摘要
A 14-year-old male visited the Guangzhou Medical University First Affiliated Hospital of with a complaint of a 2-year history of progressive exertional dyspnea and fingertips cyanosis. Physical examination revealed remarkable desaturation measured by pulse oximetry （80% at rest） and marked cyanosis of lips.
A 14-year-old male visited the Guangzhou Medical University First Affiliated Hospital of with a complaint of a 2-year history of progressive exertional dyspnea and fingertips cyanosis. Physical examination revealed remarkable desaturation measured by pulse oximetry （80% at rest） and marked cyanosis of lips.
