Acceleration Index Predicts Efficacy of Orthostatic Training on Vasovagal Syncope in Children

Area of Science:

• Pediatric Cardiology
• Autonomic Nervous System Disorders

Background:

• Vasovagal syncope (VVS) is a common cause of syncope in children.
• Orthostatic training is a primary non-pharmacological treatment for VVS.
• Predicting therapeutic response is crucial for optimizing VVS management.

Purpose of the Study:

• To evaluate the acceleration index's utility in predicting treatment response to orthostatic training in pediatric VVS patients.
• To determine if the acceleration index can identify children likely to benefit from orthostatic training.

Main Methods:

• Thirty-three children diagnosed with VVS received 3 months of orthostatic training.
• The acceleration index was measured and correlated with VVS severity.
• Receiver operating characteristic (ROC) curve analysis assessed the predictive value of the acceleration index for treatment response.

Main Results:

• The acceleration index was significantly lower in responders (21.10 ± 6.61) versus non-responders (31.36 ± 9.00) (P=.001).
• A negative correlation was observed between the acceleration index and positive response time, systolic, and diastolic blood pressure during head-up tilt testing.
• The ROC curve analysis demonstrated good predictive capability (Area Under Curve = 0.827), with a cutoff of 26.77 yielding 85.0% sensitivity and 69.2% specificity.

Conclusions:

• The acceleration index shows promise as a predictor of therapeutic efficacy for orthostatic training in pediatric VVS.
• This index may aid clinicians in identifying children who will most likely respond positively to orthostatic training.