Tilt table evaluation for control pediatric patients: comparison with symptomatic patients

Area of Science:

• Pediatrics
• Cardiology
• Autonomic Function Testing

Background:

• Neurocardiogenic syncope is a common cause of recurrent syncope in children.
• Head-up tilt (HUT) testing is a primary diagnostic tool for neurocardiogenic syncope.
• Understanding control patient responses during HUT is crucial for accurate diagnosis.

Purpose of the Study:

• To evaluate head-up tilt (HUT) responses in pediatric control patients.
• To compare HUT results between pediatric control and symptomatic neurocardiogenic syncope patients.
• To assess the impact of repeated HUT and isoproterenol on control patient responses.

Main Methods:

• Twenty-three pediatric control patients underwent up to three drug-free head-up tilt (HUT) tests at an 80-degree angle.
• A subset of control patients received isoproterenol during the third HUT (cHUT-3).
• Control group HUT data were compared with 66 symptomatic patients who underwent similar drug-free (sHUT-1) and isoproterenol-augmented (sHUT-2) HUT protocols.

Main Results:

• 52% of pediatric control patients exhibited symptomatic responses during the initial drug-free HUT (cHUT-1).
• A significant proportion of control patients (52%) showed positive HUT responses, with some becoming positive on repeat testing.
• In comparison, 77% of symptomatic patients were classified as "true positives" after drug-free and isoproterenol-augmented HUT.

Conclusions:

• A substantial percentage of healthy pediatric control patients can exhibit positive HUT responses, potentially mimicking syncope.
• Repeated HUT testing may increase the likelihood of positive responses in control subjects.
• These findings underscore the importance of careful interpretation of HUT results in pediatric syncope evaluations.