Contribution of Antihypertensive Medications to Orthostatic Hypotension
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How can antihypertensive medications contribute to orthostatic hypotension?
By reducing vascular resistance.
By increasing blood volume rapidly.
By enhancing cardiac output significantly.
By increasing calcium influx into cardiac cells.
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In this problem, we are asked how antihypertensive medications can lead to orthostatic hypotension. Let's start by defining our terms.
Understanding Antihypertensives and Orthostatic Hypotension
First, the goal of antihypertensive therapy is to lower blood pressure. To do this, these drugs often affect the biological drivers of pressure.
Blood pressure is equal to cardiac output times peripheral vascular resistance. If medications reduce either of these factors, the overall blood pressure drops.
Orthostatic hypotension, specifically, is a sudden drop in blood pressure when you stand up. This happens because gravity pulls blood towards the legs.
Orthostatic Hypotension
- Sudden drop in BP upon standing.
- Gravity causes venous pooling.
Normally, the body compensates for standing by constricting blood vessels to maintain resistance and pressure. However, antihypertensive medications interfere with this process.
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