The nurse administers teriparatide and evaluates the drug as effective in achieving desired effects when what is assessed?

Phenothiazines are contraindicated in patients with suspected or established subcortical brain damage. Phenothiazines are a class of drugs that have antipsychotic, antiemetic, and sedative effects. They act by blocking dopamine receptors in the brain and can cause extrapyramidal symptoms, hypotension, and anticholinergic effects.

Choice B is wrong because phenothiazines are not contraindicated in patients with ischemic heart disease.

However, they can cause orthostatic hypotension and cardiac arrhythmias, so they should be used with caution and monitored closely in these patients.

Choice C is wrong because phenothiazines are not contraindicated in pediatric patients.

However, they can cause sedation, hypotension, and extrapyramidal symptoms, so they should be used with caution and at lower doses in these patients.

Choice D is wrong because phenothiazines are not contraindicated in patients with type 2 diabetes.

However, they can cause hyperglycemia and weight gain, so they should be used with caution and monitored closely in these patients.

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.