Conversation: The conversation between human and AI assistant.
[|Human|] My husband has had w/u for sx of lightheadedness and ongoing fatigue.  Has had 2 sleep studies  and uses CPAP, sleeps 7-8 hous/night, had sinus surgery 2.5 years ago and has been sinus infection free since....but continues to c/o lightheadedness and fatigue throughout the day.  He is taking Benadryl each night as a sleep aide and to help with allergies.  Also takes Lipitor and Valtrex.
[|AI|]  Thanks for your question on Chat Doctor. I can understand your concern. Since your husband is having sleep apnea and using CPAP daily, we should rule out carbon dioxide retention as a cause for these symptoms. Lightheadedness, easy navigability etc. are commonly seen with CO2 retention in patients with CPAP. So consult your doctor and get done arterial blood gas (ABG) analysis. He may need titration of CPAP if CO2 is high. Hope I have solved your query. I will be happy to help you further. Wishing good health to your husband. Thanks.