The constricting effect of reduced coronary artery compliance on the left ventricle is an important cause of reduced diastolic function in patients with coronary heart disease

Fig. 1. Study design and patients. a Control group, b coronary artery atherosclerosis group, c coronary artery atherosclerotic heart disease group, d PCI group

Fig. 2. Association between age and T in the A group. The effect of age on diastolic function was explored by grouping patients in the control group by age. A one-way ANOVA on the five groups showed F = 13.893, p < 0.001; multiple comparisons showed no statistically significant difference in T-values between groups 2 and 3 (p = 0.714); the remaining groups showed statistically significant differences

Fig. 3. Comparison of coronary CT, left ventricular pressure profile and coronary pressure profile data before and after PCI in a patient with coronary artery disease. The patients treated with PCI intervention, whose left ventricular pressure as well as coronary pressure profiles were preserved and coronary CT was performed to obtain a more comprehensive data on the patient's left ventricular diastolic function. a Coronary Artery CT was performed Preoperatively. b Coronary Artery CT was Performed 1 Day after stent implantation. c Coronary Artery CT was Performed 1 Year after stent implantation. d Left ventricular pressure curve. ① represents pre-procedure period, ② represents the immediate post-procedure period, ③ represents one year after the procedure. e Coronary pressure curve. ④ represents pre-procedure period, ⑤ represents the immediate post-procedure period, ⑥ represents one year after the procedure

Fig. 4. Single stent-LV diastolic function and coronary artery compliance. a We recorded T values from patients with LAD, LCX and RCA single stent implantation before, immediately after and one year after the procedure and used line graphs to visualize the relationship between T values and stenting site. b The maximum rate of coronary pressure drop in the immediate postoperative period in patients with LAD stenting was selected as an indicator of coronary artery compliance and thus compared to an indicator of left ventricular diastolic function

Fig. 5. The correlation between T and stent length. a To investigate the relationship between stent length and T at different implantation sites and whether there are differences between implantation sites. And T-values are measured in the immediate post-operative period. b Patients with LAD stents were divided into three groups according to the length of the stent, using a cut-off of 24 mm and 36 mm, in order to visualize the change in T values between these groups. T-values are measured in the immediate post-operative period. c The total stent length was calculated for each patient with LAD implanted stent. Patients with LAD, 2LAD, and 3LAD were divided into three groups using a 24 mm and 36 mm stent length cut-off to visualize the relationship between T and stent length. T-values are measured in the immediate post-operative period

Fig. 6. ROC curve. The upper limit of normal values of T was used as a cut-off for the group. And patients with LAD stents were divided into normal and abnormal groups. The T values of both groups were analysed by ROC curves to determine the threshold length of the stent that could cause abnormal T values in LAD implanted stents