Systole Diastole 12 Extravascular compression Impairs器 coronary blood flow during systole sovo| uic contraction phase↓↓→ rapid ejection phase↑→ reduced ejection phase↓→ diastolic phase↑ 0 (isovolumic relaxation phasett) E≥=oo0 0 0.6 ime(sec)Extravascular compression impairs coronary blood flow during systole Isovolumic contraction phase ↓↓→ rapid ejection phase ↑→reduced ejection phase ↓→ diastolic phase ↑ (isovolumic relaxation phase↑↑)