A Matter of Precision

“The mitral valve,” Dr. Finch continued, tapping a diagram on the whiteboard, “is one of the heart’s four valves. It ensures blood flows in one direction—from the left atrium to the left ventricle. In cases of prolapse, the valve doesn’t close properly, allowing blood to leak backward, which we call regurgitation.”

She stepped closer to the model, which was a lifelike replica of a human heart. “In