For almost 60 years, bypass has meant a surgeon dividing your breastbone. A trial led out of Ottawa says that no longer has to be the only route in.
If you are facing heart surgery, the part that frightens people is rarely the heart. It is the breastbone. Bypass has meant splitting the sternum, the flat bone down the centre of your chest, then weeks of slow healing around it. New Canadian-led research says minimally invasive bypass surgery, done through a small incision between the ribs, holds up against the classic operation.
What did the MIST trial actually test?
The MIST trial, short for Minimally Invasive compared to STernotomy, was led by Dr. Marc Ruel of the University of Ottawa Heart Institute and published in The Lancet01288-2/abstract) on July 31. Randomised means patients were assigned to one operation or the other by chance, which is what makes the comparison trustworthy. It enrolled 170 patients with multiple blocked arteries across six countries, running from 2018 to 2024.
How safe is a coronary artery bypass through the ribs?
A coronary artery bypass reroutes blood around a blocked artery using a vessel taken from elsewhere in your body. The plumbing is identical either way. What changed is the door. Patients with the smaller incision needed fewer blood transfusions and less time on a breathing machine, while pain levels and hospital stay were similar. Ruel told CBC News it is the first time any minimally invasive heart surgery has matched, and in places beaten, the classic approach.
Whose recovery after heart surgery actually improves here?
Nobody can walk in next week and request minimally invasive bypass surgery. Dr. Stephen Fremes of Sunnybrook Health Sciences Centre in Toronto, who was not involved, noted that cardiac surgery has been slow to adopt minimally invasive methods, and said the findings show the approach is possible in centres with surgeons dedicated to learning it, not that it is ready everywhere. Ruel agrees it suits some patients and not others. Still, recovery after heart surgery is where the difference lands, and in your seventies, weeks matter.
Can you get ahead of coronary artery disease yourself?
The best version of heart surgery is the one you never need. Coronary artery disease builds over years through numbers your care team can track: blood pressure, cholesterol, blood sugar, smoking and family history. If those are overdue, or you have chest tightness or breathlessness that makes no sense, book sooner. Our guides to cholesterol that stays high on a good diet and blood pressure readings that keep moving are a good start.
What else do readers ask about this trial?
Can you get minimally invasive bypass surgery across Canada?
Not widely. Minimally invasive bypass surgery is performed at selected centres with surgeons trained specifically in the technique, and the researchers stress it is not yet ready for routine use everywhere. If you are facing bypass, ask your cardiologist or surgeon whether you are a candidate and where in Canada the procedure is being done.
Is the smaller incision less safe?
The trial found it as safe as the standard operation at one year, with fewer transfusions and less time on a ventilator. Safety depends heavily on surgical experience, which is why the authors frame the results as evidence for centres with dedicated expertise rather than a green light for every hospital.
Who does the less invasive approach rule out?
Suitability depends on your anatomy, where your blockages sit and your overall health. The lead researcher has been explicit that the operation is not right for every patient and that effectiveness has to come before the size of the scar. That decision belongs to you and your surgical team together.
Ask your doctor for your heart numbers
Encouraging research is no substitute for knowing your own numbers. If your last checkup is a blur, book a walk-in clinic or family doctor on Medimap, and the Health Hub has more on preventing heart disease before it needs a surgeon.
General information, not medical advice. Do not delay care based on this article. If you have chest pain or symptoms of a heart attack, call 911.
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