Blood pressure is measured in millimetres of mercury (mmHg), for example 120/80 mmHg (known as 120 over 80). The diastolic reading (the second number) indicates the pressure within the arteries when the heart is at rest. The systolic reading (the first number of the 2) indicates the pressure of blood within your arteries during a contraction of the left ventricle of the heart. Usually, the point at which the sounds disappear is known as the diastolic pressure. As the doctor continues to lower the pressure in the cuff, the sounds will disappear. The pressure reading on the sphygmomanometer when the sound of blood is first heard pulsing through the artery is known as the systolic pressure. As the pressure is lowered, your doctor will listen through a stethoscope for the sound of blood starting to pulse through the brachial artery again.
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