A 15-month-old male infant, who was found to have a cardiac mass during the fetal period, was re-examined after birth and showed cardiac rhabdomyoma (possible?). The mass gradually became larger with the growth and development, resulting in left ventricular outflow tract stenosis. He was scheduled for cardiac rhabdomyoma resection and left ventricular outflow tract evacuation surgery. When the left ventricular outflow tract is obstructed, the diastolic period is relatively shortened, the left ventricular myocardium becomes hypertrophy, the compliance at the end of diastole is reduced, the pressure at the end of diastole is increased, and the filling of the left ventricle is hindered. In addition, left ventricular myocardial hypertrophy can also lead to myocardial coronary vascular remodeling, resulting in a decrease in myocardial blood supply per unit volume, especially a reduction of endocardial blood supply. How to improve or maintain coronary blood supply as much as possible and reduce myocardial oxygen consumption is the focus of perioperative management.