What is the first step in the Seldinger Technique?

• A. Placement of needle in the lumen
• B. Insertion of needle
• C. Threading of catheter
• D. Insertion of guidewire

Answer: (B)

The first step in the Seldinger Technique is the insertion of a needle. This technique is widely used in interventional radiology and involves gaining access to a vessel in order to facilitate further procedures such as catheter placement. The standard approach begins with puncturing the skin and entering the lumen of the target vessel using a needle, which ensures a direct pathway for subsequent steps.

After the needle is successfully inserted, a guidewire can be advanced through the needle into the vessel, enabling the safe placement of a catheter or other devices later in the process. The initial step of needle insertion is crucial, as it sets the stage for the accurate and sterile advancement of instruments into the vascular system, impacting the overall success of the procedure.