RESUMO
BACKGROUND & AIMS: Congenital central hypoventilation syndrome, an unexplained disorder of the central control of breathing that may reflect widespread dysfunction of brainstem structures, is regarded as a form of neuro cristopathy. Because swallowing-induced peristalsis is centrally controlled and depends on neural crest-derived esophageal innervation, we looked for esophageal dysmotility in patients with congenital central hypoventilation syndrome. METHODS: Seven patients without dysphagia or any other upper gastrointestinal tract symptoms were studied prospectively (5 girls and 2 boys; median age, 14 years; range, 11-18 years). They were compared with 7 age- and sex-matched controls. Esophageal manometry was performed using a low-compliance infusion system and the station pull-through technique. At least 10 wet swallows were analyzed in each subject. RESULTS: Pressure wave propagation was abnormal in all 7 patients (median percentage of swallows propagated, 18%, and range, 0-66; controls, 90% and 80-100; P < 0.001). Lower esophageal sphincter relaxation was abnormal in 5 patients (patients, 73% and 53-100; controls, 95% and 90-100; P = 0.01). In 2 patients, lower esophageal sphincter pressure was above the 95th percentile of control values. CONCLUSIONS: These abnormalities are strong evidence of lower esophageal dysfunction in congenital central hypoventilation syndrome. We speculate that the underlying mechanism may be dysfunction of the central structures that control swallowing.
