The doctor orders 250 mg of an antibiotic. The stock supply is a vial of 250 mg of the drug. Directions say to reconstitute with 1.7 mL of sterile water to yield 2 mL of the drug. How many milliliters will you give for the correct dose?

A) A headache indicates tolerance to the medication:
A headache does not indicate tolerance to nitroglycerin. Tolerance typically refers to the need for increasing doses to achieve the same therapeutic effect, which is more common with medications like nitroglycerin when used chronically.

B) It sounds as if you are allergic to this medication:
While headaches are a common side effect of nitroglycerin, they are not an allergic reaction. Allergies typically cause symptoms such as rash, itching, or swelling, and are not typically associated with nitroglycerin use. Therefore, attributing the headache to an allergy would be inappropriate.

C) Your headache is probably a result of anxiety about the chest pain:
While anxiety can contribute to physical symptoms like headaches, it is not the most likely cause in this case. Nitroglycerin causes vasodilation, which can lead to headaches as a common side effect. Given that the headache occurred shortly after taking the medication, it is much more likely that the headache is a direct result of the nitroglycerin rather than anxiety about the chest pain.

D) A headache is a common adverse effect of this medication, but it will probably occur less often over time:
Headaches are a well-known and common side effect of nitroglycerin due to its vasodilatory effect, which can cause blood vessels in the head to expand, leading to a headache. The nurse's response is appropriate because it reassures the client that the headache is a typical reaction and that it often becomes less frequent with continued use. The nurse should also remind the client to take the medication as prescribed, and if the headache persists or worsens, they should notify their healthcare provider.

A) RR 18 bpm:
A respiratory rate of 18 breaths per minute is within the normal range for adults (12-20 bpm). Therefore, this finding does not pose a significant concern in the context of digoxin therapy. Respiratory rate should be monitored, especially if the patient is experiencing signs of heart failure or digoxin toxicity, but 18 bpm alone is not alarming.

B) 1+ pitting edema of the lower extremities:
Pitting edema, especially with a grade of 1+ (slight indentation), is a common finding in patients with congestive heart failure (CHF). It indicates fluid retention due to the heart's inability to pump blood effectively. While edema should be monitored, it is not immediately life-threatening or specific to digoxin toxicity.

C) BP 138/90 mm Hg:
A blood pressure of 138/90 mm Hg is slightly elevated, but it is not excessively high. This finding is manageable and should be monitored, particularly in heart failure patients, but it does not present an immediate concern in this case. Blood pressure management is crucial in CHF, but it does not directly correlate with digoxin toxicity.

D) Heart rate 54 beats/min:
A heart rate of 54 beats per minute is considered bradycardic, especially in a patient taking digoxin. Digoxin can lower heart rate by increasing vagal tone and inhibiting the AV node. Bradycardia is a well-known sign of digoxin toxicity, and this finding is concerning because it may indicate that the patient is experiencing toxicity. Digoxin-induced bradycardia can lead to more serious arrhythmias or hemodynamic instability, making this the most concerning finding that requires immediate assessment and possibly intervention.