Figure 7From: Pacing stress echocardiographyTime sequence during stress. The FFR can be defined as: upsloping when the peak stress pacing SP/ESV index is higher than baseline and intermediate stress values; biphasic with an initial upsloping followed by a later downsloping trend; and flat or negative when peak stress pacing systolic pressure/end-systolic volume index is equal or lower than baseline stress values.Back to article page