Résumé
Objectif
Plusieurs études suggèrent un dysfonctionnement du système nerveux autonome (SNA) dans le syndrome clinique d’hyperactivité vésicale idiopathique (SCHV). L’étude de la variabilité de la fréquence cardiaque instantanée (VFc) est une méthode de mesure, non invasive et validée, de l’activité du SNA. Nous avons donc appliqué cette méthode au cours du remplissage vésical dans une population témoin (femmes présentant une incontinence urinaire d’effort pure:IUE) et à des patientes présentant un SCHV idiopathique.
Matériel et méthodes
Sept patientes IUE pure et trois patientes SCHV idiopathique ont été étudiées. L’enregistrement électrocardiographique a été réalisé sur dix minutes au repos, vessie vide, puis au cours du remplissage vésical en cystomanométrie. La VFc est étudiée par des indices fréquentiels: composés de basses fréquences, qui reflètent principalement la modulation sympathique, et de hautes fréquences, qui sont liées au système parasympathique.
Résultats et conclusion
Dans le groupe témoin, nous n’avons observé aucune modification significative des paramètres de la VFc lors du remplissage. En revanche, dans le groupe SCHV, le contrôle neurovégétatif cardiaque est différent des témoins et varie lors du remplissage, passant d’une hypertonie parasympathique vessie vide à une hypertonie sympathique en fin de remplissage. En fin de remplissage, au moment même où la continence vésicale est assurée par le sympathique, nous observons une élévation significative du tonus sympathique (p = 0,001), associée à une baisse du tonus parasympathique cardiaque (p < 0,0001). Ces résultats évoquent un dysfonctionnement de la balance végétative dans le SCHV.
Abstract
Objective
Several studies have suggested a defective automatic nervous system (ANS) in idiopathic vesical hyperactivity syndrome. The study of heart rate variability (HRV) is a non-invasive and validated method for measuring ANS activity. We therefore used this method for vesical filling in a control population (women with stress urinary incontinence: SUI) and in female patients with idiopathic vesical hyperactivity syndrome.
Materials and methods
We included 7 women with pure SUI and 3 with idiopathic vesical hyperactivity syndrome. Continuous ECG recording was performed over 10 minutes with an empty bladder and during artificial bladder filling. Heart rate variations were measured by frequential indices: low frequency, which mainly reflected sympathetic modulation, and high frequency, which is related to the parasympathetic system.
Results
In the control group, no significant changes in heart rate variations during filling were noted. However, in the idiopathic vesical hyperactivity group, cardiac neurovegetative control was different from the control group, and varied during filling, going from empty bladder parasympathetic hypertonia to sympathetic hypertonia at the end of filling. At the end of filling, when vesical continence is ensured by the sympathetic system, we noted a significant increase in sympathetic tone (P = 0.001), associated with a reduction in cardiac parasympathetic tone (P < 0.0001). These results demonstrate vegetative balance dysfunction in idiopathic vesical hyperactivity syndrome.
Conclusion
This preliminary study demonstrates a predominance of parasympathetic activity with an empty bladder and a predominance of sympathetic activity at the end of bladder filling in OAB. The results suggest a defective autonomic nervous system with idiopathic OAB. Further studies in a larger OAB population compared with normal urinary-symptom free patients are necessary to confirm this hypothesis.
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Hubeaux, K., Deffieux, X., Ismael, S.S. et al. Étude du système nerveux autonome par la variabilité de la fréquence cardiaque dans le syndrome clinique d’hyperactivité vésicale idiopathique. Pelv Perineol 2, 295–300 (2007). https://doi.org/10.1007/s11608-007-0162-9
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DOI: https://doi.org/10.1007/s11608-007-0162-9
Mots clés
- Système nerveux autonome
- Rythme cardiaque
- Vessie
- Incontinence urinaire chez la femme
- Syndrome clinique d’hyperactivité vésicale