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NURS 233 Exam 5 Questions And Correct Answers

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NURS 233 Exam 5 Questions And Correct Answers...

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  • October 4, 2024
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  • 2024/2025
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  • NURS 233
  • NURS 233
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Braxton
NURS 233 Exam 5 Questions And Correct Answers


What is histamine involved with?

-nerve transmission in CNS

-capillary dilation

-smooth muscle contraction

-gastric acid stimulation

-increase HR

-mild allergic rxns



What are the 2 types of histamine receptors

H1 and H2

Which histamine receptor is involved with capillary dilation and smooth muscle
contraction

H1



Which histamine receptor is involved with gastric acid stimulation and increased HR

H2



Antihistamines _______ with histamine for _________ receptor sites

compete, specific



What do H2 blockers help decrease

gastric acid secretion



What are H1 blockers help with?

,-allergic rhinitis

-anaphylaxis

-angioedema

-drug fevers

-insect bites

-pruritus



what are the drugs to know with antihistamines

-diphenhydramine

-chlorpheniramine

-fexofenadine

-loratadine

-cetirizine



To get the best result when should you start taking antihistamines

as soon as symptoms start



What is the MOA of antihistamines?

Compete with histamines for binding to H1 receptors to prevent a histamine mediated
response (prevent mild allergic rxns)



Does antihistamine knock off histamine when its already bound to the receptor?

no



Contraindications for antihistamine

-asthma attack

-narrow angle glaucoma

,-coronary disease

-resp disease (COPD)

-seizure

-HTN

-Enlarged prostate




Precaution for antihistamine

elderly bc it caused paradoxical effect




paradoxical effect

opposite of the intended drug effect (for antihistamines= restlessness/stressed)




Adverse effects of antihistamines

-drowsiness/sedation

-anti cholinergic effects




What would be examples of anticholinergic effects

-dry eyes

-dry mouth

, -constipation

-urinary retention




How are some ways you can help with the drying effects (anticholinergic effect) of
antihistamines

-saline/eyedrops

-hydrate (drink water)

-sugar free hard candies/gum

-lotion/chapstick




How would you know the antihistamine worked?

-everything drys up

-no nasal congestion/runny nose

-sedation/better sleep




What are some drug interactions that you would watch for when administering
antihistamines?

-allergy testing

-ETOH

-MAOI

-other CNS depressants

-other anticholinergic drugs (OTC cold meds)

When would you withhold antihistamines if the pt. is going to receive allergy testing

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