Japanese Emperor Akihito will undergo heart bypass surgery this week after a detailed examination found a heart problem had worsened, the Imperial Household Agency was quoted as saying on Sunday.
Kyodo news agency, quoting the Imperial Household Agency, said the emperor, 78, would have the surgery on February 18.
Akihito had undergone an angiogram on Saturday which showed that blood vessels had narrowed over the past year. He had been treated in hospital for three weeks in November for cold, fever and symptoms of bronchitis.
The Imperial Household Agency was unavailable for comment.
Kyodo said the test was performed after the emperor experienced difficulty while engaging in light exercise. (AP)
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