Do not place IO in extremity that?

Do not place IO in extremity that?

• A. Has a fracture.
• B. Edema.
• C. Has a tourniquet on it.
• D. Recent IV insertion

Answer: (C)

Intraosseous access is intended to deliver fluids and medications into the systemic circulation quickly. If a tourniquet is on the limb, blood flow is blocked, so anything infused through an IO in that limb would stay localized and not reach the central circulation promptly. That makes placing IO there ineffective and potentially unsafe, which is why the extremity with a tourniquet is avoided. The other options are situations you’d manage differently, but they’re not the same clear limitation: a fracture at the insertion site is a contraindication to placing IO in that specific bone, so you’d choose a different site; edema or a recent IV insertion in the limb doesn’t inherently prevent IO placement in general, though they may affect the choice of site or technique.

Intraosseous access is intended to deliver fluids and medications into the systemic circulation quickly. If a tourniquet is on the limb, blood flow is blocked, so anything infused through an IO in that limb would stay localized and not reach the central circulation promptly. That makes placing IO there ineffective and potentially unsafe, which is why the extremity with a tourniquet is avoided.

The other options are situations you’d manage differently, but they’re not the same clear limitation: a fracture at the insertion site is a contraindication to placing IO in that specific bone, so you’d choose a different site; edema or a recent IV insertion in the limb doesn’t inherently prevent IO placement in general, though they may affect the choice of site or technique.