When the heart rests between beats, the coronary arteries receive and supply the heart with oxygen-rich blood. Low diastolic blood pressure, or isolated diastolic blood pressure, is when the diastolic blood pressure falls below 60 mm Hg while the systolic blood pressure remains at a normal level. Low blood pressure, or hypotension, is blood pressure that is below 90/60 mm Hg. In most adults, a healthy reading is usually less than 120/80 mm Hg. A doctor will assess a person’s blood pressure by considering both numbers. It measures how much pressure the blood applies to the artery walls when the heart beats.ĭiastolic blood pressure is the lower number, which shows the pressure the blood applies to the artery walls when the heart rests between beats.Ī blood pressure reading will show the systolic blood pressure number first and diastolic blood pressure second. Systolic blood pressure is the top number and is the higher of the two. The numbers measure systolic blood pressure and diastolic blood pressure. Blood pressure readings use two numbers that doctors record in millimeters of mercury (mm Hg).
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