Questions and Answers
Beta blockers decrease the sympathetic response by blocking which neurotransmitters? (Select all that apply)
Which therapeutic effect is expected in a patient prescribed a beta blocker after a myocardial infarction?
Which time frame is the half-life of propranolol extended release?
Which beta blockers block both beta1 and beta2 receptors? (Select all that apply)
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Cardioselective beta blockers are preferred for patients with which medical conditions? (Select all that apply)
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What should Mr. C do if he wants to take an antacid while on metoprolol?
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Which sign or symptom should Mr. C report immediately while taking metoprolol?
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Over how many minutes should metoprolol be administered intravenously?
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Propranolol is contraindicated for a patient with which conditions? (Select all that apply)
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What should a patient taking extended-release metoprolol know about how to take the medication?
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Study Notes
Beta Blockers Overview
- Beta blockers decrease sympathetic nervous system response by blocking catecholamines, specifically epinephrine and norepinephrine.
- Commonly used after myocardial infarction to reduce myocardial workload, decrease dysrhythmias, and lower blood pressure.
Propranolol Specifics
- The half-life of extended release propranolol is approximately 8 to 10 hours.
- Propranolol, along with pindolol and carvedilol, blocks both beta1 and beta2 receptors.
Cardioselective Beta Blockers
- Preferred in patients with diabetes and respiratory disease to minimize adverse effects on these conditions.
Medication Administration Guidelines
- Metoprolol should be taken at least 2 hours before or after antacids to ensure proper absorption.
- Intravenous metoprolol must be administered slowly over 1 to 2 minutes.
Monitoring and Reporting
- Patients taking metoprolol must report any swelling of feet and legs, as it may indicate heart failure.
- Heart rate should be monitored, and a rate of 65 beats/min should not be ignored.
Contraindications and Precautions
- Propranolol is contraindicated in patients with heart failure due to the risk of suppressed myocardial contractility.
- It is also contraindicated in those with sinus bradycardia, as it may worsen the condition.
Extended-Release Metoprolol
- Metoprolol extended-release should be taken whole; it should not be crushed or chewed.
- Patients must understand the importance of regular dosing and must not skip doses unnecessarily.
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Description
Test your knowledge on Class II antidysrhythmic therapy, focusing specifically on beta blockers. This quiz will cover the mechanisms of action of beta blockers and their effect on neurotransmitters. Understand the role of epinephrine and norepinephrine in the sympathetic response.
