Pneumonitis, Extravasation, and Local Therapy Emergencies

Pneumonitis, Extravasation, and Local Therapy Emergencies

Not every emergency is systemic. Some begin in the lungs, a vein, a radiation field, or a procedure site. The RN's job is to catch the pattern early and keep small injuries from becoming respiratory failure, tissue necrosis, hemorrhage, or permanent functional loss.

Pneumonitis

Pneumonitis is inflammation of lung tissue caused by immune checkpoint inhibitors, targeted therapies (e.g., EGFR inhibitors, mTOR inhibitors), antibody-drug conjugates, bleomycin, radiation, or infection. Symptoms include new or worsening cough, dyspnea, chest tightness, fever, fatigue, hypoxia, and reduced activity tolerance, and it mimics pneumonia, PE, heart failure, and disease progression.

A crucial OCN point: checkpoint-inhibitor pneumonitis is treated by holding the drug and giving high-dose corticosteroids, not antibiotics alone, and it can be fatal. Nursing actions: vitals, continuous pulse oximetry, lung auscultation, activity tolerance, infection screening, oxygen as indicated, and prompt provider notification. Reinforce that patients must not self-start leftover antibiotics or steroids.

Extravasation

Extravasation is leakage of a drug into surrounding tissue. Vesicants cause blistering, necrosis, and tendon or nerve injury; irritants cause pain or inflammation without necrosis. Early signs: burning, stinging, pain, swelling, erythema, blanching, coolness, loss of blood return, resistance to flushing, or a slowed infusion.

When extravasation is suspected, stop the infusion immediately but leave the catheter in place initially - you may need to aspirate residual drug or instill antidote through it. Disconnect tubing, aspirate if directed, notify the provider, mark and measure the area, photograph per policy, and elevate the limb. The compress and antidote are agent-specific, a classic OCN test point:

Mnemonic: anthracyclines like it cold, vinca alkaloids like it warm. Never apply heat or cold randomly - the wrong choice can worsen injury. Document the drug, concentration, estimated volume, site, symptoms, interventions, response, education, and follow-up plan.

Radiation and Procedure Emergencies

Radiation emergencies include airway edema after head-and-neck treatment, severe esophagitis with dehydration, radiation pneumonitis, moist skin desquamation with infection, hemorrhagic cystitis, and radiation enteritis. Surgical and interventional complications include hemorrhage, wound dehiscence, perforation, bile leak, urinary obstruction, pneumothorax after thoracentesis or biopsy, and embolization complications. Monitor for pain out of proportion to the procedure, fever, drainage, swelling, crepitus, dyspnea, hypotension, tachycardia, and new neurologic deficits.

Education and Follow-Up After Local Injury

Local therapy emergencies need active follow-up because damage evolves after the patient leaves the chair, scanner, or operating room. For pneumonitis, ask whether the patient can speak in full sentences, climb their usual stairs, sleep flat, and maintain their baseline oxygen saturation. For extravasation, give site-specific instructions and schedule follow-up calls, warning the patient that tissue injury can worsen over days with increasing pain, blistering, numbness, reduced movement, or spreading redness. For procedure sites, compare pain and drainage against discharge instructions and assess anticoagulant use.

Teach patients to call for new shortness of breath, persistent cough, fever, chest pain, a painful or blistering infusion site, spreading redness, wound opening, uncontrolled pain, or bleeding, and use teach-back with a clear contact number before discharge.

Grading and Why Mechanism-Aware Care Matters

For both pneumonitis and extravasation, severity grading drives the response. Pneumonitis is commonly graded by symptoms and oxygen needs: grade 1 is asymptomatic radiographic change, grade 2 brings symptoms limiting daily activities, and grade 3 to 4 brings severe symptoms or hypoxia requiring hospitalization, oxygen, and high-dose corticosteroids with the offending drug held. Distinguishing immune pneumonitis from infection and embolism matters because treating the wrong cause - antibiotics alone for an immune process, or steroids alone for a bacterial pneumonia - lets the patient deteriorate.

For extravasation, the harm depends entirely on whether the agent is a vesicant or an irritant and on which specific vesicant it is, which is why the warm-versus-cold and antidote choices are agent-specific rather than generic. Applying cold to a vinca alkaloid or warm to an anthracycline can deepen the injury, so the nurse confirms the drug and consults the protocol before applying anything.

A worked example: a patient on continuous vincristine through a peripheral line develops swelling and loss of blood return - the nurse stops the infusion, leaves the catheter for aspiration, applies a warm compress, anticipates hyaluronidase, elevates the limb, photographs and measures the site, and arranges follow-up because tissue damage can evolve for days. Precise, mechanism-aware nursing is what separates a recoverable infiltration from a disabling tissue loss.

Prevention is part of the standard: confirm a brisk blood return and a patent vein before infusing any vesicant, prefer a central line for high-risk continuous vesicants such as continuous anthracyclines or vinca alkaloids, never use a peripheral line that has had multiple recent attempts in the same vein, and stay with the patient during the initial vesicant push so a problem is caught in seconds rather than minutes. Teach patients to report any burning, stinging, or new pain at the site immediately rather than assuming it is normal, because their early report is often the first sign of leakage.