It is difficult to say if one episode of memory disturbance , which may also be called as confusion, could be a symptom of Alzheimer's disease (AD).
Before one develops Alzheimer's, there is a stage called Mild cognitive impairment (MCI). It is often a transitional stage between normal aging and dementia. Although MCI can present with a variety of symptoms, when memory loss is the predominant symptom it is termed as "amnestic MCI" and is frequently seen as a prodromal stage of Alzheimer's disease. Studies suggest that people with MCI tend to progress to probable Alzheimer’s disease at a rate of approximately 10% to 15% per year. Some people with MCI may never progress to Alzheimer’s disease.
MCI is diagnosed when there is: evidence of memory impairment, preservation of general cognitive and functional abilities and absence of diagnosed dementia. However, the diagnosis of MCI requires a comprehensive clinical assessment including clinical observation, neuroimaging, blood tests and neuropsychological testing in order to rule out an alternate diagnosis.
I really appreciate your effort in picking up this problem. I would suggest that you take your dad to a Neuropsychologist and Dementia expert after consulting your GP for a detailed evaluation.
Hope that this information helps and hope that you will get better soon.
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Dr. Shiva Kumar R.
But can something like this be just a normal one time mistake?
Don't worry, nothing to get scared it's normal to do mistakes like this even I also had done something like this and I am only 23
Dr. Kumar seems to be over-reacting. You could go the doctor route (in which case they are bound to find "something"). If it were me I would keep an eye on my father, and if there were more such episodes would have him evaluated. But one single odd occurrence of this type does not a disease make.