Systemic vascular resistance is 1700 dynes cm?5. Which of the following is consistent with this value?
a. Elevated left-ventricular af-terload c. Decreased left-ventricular pre-load
b. Elevated right-ventricular afterload d. Decreased right-ventricular preload
ANS: A
The normal range for systemic vascular resistance is 900 to 1500 dynes cm−5. Preload is defined as the filling pressure of the ventricles at the end of ventricular diastole. Afterload represents the resistance the ventricles must overcome to eject blood. Therefore, an elevated systemic vascular resistance would cause an elevated left-ventricular afterload.
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