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Difficulty: MediumPharmacological Therapies

An outpatient clinic practical nurse (PN) is reviewing the health records of several clients scheduled to receive the live-attenuated measles, mumps, and rubella (MMR) vaccine. Which client findings require the PN to withhold the immunization and immediately consult the registered nurse (RN)? Select all that apply.

  1. A 24-year-old client who states, "I just found out I am 8 weeks pregnant."Answer
  2. A 45-year-old client currently undergoing immunosuppressive chemotherapy for lymphoma.Answer
  3. A 6-year-old client with a documented severe anaphylactic reaction to a previous dose of the MMR vaccine.Answer
  4. D
    A 15-month-old toddler with a mild upper respiratory cough and a temperature of 99.4°F (37.4°C).
  5. E
    A 12-year-old client whose most recent white blood cell (WBC) count is 8,500/mm³.
  6. F
    A 10-year-old client with a pre-vaccination resting heart rate of 88 beats/minute.

Answer

The findings that require withholding the live-attenuated MMR vaccine are the client who is 8 weeks pregnant, the client undergoing immunosuppressive chemotherapy, and the client with a documented anaphylactic reaction to a previous dose.
Live-attenuated vaccines, such as the MMR vaccine, contain a weakened form of the living virus. They are strictly contraindicated in pregnant clients due to the risk of fetal transmission and teratogenic effects. They are also contraindicated in severely immunocompromised clients (such as those on chemotherapy) because their weakened immune systems cannot safely handle the virus, risking a severe infection. A documented anaphylactic reaction to a previous dose is an absolute contraindication for any medication or vaccine due to the high risk of a life-threatening allergic response upon re-exposure.

Step-by-Step Solution

1
Analyze the medication class.
The MMR vaccine is identified as a live-attenuated virus vaccine.
Different types of vaccines (live vs. inactivated) have distinct safety parameters and contraindications.
2
Recall absolute contraindications for live-attenuated vaccines.
Identified pregnancy, severe immunocompromise (e.g., active chemotherapy), and previous anaphylactic reactions as critical safety risks.
Live vaccines contain a weakened form of the virus that can cause harm in vulnerable or hypersensitive populations.
3
Evaluate the remaining scenarios to differentiate true contraindications from false contraindications.
Determined that mild acute illnesses, normal laboratory values, and normal pediatric vital signs are safe conditions for administration.
Recognizing false contraindications prevents unnecessary delays in vital immunizations.
4
Select the client scenarios that present true contraindications.
Selected the pregnant client, the chemotherapy client, and the client with a prior anaphylactic reaction as requiring immediate RN consultation.
The PN must practice within scope by identifying unsafe medication parameters and withholding administration until evaluated by the RN.

Key Concept

Live-attenuated vaccine contraindications and safe administration parameters.
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Topics

Pharmacological Therapies

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