American Association of Critical-Care Nurses (AACN) Certification Practice Test

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What does a high systemic vascular resistance (SVR) indicate?

  1. Low heart rate

  2. Vasodilation of blood vessels

  3. Vasoconstriction of blood vessels

  4. Increased venous return

The correct answer is: Vasoconstriction of blood vessels

A high systemic vascular resistance (SVR) typically indicates vasoconstriction of blood vessels. When the vascular resistance is elevated, it means that the blood vessels are constricted, which leads to increased resistance against the flow of blood. This results in the heart having to work harder to pump blood through these narrowed pathways. Vasoconstriction often occurs in response to various physiological demands such as increased blood pressure needs, reduced blood flow to certain areas, or as part of the body's response to stress. In contrast, scenarios involving low SVR usually relate to vasodilation, where blood vessels widen, reducing resistance and facilitating easier blood flow. Understanding SVR is crucial for clinicians as it provides insights into cardiovascular health and can guide treatment plans for conditions associated with abnormal vascular resistance.

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