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Indu Deglurkar knew she wanted to be a heart surgeon when she was seven years old.
She is now internationally-renowned, working between 85 and 120 hours a week, and while her intricate open-heart surgeries usually happen behind closed doors, cameras have now been invited in.
Prof Deglurkar said the longest she has spent in the operating theatre was 37 hours with an "extremely unusual" case.
The life-saving work of surgeons is being revealed in series two of Saving Lives in Cardiff.
