Ventricular pressure-volume, usually refers to the concept of the left ventricular pressure-volume loop. The significance of the left ventricular pressure-volume ring is to reflect the relationship between internal pressure and volume of the left ventricle during the cardiac cycle. The ring has left ventricular pressure on the vertical axis and left ventricular volume on the horizontal axis, and is labeled counterclockwise with six points, a, b, c, d, e, and f. The ring has six segments. Segment ca implies that the period is the filling phase of the cardiac cycle, i.e., fast filling, slow filling, and atrial systole; segment cd implies that the period is isovolumic systole; segment de implies that the period is fast ejection; segment ef implies that slow ejection; and segment fa implies isovolumic diastole. When the left ventricular pressure-volume ring appears to move left, right, up and down, it suggests that there may be diseases such as increased heart rate, heart failure and other related diseases, and it is recommended to go to the regular hospital in a timely manner to avoid delays in the condition.