Learning outcome
Gain hands-on experience in analysing basic biopotential amplifiers electronics circuitry.
Background
Sequences of rhythmic contractions and relaxations of the cardiac muscle (also known as heartbeats) are the driving force behind the circulation of blood in the human body. The mechanical activity of the cardiac muscle generates a time varying dipole electric field that extends throughout the human body.
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The presence of such electric field on the torso gives rise to electrical potential differences on the surface (skin) of the chest and limbs. A small potential difference (the peak value is typically 1mV) between two points on the chest may be recorded using ECG electrodes that are adhered to the skin.
An ECG is a recording of such a dynamic potential difference between two distant electrodes on the chest. ECG recordings are utilised by clinical personnel for the non-invasive check of the heart rhythm.
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