intraosseous access
Pronunciation: in-tra-OSS-ee-us
Also written as: IO
Emergency vascular access obtained by inserting a needle directly into bone marrow, used when peripheral or central venous access is difficult or impossible to establish.
Full Definition
Intraosseous (IO) access is a critical emergency procedure that provides rapid vascular access through insertion of a specialized needle into the bone marrow cavity. Common insertion sites include the proximal tibia, distal tibia, proximal humerus, and sternum in adults. IO access is particularly valuable in emergency surgery settings when patients are in shock, severely dehydrated, or have difficult venous access due to obesity or previous IV drug use. The bone marrow cavity functions as a non-collapsible vein, allowing administration of fluids, medications, blood products, and contrast agents at rates similar to central venous access. Modern IO devices use power drills or spring-loaded mechanisms to facilitate rapid insertion. Contraindications include fracture at the insertion site, infection, or previous orthopedic hardware. Complications are rare but include osteomyelitis, compartment syndrome, or needle breakage.
Usage
Usage note: Use 'IO' as abbreviation in clinical notes; spell out 'intraosseous' in formal documentation. Avoid 'intraosseous line' as it's access, not a line.
In Context
- "Unable to establish peripheral IV access in the hypotensive patient, the nurse obtained intraosseous access in the proximal tibia." — Emergency department nursing note
- "Intraosseous access allowed immediate administration of blood products during the trauma resuscitation." — Trauma surgery documentation