Antihypotensive

Antihypotensive

Antihypotensive agents are medications used to treat low blood pressure, also known as hypotension. These agents work by various mechanisms to increase blood pressure and improve blood flow to vital organs. Hypotension can be a result of various conditions, including dehydration, heart problems, endocrine disorders, and severe infections. Antihypotensive drugs are crucial in managing acute and chronic hypotensive states.

Mechanism of Action

Antihypotensive agents can work through several mechanisms:

• Vasoconstrictors: These drugs, such as norepinephrine and phenylephrine, constrict blood vessels, increasing vascular resistance and thereby raising blood pressure.

• Volume Expanders: Agents like intravenous fluids and albumin increase blood volume, which can help raise blood pressure in cases of hypovolemia.

• Inotropes: Drugs such as dopamine and dobutamine increase the force of heart contractions, improving cardiac output and blood pressure.

• Mineralocorticoids: Fludrocortisone is used to increase sodium retention, which helps increase blood volume and pressure.

Indications

Antihypotensive agents are indicated in various clinical scenarios, including:

• Acute Hypotension: Such as in shock or severe dehydration.
• Chronic Hypotension: Conditions like Addison's disease or orthostatic hypotension.
• Postural Hypotension: Often seen in elderly patients or those on certain medications.

Side Effects

The use of antihypotensive agents can lead to several side effects, including:

• Hypertension: Overcorrection of blood pressure can lead to high blood pressure.
• Arrhythmias: Some agents, particularly inotropes, can cause irregular heartbeats.
• Tissue Necrosis: Vasoconstrictors can cause tissue damage if extravasation occurs.

Monitoring

Patients on antihypotensive therapy require careful monitoring of:

• Blood Pressure: To ensure therapeutic levels are achieved without causing hypertension.
• Heart Rate: Especially with inotropes, to detect arrhythmias early.
• Electrolytes: Particularly with volume expanders and mineralocorticoids.

Also see

• Hypotension
• Shock (circulatory)
• Vasopressor
• Inotropic agent

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