Comprehensive Guide to Peripheral and Central IV Management of IV Therapy

Peripheral Intravenous Site Selection and Insertion Technique

• Site Selection Strategy: Prefer distal veins first, moving proximal with subsequent attempts. Begin at the hand or lower forearm and work upward.

  • Clinical Rationale: If a vein is damaged or infiltrates distally, a more proximal site can still be utilized. Starting proximally and moving distally wastes usable vein space above a compromised site.
  • Affected Extremities to Avoid:
    • The arm on the side of a mastectomy with lymph node dissection due to lymphedema risk.
    • Arms with an Arteriovenous (AV) fistula or graft due to risk of damaging the fistula.
    • Paralyzed or weak extremities due to reduced sensation and circulation, which significantly heightens complication risks.
  • Areas of Flexion: Avoid the antecubital fossa and wrist when better options exist. Movement at joints increases mechanical irritation, dislodgement, and infiltration risk.

• Catheter Gauge Selection: Choose the smallest gauge that safely accomplishes the prescribed task. Smaller diameters are represented by larger gauge numbers.

  • $22-24\,\text{g}$: Used for routine fluids, medications, and patients with very fragile or small veins.
  • $18-20\,\text{g}$: Required for blood products, contrast dye (CT scans), or rapid infusions.
  • $14-16\,\text{g}$: Reserved for trauma and large volume resuscitation.
  • Clinical Rationale for Small Gauges: A smaller catheter causes less trauma to the vein wall and increases patient comfort, thereby reducing phlebitis risk. However, the catheter must be large enough to prevent the hemolysis of blood cells ($18-20\,\text{g}$ or larger required for blood).

• Aseptic Insertion Technique:

  • Clean the site using chlorhexidine (or per facility policy).
  • Allow the site to dry completely before puncture. Piercing wet antiseptic drives the solution and residual surface organisms into the vessel rather than allowing the antiseptic to kill bacteria on the skin surface.
  • Never reinsert the needle into an advanced catheter.

Securement, Dressing Care, and Site Assessment

• Dressing Types:

  • Transparent Semipermeable Dressing: Used over the insertion site to allow for visual inspection for redness or swelling without removal, while providing a bacterial barrier.
  • Gauze Dressing: Used if the site is bleeding or diaphoretic. Since it is not transparent, it must be changed more frequently (commonly every $24-48\,\text{hours}$).

• Dressing Maintenance:

  • Change transparent dressings every $5-7\,\text{days}$ or immediately if they become loose, soiled, or wet. A compromised dressing allows outside organisms to enter along the catheter track.

• Labeling Requirements: The dressing must be labeled with the date and time of insertion, the catheter gauge, and the inserter’s initials. This ensures subsequent shifts know when the site is due for removal without reviewing the chart.

• Assessment Frequency: Assess the site at least every shift ($4-8\,\text{hours}$) or more frequently for vesicant or high-risk infusions.

  • Observation Criteria: Redness, swelling, warmth, pain/tenderness, drainage, and streaking along the vein.
  • Palpation: Palpate above the site to detect subtle firmness or coolness, which can indicate early infiltration before visible swelling occurs.
  • Blood Return: A brisk flash of blood on aspiration confirms the catheter tip is intravascular. Absence of blood return is an early indicator of infiltration or occlusion.

• Site Rotation and Duration:

  • Clinically indicated changes are generally preferred over routine time-based rotations for peripheral IVs.
  • Always rotate or discontinue a site immediately with any sign of infiltration, phlebitis, or infection. A healthy line poses low risk, whereas a compromised line is dangerous regardless of its age.

Phlebitis Grading and Maintenance Protocols

• Phlebitis Severity Grading:

  • Mild: Redness and tenderness at the site.
  • Moderate: Redness with a palpable cord along the vein.
  • Severe: A palpable cord over $1\,\text{inch}$ long accompanied by fever.
  • Intervention: Discontinue the IV at the first sign of phlebitis. Continuing to infuse through an inflamed vein increases pain, the risk of thrombophlebitis (clot formation), and infection.

• Flushing Technique:

  • Flush with $0.9\%\,\text{NS}$ (Normal Saline) before and after medication administration and every $12\,\text{hours}$ for intermittent (saline lock) lines when not in use.
  • Push-Pause Technique: Use a "stop-start" pulsed motion to create turbulence. This is more effective than a steady push at clearing debris or fibrin from the catheter lumen.
  • Resistance Warning: Never force a flush against resistance. Forcing fluid into an occluded line can dislodge a clot into systemic circulation or rupture the vein.

• Positive Pressure Technique: Clamp the extension tubing while still injecting the final portion of the flush, or use a positive-displacement cap. This prevents natural backflow from pulling blood into the catheter tip, where it could clot.

IV Tubing and Solution Replacement Schedules

• Standard Primary Continuous Tubing: Change per policy, commonly every $96\,\text{hours}$ up to $7\,\text{days}$ for clear, non-lipid, non-blood infusions.
• IV Solution Bags: Change at least every $24\,\text{hours}$, regardless of the remaining volume. Hanging bags are open systems exposed to room air, and bacterial growth risks increase over time.
• High-Risk Fluid Tubing:
  • Blood/Blood Products: Change every unit or within $4\,\text{hours}$.
  • Lipids/Total Parenteral Nutrition (TPN): Change every $24\,\text{hours}$.
  • Clinical Rationale: Blood and lipid emulsions are rich growth media. The protein and fat content that nourish the patient also flourish organisms, mandating frequent tubing changes to prevent bloodstream infections.

