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A 12-year-old girl died three days after undergoing heart surgery at a Tokyo hospital in March due to brain damage caused when an artificial heart-lung machine malfunctioned during the operation, sources close to the case said Saturday.

Akika Hirayanagi, the daughter of dentist Toshiaki Hirayanagi, from Takasaki in Gunma Prefecture, slipped into a coma after cardiopulmonary pumps stopped functioning for between 15 and 20 minutes during an operation on March 2 at the Tokyo Women’s Medical University Hospital in the capital’s Shinjuku Ward.

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