Surface measurement, intracardiac electrocardiogram and tracheal bifurcation techniques for locating the catheter tips of totally implantable venous access port

Application of intracavitary ECG for positioning the totally implantable venous access port in the upper arm of cancer patients

Accurate positioning of the catheter tip is one of the most critical procedures in central venous catheter insertion. The traditional surface measurement method frequently has a large deviation and increases the X-ray exposure of doctors and patients. In the present retrospective study, cancer patients who received a totally implantable venous access port (TIVAP) in the upper arm using intracavitary electrocardiogram (ECG) guidance were compared with those where the traditional surface measurement method was used in terms of the rate of correct placement of the catheter tip, the rate of achieving the best position, the operation time and the complications. The results indicated that the correct placement rate and the best position rate of the catheter tip at the first attempt were higher in the ECG-guided group than in the traditional surface measurement method group (95.65 vs. 82.91% and 90.58 vs. 68.38%, respectively). The mean operation time was shorter in the ECG-guided group than in the surface measurement group (46.28 vs. 63.26 min). The incidence of complications in the ECG-guided group was 6.52%, while that in the surface measurement group was 10.26%. This indicated that the intracavitary ECG-guided tip positioning technique may improve the accuracy of tip catheter placement and shorten the operation time, thus reducing ionizing radiation caused by repeated positioning. Therefore, the intracavitary ECG-guided tip positioning technique is able to effectively place the tip of the TIVAD in the upper arm, holding great promise as a clinical application.

Efficacy, safety, and cost-effectiveness of intracavitary electrocardiography-guided catheter tip placement for totally implantable venous access port

OBJECTIVE

Intracavitary electrocardiography (IC-ECG) has been extensively used for locating the catheter tip of the central venous access devices (CVADs) with favorable safety and accuracy. We aimed to evaluate the efficacy, safety, and cost-effectiveness of IC-ECG-guided catheter tip placement for totally implantable venous access port (TIVAP) by comparing with the standard fluoroscopy method.

METHODS

231 patients who underwent TIVAP implantation from September 2019 to April 2021 were enrolled in the retrospective study. Fluoroscopy and IC-ECG were conducted intraoperatively to confirm the position of catheter tips. Demographic characteristics, surgical data, the catheter tip position, complication rate, and incidence, cost of procedures, and indwelling time were compared between the two groups. Univariate and multivariate analyses were used to identify the risk factors of TIVAP-related complications.

RESULTS

There was no significance between the fluoroscopy group and the IC-ECG group in terms of the rate of ideal position (p = 0.733). Nine patients (3.9%) developed TIVAP-related complications. Complication rates and incidence were similar in the fluoroscopy group and the IC-ECG group (3.1% and 0.114/1000 catheter days vs 4.4% and 0.105/1000 catheter days). The Kaplan-Meier curve showed that there was no significant difference in indwelling time between the two groups (Log Rank p = 0.634). Binary logistic regression analysis showed that body mass index (BMI) was an independent risk factor for TIVAP-related complications (OR = 1.334, 95%CI: 1.139 - 1.563, p < 0.001). The IC-ECG group was less costly than the fluoroscopy group (¥9928 ± 362 vs ¥11762 ± 431, p <0.001).

CONCLUSIONS

IC-ECG-guided catheter tip placement for TIVAP is feasible, safe, and cost-effective, with high accuracy, low risk of complications, and lower cost. It may be considered as an alternative to the standard fluoroscopy method for catheter tip placement of TIVAP.

Catheter allotopia with totally implantable access port: A report of three cases and literature review

Early detection and treatment are critical for preventing catheter allotopia in the totally implantable access ports and whenever possible, the right internal jugular vein should be selected as the first puncture point.

Modified surface measurement method to determine catheter tip position of totally implantable venous access port through right subclavian vein

BACKGROUND

Optimal catheter tip position of a totally implantable venous access port (TIVAP) is important to maintain its function and to avoid severe complications. In this study, we aimed to assess the reliability of a modified surface measurement method to determine optimal tip position of a TIVAP catheter inserted through the right subclavian vein.

METHODS

Clinical and radiologic information of 105 patients who underwent TIVAP implantation through the right subclavian vein was collected retrospectively. The length of the implanted catheter was determined by a modified surface measurement method, as follows. The distance from the puncture point (point A) to the middle point of the sternal notch (point B), then from the middle point of the sternal notch (point B) to the middle point of Louis angle (point C) was added up. The equation for the catheter length is given by catheter length (cm) = AB + BC + 3. Postprocedure plain chest radiography (CXR) and enhanced chest computed tomography (CT) were used to check the catheter tip position and to calculate optimal position rate. Distance from the carina to the catheter tip and the length of the vertebral body unit were measured on both CXR and CT. Distances from carina to caval-atrial junction (CAJ) and from catheter tip to CAJ were measured on CT.

RESULTS

Mean length of the implanted catheter of all patients was 17.0 ± 0.7 cm (male vs female, 17.3 ± 0.5 cm vs 16.7 ± 0.7 cm; P < .001). On CXR, a catheter tip located within 2.4 vertebral body units below the carina was identified as the optimal position, and the optimal position rate was 97.1% (102/105 cases). On CT, two definitions of optimal position were used: within 2 cm above or below the CAJ and within 2 cm above or at the CAJ; the optimal position rate was 92.4% (97/105 cases) and 78.1% (82/105 cases), respectively. Median follow-up time was 9.4 months. During the follow-up, no severe cardiac complication was recorded.

CONCLUSIONS

The modified surface measurement had high reliability in determining the optimal catheter length to accurately place the tip in the superior vena cava near the CAJ.