Abstract: Objective:To investigate the feasibility of establishing a digital model of juxtahepatic vena cava.
Methods:The clinical data of 120 participants (without liver diseases) who were admitted to the Cangzhou Central Hospital from January 2013 to May 2013 were collected. The results of computed tomography were analyzed. The diameters of juxtahepatic vena cava on different levels (P1 plane: inferior vena cava at the entrance to the right atrium, P2 plane: the upper margin of the roots of hepatic veins, P4 plane: lower boundary of liver, P5 plane: confluence of renal veins and inferior vena cava), and the circumference of the inferior vena cava and the lengths between these levels were recorded. A digital model of juxtahepatic vena cava was established by these data on the premise that the juxtahepatic vena cava was engorged. All data were analyzed using the analysis of variance, paired sample t test and independent samples t test, and correlation and regression were used in analysis of relations between there data.
Results:Data of the P1 plane and P2 plane were both missed in 3 cases, and 〖HJ*4〗the data of the P4 plane was missed in 8 cases. The theoretical diameter of hepatic vena cava at the P1, P2 and P4 planes were (28.1±4.0)mm, (28.7±3.5)mm and (23.5±2.7)mm, respectively. The median diameter of hepatic vena cava at the P5 plane was 24.3 mm. The juxtahepatic vena cava was a 3 dimensional structure of cylinder with a slightly protruding middle part. There were significant differences in P1D P2D, P2D P4D, P1D P4D (F=77.5, P<0.05). There were significant differences between P2D P4D and P1D P4D (t=14.893, 11.210, P<0.05). The median length of hepatic vena cava between P1 and P2 planes was 7.5 mm. The lengths of hepatic vena cava between P1 and P4 planes, P2 and P4 planes were (85.2±11.0)mm and (78.2±9.8)mm, respectively. The median length of hepatic vena cava between the P4 and P5 planes was 10.0 mm. P1D P2D, P2D P4D, P2D P5D and P4D P5D were positively correlated (r=0.862, 0.308, 0.186, 0.788, P<0.05), while P1D P4D and P2D P5D did not correlated (r=0.180, 0.118, P>0.05). P2D was correlated with the body weight, and P5D was correlated with the age (r=0.200, 0.130, P<0.05). The P1D, P2D, P4D and P5D of the inferior vena cava were (28.5±3.7)mm, (29.0±3.4)mm, (23.9±2.8)mm and (24.3±2.6)mm in males, and (27.8±4.2)mm, (28.5±3.6)mm, (23.1±2.5)mm and 24.0 mm in females. There were no significant difference in P1D, P2D, P4D and P5D between males and females (t=0.911, 0.809, 1.588, 1.902, P>0.05). The length between P1 and P2 planes was negatively correlated with P1D and P2D (r=〖KG-*4〗-0.245, -0.160, P<0.05), while the length between P4 and P5 planes was positively correlated with P1D (r=0.149, P<0.05). The length between P2 and P4 planes was positively correlated with P2D (r=0.195, P<0.05). The length between P1 and P2 planes did not correlated with the age, height and body weight (r=〖KG-*4〗-0.092,-0.047,-0.033, P>0.05). The lengths between P2 and P4 planes, P1 and P4 planes were negatively correlated with the age (r=〖KG-*4〗-0.343,-0.371, P<0.05), but positively correlated with the body weight (r=0.271, 0.208, P<0.05). The length between P4 and P5 planes was positively correlated with the height and body weight (r= 0.154, 0.255, P< 0.05) . There were no significant difference in the lengths between P1 and P2 planes, P1 and P4 planes, P2 and P4 planes, P4 and P5 planes between males and females (t=〖KG-*4〗-1.046,-1.274,-0.908, 1.375, P>0.05). The length between P2 and P4 planes was similar to the length of retrohepatic vena cava. The length between P2 and P4 planes(mm)=71.23〖KG-*2〗-〖KG-*5〗0.293×age (years)+0.32×body weight (kilogram).
Conclusion: The establishment of digital model of juxtahepatic vena cava based on the computed tomography imaging data is feasible, which provides basis for clinical investigation.