Venous Catheters and IV Complications - Study Notes
Peripheral Venous Catheter vs Central Venous Catheter
A peripheral venous catheter is inserted into a small peripheral vein in the arm or hand. The short peripheral catheter, which is the most common IV you will encounter, is length . A midline peripheral catheter is longer, between and , and its tip terminates at or below the level of the axilla and distal from the shoulder. In contrast, a central venous catheter (CBC) has its tip terminating in the superior vena cava (SVC), just above the right atrium. CBCs are indicated when patients require long-term IV therapy, such as antibiotics, total parenteral nutrition (TPN), or chemotherapy. The vein in which a CBC catheter terminates is larger and more robust, able to withstand harsher medications like vancomycin or chemotherapy agents. Examples of CBCs include tunneled and non-tunneled central venous catheters, peripherally inserted central catheters (PICC lines), and implantable ports.
Indications and types of central venous access
CBCs are favored for long-term or vesicant therapies and when reliable, high-volume access is needed. Peripheral veins in the arm are delicate and more susceptible to damage from irritating medications, whereas central veins provide a sturdier conduit for certain drugs. Types of CBCs include:
Tunneled central venous catheters
Non-tunneled central venous catheters
PICC lines
Implantable ports
Location and function of CBC tips
The key anatomical point is that the catheter tip for a CBC resides in the superior vena cava and is positioned just above the heart in the right atrium area. This placement allows infusions of hyperosmolar or irritant medications (e.g., vancomycin) with reduced risk of local tissue injury compared to smaller peripheral veins.
Practical implications
When deciding on catheter type, clinicians weigh:
Expected duration of therapy
Type of infused medications (pH/osmolality, vesicants)
Patient venous anatomy and risk of complications
Common IV complications (and how to respond)
Below are the major IV catheter–related complications, their signs, and initial management steps as described in the transcript.
Phlebitis
Definition and origin: Phlebitis means inflammation of a vein. The term comes from phleb-, meaning vein. Causes include mechanical irritation from the catheter rubbing within the vein and chemical irritation due to the medication’s pH or osmolality.
Signs/symptoms: Erythema (redness), warmth, pain, induration (hardened vein), and possibly a red streak along the vein.
Initial management: Discontinue the IV, elevate the extremity, and apply warm, moist compresses.
Infiltration
Definition: Infiltration occurs when IV fluids or medications leak into surrounding tissue outside the vein.
Signs/symptoms: Swelling of the limb, cool-to-touch skin, dampness at the IV site, and a slowed IV infusion rate; you may notice leakage from the IV site.
Clinical note: A personal anecdote mentioned in the transcript described a pregnancy hospitalization where one arm became significantly larger due to infiltration.
Initial management: Remove the IV and initiate a new IV site elsewhere; elevate the extremity and monitor for tissue injury.
Note: The transcript includes a mnemonic, “driving test routes,” linking infiltration to practice for a driving test as a memory aid.
Extravasation
Definition: A specific type of infiltration where the infiltrated agent is a vesicant—a medication capable of causing tissue necrosis.
Signs/symptoms: Erythema, pain, edema, formation of blisters; necrotic tissue such as slough and possible ulceration.
Nursing management: Stop the infusion, aspirate any residual medication from the IV line, and administer an antidote per facility policy. After antidote administration, discontinue the IV, elevate the extremity, and apply a warm or cold compress depending on the solution involved.
Catheter embolus
Definition: A fragment of the IV catheter breaks off and travels within the venous system.
Prevention/inspection: After discontinuing an IV, always inspect the catheter tip for completeness; a missing fragment suggests catheter embolus.
Signs/symptoms: Pain along the vein (potentially severe), a weak, thready pulse, and hypotension.
Initial management: Place a tourniquet high on the affected extremity and prepare the patient for surgical removal of the catheter fragment.
Air embolus
Definition: Air enters the venous system via the IV catheter.
Signs/symptoms: Hypotension, tachycardia, tachypnea, and cyanosis.
Immediate management: Clamp the catheter, place the patient in the Trendelenburg position (head lower than the feet), administer supplemental oxygen, and notify the provider.
Thrombosis (blood clot) associated with IV lines
Cause/overview: Thrombus formation can occur despite routine flushing of peripheral IVs and CBCs.
Context: When a PICC line is in use, there may be standing orders for thrombolytic therapy (e.g., alteplase) to restore patency if a clot forms.
Clinical sign: Difficulty aspirating blood or obtaining a blood return when attempting a blood draw or medication administration.
Management: Administer the thrombolytic agent (as ordered), allow it to dwell for about 30 minutes, then reassess patency.
Fluid overload
Definition: Excessive volume being infused into the circulation.
Signs/symptoms: Shortness of breath, crackles on auscultation, hypertension, jugular venous distension (JVD), peripheral edema, and tachycardia.
Initial management: Raise the head of the bed to improve breathing, slow the infusion rate, monitor oxygen saturation and vital signs, and administer diuretics if ordered.
Practical considerations and care reminders
Always verify catheter integrity after removal or advancement; a missing fragment constitutes an embolus risk.
For CBCs, be mindful of medications that are more caustic or osmotically challenging to peripheral veins; CBC tips in the SVC help tolerate these meds.
Use appropriate interventions immediately when signs of a complication appear; rapid response can minimize tissue damage and systemic effects.
When a complication is suspected, document the signs, rate of onset, and actions taken, and notify the medical team as required by protocol.
Quick reference checklist (condensed)
Peripheral catheter length: ext{short}< = 3''; Midline:
CBC tip location:
Indications for CBC: long-term IV antibiotics, TPN, chemotherapy, etc.
Complications to recognize quickly: phlebitis, infiltration, extravasation, catheter embolus, air embolus, thrombosis, fluid overload.
Initial responses: stop/coninue appropriate steps, elevate, position patient, apply compresses, administer antidotes or thrombolytics as ordered, monitor vitals and oxygen, notify provider.