Intravenous fluid therapy involves the direct infusion of liquid substances into a patient's vein. This route provides the fastest way to deliver medications, blood products, and fluid replacements throughout the body. Nurses use IV therapy primarily to restore and maintain fluid and electrolyte balance, correct acid-base disturbances, and supply nutritional support when oral intake is impossible or inadequate. Because the infused substances bypass the digestive system and enter the bloodstream immediately, rapid therapeutic effects occur alongside an equally rapid risk of severe complications if errors happen.
IV fluids are divided into distinct categories based on how they affect the concentration of body fluids. Understanding these tonicities prevents dangerous fluid shifts between cells and blood vessels.
Gathering proper equipment before starting an intravenous procedure ensures safety and efficiency. Standard supplies include the IV cannula or catheter of an appropriate gauge, a tourniquet, antiseptic skin prep such as chlorhexidine or alcohol, transparent dressings, tape, gloves, and a disposal sharps container.
The infusion setup requires the prescribed IV fluid bag, an administration set, and sometimes an electronic infusion pump. Administration sets come as primary gravity sets, which can be macro-drip or micro-drip depending on the required drop factor. Macro-drip sets deliver larger drops (typically 10, 15, or 20 drops per milliliter), suitable for routine adult fluid replacement, while micro-drip sets deliver 60 drops per milliliter and are used for precise volume control in pediatrics or critical care.
Before initiating intravenous therapy, the nurse must verify the medical order against the patient's identity using two distinct identifiers. Assessing the patient's baseline vital signs, current hydration status, and known allergies—especially to latex, tape, or disinfectants—prevents adverse reactions.
Inspect the patient's arms to select an appropriate venipuncture site. Choose distal veins on the upper extremities first, saving proximal sites for future access if needed. Avoid arms with compromised circulation, previous mastectomy, dialysis fistulas, or active localized infections. Explaining the procedure to the patient helps reduce anxiety and secures their cooperation during cannulation.
Nurses must calculate infusion rates accurately to ensure patients receive the correct volume of medication without fluid overload. For gravity infusions, the flow rate depends on the total volume, the total time in minutes, and the drop factor of the administration set.
Calculate drops per minute using the standard formula: $$\text{Flow Rate (gtt/min)} = \frac{\text{Volume (mL)} \times \text{Drop Factor (gtt/mL)}}{\text{Time (minutes)}}$$
When using an infusion pump, the calculation is simpler because the machine delivers fluid in milliliters per hour (mL/hr). Regular checks of the roller clamp or pump settings ensure the infusion stays on schedule throughout the shift.
Continuous surveillance of the IV site protects the patient from local and systemic complications. Nurses should inspect the insertion site every shift for signs of redness, swelling, warmth, tenderness, or leaking. The dressing must remain clean, dry, and securely intact; replace it immediately if it becomes damp or loose.
Flush intermittent saline locks regularly with normal saline to maintain patency and prevent blood clotting inside the catheter lumen. Change peripheral IV sites and dressings according to hospital policy, typically every 72 to 96 hours, or sooner if clinical complications develop.
Intravenous therapy carries risks of local and systemic adverse events that require immediate nursing action.
Discontinuing an intravenous line occurs when therapy is complete, complications arise, or the patient transitions to oral medications. Begin by washing hands, wearing gloves, and stopping the infusion. Gently peel away the dressing and tape toward the insertion site while stabilizing the catheter.
Place a sterile gauze pad over the site and withdraw the catheter smoothly, keeping it parallel to the skin to avoid trauma. Apply direct pressure with the gauze for at least one to two minutes until bleeding stops, then secure with a dry bandage. Inspect the removed catheter tip to ensure it is intact, and document the procedure, site appearance, and patient tolerance.