7.1 Peripherally Inserted Central Catheters (PICC)

PICCs on the CRNI blueprint

Domain 2A.2.b (central devices) expects you to classify a peripherally inserted central catheter (PICC) correctly, place and confirm its central tip, match it to duration and therapy chemistry, and prevent or recognize infection, thrombosis, and malposition. Chapter 6 covered peripheral devices whose tips stay peripheral. A PICC looks similar at the arm insertion site to many midlines—but tip location defines the class.

Quick Answer: A PICC is inserted in an upper-arm peripheral vein (often basilic, then brachial/cephalic as alternatives) and advanced so the catheter tip resides in the lower superior vena cava (SVC) near the cavoatrial junction. It is a CVAD. Typical dwell is weeks to months based on indication. Confirm tip with ECG-based methods/tip location systems (TLS) and/or radiograph per protocol. Prefer maximal sterile barriers at insertion. Monitor for CLABSI and thrombosis (arm circumference, edema, pain). Flush with saline; heparin only if policy/device requires. A tip at the mid-clavicle is not acceptable central placement.

Definition and central classification

Exam rule: Length + arm insertion ≠ automatic “peripheral.” If the tip is central, the device is a CVAD and CLABSI prevention logic applies.

Vein selection and insertion principles

Preferred veins

Ultrasound-guided selection is standard in modern PICC programs:

Catheter-to-vein ratio matters: oversized catheters in small veins increase thrombosis risk. Choose the smallest lumen number and French size that still meet therapy (e.g., do not place a triple-lumen PICC “just in case” when a single lumen would suffice).

Insertion environment and barriers

PICC insertion is a sterile procedure with maximal sterile barrier precautions (cap, mask, sterile gown, sterile gloves, large sterile drape covering the patient) and skin antisepsis with appropriate agent and full dry time. Ultrasound probe covers and sterile gel maintain the field. Modified Seldinger technique is common: needle → wire → dilator/sheath → catheter advancement.

Measurement: External measurement estimates length to the target central position; final acceptance depends on tip confirmation, not measurement alone.

Tip location: the make-or-break detail

Target position

Ideal adult PICC tip: lower third of the SVC near the cavoatrial junction (exact imaging landmarks per protocol and local radiology standards). This location provides high blood flow for hemodilution of irritating or hyperosmolar solutions and reduces some malposition-related arrhythmia risks associated with deep atrial tips—while avoiding “too high” positions that behave more like peripheral tips for therapy risk.

Confirmation methods

Do not use for central therapy until tip is confirmed per organizational protocol. “Blood return and flushes easily” does not prove central tip location.

Malposition recognition (high-yield)

Suspect malposition when:

• Tip on imaging is in IJ, contralateral subclavian, azygos, internal mammary, or mid-clavicular/axillary regions rather than lower SVC
• Patient develops ear/neck pain, whooshing sound, persistent arrhythmia after advancement, or inability to aspirate/flush from one lumen with unexplained resistance patterns
• Infusions cause unexpected local pain or swelling along the chest/neck pathway
• Power injection or high-rate infusions fail or cause severe symptoms

Exam trap: Accepting a tip that stops at the mid-clavicle as “good enough for TPN/vesicants.” Incorrect. Mid-clavicular position is not the lower SVC/cavoatrial target and is treated as malposition for central-therapy purposes until corrected or reclassified.

Actions: stop use for high-risk central therapies until repositioned/exchanged per protocol; notify provider/vascular access team; never force against resistance.

Power-injectable PICCs and multi-lumen design

Many modern PICCs are labeled power-injectable for CT contrast at specified PSI and flow rates. Rules:

• Use only if the specific device and each lumen are labeled for power injection
• Verify patency and correct connections before injection
• Follow maximum rate/PSI in the IFU; do not assume every pink or purple hub is power-capable without checking labels

Multi-lumen PICCs allow concurrent incompatible infusions but add hub entries and infection surface area—justify each lumen.

Dwell, indications, and selection context

Typical indication patterns:

• IV antibiotics for weeks (e.g., osteomyelitis, endocarditis pathways)
• Parenteral nutrition requiring central administration
• Vesicant or highly irritating therapies needing central hemodilution
• Patients needing reliable multi-week access when peripheral options fail or are inappropriate

Not automatic: Day-of-admission PICC for every patient “to save sticks.” Use vessel health and therapy algorithms (duration, osmolarity/pH, vesicant status, care setting).

Outpatient/home infusion is a major PICC strength when the patient/caregiver can maintain dressing and hub care with support.

Maintenance essentials

Flush and lock

• Primary flush: preservative-free 0.9% sodium chloride, often with push-pause (pulsatile) technique to clear the lumen
• Heparin lock: only when policy, device IFU, or lumen type requires it—many saline-only protocols exist for valved or certain open-ended systems; do not invent heparin for every PICC
• Use syringe size guidance per manufacturer (commonly avoid excessive pressure with very small syringes on occluded lines)
• Never force against occlusion—troubleshoot position, clamps, precipitate, thrombosis algorithms

Blood draws

PICCs can be used for blood sampling when ordered and appropriate, following discard/push-pull or waste volumes per policy, pausing incompatible infusions, and flushing thoroughly afterward. For cultures when line infection is not the question, peripheral venipuncture is often preferred to avoid contamination and false-positive line cultures (see Domain 1C concepts).

Dressing, securement, and assessment

• Transparent dressing when possible; change on schedule and when damp/loose/soiled
• Engineered securement reduces pistoning
• Assess site and arm every shift and with every use
• Measure upper-arm circumference at a consistent landmark (often at insertion or per protocol) at baseline and trend for thrombosis surveillance—unilateral increase, pain, or edema is a red flag

Complications table

Scenario

A patient needs 6 weeks of IV antibiotics and intermittent PN components that require central administration. Ultrasound shows a suitable basilic vein. Plan: single- or double-lumen PICC as needed (not unnecessary triple), maximal barriers, ECG/TLS ± radiograph confirmation of lower SVC/cavoatrial tip, saline flush protocol, baseline arm circumference, home infusion teaching. Reject mid-clavicular tip reports as “ready for PN.”

High-yield exam traps

• Treating mid-clavicular tip as OK for central therapy
• Calling a PICC a midline (or vice versa) based only on arm insertion
• Accessing without tip confirmation
• Routine triple-lumen placement without multi-infusion need
• Ignoring arm circumference changes as early thrombosis clues
• Assuming heparin is mandatory for every PICC regardless of policy/device
• Using a non–power-labeled lumen for power contrast injection