What is the clinical evidence from this study?

Study design: Systematic Review. Population: Obstructive sleep apnea (OSA). Intervention: Nocturnal hypoxemia parameters (e.g., ODI, SpO2, T90%, hypoxic burden). Primary outcome: Elevated blood pressure as measured by ambulatory blood pressure monitoring (ABPM).

What does this research mean for the field?

In adults with obstructive sleep apnea, the 3% oxygen desaturation index (ODI3%) is the most consistent nocturnal hypoxemia parameter associated with elevated blood pressure, whereas other indices yield highly variable results. Novelty: ClaimNovelty.SYNTHESIS. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

This review evaluates the relationship between nocturnal hypoxemia parameters and elevated blood pressure in adults with obstructive sleep apnea.

July 5, 2026Open Access

Which nocturnal hypoxemia parameters are associated with ambulatory blood pressure monitoring in adults with obstructive sleep apnea? A systematic review

Key Result

Across 24 studies of adults with obstructive sleep apnea, the 3% oxygen desaturation index (ODI3%) showed the most consistent association with increased ambulatory blood pressure.

Key Points

This review evaluates the relationship between nocturnal hypoxemia parameters and elevated blood pressure in adults with obstructive sleep apnea.
Systematic literature search across PubMed, Web of Science, Scopus, and Embase until June 2025.
24 studies met inclusion criteria examining various hypoxemia indices and their relation to blood pressure.
ODI3% consistently associated with increased blood pressure across studies.
Minimum SpO2, mean SpO2, and T90% showed variable associations with blood pressure.
Hypoxic burden evaluated in one study indicates potential role in blood pressure reduction but needs further investigation.

Study Design

Type

Systematic Review

Structured PICO

Which nocturnal hypoxemia parameters are most consistently associated with elevated ambulatory blood pressure in adults with obstructive sleep apnea?

Population

Systematic review of 24 studies evaluating the association between nocturnal desaturation parameters and elevated blood pressure measured by ABPM in adults with obstructive sleep apnea.

Exposure

Nocturnal hypoxemia parameters (oxygen desaturation index [ODI], mean and minimum oxygen saturation [SpO2], percentage of sleep time with peripheral oxygen saturation < 90% [T90%], hypoxic burden [HB])

Outcome

Elevated blood pressure as measured by ambulatory blood pressure monitoring (ABPM)surrogate

In adults with obstructive sleep apnea, the 3% oxygen desaturation index (ODI3%) is the nocturnal hypoxemia parameter most consistently associated with elevated ambulatory blood pressure.

Limitations

Heterogeneous results across studies
Evidence regarding hypoxic burden remains preliminary and warrants further investigation

Abstract

Abstract Objective Systemic arterial hypertension affects up to 50% of patients with obstructive sleep apnea (OSA) and represents one of the main modifiable cardiovascular risk factors. Hypoxemia is a recognized marker of OSA severity; however, it remains unclear which specific desaturation parameters during sleep, such as oxygen desaturation index (ODI), mean and minimum oxygen saturation (SpO 2 ), percentage of sleep time with peripheral oxygen saturation < 90% (T90%) or hypoxic burden (HB) are most consistently associated with elevated blood pressure (BP). This systematic review aims to evaluate, in patients with OSA, the impact between nocturnal desaturation parameters and elevated BP as measured by ambulatory blood pressure monitoring (ABPM). Methods A literature search was performed in PubMed, Web of Science, Scopus and Embase databases, covering all records available up to June 2025. Results A total of 5,587 records were identified through database searches, and 24 studies met the inclusion criteria. The studies revealed heterogeneous results, with some showing significant associations between hypoxemia indices and hypertension, while others did not. Evidence suggests that ODI3% is commonly related to increased BP, whereas minimum SpO 2 , mean SpO 2 and T90% yielded variable findings. HB was evaluated in only one study, suggesting a potential role in BP reduction after CPAP; however, the available evidence remains preliminary. Conclusion ODI3% showed the most consistent association with increased BP across studies, whereas other hypoxemia indices yielded more variable results. Evidence regarding HB remains preliminary and warrants further investigation. These findings suggest that although ODI currently appears to be the most reliable marker, evidence from a single study indicates that composite indices such as HB may represent more informative predictors of BP outcomes and deserve further investigation in future studies.

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