Intravenous Therapy & Complications

Introduction to Intravenous Therapy

Intravenous (IV) therapy is a foundational clinical intervention used to administer fluids, electrolytes, medications, blood products, and nutritional support directly into the systemic circulation. Because IV administration allows immediate drug bioavailability, it carries a high risk of local and systemic complications. Registered nurses are responsible for selecting appropriate sites, maintaining catheter patency, performing aseptic site care, and continuously monitoring for adverse reactions.

Peripheral IV Site Management and Maintenance

Maintaining peripheral IV lines requires adherence to evidence-based nursing protocols to prevent infection and mechanical failure:

• Site Selection: Start distally on the upper extremities (e.g., hand veins) and move proximally with subsequent insertions. Avoid veins in the lower extremities of adults due to the high risk of thrombophlebitis and embolism. Avoid the antecubital fossa for routine lines as joint flexion leads to mechanical irritation and occlusion. Never use an arm with an active arteriovenous (AV) fistula, a history of lymph node dissection or mastectomy, or signs of infection/lymphedema.
• Aseptic Technique: Cleanse the skin with chlorhexidine gluconate (or 70% alcohol if contraindicated) using friction for at least 30 seconds, and allow it to air-dry completely before inserting the catheter.
• Dressing Maintenance: Secure the catheter with a sterile, transparent semipermeable dressing. Replace the dressing immediately if it becomes damp, loose, or visibly soiled.
• Flushing Protocols: Flush peripheral catheters with 0.9% Normal Saline before and after medication administration, or at least once every 8 to 12 hours (saline lock) to maintain patency. Use the push-pause (turbulent flush) method to clear residual blood from the catheter lumen, and apply positive pressure when disconnecting the syringe.
• Assessment Frequency: Assess peripheral IV sites at least every 4 hours for stable adult patients, every 1 to 2 hours for critically ill or pediatric patients, and continuously or hourly during the infusion of vesicant medications.

Local IV Complications

Local complications occur at or near the insertion site and are typically related to mechanical trauma, chemical irritation, or bacterial contamination.

Infiltration

Infiltration is the unintentional leakage of a non-vesicant solution or medication into the surrounding subcutaneous tissue.

• Pathophysiology: Caused by the catheter dislodging from the vein lumen, puncturing the posterior vein wall, or increased venous pressure forcing fluid out around the insertion site.
• Clinical Signs: Coolness of the skin around the site, localized swelling (edema), pallor, dampness of the dressing, discomfort or mild pain, and a slowed or stopped IV flow rate.
• Infiltration Staging (INS Scale): Ranges from Grade 0 (no symptoms) to Grade 4 (skin tight, leaking, deep pitting edema, circulatory impairment, or moderate-to-severe pain).
• Nursing Interventions:
  1. Stop the infusion immediately and disconnect the IV tubing from the catheter.
  2. Assess the site and check if any fluid can be aspirated from the catheter.
  3. Remove the peripheral catheter carefully, checking that the catheter tip is intact.
  4. Elevate the affected extremity above the level of the heart to promote fluid reabsorption and reduce swelling.
  5. Apply a thermal compress: Apply a cold compress for hypertonic or high-pH solutions to reduce localized edema, or a warm compress for isotonic solutions to promote blood flow and fluid clearance.
  6. Restart the IV line in a different extremity, or proximal to the infiltrated site if the same arm must be used.

Extravasation

Extravasation is the leakage of a vesicant solution or medication into the surrounding tissue, leading to severe tissue damage, blistering, sloughing, and necrosis. Vesicants include chemotherapeutic agents, vasopressors (e.g., dopamine, norepinephrine), calcium gluconate, potassium chloride, and phenytoin.

• Clinical Signs: Similar to infiltration initially, but progresses to burning pain, severe erythema, blistering, and tissue ulceration within days.
• Nursing Interventions:
  1. Stop the infusion immediately. Do not remove the catheter right away.
  2. Aspirate residual drug from the catheter using a syringe to minimize tissue exposure.
  3. Check for an antidote protocol: If a specific antidote exists (e.g., phentolamine for vasopressor extravasation, hyaluronidase for vinca alkaloids), administer it through the existing catheter before removal.
  4. Remove the catheter after administering the antidote (if applicable).
  5. Notify the healthcare provider and clinical pharmacist.
  6. Apply thermal compresses as indicated by the specific drug guidelines (e.g., cold compresses for most vesicants to localize the drug, warm compresses for vasopressors to cause vasodilation and drug dispersal).
  7. Elevate the extremity and document the incident extensively.

Phlebitis

Phlebitis is the inflammation of the inner lining (intima) of the vein.

• Types of Phlebitis:
  • Chemical: Caused by irritating medications or solutions (e.g., hypertonic solutions, potassium, antibiotics).
  • Mechanical: Caused by a catheter that is too large for the vein, inadequate securing leading to catheter movement, or insertion during joint flexion.
  • Bacterial: Caused by poor aseptic technique during insertion or dressing changes, or contamination of the system.
• Clinical Signs: Erythema, warmth, localized pain, swelling, and a palpable venous cord along the path of the vein. Red streaks may be visible extending proximally from the insertion site.
• Phlebitis Staging (INS Scale): Ranges from Grade 0 (no symptoms) to Grade 4 (pain, erythema, streak formation, palpable cord > 1 inch, purulent drainage).
• Nursing Interventions:
  1. Stop the infusion and remove the catheter immediately.
  2. Apply a warm, moist compress to the area to relieve pain and promote circulation.
  3. Elevate the extremity.
  4. Document the phlebitis grade and monitor the site for signs of worsening infection or thrombosis.

Local IV Complications Comparison

Systemic IV Complications

Systemic complications affect the entire body and represent critical, potentially life-threatening medical emergencies.

Fluid Volume Overload (Circulatory Overload)

Circulatory overload occurs when fluids are infused into the vascular space more rapidly than the cardiovascular and renal systems can process.

• Risk Factors: Elderly patients, infants, and patients with underlying renal failure, heart failure, or pulmonary disease.
• Clinical Signs: Dyspnea, tachypnea, hypoxia, crackles heard on lung auscultation, distended jugular veins (JVD), bounding peripheral pulses, hypertension, and acute weight gain.
• Nursing Interventions:
  1. Stop or slow the infusion immediately to a keep-vein-open (KVO) rate (typically 10-20 mL/hr).
  2. Position the patient upright (high-Fowler's position) to maximize chest expansion and lung capacity.
  3. Administer supplemental oxygen as prescribed.
  4. Assess vital signs and lung sounds.
  5. Notify the healthcare provider immediately.
  6. Anticipate orders for loop diuretics (e.g., intravenous furosemide) and monitor strict intake and output.

Air Embolism

An air embolism occurs when air enters the venous system and travels to the right ventricle, blocking blood flow into the pulmonary artery.

• Causes: Failure to prime IV tubing, loose connections, or improper purging during central line dressing changes.
• Clinical Signs: Sudden onset of severe chest pain, dyspnea, cyanosis, tachycardia, hypotension, and a "mill-wheel" murmur heard over the precordium.
• Emergency Interventions:
  1. Clamp the IV tubing immediately to prevent further air entry.
  2. Position the patient in left lateral Trendelenburg (Durant's maneuver). This traps the air bubble in the apex of the right ventricle, preventing it from entering the pulmonary artery.
  3. Administer 100% oxygen.
  4. Notify the healthcare provider and call a rapid response team.
  5. Monitor vital signs and prepare for emergency resuscitation if cardiac arrest occurs.