Which of the following is a common complication of using a femoral arterial line?

Infection is indeed a common complication associated with the use of a femoral arterial line. When inserting any kind of central or peripheral line, there is a risk of introducing pathogens into the body, leading to localized or systemic infections. The femoral artery is a deep vascular structure, and improper insertion techniques or inadequate sterile procedures can increase the risk of infection at the site of access or even deeper infections such as bacteremia. Vigilant monitoring and adhering to strict aseptic techniques are essential in minimizing this risk during and after the placement of a femoral arterial line.

Other complications such as pneumothorax, while a potential risk, are more commonly associated with central venous catheter placements in the thoracic area rather than in the femoral region. Venous thrombosis generally pertains to venous access rather than arterial lines. Allergic reactions can happen due to medications or materials used in the procedure but are not as specific to the complications arising from a femoral arterial line itself.