Class, Table or Global that store data from Record History of patient

Hello everyone,

I am working in the HealthShare, and I need to check some modification during a period of time in the records of a patient. But I don't want to use HealthShare managment portal, I want to create some querys because are many records of patient. I tried to find the Globals or Tables that are used by Iris in the Record History function. ChatGPT helped me, saing that the table is HS.IHEX.RecordHistory and the global ^HS.IHEX.RecordHistory, but I didn't find any data in the global or table. Can someone help me? Anyone knows a way to do querys for the Record History and see the changes that occur in that specific patient during the time?

Best Regards,
Flavio.