心臟射出分率（ejection fraction, EF）的計算公式為：
A（end-diastolic counts－end-systolic counts）÷ end-diastolic counts正確答案
B（end-systolic counts－end-diastolic counts）÷ end-diastolic counts
C（end-diastolic counts－end-systolic counts）÷ end-systolic counts
D（end-systolic counts－end-diastolic counts）÷ end-systolic counts
答案與詳解
