Arch Dis Child 2001;85:29-37 ( July )

Article

Characterisation of breathing and associated central autonomic dysfunction in the Rett disorder P O O Julu^a, A M Kerr^b, F Apartopoulos^c, S Al-Rawas^a, I Witt Engerström^d, L Engerström^d, G A Jamal^a, S Hansen^c

^a Peripheral Nerve and Autonomic Unit, Department of Neurology, Imperial College of Science, Technology and Medicine, Central Middlesex Hospital, Acton Lane, London NW10 7NS, UK, ^b Department of Psychological Medicine, University of Glasgow, Gartnavel Royal Hospital, Glasgow, UK, ^c Departments of Neurophysiology and Clinical Physics, Institute of Neurological Sciences, South Glasgow University Hospitals NHS Trust, Glasgow, UK, ^d Rett Centre, Frösö Strand, Östersund Hospital, Sweden

Correspondence to: Dr Julu email: julu{at}udcf.gla.ac.uk

Accepted 15 January 2001

AIMTo investigate breathing rhythm and brain stem autonomic control in patients with Rett disorder.
SETTINGTwo university teaching hospitals in the United Kingdom and the Rett Centre, Sweden.
PATIENTS56 female patients with Rett disorder, aged 2-35 years; 11 controls aged 5-28 years.
DESIGNOne hour recordings of breathing movement, blood pressure, ECG R-R interval, heart rate, transcutaneous blood gases, cardiac vagal tone, and cardiac sensitivity to baroreflex measured on-line with synchronous EEG and video. Breathing rhythms were analysed in 47 cases.
RESULTSRespiratory rhythm was normal during sleep and abnormal in the waking state. Forced and apneustic breathing were prominent among 5-10 year olds, and Valsalva breathing in the over 18 year olds, who were also most likely to breathe normally. Inadequate breathing peaked among 10-18 year olds. Inadequate and exaggerated breathing was associated with vacant spells. Resting cardiac vagal tone and cardiac sensitivity to baroreflex were reduced.
CONCLUSIONSLabile respiratory rhythms and poor integrative inhibition in Rett disorder suggest brain immaturity. Linking this to an early monoaminergic defect suggests possible targets for the MECP2 gene in clinical intervention. Exaggerated and inadequate autonomic responses may contribute to sudden death.


Keywords: Rett disorder; autonomic system; brain stem; dysautonomia

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© 2001 by Archives of Disease in Childhood
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