Advanced Vascular Access: Midlines and Central Lines

• Midlines:

  • A peripheral line between $8-12\,\text{cm}$ in length.
  • The tip resides in a peripheral vein just below the axilla.
  • Inserted by a PICC (Peripherally Inserted Central Catheter) nurse, often using ultrasound to confirm patency.
  • Used for patients with difficult venous access.

• Central Venous Catheters (CVC):

  • Access involving a catheter ending in the Superior Vena Cava (SVC).
  • Required for certain medications that cause extravasation if administered peripherally.
  • Dressing Care: Must be changed using sterile technique every $7\,\text{days}$ or when soiled. A CHG (chlorhexidine) patch is used to reduce infection risk.
  • CLABSI Prevention: Central Line-Associated Bloodstream Infections are a major risk; lines should be removed as soon as clinically possible.

• CVC Types:

  • PICC: Central line inserted through a peripheral vein (basilic, brachial, cephalic, or medial cubital). Used for long-term therapy. High risk for clots and infection.
  • Non-Tunneled Central Catheter: Placed directly into a large central vein (groin, neck, or subclavian) for short-term emergent use.
  • Cordis: A short, large-bore catheter for rapid volumes of blood or fluids (trauma, unstable GI bleeds). Short-term use only.
  • Port-A-Cath: Implantable port under the skin connected to a central vein. Used for long-term therapy (chemo) with a lower infection risk.

Intravenous Fluid Classifications

• Isotonic Solutions:

  • Concentration: Similar water-to-solute ratio as blood.
  • Effect: Expands Intracellular Fluid (ICF) and Extracellular Fluid (ECF) equally; cells stay the same shape.
  • Examples: $0.9\%\,\text{Normal Saline (NS)}$, $Lactated\,Ringer's\,(LR)$, $5\%\,Dextrose\,in\,Water\,(D_5W)$ (starts isotonic, becomes hypotonic when metabolized).
  • Uses: Blood loss, shock, dehydration, fluid maintenance. $NS$ is the only fluid used when administering blood products.

• Hypotonic Solutions:

  • Concentration: Lower solute concentration than blood.
  • Effect: Water enters cells, causing them to swell. Draws fluid into the cells.
  • Examples: $0.45\%\,Saline\,(1/2\,NS)$, $0.33\%\,Saline\,(1/3\,NS)$, $0.225\%\,Saline\,(1/4\,NS)$.
  • Uses: Cellular dehydration, DKA, HHNS, hypernatremia.
  • Contraindications: Never give to patients at risk for increased ICP, liver disease, trauma, or burns.

• Hypertonic Solutions:

  • Concentration: Higher solute concentration than blood.
  • Effect: Water leaves the cells, causing them to shrink. Expands the intravascular volume.
  • Examples: $3\%\,Saline$, $5\%\,Saline$, $D_5NS$, $D_5LR$, $10\%\,Dextrose\,(D_{10}W)$.
  • Uses: Hyponatremia, cerebral edema, hypovolemia.
  • Nursing Considerations: High concentrations (like $D_{10}$) require a central line; monitor closely for hypervolemia.

IV Complications and Nursing Actions

• Infiltration (Non-Vesicant):

  • S/S: Swelling, coolness, pallor, sluggish/absent blood return, mild discomfort.
  • Action: Stop infusion, remove catheter, elevate extremity, apply warm or cool compress, restart in a new site.

• Extravasation (Vesicant):

  • S/S: Pain, burning, blanching, blistering, tissue necrosis (e.g., from vasopressors, chemo, calcium chloride).
  • Action: Stop infusion immediately, disconnect tubing. Leave catheter in place for initial aspiration of residual drug or antidote administration. Do not flush. Notify provider.

• Air Embolism:

  • S/S: Sudden dyspnea, chest pain, hypotension, tachycardia, "mill-wheel" murmur, sense of impending doom.
  • Action: Clamp tubing, place patient on their LEFT side in Trendelenburg position. This traps air in the right atrium/ventricle away from the pulmonary outflow. Give $O_2$ and call for help.

• Circulatory Overload:

  • S/S: $BP$, bounding pulse, JVD, crackles, dyspnea, edema.
  • Action: Slow/stop infusion, raise head of bed (HOB), notify provider. Risk is highest in older adults, infants, and those with cardiac/renal disease.

• Catheter-Related Bloodstream Infection:

  • Local: Redness, warmth, purulent drainage.
  • Systemic: Fever, chills, elevated WBC, hypotension.
  • Action: Discontinue line, culture catheter tip per policy, notify provider.

Flow-Rate Formulas

• Flow Rate (mL/hr):     $\text{mL/hr} = \frac{\text{total mL}}{\text{hours}}$

• Drip Rate (gtt/min):     $\text{gtt/min} = \frac{\text{mL} \times \text{drop factor}}{\text{minutes}}$

  • Note: Always round drops to the nearest whole number and use the specific tubing's drop factor.

Discontinuing an IV Line

1. Have gauze and tape ready.
2. Turn off and clamp the infusion.
3. Remove the dressing while the catheter is still in the vein.
4. Withdraw the catheter parallel to the skin in one smooth motion.
5. Apply pressure with dry sterile gauze immediately after removal for $30\,\text{seconds}$ to $2\,\text{minutes}$ (longer for patients on anticoagulants). Applying pressure during removal can shear the vein wall.
6. Inspect Tip: Confirm the catheter tip is intact. If a piece is missing, notify the HCP immediately to address potential embolism.
7. Document removal time, site appearance, and catheter integrity.