Table 5.

The partial correlation coefficient between the circulation and right ventricular function adjusted based on the size of the pulmonary artery. After adjustment of the area of the MPA, the partial correlation between the short-axis proximal MPA and RV measurement was not significant. Partial correlation analysis after adjustment based on the diameter of the MPA showed a significant correlation between the counterclockwise Min circulation in the short-axis distal MPA and RVEF. Partial correlation analysis, after adjustment based on the area of the MPA, showed a significant correlation between the clockwise longitudinal circulation and RVEF, RVEDVi, and RVESVi.

Adjusted parameter	MPA-Area max						MPA diameter max						MPA-Area max + MPA diameter max
Circulation	RV EF		RV EDVi		RV ESVi		RV EF		RV EDVi		RV ESVi		RV EF		RV EDVi		RV ESVi
	ρ	P	ρ	P	ρ	P	ρ	P	ρ	P	ρ	P	ρ	P	ρ	P	ρ	P
Short-axis proximal
CW
Max	− 0.33	0.17	0.30	0.22	0.44	0.06	− 0.17	0.48	0.47	0.04	0.51	0.02	− 0.33	0.17	0.31	0.21	0.44	0.07
Min	− 0.34	0.06	0.05	0.85	0.28	0.25	− 0.35	0.14	0.18	0.46	0.35	0.14	− 0.41	0.09	0.11	0.66	0.32	0.19
Integral	− 0.39	0.10	0.28	0.24	0.44	0.06	− 0.21	0.39	0.47	0.04	0.51	0.03	− 0.43	0.07	0.26	0.30	0.43	0.08
CCW
Max	− 0.38	0.11	− 0.02	0.93	0.19	0.43	− 0.17	0.48	0.29	0.23	0.34	0.16	− 0.36	0.14	0.03	0.92	0.22	0.37
Min	− 0.53	0.02	− 0.06	0.80	0.18	0.45	− 0.46	0.05	0.08	0.76	0.27	0.26	− 0.50	0.04	0.05	0.84	0.26	0.29
Integral	− 0.36	0.13	0.05	0.84	0.20	0.42	− 0.18	0.46	0.30	0.21	0.31	0.19	− 0.38	0.12	0.04	0.88	0.19	0.45
Short-axis distal
CW
Max	− 0.32	0.18	0.09	0.72	0.25	0.31	− 0.24	0.33	0.21	0.38	0.31	0.20	− 0.33	0.18	0.09	0.72	0.25	0.32
Min	− 0.38	0.11	0.06	0.81	0.22	0.36	− 0.39	0.10	0.22	0.37	0.39	0.10	− 0.35	0.16	0.42	0.08	0.50	0.03
Integral	− 0.26	0.28	0.13	0.61	0.23	0.35	− 0.18	0.45	0.24	0.31	0.29	0.23	− 0.26	0.30	0.15	0.55	0.24	0.34
CCW
Max	− 0.32	0.18	− 0.05	0.84	0.11	0.65	− 0.30	0.22	− 0.01	0.95	0.13	0.60	− 0.30	0.23	0.01	0.98	0.15	0.56
Min	− 0.60	0.01	− 0.08	0.75	0.21	0.39	− 0.65	0.002	0.02	0.95	0.33	0.17	− 0.63	0.005	0.17	0.51	0.43	0.08
Integral	− 0.28	0.24	0.01	0.97	0.14	0.57	− 0.23	0.35	0.10	0.67	0.19	0.44	− 0.28	0.26	0.03	0.91	0.15	0.54
Longitudinal
CW
Max	− 0.80	0.001	0.43	0.13	0.62	0.02	− 0.77	0.001	0.45	0.11	0.65	0.01	− 0.80	0.001	0.50	0.09	0.66	0.01
Min	− 0.69	0.006	− 0.06	0.83	0.21	0.47	− 0.80	0.001	0.04	0.89	0.36	0.21	− 0.79	0.001	0.24	0.44	0.46	0.11
Integral	− 0.85	0.0001	0.57	0.03	0.73	0.00	− 0.81	0.001	0.57	0.03	0.75	0.002	− 0.85	0.0002	0.62	0.03	0.76	0.003

P-value (P) from Spearman signed rank test. Boldface indicates statistical significance (p < 0.05). Italic typeface indicates statistical significance by univariate analysis (p < 0.05 in Table 4).

MPA main pulmonary artery, RV right ventricular, EF ejection fraction, EDVi end-diastolic volume indexed for body surface area, ESVi end-systolic volume indexed for body surface area, CW clockwise, CCW counter clockwise.