The effect of body posture change on the catheter tip position of totally implantable venous access port / 介入放射学杂志

ABSTRACT

Objective To discuss the effect of body posture change on the catheter tip position of totally implantable venous access port (TIVAP).Methods Under ultrasound guidance,implantation of TIVAP was carried out through bedside puncturing of internal jugular vein or subclavian vein.After the implantation of TIVAP,X-ray chest films of both erect position and supine position were taken to check the catheter tip position.The distance from the upper edge of the first thoracic vertebra to the catheter tip was separately measured on the erect position and supine position chest films.The shift of the catheter tip position was judged by the difference in the distance measured on chest films as well as by the comparison with the bony anatomic marks.Results Successful implantation of TIVAP was accomplished in 86 patients.When the patients changed from erect position to supine position,the catheter tip of TIVAP moved caudally in 71 patients,with the mean displace distance being (12.29±7.48) mm;the catheter tip of TIVAP moved cephalad in 31 patients,with the mean displace distance being (5.00±3.79) mm;and the catheter tip of TIVAP remained in the same position in 2 patients.When the patients changed from erect position to supine position,the catheter tip of TIVAP had a tendency to move toward the foot side,the average displace distance was (-9.32±9.36) mm,the difference in catheter tip location between two photographic positions was statistically significant (P＜0.000 1).No statistically significant correlation existed between the changes of catheter tip position and the sex,age,height,weight as well as body mass index (P＞0.05).Conclusion After the implantation of TIVAP,the position of catheter tip will change with patient's body posture.When patient's posture changes from erect position to supine position the tip of the catheter tends to shift towards the atrium.