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Differentiation of subgroups of monosymptomatic enuresis according to prepulse inhibition of the startle reflex

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Abstract

Aim:  Monosymptomatic enuresis (ME) is a common disorder in children with serious social and psychological consequences. Treatment is usually initiated with desamino‐arginine vasopressin (dDAVP) and/or alarm therapy as first‐line treatment and imipramine as second‐line. All treatments have proven efficacy, but are not successful with all patients. Therefore, a differentiation into subgroups according to treatment efficacy would be beneficial.

Methods:  A group of patients resistant to first‐line treatment was treated with imipramine and compared with matched controls successfully treated with dDAVP and/or alarm therapy. Prepulse inhibition (PPI) to acoustic startle reflexes was measured in all patients.

Results:  In a group of 23 nonresponders, the median PPI was 72% (range 43–94%) compared with the matched dDAVP/alarm – responders with a median PPI of 26% (range 0–61%) (p < 0.0001). The response rate to imipramine was 87%.

Conclusion:  The presented data provide evidence that PPI allows to identify two subgroups of ME. The results offer further insight into (at least) two different pathomechanisms involved in ME: (i) a maturational delay of reflex inhibition with reduced PPI and (ii) a normal PPI, possibly with abnormal sleep patterns, that can be influenced by imipramine.
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Document Type: Research Article

Affiliations: Department of Pediatrics, University Clinics of Schleswig-Holstein, Kiel, Germany

Publication date: 2012-07-01

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