Segmental force for each of the 3 segments (LN, RN, LR) for single and double ring (mid-systole–mid-diastole). (A) Level of the annulus. (B) Level of the STJ (mean ± standard deviation). LN: left/non-coronary segment; LR: left/right-coronary segment; RN: right/non-coronary segment; STJ: Sinotubular junction.