In honor of Heart Month in February, Sunnybrook Health Sciences Center in Canada conducted a live event showing a coronary artery bypass graft. They showed everything from what happened when the surgical team opened up the patient’s chest, to when doctors stopped his heart, to when they stitched him up.
The surgery was conducted to improve blood flow to the heart of the patient, named Lou, after it was slowed by plaque due to coronary artery disease, the hospital said on its website. If such a surgery were not completed, the disease could have led to pain or a heart attack.
Sunnybrook live tweeted the surgery and took video of the heart in the opened chest cavity.
Watch the stunning six-second footage of the heart beating (content warning: this footage might be considered graphic):
And then here’s the moment where you can see the heart go from beating to stopped:
The patient, who was only identified by his first name and consented to the live tweeting of his surgery, is 57 years old and “looks forward to his recovery so he can get back to spending time with his family and return to his hobbies.”
For an even more detailed play-by-play, check out more of Sunnybrook’s Twitter stream.