The nurse is caring for a client newly diagnosed with hypothyroidism. The client also takes theophylline to control asthma symptoms.
What change may need to be made to the client’s theophylline dose?
Decrease theophylline dosage immediately.
Decrease theophylline dose when normal thyroid function returns.
Discontinue the client’s theophylline.
Increase theophylline dosage immediately.
The Correct Answer is B
This is because hypothyroidism can reduce the metabolism and clearance of theophylline, leading to higher serum levels and increased risk of toxicity. Therefore, when the thyroid function is restored by levothyroxine or liothyronine, the dose of theophylline may need to be lowered to avoid excessive effects.
Choice A is wrong because decreasing theophylline dosage immediately may result in suboptimal control of asthma symptoms.
The dose adjustment should be based on serum theophylline levels and clinical response.
Choice C is wrong because discontinuing the client’s theophylline may cause worsening of asthma and potentially life-threatening complications.
Theophylline is an important bronchodilator that should not be stopped abruptly without medical supervision.
Choice D is wrong because increasing theophylline dosage immediately may cause overdose and adverse effects such as nausea, vomiting, headache, tachycardia, arrhythmias, seizures and even death.
The dose of theophylline should be carefully titrated according to serum levels and clinical response.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Oxygen cannot diffuse rapidly across the membrane to tissues in the eye. This is because diabetic retinopathy is a condition that occurs when high blood sugar levels damage the tiny blood vessels that nourish the retina, the light-sensitive tissue at the back of the eye. As a result, the retina becomes ischemic (lacking oxygen) and tries to grow new blood vessels that are fragile and leaky.
Choice A is wrong because inability of cells in the eye to reproduce is not a cause of diabetic retinopathy.
The retina has a high metabolic rate and needs a constant supply of oxygen and nutrients to function properly.
Choice B is wrong because increase of aqueous humor in the eye is not a cause of diabetic retinopathy.
Aqueous humor is the clear fluid that fills the front part of the eye, not the retina.
An increase of aqueous humor can cause glaucoma, which is a different eye disorder that affects the optic nerve.
Choice C is wrong because decrease of nerve innervations throughout the eye is not a cause of diabetic retinopathy.
Nerve innervations are the connections between nerves and other tissues, such as muscles or glands.
Diabetic retinopathy affects the blood vessels, not the nerves, of the retina.
Correct Answer is C
Explanation
Hypercalcemia is a condition caused by having too much calcium in the blood, which can affect the function of nerves, muscles, kidneys and heart. Hypercalcemia can occur in children due to various causes, both acquired and genetic. One of the most common causes of hypercalcemia in children is cancer, especially cancers that affect the bones or produce substances that mimic parathyroid hormone (PTH), which regulates calcium levels.
Choice A is wrong because liver failure does not directly cause hypercalcemia, although it can affect vitamin D metabolism and calcium absorption.
Choice B is wrong because radiation injury does not cause hypercalcemia, unless it damages the parathyroid glands or causes bone destruction.
Choice D is wrong because hypothyroidism does not cause hypercalcemia, although it can affect bone turnover and calcium excretion.
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