What is the main reason for cleaning and preparing a site before electrode placement?

Cleaning and preparing a site before electrode placement is crucial primarily to achieve optimal recording quality. The accuracy and reliability of the data obtained during polysomnography depend heavily on the quality of the electrode connections to the scalp and other areas. The presence of dirt, oils, or other contaminants on the skin can interfere with the electrical signals that the electrodes are designed to detect. This interference can lead to artifacts in the data, making it difficult to interpret the sleep study accurately. By ensuring that the skin is clean and properly prepared, technicians help to facilitate strong, clear signals necessary for effective monitoring and analysis of the patient's sleep patterns.