患者男性,56岁。体检发现心尖部舒张期隆隆样杂音;胸片提示左房、右室增大,诊断为风心病二尖瓣狭窄。该患者属于( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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