This is the blood pressure when the heart is dilated. It is also called the diastolic blood pressure because blood pressure is at its lowest when blood circulating throughout the body returns to the heart from the pulmonary veins. Blood pressure values are determined by blood vessel stiffness (vascular resistance) and blood volume (cardiac output). When blood viscosity increases or blood vessels harden, blood becomes less able to flow and pressure on the blood vessel walls increases. High blood pressure is diagnosed at 90mmHg or above. Minimum blood pressure. Minimum blood pressure. Diastolic blood pressure. → Systolic blood pressure Source: About Shogakukan Digital Daijisen Information | Legend |
心臓が拡張したときの血圧。全身を循環する血液が肺静脈から心臓へ戻った状態で、血圧が最も低くなるため、最低血圧とも呼ばれる。血圧値は血管の硬さ(血管抵抗)と血液量(心拍出量)によって決まる。血液の粘度が高くなったり、血管が硬化したりすると、血液が流れにくくなり、血管壁にかかる圧力が高くなる。90mmHg以上で高血圧と診断される。最小血圧。最低血圧。弛緩期血圧。→収縮期血圧
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