Orthostatic cardiovascular regulation during hypoxia and hyperoxia in patients with juvenile hypertension.

10 patients with juvenile hypertension were investigated during normoxia, hypoxia and hyperoxia in comparison to 10 healthy volunteers. The results of heart rate, stroke volume, cardiac output and blood pressure in supine position as well as in passive orthostasis are significantly different in both groups. It seems that in the initial phase of hypertension the arterial chemoreceptors might be on an enhanced functional state.