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Electrocardiography and Blood Pressure measurement Introduction Background Blood pressure (BP) is the force exerted on the cell walls of the blood vessels by the blood they contain. Blood pressure is measured with a sphygmomanometer, in millimetres of mercury (mmHg) this is a manual way of measuring BP, there is also a mechanical way. The mechanical tool for measuring blood pressure is called an automated blood pressure monitor; this automatically measures the subjects BP and heart rate at a touch of a button. The advantage of using the automated BP monitors is that it removes human error. Pressure is created by a portion of the body's blood being stored in the distensible aorta, which occurs due to the peripheral vessels not allowing blood to flow into the atrial system as fast as it's ejected from the heart. The heart beats approximately 72 times every minute, therefore each cycle lasts approximately 0.8 seconds. The cardiac cycle can...

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