A nurse is reinforcing teaching with a client who has tuberculosis (TB) and a prescription for isoniazid. Which of the following instructions should the nurse include?

Choice A reason: This is an incorrect instruction, because the client does not need to remain NPO, or nothing by mouth, before a standard EEG. The client can eat and drink normally, unless the provider instructs otherwise.

Choice B reason: This is an incorrect instruction, because the client should not take a sedative, or any other medication that can affect the brain activity, before a standard EEG. The client should take the usual medications, unless the provider instructs otherwise.

Choice C reason: This is the correct instruction, because the client should thoroughly shampoo hair prior to the EEG. The client should wash the hair with a mild shampoo and rinse well, without using any conditioner, gel, spray, or other hair products. This can help remove any oil, dirt, or residue that can interfere with the placement and function of the electrodes.

Choice D reason: This is an incorrect instruction, because the client should not take an additional dose of anticonvulsant medication before a standard EEG. The client should take the regular dose of anticonvulsant medication, unless the provider instructs otherwise.

Choice A reason: This is an incorrect finding, because elevated blood pressure is not a sign of hypoparathyroidism, which is a condition that occurs when the parathyroid glands produce insufficient parathyroid hormone (PTH). PTH regulates the calcium and phosphorus levels in the blood and bones. Elevated blood pressure can be a sign of hyperparathyroidism, which is the opposite condition.

Choice B reason: This is the correct finding, because involuntary muscle spasms are a sign of hypoparathyroidism, which causes hypocalcemia, or low blood calcium levels. Hypocalcemia can cause neuromuscular irritability and tetany, which are manifested by muscle spasms, twitching, cramps, or seizures.

Choice C reason: This is an incorrect finding, because cold intolerance is not a sign of hypoparathyroidism, but a sign of hypothyroidism, which is a condition that occurs when the thyroid gland produces insufficient thyroid hormone. Thyroid hormone regulates the metabolism and body temperature. Cold intolerance can also be a sign of Hashimoto's thyroiditis, which is an autoimmune disease that causes inflammation and destruction of the thyroid gland.

Choice D reason: This is an incorrect finding, because weight loss is not a sign of hypoparathyroidism, but a sign of hyperthyroidism, which is a condition that occurs when the thyroid gland produces excessive thyroid hormone. Thyroid hormone increases the metabolism and energy expenditure. Weight loss can also be a sign of Graves' disease, which is an autoimmune disease that causes overstimulation and enlargement of the thyroid gland.