Key result
Shortened head-up tilt test retains ~82% of positive responses in pediatric vasovagal syncope.
Why the study?
Does a shortened staged head-up tilt test protocol (20-min BHUT + 10-min SNHUT) retain diagnostic positivity compared to conventional protocols in pediatric patients with vasovagal syncope?
Cohort (n=345)
Does a shortened staged head-up tilt test protocol (20-min BHUT + 10-min SNHUT) retain diagnostic positivity compared to conventional protocols in pediatric patients with vasovagal syncope?
A shortened 30-minute staged head-up tilt test protocol (20-min baseline + 10-min nitroglycerin-potentiated phase) captures over 82% of positive diagnostic responses in pediatric vasovagal syncope, potentially reducing procedural burden pending prospective validation.
Answers are grounded in this paper and cite their sources.
May reduce procedural burden in pediatric syncope evaluation; leaves open prospective validation before adoption.
Background The head-up tilt test (HUTT) is a primary diagnostic method for vasovagal syncope (VVS) in pediatric patients, yet conventional protocols are lengthy and may impose a substantial procedural burden on children and adolescents. Accordingly, this study aimed to characterize phase-specific time-to-positivity patterns and to identify candidate shortened protocol of each HUTT phase for future prospective validation. Methods Between November 2023 and March 2025, 511 pediatric patients underwent HUTT. After excluding non-VVS cases and incomplete tests, 345 patients were included. Data on the baseline head-up tilt phase (BHUT) initiation to first positive response were collected. Temporal changes in diagnostic yield were analyzed using Kaplan-Meier analysis and tracking new positive cases in 5-min intervals. Bootstrap resampling was used to assess the internal stability of phase-specific thresholds and projected retention estimates. Results A total of 345 patients (aged 11.5 ± 2.5 years; 39.4% boys) were included, with 266 patients undergoing the sublingual nitroglycerin-potentiated head-up tilt (SNHUT). Among them, 87.0% tested positive, with 22.9% during BHUT and 64.1% during SNHUT. Positive results during BHUT occurred around 15.6 min (IQR 10.5-20.9), mainly within 10-20 min. In SNHUT, positive results appeared faster, around 6.3 min (IQR 4.7-7.7), mostly within the first two 5-min windows. The candidate BHUT 20-min + SNHUT 10-min protocol was projected to retain 82.3% of the observed positive responses (95% CI 77.7%-86.3%). Conclusions Positive responses to HUTT in children and adolescents are most frequent within the first 20 min post-tilt and the initial 10 min during SNHUT. A shortened protocol (20-min BHUT + 10-min SNHUT) may serve as a potential candidate based on retrospective truncation analysis, yet prospective validation remains mandatory prior to clinical adoption.
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Wang et al. (2026) conducted a cohort in Pediatric vasovagal syncope (n=345). Shortened staged head-up tilt test protocol (20-min BHUT + 10-min SNHUT) vs. Full-length observed head-up tilt test protocol was evaluated on Projected retention of observed positive HUTT responses (95% CI 77.7%-86.3%). A shortened 20-min baseline plus 10-min nitroglycerin-potentiated head-up tilt protocol was projected to retain 82.3% (95% CI 77.7%-86.3%) of positive responses in pediatric vasovagal syncope.
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