Which preparation is essential for patients prior to an EEG?

Avoiding caffeine before an EEG is crucial because caffeine can significantly affect brain activity and the results of the test. Caffeine is a stimulant that may lead to increased electrical activity in the brain, potentially obscuring underlying conditions that the EEG is intended to evaluate, such as seizure activity or abnormalities in brain waves. By refraining from caffeine, patients can help ensure that the EEG provides a clearer, more accurate representation of their baseline brain function.

In contrast, increasing physical activity, eating a large meal, or taking extra medications are not appropriate preparations for an EEG. High physical activity could potentially alter the brain's electrical patterns during the test. Eating a large meal could result in discomfort or distraction, making it challenging for the patient to relax and produce accurate readings. Additionally, taking extra medications without medical guidance could interfere with the results of the EEG, making it difficult to interpret the data correctly. Focusing on avoiding caffeine helps to prepare the patient appropriately for the exam.