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7. EXECUTION OF THE EXAMINATION
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7. EXECUTION OF THE EXAMINATION
7.1. Preparing the patient
Ensure that the patient fully understands the procedure and knows what to expect before connecting the
electrodes.
Privacy is very important to allow the patient to be relaxed.
Reassure the patient that the procedure is painless, and that he/she will only feel the electrodes on
the skin.
Make sure that the patient is relaxed and in a comfortable position. If the table is narrow, insert the
hands of the patient under the buttocks to ensure the muscles are relaxed.
Once the electrodes are connected, ask the patient to remain still and not to talk. Explain that this is
important to ensure a good ECG acquisition.
7.1.1. Preparing the patient's skin
A proper cleaning of the skin is of the utmost importance. There is a natural electric resistance on the
surface the skin, generated by sources such as hair, sebum, and dry or dead skin. Adequately prepare the
skin to minimize the aforementioned effects and optimize the quality of the ECG signal.
To prepare the skin:
If necessary, shave the skin area where the electrode must be applied.
Wash the area with hot soapy water.
Dry the skin vigorously with an abrasive pad, such as a 2x2 or 4x4 gauze, to remove dead skin cells
and fat.
NOTE: Pay attention not to cause abrasions, discomfort or bruises on the skin.
Always observe the utmost clinical discretion when preparing the patient.
7.2. Connecting the patient
It is important to position the electrodes properly in order to acquire a good electrocardiographic signal.
A low impedance ensures a better waveform, reducing noise. Quality silver-silver chloride (Ag/Agl)
electrodes should be used.
NOTE: The electrodes should be stored in an airtight container. If not properly stored, they will dry resulting in
a loss of adhesion and conductivity.
Connect the electrodes
1. Expose the arms and legs of the patient to connect the relevant leads.
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