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Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
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Tilt testing potentiated with sublingual nitroglycerin in children with unexplained syncope.

Giovanni Foglia-Manzillo1, Franco Giada, Nadia Fteita

  • 1Cardiology Department, Ospedale Valduce, Via Dane, 11, 22100 Como, Italy. gfoglia@valduce.it

European Heart Journal
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Summary

Sublingual nitroglycerin (NTG) enhanced head-up tilt (HUT) testing effectively diagnosed unexplained syncope in children. This NTG challenge significantly improved diagnostic rates while maintaining good specificity, proving safe for pediatric patients.

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Area of Science:

  • Pediatric Cardiology
  • Autonomic Nervous System Disorders
  • Diagnostic Testing

Background:

  • Unexplained syncope is a common reason for pediatric emergency department visits.
  • Accurate diagnosis is crucial for appropriate management and to rule out serious cardiac conditions.
  • Traditional head-up tilt (HUT) testing has limitations in diagnosing neurally mediated syncope in children.

Purpose of the Study:

  • To evaluate the diagnostic utility of a head-up tilt (HUT) testing protocol potentiated by sublingual nitroglycerin (NTG) in pediatric patients presenting with unexplained syncope.
  • To assess the safety and effectiveness of this enhanced diagnostic approach.

Main Methods:

  • A prospective study involving 164 children with unexplained syncope and 29 controls.
  • Participants underwent a 60-degree head-up tilt test.
  • Sublingual nitroglycerin (400 mcg) was administered if no symptoms occurred during the initial drug-free phase.

Main Results:

  • The sublingual NTG-potentiated HUT test yielded a positive response in 63% of pediatric patients.
  • Specificity was determined to be 86%.
  • The NTG challenge increased the positive rate by 55% compared to the drug-free phase, with minimal impact on specificity.

Conclusions:

  • Sublingual nitroglycerin-potentiated HUT testing is an effective and safe method for diagnosing neurally mediated syncope in children.
  • The NTG challenge significantly enhances the diagnostic yield of passive tilt testing.
  • This protocol aids in identifying the cause of unexplained syncope in pediatric populations.