Preparation, patient protection and equipment safety
Safe neurodiagnostic preparation begins with identity, the indication, relevant history, the authorized plan and the person’s communication needs. Confirm the intended procedure and known allergies, wounds, implanted devices or restrictions before setup. A technologist should explain the practical process and limitations in understandable language, use appropriate language support and seek clarification where the planned activity is outside competence or the supplied instructions are incomplete.
Electrode or sensor preparation should follow the actual method and manufacturer instructions. Inspect skin and avoid unnecessary injury. A particular impedance number is not a universal rule for every amplifier or electrode type, although suitable contact and balanced inputs often matter. Label channels, sites and laterality accurately. Check the equipment and leads for damage rather than accept a plausible-looking trace as proof of electrical safety.
Implanted devices require specific review. A stimulator may generate artifact and may create additional considerations with the actual monitoring or stimulation system. Do not turn it off, alter its settings or stop a medicine independently to improve the recording. Coordinate with the responsible clinical and device team. Passive MEG acquisition is not MRI excitation, but that distinction does not eliminate the need to assess accessories, devices and any separate MRI procedure.
Protect the patient during the study. Clinical events, changing symptoms, movement, positioning problems and skin concerns may require immediate action or modification. Data acquisition must not delay necessary assistance. During surgery, stimulation-related movement, electrode risks, sharps, the sterile field and interaction with other equipment need coordinated safeguards. A technologist’s familiarity with a physiological concept does not authorize anesthesia changes or invasive clinical management.
Conventional cryogenic MEG systems introduce cold, pressure and oxygen-displacement hazards that differ from ordinary EEG preparation. Follow the trained laboratory procedure and do not improvise a dewar repair or enter an oxygen-deficient area without the qualified emergency response. Reprocess reusable items according to the appropriate classification and instructions, and never assume that a single-use invasive electrode can be made reusable by a convenient cleaning step. Written safety practice cannot establish operational competency or replace local emergency and equipment procedures.