Our UHN programs and services are among the most advanced in the world. We have grouped our physicians, staff, services and resources into 10 medical programs to meet the needs of our patients and help us make the most of our resources.
University Health Network is a health care and medical research organization in Toronto, Ontario, Canada. The scope of research and complexity of cases at UHN has made us a national and international source for discovery, education and patient care.
Our 10 medical programs are spread across eight hospital sites – Princess Margaret, Toronto General, Toronto Rehab’s five sites, Toronto Western – as well as our education programs through the Michener Institute of Education at UHN. Learn more about the services, programs and amenities offered at each location.
Maps & Directions
Find out how to get to and around our nine locations — floor plans, parking, public transit, accessibility services, and shuttle information.
Ways You Can Help
Being touched by illness affects us in different ways. Many people want to give back to the community and help others. At UHN, we welcome your contribution and offer different ways you can help so you can find one that suits you.
The Newsroom is the source for media looking for information about UHN or trying to connect with one of our experts for an interview. It’s also the place to find UHN media policies and catch up on our news stories, videos, media releases, podcasts and more.
Toronto (Oct. 22, 2021) – A new study from the Peter Munk Cardiac Centre reveals that patients who survive an aortic dissection often fail to receive comprehensive post-surgical follow-up care leaving them vulnerable to a lifetime of sustained risk. A dedicated aortic clinic has been created at the Peter Munk Cardiac Centre to provide patients with the life-long follow-up care they require.
"What we found in our study was that almost no one was receiving guideline-recommended imaging surveillance (GRIS) after dissection," says Dr. Jennifer Chung, Cardiovascular Surgeon, Peter Munk Cardiac Centre, Toronto General Hospital, University Health Network. "These patients are at ongoing risk for aortic complications, reintervention, and death. It is important to know that these risks do not subside over time."
An aortic dissection occurs when blood rushes through a tear in the aorta, causing it to split or dissect. This life-threatening event requires emergency surgery. Surviving an aortic dissection carries a lifetime of sustained risk.
Dr. Chung's study, published Oct. 22 in the
Journal of the American College of Cardiology, examined 888 Ontarians who survived urgent aortic dissection repair between April 1, 2005 and March 31, 2018. If one survives the surgery, the mortality rate was four per cent after one year, 14 per cent at five years, and 29 per cent at 10 years. The study also showed that the rate of surveillance imaging dropped to 21 per cent just 2 years post-surgery, and at eight years, it was less than two per cent.
Dr. Chung, who was the senior author of the study, says that unlike other similar procedures – such as endovascular aneurysm repair – patients who have undergone aortic dissection repair are "orphaned" in follow-up, unclear of who is managing their aortic care going forward.
Other factors contributing to the lack of consistent follow-up care include distance between the patient's residence and the referral centre where they received surgery, and misconceptions surrounding the durability of the repair.
Addressing this lack in comprehensive post-surgical follow-up is why Dr. Chung has established the Thoracic Aortic Surgery Clinic within the the Peter Munk Centre of Excellence in Aortic Disease.
"Our clinic is multidisciplinary - it includes a range of aortic experts, including cardiac surgeons, vascular surgeons, and interventional radiologists," explains Dr. Chung. "We follow patients with aortic dissections and aortic aneurysm who may need ongoing imaging surveillance and possibly even surgery down the road. By providing clear and accessible follow-up, we hope to prevent future aortic catastrophe."
The study followed 888 Ontarians who survived urgent aortic dissection repair between April 1, 2005 and March 31, 2018. Median age of the cohort was 61 years (51-71), and 70 per cent were men; 87 per cent lived in urban areas.
Mortality rate post aortic dissection repair:
Instance of re-intervention (urgent or elective surgery):
68 per cent of these cases were urgent and carried a 9 per cent 30-day mortality rate.
Re-intervention or death for the entire cohort was:
Guidelines recommend imaging surveillance at one, six and 12 months, and then annually, following aortic dissection repair. Overall, only 14 per cent of patients followed the guidelines.
Read the full paper
The Peter Munk Cardiac Centre (PMCC) opened in 1997 through the generous support of Peter and Melanie Munk. A global leader in cardiovascular care, with internationally-renown medical expertise, PMCC has some of the best patient outcomes in the world and is home to many world firsts that span cardiac and vascular research and discoveries. Canada's premier cardiac centre is part of the University Health Network (UHN) and located at the Toronto General Hospital in Toronto, Ontario, Canada. For more information, visit:
University Health Network consists of Toronto General and Toronto Western Hospitals, the Princess Margaret Cancer Centre, Toronto Rehabilitation Institute, and The Michener Institute of Education at UHN. The scope of research and complexity of cases at University Health Network has made it a national and international source for discovery, education and patient care. It has the largest hospital-based research program in Canada, with major research in arthritis, cardiology, transplantation, neurosciences, oncology, surgical innovation, infectious diseases, genomic medicine and rehabilitation medicine. University Health Network is a research hospital affiliated with the University of Toronto.
For media inquiries, please contact:
Senior Public Affairs Associate, University Health Network
Phone: 437 217 2819