外周静脉插管

Peripheral IV catheters enable rapid delivery of critical medications including antibiotics for infections and sepsis, fluids for dehydration, and medications for cardiac problems and arrhythmias. They also allow blood samples to be obtained for laboratory testing. IV access is one of the safest and easiest ways to administer these essential treatments in emergency settings.

A majority of peripheral IV lines are placed in superficially located veins of the upper extremities, extending from the upper arm to the hand. The antecubital fossa contains the largest vessels and is an ideal starting location. IV catheters can also be placed in lower extremity veins, though caution is advised in patients with diabetes or poor peripheral circulation.

Catheter selection depends on the patient's needs and clinical situation. Sizes range from 14 to 24 gauge. Use 14 to 16 gauge catheters when patients require large fluid volumes or blood transfusions. Have multiple catheter sizes available since patient vein size is difficult to predict. Smaller gauges work for routine medication administration.

Place the tourniquet on the upper portion of the arm and tie it tightly by crossing the ends over each other and tucking in one end rather than making a knot. This method ensures easy removal after vein access is achieved. The tourniquet should be snug enough to distend veins but not so tight that it compromises circulation.

Start palpating in the antecubital fossa where vessels are largest, then work distally down the arm. Feel for a 'squishy' or 'springy' area indicating a vein, which is more important than visualization. Inspect the skin for blue or gray-colored veins. If no vessel is found proximally, reapply the tourniquet on the forearm to access hand veins.

After the catheter is fully advanced, remove the tourniquet and place gauze under the catheter hub to prevent bleeding. Apply gentle pressure on the proximal catheter portion while carefully removing the needle, then immediately place it in the sharps container. Attach tubing to the hub, draw blood back to confirm placement, flush with saline, and check for swelling or patient pain.

Secure the IV line to the patient's skin using clear dressing and tape to prevent dislodgement from patient movement. Additional tape or an arm board may be necessary for diaphoretic or pediatric patients. Proper securement is essential for maintaining line integrity and preventing complications during treatment administration.