My 64 yo brother -in-law has recently experienced brief periods of blackouts. It begins with an urge to cough, then he begins to grunt, face turns red and blue lips, and about 20 seconds later he regains consciousness and acts as if nothing happened. He wonders why we re gathered around him. This is not a full blown grand mal seizure and he remains sitting the entire time. The hospital staff diagnosed him as having CHF, but I don t know if this could create sufficient hypoxia to cause this symptom. Any ideas?