Hormonal
Intermittent hypoxia (IH) characteristic of obstructive sleep apnea causes hypertension by dysregulating Hypoxia-Inducible Factors (HIF-1α and HIF-2α), which increases reactive oxygen species (ROS) to activate the sympathetic nervous system and impair baroreflex function.
If you have sleep apnea, the repeated drops in oxygen during sleep trigger a chemical response (HIF/ROS) that keeps your nervous system in 'fight or flight' mode, raising blood pressure even when you are awake. Treating the apnea (e.g., with CPAP) is critical, but because this chemical signaling can persist or cause vascular remodeling, blood pressure may not return to normal without additional targeted interventions. Managing OSA is not just about breathing; it is about stopping the chemical signal that drives hypertension.
IH increases HIF-1α and decreases HIF-2α protein levels. Dysregulated HIFs increase reactive oxygen species (ROS) through HIF-1–dependent activation of pro-oxidant enzyme genes in addition to reduced transcription of antioxidant genes by HIF-2. ROS in turn activate chemoreflex and suppress baroreflex, thereby stimulating the sympathetic nervous system and causing hypertension.
Why this rating
Strong evidence from multiple rodent models and human observational studies, though direct causal proof in humans is limited by ethical constraints on inducing IH.
Source
Hypoxia-inducible factors and obstructive sleep apnea
Nanduri R. Prabhakar et al. · Journal of Clinical Investigation · 2020
DOI 10.1172/jci137560
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