When caring for a patient who has been admitted for his heart failure, the nurse observes that the patient is experiencing bradycardia. Which drug should be administered to patients who develop bradycardia?
Atropine
Cholestyramine
Inamrinone
Milrinone
The Correct Answer is A
A. Atropine is an anticholinergic medication that increases heart rate by blocking vagal effects on the heart, making it the first-line treatment for symptomatic bradycardia.
B. Cholestyramine is a bile acid sequestrant used to lower cholesterol levels and does not have any effects on heart rate.
C. Inamrinone is a phosphodiesterase inhibitor used in heart failure for inotropic support but is not specifically indicated for bradycardia management.
D. Milrinone is also a phosphodiesterase inhibitor used for heart failure but does not address bradycardia directly.
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Correct Answer is C
Explanation
A. It has a peak effect of 4-6 hours is incorrect; short-acting insulin typically peaks between 2 to 3 hours after administration.
B. It should be given once daily in the evening is incorrect; short-acting insulin is usually administered before meals, not as a once-daily dose.
C. It starts to take effect within 30 minutes to 1 hour after administration is correct; this timing is critical for managing blood glucose levels during meals.
D. It has a duration of action of 24 hours is incorrect; short-acting insulin usually has a duration of about 3 to 6 hours.
Correct Answer is D
Explanation
A. Liver failure does not have a direct contraindication with bronchodilators, though careful monitoring is needed.
B. Renal failure is not a direct contraindication for bronchodilator use; however, kidney function can affect drug metabolism and clearance.
C. Respiratory failure may necessitate bronchodilator therapy rather than caution, especially in conditions like COPD or asthma where bronchodilators are crucial for management.
D. Heart failure requires caution with bronchodilators because they can lead to increased heart rate and blood pressure, potentially exacerbating heart failure symptoms or leading to arrhythmias.