Hypersensitivity, Anaphylaxis, and Infusion Reactions
Key Takeaways
- Infusion reactions range from mild flushing or itching to anaphylaxis with airway compromise, hypotension, shock, or death.
- The first nursing action for a concerning reaction is usually to stop the infusion, keep IV access, assess ABCs, and call for help according to policy.
- Anaphylaxis requires immediate escalation and emergency medications under standing orders or provider direction, with epinephrine as the key life-saving therapy when indicated.
- Monitoring includes vital signs, respiratory status, skin findings, mental status, symptom timing, response to medications, and risk for recurrence.
- Patient education should distinguish expected side effects from urgent symptoms such as throat tightness, wheezing, chest pain, dizziness, or swelling.
Hypersensitivity, Anaphylaxis, and Infusion Reactions
Oncology patients receive many agents that can cause hypersensitivity or infusion reactions, including monoclonal antibodies, taxanes, platinum drugs, asparaginase, immunotherapy, blood products, antibiotics, iron, and supportive medications. Reactions may be immune mediated, cytokine mediated, complement mediated, or related to excipients. The bedside response is similar at first: recognize, stop the exposure when appropriate, assess severity, call for help, support airway and circulation, and administer ordered rescue medications.
Early Recognition
A reaction can begin with itching, flushing, hives, rash, nasal congestion, sneezing, chills, back pain, abdominal cramping, nausea, anxiety, or a sense of impending doom. Severe reactions can cause throat tightness, tongue or lip swelling, wheezing, stridor, chest tightness, hypoxia, hypotension, syncope, confusion, cyanosis, or cardiovascular collapse. Symptoms during the first minutes of a first infusion are high risk, but reactions can also occur after prior uneventful doses.
| Severity clue | Nursing interpretation |
|---|---|
| Localized itching or mild flushing | Requires assessment and protocol-based action |
| Generalized hives or rigors | Higher concern; stop and notify per policy |
| Wheezing, stridor, throat tightness | Airway emergency until proven otherwise |
| Hypotension, syncope, confusion | Possible shock and rapid response need |
| Recurrent symptoms after treatment | Possible biphasic reaction or incomplete control |
Immediate Nursing Actions
For a concerning infusion reaction, stop the infusion. Maintain IV access with compatible fluid according to policy, assess airway, breathing, circulation, vital signs, oxygen saturation, lung sounds, skin, mental status, and pain. Call the provider, infusion reaction team, or rapid response team based on severity. Position the patient safely, apply oxygen as indicated, prepare emergency equipment, and stay with the patient.
Administer medications only under standing orders, protocol, or provider direction. These may include epinephrine for anaphylaxis, antihistamines, corticosteroids, bronchodilators, IV fluids, antipyretics, or vasopressor support in advanced settings. Epinephrine should not be delayed when anaphylaxis criteria are met. The RN should know where emergency medications and airway equipment are located before starting high-risk infusions.
Rechallenge and Documentation
Do not restart an infusion after a significant reaction unless the provider and protocol direct it. Rechallenge decisions consider severity, symptom resolution, drug necessity, premedication, infusion rate, and alternative therapy. The RN documents the drug, dose, route, lot information if required, premedications, start time, symptom onset, assessment findings, vital signs, interventions, patient response, notifications, transfer, and education. Clear documentation protects future care because the next team needs to know whether the event was mild flushing, severe bronchospasm, or true anaphylaxis.
Patient Education
Teach patients to report symptoms immediately during infusion rather than waiting to see if they pass. Many patients do not want to interrupt treatment, so be explicit: itching, chest tightness, throat symptoms, dizziness, shortness of breath, severe back pain, or swelling must be reported at once. After discharge, instruct patients to seek urgent care for delayed swelling, trouble breathing, recurrent hives, fainting, fever with rigors, or worsening chest symptoms.
Monitoring and Prevention
Before administration, verify allergies, prior reactions, premedications, baseline vital signs, risk factors, and emergency readiness. Monitor more closely during initial exposures, step-up dosing, rate increases, and rechallenges. For blood products, follow transfusion reaction policy and stop the transfusion for suspected serious reaction. The nurse's calm, rapid, protocol-based response is central: remove the trigger, assess the patient, escalate, treat as ordered, reassess, and communicate.
Differentiating Reaction Types
Some infusion reactions are cytokine driven and include fever, chills, rigors, hypotension, and hypoxia without classic hives or swelling. Others are allergic or anaphylactic and may involve airway edema, wheezing, urticaria, gastrointestinal cramping, and shock. The nurse does not need to name the mechanism before acting; severity and patient stability drive the response. Baseline assessment helps because anxiety, chronic dyspnea, pain, or flushing may already be present before infusion.
During handoff, include the exact sequence: premedications, infusion rate, time symptoms began, whether the drug was stopped, vital sign nadir, respiratory findings, medications administered, and whether symptoms fully resolved. This detail guides future desensitization, rechallenge, or avoidance decisions.
A patient develops throat tightness, wheezing, and hypotension during an infusion. What is the priority nursing response?
Which teaching point is most important before starting a high-risk infusion?
After a severe infusion reaction resolves, which action is safest?