Hi,
Welcome to HealthCareMagic.com I am Dr.J.Mariano Anto Bruno Mascarenhas. I have gone through your query with diligence and would like you to know that I am here to help you.
1.
When there is increased alcohol level in blood, we have to assume this to be the cause of diminished cognitive abilities.
2.
Alcohol Levels can be high even if he is not "consuming alcohol" directly, but takes some substances (eg
Cough Syrup, Pain Killers) which have high alcohol content
So
He need not be lying
3
Coming to your question "Could this elevated level have anything to do with the dementia?", the answer is YES
Hope you found the answer helpful.
If you need any clarification / have doubts / have additional questions / have follow up questions, then please do not hesitate in asking again. I will be happy to answer your questions.
In the future, for continuity of care, I encourage you to contact me directly in HealthCareMagic at http://bit.ly/askdrbruno
Best Wishes for Speedy Recovery
Let me know if I can assist you further.
Take care.