ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Open heart surgery. Surgeon performing open heart surgery. The tubes over the patient's body lead to a heart-lung machine, which maintains the patient's circulation while the heart is temporarily stopped. Open heart surgery may be used to perform a heart bypass graft, valve replacement surgery or a number of other operations on the heart or its blood vessels.
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