A nurse in a community health center is assessing the results of a tuberculin skin test she performed on a client. Which of the following results indicates exposure to and a possible infection with tuberculosis (TB)?
10 mm wheal
5 mm induration
15 mm induration
4 mm erythema
The Correct Answer is C
Choice A Reason:
A 10 mm wheal is not indicative of TB infection. A wheal is a raised, often itchy area of skin that usually signifies an allergic reaction, not an infection. The TST looks for induration, which is a firm swelling, as a sign of TB infection.
Choice B Reason:
A 5 mm induration is considered positive in certain high-risk groups, such as people living with HIV, recent contacts of TB patients, or those with a history of organ transplants. For individuals without these risk factors, a 5 mm induration is not considered a positive result.
Choice C Reason:
A 15 mm induration is considered a positive TST result for individuals with no known risk factors for TB. This indicates that the person's immune system has reacted to the tuberculin purified protein derivative (PPD) injected under the skin, suggesting exposure to TB bacteria.
Choice D Reason:
Erythema, or redness of the skin, is not measured when interpreting TST results. The test measures induration, which is a palpable, raised, hardened area or swelling. Therefore, a 4 mm erythema does not indicate TB infection.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A reason:
Morphine is an opioid analgesic that can cause a decrease in gastrointestinal motility, leading to constipation and exacerbation of paralytic ileus, a condition where there is a cessation of peristalsis in the intestine. In the case of paralytic ileus, the intestinal contents cannot move, which can lead to bowel distention, pain, and further complications. Therefore, morphine is contraindicated in clients with paralytic ileus due to the risk of worsening the condition..
Choice B reason:
While morphine can suppress cough and provide some relief in respiratory conditions, it is not contraindicated in bronchitis pleurisy unless respiratory depression is present. However, caution is advised as morphine can cause respiratory depression and should be used carefully in patients with underlying respiratory disorders.
Choice C reason:
Morphine is often used in the management of acute myocardial infarction (MI) to relieve chest pain, reduce anxiety, and decrease the workload on the heart by lowering blood pressure and heart rate. It is not contraindicated in MI; in fact, it can be beneficial in managing the symptoms associated with MI.
Choice D reason:
Postoperative pain management following hip arthroplasty often includes opioids like morphine. Morphine is not contraindicated in this situation and can be used to control postoperative pain, provided that the patient's respiratory function is closely monitored
Correct Answer is A
Explanation
Choice A reason:
The inability to move toes can be an early sign that a cast is too tight. This symptom may indicate that the cast is impinging on nerves or blood vessels, leading to decreased motor function. It is essential to address this immediately to prevent further complications such as permanent damage or compartment syndrome.
Choice B reason:
Edema, or swelling of the toes, can occur if a cast is too tight, but it may not be the first sign observed. Swelling is a response to increased pressure in the tissues and can develop over time as fluid accumulates. While it is a concern, it often follows other symptoms such as changes in sensation or movement.
Choice C reason:
Pallor of the toes, indicating reduced blood flow, can be a sign of a cast that is too tight. However, pallor may not be as immediately noticeable as the inability to move toes or changes in sensation. It is still a critical sign that requires prompt evaluation and possible adjustment of the cast.
Choice D reason:
A change in the temperature of the toes, such as them becoming cooler to the touch, can suggest impaired blood flow due to a tight cast. This sign, along with pallor, may develop after other symptoms such as numbness or motor impairment.
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