Hemodynamic Variables and Effects of Balloon Inflation at Rest and During Hyperemia
Abbreviations: CFR, coronary flow reserve; FFR, fractional flow reserve; IMR, index of microvascular resistance; MRR, microvascular resistance reserve; Pa, mean aortic pressure; Pcs, mean pressure in the coronary sinus; Pd, mean distal coronary pressure; Pra, mean pressure in the right atrium; Tmn, mean transit time.The estimated adjusted between-conditions difference (sham-balloon) was 21 (95% CI, 14-28) mm Hg × s (All Randomization sequence, resting resistances, sex, and age did not affect the change in IMR caused by balloon inflation. The decrease in IMR after balloon inflation was largest in patients with the highest sham IMR (Coronary flow capacity was improved by balloon inflation (