Earlier studies have shown that hyperventilation can in fact cause a fall of blood pressure and only a moderate increase of heart rate in subjects with autonomic failure. The amount of increase of heart rate during hyperventilation in autonomic failure depends upon the amount of vagal denervation.

What happens to blood pressure during hyperventilation?

Papers in the medical and psychiatric literature state that hyperventilation causes vasoconstriction and increases of blood pressure, even though a classic early study of the hemodynamic effects of voluntary hyperventilation concluded that hyperventilating for one minute lowered peripheral resistance by 45%, and mean ...

Why does hyperventilation cause low blood pressure?

In normal subjects hyperventilation causes a drop in arterial blood pressure, apparently because of the direct effect of hypocapnia on the peripheral vessels.