The nurse is caring for a patient experiencing severe chest pain. Five minutes after administering the nitroglycerin 0.4 mg sublingually, the client states no change at all in his pain level. The next immediate nursing action is which of the following?

A. Encourage the use of sunglasses when outside: Sunglasses are useful for reducing glare and light sensitivity, but they do not address the underlying cause of diplopia (double vision) in Multiple Sclerosis (MS). Diplopia is often due to neurological damage affecting the eye muscles or nerve pathways, not from light sensitivity.

B. Assess for conjunctival bleeding: Conjunctival bleeding (bleeding under the eye's clear surface) is not related to diplopia. Diplopia in MS is caused by problems with the nerves or muscles controlling eye movement, and assessing for conjunctival bleeding would not help in managing the double vision.

C. Alternate the use of an eye patch on each eye: Diplopia in MS is commonly caused by eye misalignment due to nerve damage. Using an eye patch on one eye at a time can temporarily help by blocking vision in one eye, allowing the brain to focus and alleviating the perception of double vision. Alternating the patch between eyes is a common strategy to manage diplopia while treating the underlying neurological issues.

D. Apply cool compresses for pain relief: Cool compresses might help with general eye discomfort, but they do not directly address diplopia. Diplopia due to MS is usually caused by muscle or nerve issues rather than discomfort that could be relieved by cool compresses.

A. Contact the prescriber because the current prescription is at an unsafe dose: The prescribed dose of 540 mg three times per day totals 1620 mg in 24 hours, which exceeds the maximum safe dosage of 1500 mg for pyridostigmine (Mestinon). The nurse should immediately contact the prescriber to clarify or adjust the prescription to ensure the patient is not put at risk for toxicity.

B. Instruct the patient to take their medication with juice & crackers if stomach upset occurs: While taking pyridostigmine with food may help minimize gastrointestinal upset, this is not the priority concern. The primary issue is the unsafe dosage. The nurse should focus on addressing the dosage error before providing further instructions on food intake.

C. Inform the patient that abdominal cramping & diarrhea will decrease as their body adjusts: While abdominal cramping and diarrhea are common side effects of pyridostigmine, this does not address the critical issue of the unsafe dosage. The nurse should first ensure that the prescription is safe before discussing side effects.

D. Remind the patient to take their doses on time to prevent cholinergic crisis: While it is important for patients with myasthenia gravis to take their medication on time to avoid cholinergic crisis (a potentially life-threatening condition due to excessive cholinergic activity), this is secondary to ensuring the dosage is correct. The priority action is to contact the prescriber regarding the unsafe dose.