How does an antihistamine work?

By blocking the effects of histamine in the body

By reducing inflammation in the body

By increasing the production of histamine in the body

By stimulating the immune system

Answer and Explanation

The Correct Answer is A

A) By blocking the effects of histamine in the body:
Antihistamines are pharmacological agents that work by antagonizing the effects of histamine, a chemical mediator released by mast cells and basophils in response to allergens or other triggers. Histamine contributes to various allergic symptoms such as itching, sneezing, nasal congestion, and watery eyes. Antihistamines exert their effects by competitively binding to histamine receptors (specifically H1 receptors) on target cells, thereby preventing histamine from binding and exerting its physiological effects. By blocking histamine receptors, antihistamines inhibit the action of histamine, leading to the alleviation of allergy symptoms.

B) By reducing inflammation in the body:
While some medications, such as corticosteroids, exert anti-inflammatory effects by suppressing the immune response and inhibiting the production of inflammatory mediators, antihistamines primarily target histamine receptors and do not directly reduce inflammation. Although histamine release can contribute to inflammation, antihistamines mitigate allergic symptoms primarily by blocking the action of histamine rather than by directly reducing inflammation.

C) By increasing the production of histamine in the body:
This statement is inaccurate. Antihistamines do not increase the production of histamine; instead, they counteract the effects of histamine by blocking its activity at receptor sites. The primary mechanism of action of antihistamines involves blocking histamine receptors to prevent histamine from exerting its physiological effects.

D) By stimulating the immune system:
Antihistamines do not stimulate the immune system. Instead, they act as antagonists to histamine receptors, thereby inhibiting histamine-induced responses. While histamine is involved in immune responses and allergic reactions, antihistamines do not directly modulate immune function or stimulate immune activity. Their primary role is to alleviate allergy symptoms by blocking the effects of histamine."

Nursing Test Bank

Quiz #1: RN Exams Pharmacology Exams Quiz #2: RN Exams Medical-Surgical Exams Quiz #3: RN Exams Fundamentals Exams Quiz #4: RN Exams Maternal-Newborn Exams Quiz #5: RN Exams Anatomy and Physiology Exams Quiz #6: RN Exams Obstetrics and Pediatrics Exams Quiz #7: RN Exams Fluid and Electrolytes Exams Quiz #8: RN Exams Community Health Exams Quiz #9: RN Exams Promoting Health across the lifespan Exams Quiz #10: RN Exams Multidimensional care Exams

Get 100+ Naxlex Exit Exams for $79 Try Naxlex NCLEX-RN (14 Day Free-Trial)

Naxlex Comprehensive Predictor Exams

Quiz #1: Naxlex RN Comprehensive online practice 2019 B with NGN Quiz #2: Naxlex RN Comprehensive Predictor 2023 Quiz #3: Naxlex RN Comprehensive Predictor 2023 Exit Exam A Quiz #4: Naxlex HESI Exit LPN Exam Quiz #5: Naxlex PN Comprehensive Predictor PN 2020 Quiz #6: Naxlex VATI PN Comprehensive Predictor 2020 Quiz #8: Naxlex PN Comprehensive Predictor 2023 - Exam 1 Quiz #10: Naxlex HESI PN Exit exam Quiz #11: Naxlex HESI PN EXIT Exam 2

Free Nursing Study Resources

Correct Answer is ["43.1"]

Explanation

Here's how we can find the dose:

Convert client weight to kilograms (kg):

We know 1 kg = 2.205 pounds.

Client weight (kg) = 95 lbs / 2.205 lb/kg = 43.1 kg (round to one decimal place for accuracy in calculation).

Calculate the enoxaparin dosage per dose:

Prescribed dosage: 1 mg/kg/dose

Client weight (kg): 43.1 kg (rounded value from step 1)

Enoxaparin dose per dose (mg) = Dosage (mg/kg/dose) x Client weight (kg)

Enoxaparin dose per dose (mg) = 1 mg/kg/dose * 43.1 kg = 43.1 mg (round to nearest tenth as requested)

Therefore, the nurse should administer approximately 43.1 mg of enoxaparin per dose.

A. Decreased bowel sounds B. Dehydration C. Rigid abdomen D. Hypothermia

Correct Answer is B

Explanation

A) Decreased bowel sounds:
While diarrhea can lead to changes in bowel function, such as increased frequency and urgency, it typically does not cause decreased bowel sounds. In fact, hyperactive bowel sounds may be present in some cases of diarrhea due to increased gastrointestinal motility and peristalsis as the body attempts to expel excess stool.

B) Dehydration:
This is the correct answer. Diarrhea can result in fluid and electrolyte losses, leading to dehydration if not adequately managed. Common symptoms of dehydration include increased thirst, dry mucous membranes, decreased urine output, dark urine, fatigue, weakness, and dizziness. In severe cases, dehydration can lead to hypovolemic shock, a life-threatening condition requiring immediate medical attention.

C) Rigid abdomen:
While abdominal discomfort and cramping are common symptoms of diarrhea, a rigid abdomen is not typically associated with uncomplicated cases of diarrhea. However, severe abdominal pain, distention, and rigidity may indicate underlying complications such as bowel obstruction or peritonitis, which require urgent medical evaluation.

D) Hypothermia:
Hypothermia, or abnormally low body temperature, is not a typical finding in clients with diarrhea. In fact, diarrhea is more commonly associated with fluid and electrolyte imbalances that can lead to hyperthermia (elevated body temperature) due to dehydration and inflammatory responses. However, hypothermia may occur in severe cases of dehydration or sepsis, but it is not a direct consequence of diarrhea itself.

View Question and Answer

Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.

Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today

How does an antihistamine work?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

Correct Answer is ["43.1"]

Explanation

A nurse is assessing a client who has had diarrhea for several days. Which of the following findings should the nurse expect?

Correct Answer is B

Explanation

A nurse is preparing to administer vancomycin 15 mg/kg/day divided equally every 12 hr. The client weighs 198 lb. How many mg should the nurse administer with each dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

A nurse is teaching a client who has a new prescription for captopril. Which of the following instructions should the nurse include in the teaching?

The client has been ordered a nonselective beta-blocking agent called propranolol, PO. Propranolol is used in the treatment of which disorders (Select All that Apply.)

What role do the kidneys have in the pharmacokinetics process?

A nurse is caring for a client who is postoperative following a transurethral resection of the prostate (TURP). The nurse should plan to administer the client’s PRN bethanechol when the client reports which of the following manifestations?

ACE inhibitors work on the RAAS to prevent the conversion of angiotensin I to angiotensin II. Because this blocking occurs in the cells in the lung, which is usually the site of this conversion, the use of ACE inhibitors often results in

The nurse explains the action of laxatives as doing what?