Abstract
3-lumen, double-balloon catheter (3L-DBC) and 4-lumen, double-balloon catheter (4L-DBC) were invested for the renal venography with mongrel dogs. For obtaining parenchyma visualization of both kidneys with 3L-DBC, contrast medium was needed to be injected with the higher pressure than the blood pressure.
However, four out of thirty-five dogs manifested the rupture of the inferior vena cava and leaking the contrast medium to the retroperitoneal space. In order to prevent these accidents, three different methods were attempted:
1) Renal venography with a 3L-DBC after stopping the renal arterial blood flow by another balloon catheter placed in aorta. The renal parenchyma was observed by decreasing the pressure between two balloons under 100mmHg in this modification.
2) Renal venography with the inflation of the distal balloon of the 3L-DBC to let the pressure go to the inferior vena cava. The interlobular veins were shown with the pressure of inferior vena cava less than 100mmHg in this modification.
3) Renal venography with a 4L-DBC monitoring the pressure between two balloons through a lumen of the catheter. We could visualize up to the interlobular veins with the pressure between the balloons under 100mmHg in this modification.
All three modifications did not cause any rupture of the inferior vena cava and renal veins. Last two modifications are easy and safe in renal venography and are indicated for clinical usefullness.
