A 55-year-old man is given general anesthesia for an elective procedure. His left ventricular pressure-volume loop has switched from a solid line to a dashed line after two hours of surgery, as seen in the figure below ( the loop is unchanged in areas where there is no dashed line): Which of the following is most likely responsible for this patient's hemodynamic change?

Question

A 55-year-old man is given general anesthesia for an elective procedure. His left ventricular pressure-volume loop has switched from a solid line to a dashed line after two hours of surgery, as seen in the figure below ( the loop is unchanged in areas where there is no dashed line):  Which of the following is most likely responsible for this patient's hemodynamic change?

Quizplus · Accepted Answer

Eductional Objective: When normal saline is infused, the left ventricular (LV) pressure volume loop's bottom right corner (point 1) shifts to the right, indicating increased end-diastolic volume or preload. Greater LV stretching, increased stroke volume, and a modest rise in afterload are all results of the increased preload (Frank-Starling law).

A 55-Year-Old Man Is Given General Anesthesia for an Elective