E2 ModerateModerate confidencePEM not requiredCross-SectionalPeer-reviewedMachine draft
Hyperventilation and amplified blood pressure response: is there a link?
Naschitz, J E, Mussafia-Priselac, R, Peck, E R et al. · Journal of human hypertension · 2005 · DOI
Quick Summary
This study looked at whether rapid, shallow breathing (hyperventilation) causes blood pressure to rise when people change position, such as standing up. Researchers tested 320 patients with various conditions including ME/CFS using a tilt table test while measuring breathing CO2 levels. They found that hyperventilation during the test did not lead to higher blood pressure increases, suggesting that rapid breathing may not be the cause of blood pressure problems in these patient groups.
Why It Matters
Many ME/CFS patients experience orthostatic intolerance and abnormal blood pressure responses to position changes. This study addresses whether hyperventilation—a breathing pattern some patients exhibit—drives these cardiovascular symptoms, which could have implications for treatment approaches.
Observed Findings
- Among 320 patients, 30 exhibited postural hypertension with mean DBP increase of +9.9 mmHg; only 3 of these 30 also had hyperventilation.
- 56 of 290 patients without postural hypertension had hyperventilation, with mean DBP change of −0.3 mmHg.
- 234 patients without hyperventilation had mean DBP change of +0.95 mmHg, statistically similar to the hyperventilating group.
- Postural hypertension and hyperventilation showed minimal co-occurrence in the sample.
Inferred Conclusions
- Posturally induced hyperventilation is not associated with blood pressure increases during head-up tilt testing.
- Postural hypertension occurs independently of hyperventilation in this patient population, suggesting distinct underlying mechanisms.
- Hyperventilation is unlikely to be a primary driver of blood pressure dysregulation in these clinical conditions.
Remaining Questions
- Does hyperventilation play a role in blood pressure dysregulation in ME/CFS patients specifically, given the small number of CFS patients with concurrent hyperventilation in this cohort?
- What mechanisms do cause postural hypertension in the 30 patients who exhibited it without hyperventilation?
- Do different breathing patterns or CO2 thresholds correlate with cardiovascular symptoms in ME/CFS?
What This Study Does Not Prove
This study does not prove that hyperventilation never affects blood pressure in ME/CFS patients specifically, as the cohort was mixed and hyperventilation cases were few. It also does not establish causation in any direction, only correlation (or lack thereof). The findings may not apply to patients with more severe ME/CFS or different demographic characteristics.
Tags
Symptom:Orthostatic IntoleranceFatigue
Biomarker:Blood Biomarker
Method Flag:PEM Not DefinedWeak Case DefinitionMixed Cohort
Metadata
- DOI
- 10.1038/sj.jhh.1001830
- PMID
- 15838538
- Review status
- Machine draft
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 8 April 2026
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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