All the following statements are true, except?
**Core Concept**
The question tests the understanding of the pathophysiology and management of cardiovascular diseases, specifically the role of beta-blockers in acute myocardial infarction (AMI).
**Why the Correct Answer is Right**
Beta-blockers are a cornerstone in the management of AMI. They reduce myocardial oxygen demand by decreasing heart rate and contractility, thus reducing the workload on the heart. This is particularly beneficial in the setting of AMI, where the heart is already under stress. Beta-blockers also have anti-arrhythmic properties, which can help prevent arrhythmias and sudden cardiac death.
**Why Each Wrong Option is Incorrect**
**Option A:** This statement is incorrect because beta-blockers are not typically used as a first-line treatment for hypertension in the acute phase of AMI. In fact, their use in this context may even worsen cardiac output and increase myocardial oxygen demand.
**Option B:** This statement is incorrect because beta-blockers are not contraindicated in patients with bronchial asthma. While beta-agonists can exacerbate asthma, beta-blockers can be used cautiously in patients with asthma, especially if they are on long-term beta-agonist therapy.
**Option C:** This statement is incorrect because beta-blockers are not a cause of hypoglycemia. In fact, beta-blockers can mask the symptoms of hypoglycemia, such as tachycardia and tremors.
**Clinical Pearl / High-Yield Fact**
Beta-blockers should be initiated at a low dose and titrated upwards gradually in patients with AMI to avoid exacerbating cardiac output and increasing myocardial oxygen demand.
**Correct Answer: A. Beta-blockers are not typically used as a first-line treatment for hypertension in the acute phase of AMI.**