01

• Doctor and nurses were fantastic. I love going to my appointments. Great people.

  2025-12-21

• Dr. Massey is the best doctor I have ever had. I'm [redacted] years old, so I've had a lot of them, and no one's come close.

  2025-12-04

• We feel so blessed to have Dr. Nasi and his staff! I could not wish for any better cardiologist and team to work with! I would rate him and his team A+!

  2025-11-23