To the Editor: 

I found the recent report by Harmon and colleagues on inpatient electroencephalography (EEG) very interesting.¹ The authors concluded that “inpatient EEGs rarely contributed to clinical decision making and in no case resulted in a change in diagnosis or management.”¹ Thus, the question that remains is whether inpatient EEG is useless. In fact, the study was retrospective, and there are many factors that could not be controlled. I believe it is important to consider the rational use of investigation.² In other words, similar to any investigation in medicine, the inpatient EEG should be used only if there is indication. Harmon and colleagues¹ did not determine whether all cases had fulfilled indication. The inpatient EEG can be very useful—if the physician has been well educated on proper procedures and indications.