Could a breath of CO2 stop fainting spells?

This study looks at whether breathing air with a little extra carbon dioxide can help people with neurogenic orthostatic hypotension (NOH) — a condition where blood pressure drops sharply upon standing, causing dizziness and fainting. Researchers will test this in 80 adults (patients and healthy volunteers) at the University of Calgary. The goal is to see if this simple breathing method can raise blood pressure and improve blood flow to the brain.