4.2 Complications, Documentation, and Professional Practice

Complication questions are priority questions

The VA-BC blueprint gives Troubleshooting Complications and Interventions 16%, the second-largest domain. Legal and ethical considerations add 8%, and professional development and evidence-based practice add another 8%. In practice, these domains overlap. A question about extravasation is also a documentation question. A question about an occluded catheter is also a medication safety and scope question. A question about a patient refusing a PICC is clinical, ethical, and legal at the same time.

Site and vein complications

Phlebitis is vein inflammation. The study materials emphasize the INS phlebitis scale: Grade 1 may include erythema with or without pain; Grade 2 adds pain with erythema and/or edema; Grade 3 includes pain, erythema, streak formation, and a palpable venous cord; Grade 4 includes severe findings such as purulence or a longer cord. For exam reasoning, Grade 3 is not a watch-and-wait finding. It requires catheter removal, evaluation, and documentation per policy.

Infiltration is leakage of a nonvesicant into tissue. Extravasation is leakage of a vesicant and has higher tissue-injury risk. The priority is not to complete the dose or dilute through the same site. Stop the infusion. For suspected vesicant extravasation, practice scenarios emphasize attempting to aspirate residual drug through the existing catheter before removal, then following the medication-specific protocol, notifying the provider, treating the site as directed, and documenting objective findings.

Occlusion management

Occlusion questions test classification. A mechanical occlusion comes from a closed clamp, kink, tight securement, malposition, needle dislodgement, catheter tip against the vessel wall, or patient position. The first move is correction and reassessment, not alteplase.

A thrombotic occlusion involves clot and may require alteplase per protocol after mechanical causes are excluded. A fibrin tail can create a ball-valve effect: the catheter may flush but not aspirate blood. Lipid residue may follow lipid-containing infusions such as parenteral nutrition, and drug precipitate occlusion depends on the pH and compatibility problem. Those nonthrombotic causes require pharmacy-directed, precipitate-specific management.

Do not force a catheter. Force can rupture a catheter, dislodge material, worsen infiltration or extravasation, or mask a mechanical problem. A safe answer checks the obvious mechanical causes, reviews recent infusates, verifies orders and policy, then selects the intervention that matches the suspected occlusion type.

Air embolism, pinch-off, and device integrity

Air embolism prevention is central during insertion, access, and removal. During central line removal, source materials emphasize Trendelenburg positioning with a Valsalva maneuver at removal to reduce air entry. Warning signs such as sudden dyspnea, chest pain, hypotension, neurologic change, or a mill-wheel murmur are not routine anxiety or catheter discomfort. The emergency response cue is emergency positioning, oxygen, and rapid escalation.

Pinch-off syndrome is classically associated with infraclavicular subclavian catheters compressed between the clavicle and first rib. Positional occlusion may be the clue. The danger is progression to catheter fracture and embolization, so repeated positional occlusion deserves investigation rather than repeated forceful flushing.

Documentation, refusal, scope, and EBP

Professional practice questions often look less dramatic but carry real risk. Documentation should be objective, timely, and complete: device type, site, vein when relevant, catheter length and external length, dressing and securement status, tip confirmation when applicable, patency, blood return, patient response, education, complications, notifications, and interventions. Do not chart assumptions as facts. Do not omit a refusal, a changed external length, a missing blood return before vesicant use, or a complication response.

A competent adult may refuse vascular access. The professional response is to explain the indication, risks, benefits, and alternatives; assess understanding; notify the provider; and document the informed refusal and education. A provider order does not erase patient autonomy. Certification also does not expand scope. Scope is defined by licensure, state rules, facility policy, demonstrated competency, and orders.

Medication safety is part of vascular access practice. Before infusion, verify patient identity with two identifiers and check the right medication, dose, route, rate, and patient. Evidence-based practice means integrating current evidence, clinician expertise, and patient preferences. Quality improvement tests local process changes, such as a CLABSI root cause analysis that looks for supply, training, hub-scrub, dressing, or documentation failures. The exam favors system improvement through appropriate channels, not unilateral workarounds.