Comorbidity of Neurally Mediated Syncope and Allergic Disease in Children

Area of Science:

• Pediatric Cardiology
• Allergy and Immunology
• Autonomic Nervous System Research

Background:

• Neurally mediated syncope (NMS), encompassing vasovagal syncope (VVS), postural tachycardia syndrome (POTS), and situational syncope, is common in children.
• Allergic diseases are highly prevalent in pediatric populations across various systems.
• Growing evidence suggests a significant comorbidity between NMS and allergic diseases in children.

Purpose of the Study:

• To review the clinical manifestations and pathogenesis of NMS and allergic disease comorbidity in children.
• To highlight the prevalence and unique clinical features of this combined condition.
• To explore potential underlying mechanisms linking NMS and allergies.

Main Methods:

• Literature review of clinical studies on pediatric syncope and allergic diseases.
• Analysis of reported comorbidity rates and clinical characteristics.
• Examination of proposed etiological factors and regulatory pathways.

Main Results:

• Approximately 30-40% of children with VVS and/or POTS have coexisting allergic diseases.
• Children with this comorbidity exhibit distinct clinical presentations.
• Potential contributing factors include autonomic nervous system (ANS) dysfunction, vasoactive element imbalance, and autoimmunity.
• A strong association exists between asthma and cough syncope, a type of situational syncope.

Conclusions:

• The comorbidity of NMS and allergic diseases is a significant concern in pediatric patients.
• Autonomic dysfunction, allergic responses, and autoimmunity are implicated in the pathogenesis.
• Further research is essential for improved diagnosis and therapeutic strategies for affected children.