👉 The term "diastolic" refers to a measurement of blood pressure in which the heart is contracting and relaxing. It's measured by measuring how much time it takes for one heartbeat (the systole) compared to another heartbeat (the diastole). The diastolic measure helps doctors understand how well the heart is pumping blood throughout the body, as well as how well it's working to keep the heart rate under control and maintain a stable heart rhythm.