We have read with great interest the manuscript of An et al. [1], whose article focused on the safety of inserting a totally implantable central venous access device (TICVAD) by using a blind percutaneous approach. Although it is a method that has been used for many years and has been proven to be useful by many physicians familiar with this approach [2], risks remain.

We offer some comments about the present article. In the section "Procedure for the TICVAD insertion," the authors wrote that the venous catheter was filled with about 10 mL of diluted heparin (50 IU/mL). Usually, the amount of saline mixed with heparin that can be placed in the catheter of a TICVAD cannot be more than 2 mL. Also, the proportion of the mixed solution of saline and heparin was 9:1, meaning that for each 9 mL of saline, 1 mL of heparin (5,000 IU) was added. Thus, each milliliter contained 500 IU of heparin [3]-not 50 IU, as written by the authors. In the same paragraph, the authors wrote that they checked the tip of the catheter after completing the procedure. The position of the catheter should be checked during the procedure to avoid having to perform a second procedure, particularly in cancer patients who are already in an especially delicate state.

In the RESULTS section, An et al. [1] differentiated the complications as early and late. This type of differentiation is not sufficiently precise. Generally, complications that appear within the first 24 hours are defined as immediate, between 24 hours and 30 days after the procedure as early, and after 30 days as late [4]. This classification is very important because the majority of the complications that occur during the first 24 hours are strictly related to the operator or to technical failures. Using this classification, late complications (e.g., pinch-off [5]) are fundamental and usually present after several months. In the same section, the authors wrote about a complication they called "port migration." Usually we hear of "catheter migration." Perhaps the authors described port dislodgement as port migration [4]. This complication concerns a port that has been inserted into a subcutaneous space and is not well fixed to the fascia, causing it to become dislodged.

In the DISCUSSION section, the authors focused on the differences in the incidence of pneumothorax in relation to the practitioner (surgeon or radiologist) who performed blind cannulation of the subclavian vein. In 2015, it is inconceivable that cannulation of a central vessel is performed in a blind manner. The fact that these authors did not experience any cases of pneumothorax or hemothorax is not a valid justification to continue to perform this technique without using an ultrasonography (US)-guided approach, which is currently recommended worldwide. Also, in the DISCUSSION section, the authors described the internal jugular vein as the safest access point for positioning a TIVAD catheter. We believe that the safest access remains the cephalic vein using the cutdown technique [6]. This technique is absolutely free of risk and immediate complications and does not require US support. Also, unless a skin incision is needed to position the port [7], surgeons should attempt the cutdown technique.