The Study
Index of cardiac electrophysiological balance in patients with vasovagal syncope confirmed by head-up tilt test
This study looked at people who already had fainting spells and compared their heart patterns to people who didn't faint. It found a difference in a heart measurement called ICEB, but it didn't make anyone faint or change anything — so we can't say ICEB causes fainting, only that it's linked to it.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
When people faint from standing too long, their heart’s electrical balance may be off even before they stand — like a seesaw that’s already tilted down on one side.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 544 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — this suggests fainting isn’t just a sudden reaction, but may be linked to a long-term imbalance in the nervous system controlling the heart.
- 2People who faint had shorter heart repolarization time (QT) and lower ICEB (3.96 vs.
- 34.28) than healthy people.
- 4Those with the most severe fainting (Type 2) had the lowest ICEB.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Frontiers in Cardiovascular Medicine
Year
2026
Authors
Lifei Tian, Hong-shuai Hou, Le Zhang, Yan Gao
Related Content
Claims (6)
In people without structural heart disease, heart palpitations occur due to an imbalance between the nervous system pathways that speed up and slow down the heart.
People diagnosed with vasovagal syncope through head-up tilt testing show measurably lower values of cardiac electrophysiological balance markers compared to healthy individuals, even when accounting for age, sex, and blood pressure.
In patients with vasovagal syncope, those with the Type 2 subtype have measurably lower baseline ICEB and ICEBc values than those with Type 1 or Type 3 subtypes, reflecting a more pronounced electrophysiological imbalance.
In patients with Type 2 vasovagal syncope, the amount of ICEB shortening during head-up tilt testing does not relate to how long the heart stops beating, and baseline ICEB levels reflect long-term autonomic nervous system function rather than the intensity of the immediate fainting response.
People who experience vasovagal syncope have a measurably lower Index of Cardiac Electrophysiological Balance than healthy individuals, even when accounting for age, sex, and blood pressure.
People with vasovagal syncope have shorter QT and corrected QT intervals on their electrocardiograms than healthy individuals, but the QRS duration is the same, showing that the change is due to faster repolarization rather than altered depolarization.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.