Which device is used to apply torque to the guide catheter to aid steering during PCI?

• A. Torque device
• B. Guide catheter
• C. Inflation device
• D. Hemostatic valve

Answer: (A)

Applying torque to the guide catheter to aid steering during PCI is done with a torque device. This accessory attaches to the proximal end of the guide catheter and lets the operator rotate the catheter tip by turning a handle or dial. The torque is transmitted along the catheter shaft, allowing precise orientation of the tip toward the coronary ostium, which is especially important in tortuous or challenging anatomy. The guide catheter itself is simply the conduit for wires and devices; the inflation device is used to inflate balloons, and the hemostatic valve helps control bleeding at the access site. The torque device is specifically designed to provide controlled rotational force for steering.