Blood pressure refers to the pressure exerted by the blood flow on the artery wall when the heart transports blood. There are two measurement methods. "Systolic blood pressure" refers to the blood pressure produced by the delivery of blood when the heart beats. "Dystolism" refers to the blood pressure produced when the cardiac diastolic is at rest at the interval of the heart beat. The blood pressure value is usually written on or before the diastolic blood pressure value (for example, 120/80).