Heart surgery. Image 3 of 24. Surgeon using an electric saw to open a patient's chest during heart surgery. He is also using a metal retractor to pull back the skin and allow easier access. The surgeon, who is wearing magnifying lenses over his glasses, is cutting through the breastbone, or sternum. This chest is being opened to perform heart valve replacement surgery. For a sequence showing the operation, see images M560/494 to M560/517.
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