A nurse is caring for a client who has contact dermatitis after exposure to poison ivy. The nurse recognizes that this condition is mediated by what type of cells?

B cells

T cells

Mast cells

Answer and Explanation

The Correct Answer is B

Choice A reason:

B cells are not involved in contact dermatitis, as they do not produce antibodies or form immune complexes.

Choice B reason:

T cells are the type of cells that mediate contact dermatitis, which is a type of type IV hypersensitivity. T cells recognize the poison ivy antigens that bind to the skin proteins and release cytokines that recruit macrophages and other inflammatory cells. This leads to a delayed and localized reaction that manifests as erythema, edema, vesicles, and pruritus.

Choice C reason:

T cells are not the same as B cells, as they have different receptors and functions in the immune system.

Choice D reason:

Mast cells are not involved in contact dermatitis, as they do not express IgE antibodies or release histamine.

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Correct Answer is B

Explanation

Choice A reason:

This is an incorrect answer because an induration of 5 mm or more is considered a positive reaction only for certain high-risk groups, such as people who are HIV-positive, have recent contact with a person with active tuberculosis, or have chest radiograph findings consistent with prior tuberculosis.

Choice B reason:

This is a correct answer because an induration of 10 mm or more is considered a positive reaction for most people, including those who are recent immigrants from high-prevalence countries, injection drug users, residents or employees of high-risk settings, children younger than 4 years old, or people with certain medical conditions that increase the risk of tuberculosis.

Choice C reason:

This is an incorrect answer because an induration of 15 mm or more is considered a positive reaction only for people who have no known risk factors for tuberculosis.

Choice D reason:

This is an incorrect answer because an induration of 20 mm or more is not a criterion for a positive reaction, as it exceeds the maximum threshold for any group.

A. 1 B. 4 C. 6 D. 8 E. Provide supplemental oxygen as needed

Correct Answer is A

Explanation

The SOFA score is a tool that assesses the degree of organ dysfunction or failure in septic shock. It is based on six parameters: blood pressure, Glasgow coma scale, PaO2/FiO2 ratio, platelet count, bilirubin level, and creatinine level. Each parameter is assigned a score from 0 to 4 based on the severity of the abnormality. The total SOFA score ranges from 0 to 24, with higher scores indicating worse organ dysfunction or failure.

The client's blood pressure of 80/50 mmHg corresponds to a SOFA score of 1, as it indicates hypotension.

The client's Glasgow coma scale is not given, so it is assumed to be normal (15), which corresponds to a SOFA score of 0.

The client's PaO2/FiO2 ratio is not given, so it is assumed to be normal (>400), which corresponds to a SOFA score of 0.

The client's platelet count is not given, so it is assumed to be normal (>150 x 10^9/L), which corresponds to a SOFA score of 0.

The client's bilirubin level is not given, so it is assumed to be normal (<20 micromol/L), which corresponds to a SOFA score of 0.

The client's creatinine level is not given, so it is assumed to be normal (<110 micromol/L), which corresponds to a SOFA score of 0.

The total SOFA score is the sum of the scores for each parameter: 1 + 0 + 0 + 0 + 0 + 0 = 1. Therefore, the client has a SOFA score of 1.

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A nurse is caring for a client who has contact dermatitis after exposure to poison ivy. The nurse recognizes that this condition is mediated by what type of cells?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

Correct Answer is B

Explanation

Correct Answer is A

Explanation

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