Page 381 - Fluid, Electrolyte, and Acid-Base Disorders in Small Animal Practice

Technical Aspects of Fluid Therapy 371

A

B C

D E
Figure 15-7 The EZ-IO system. A, The drill body and a needle/stylet assembly. B, Disassembled needle
and stylet. The stylet screws onto the needle hub, and the shaft of the drill body firmly engages the hub of the
stylet. C, The catheter is firmly seated within the bone marrow of the proximal humerus and the stylet
is unscrewed and removed. D, A test aspiration collects a bone marrow sample to confirm proper placement.
E, An intravenous fluid line is connected to the catheter.

2. Create a stab incision through the skin with the blade; through the cortex as soon as you gain purchase into
introduce the needle into the wound; and advance it it, and drill it into the marrow.
to the periosteum. Seat the needle into the cortex by 4. The position of the needle may be tested by flicking it
pushing the needle lightly into the bone while rotating with a finger. If the needle is firmly seated in bone, it
itaboutitslongaxisbackandforthover30-degreeturns. will not wobble when struck. When the limb is moved,
3. When the needle is seated in the cortex, apply increas- the needle should move solidly with the bone.
ing pressure to it as you rotate back and forth to force 5. Attach the 12-mL syringe, and apply vacuum. If the
it through the cortex. A sudden reduction in resistance needle tip is within the bone marrow, some marrow
is often felt as the cortex is breached. If using a elements should enter the syringe. If an injection nee-
threaded commercial intraosseous needle, screw it dle without a stylet was used, the needle may be