For which of the following patients would the RN anticipate an order for sodium bicarbonate IVP?

Rationale for Choice A: Nitroglycerin IV gtt, titrate for SBP > 180mmHg

Mechanism of action: Nitroglycerin is a potent vasodilator that acts primarily on veins, but also has some arterial vasodilatory effects. It relaxes vascular smooth muscle by stimulating the production of nitric oxide, which causes vasodilation. This decrease in preload (venous return to the heart) and afterload (resistance against which the heart pumps) leads to a reduction in blood pressure.

Indications: Nitroglycerin is a preferred agent for hypertensive emergencies associated with acute heart failure, acute coronary syndromes, and aortic dissection. It is also effective in hypertensive emergencies with elevated intracranial pressure.

Dosage and administration: Nitroglycerin is typically administered as an intravenous infusion, starting at a low dose and titrating up based on blood pressure response. The goal is to titrate the medication to maintain systolic blood pressure below 180 mmHg.

Contraindications: Nitroglycerin is contraindicated in patients with a known hypersensitivity to nitrates, severe hypotension (systolic blood pressure < 90 mmHg), or those who have recently used phosphodiesterase-5 inhibitors (such as sildenafil).

Monitoring: During nitroglycerin infusion, it's essential to monitor blood pressure closely, as well as heart rate, for any signs of hypotension or tachycardia.

Rationale for Choice B: Labetalol (Normodyne) 10mg IVP q 10 minutes prn for SBP >170 mmHg

Mechanism of action: Labetalol is a mixed alpha- and beta-adrenergic blocker. It blocks the effects of norepinephrine and epinephrine, leading to vasodilation and a decrease in heart rate.

Indications: Labetalol is a versatile agent that can be used in various hypertensive emergencies, including those associated with acute aortic dissection, acute coronary syndromes, and pre-eclampsia/eclampsia. It's also useful in patients with a history of asthma or chronic obstructive pulmonary disease (COPD), as it has less bronchoconstrictive effects than beta-blockers like propranolol.

Dosage and administration: Labetalol can be administered as an intravenous bolus or infusion. In this scenario, it's prescribed as a 10mg intravenous push every 10 minutes as needed for systolic blood pressure greater than 170 mmHg.

Contraindications: Labetalol is contraindicated in patients with severe bradycardia, heart block, cardiogenic shock, or decompensated heart failure.

Monitoring: During labetalol administration, it's important to monitor blood pressure, heart rate, and electrocardiogram (ECG) for any signs of bradycardia, heart block, or other arrythmias.

Rationale for Choice D: Nitroprusside (Nitropress) IV gtt titrate to keep SBP < 160 mmHg

Mechanism of action: Nitroprusside is a potent vasodilator that acts directly on both arterioles and veins. It relaxes vascular smooth muscle by releasing nitric oxide, leading to a rapid and profound decrease in blood pressure.

Indications: Nitroprusside is often reserved for hypertensive emergencies that are refractory to other agents or those that require rapid blood pressure control, such as hypertensive encephalopathy or acute aortic dissection.

Dosage and administration: Nitroprusside is administered as an intravenous infusion and titrated to the desired blood pressure response. The goal is to keep systolic blood pressure below 160 mmHg.

Contraindications: Nitroprusside is contraindicated in patients with severe renal impairment or those with increased intracranial pressure.

Monitoring: Nitroprusside therapy requires close monitoring of blood pressure, as well as monitoring for thiocyanate toxicity (a metabolite of nitroprusside) in patients with prolonged infusion or renal impairment.

Choice A rationale:

Fever is not a common side effect of metformin. While it's possible for a minority of patients to experience a mild fever as their bodies adjust to the medication, it's not considered a typical or expected adverse effect.

Fevers typically occur due to infections or inflammation, and metformin does not directly cause either of these processes.

If a patient taking metformin develops a fever, it's crucial to rule out other potential causes, such as infections or other medications, before attributing it to metformin.

Choice B rationale:

Insomnia is also not a common side effect of metformin. In fact, some studies have suggested that metformin may even have a positive effect on sleep quality in some individuals.

While sleep disturbances can occur with any medication, they are not specifically associated with metformin.

If a patient experiences insomnia while taking metformin, it's essential to consider other potential factors, such as stress, anxiety, or other medications, that could be contributing to sleep problems.

Choice C rationale:

Bitter or metallic taste is a very common side effect of metformin, experienced by approximately 30-40% of patients. This taste disturbance is thought to be caused by metformin's interaction with taste receptors on the tongue.

The taste is often described as metallic, bitter, or similar to the taste of pennies.

While it can be unpleasant, it's generally not considered a serious side effect and does not usually require discontinuation of the medication.

Some strategies to manage the metallic taste include: Taking metformin with meals or snacks to mask the taste.

Chewing sugar-free gum or sucking on hard candy after taking the medication. Rinsing the mouth with water or mouthwash after taking the medication.

Switching to an extended-release formulation of metformin, which may have a less pronounced metallic taste.

Choice D rationale:

Seizures are a rare but serious side effect of metformin.

They are most likely to occur in patients with underlying kidney problems or those taking certain other medications that can interact with metformin.

If a patient taking metformin experiences a seizure, it's critical to seek immediate medical attention.