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A simple deep breathing test reveals altered cerebral autoregulation in type 2 diabetic patients

  • Brown, Clive M. Department of Neurology, University of Erlangen-Nuremberg, Germany - Department of Medicine, Division of Physiology, University of Fribourg, Switzerland
  • Marthol, H. Department of Neurology, University of Erlangen-Nuremberg, Germany
  • Zikeli, Udo Department of Neurology, University of Erlangen-Nuremberg, Germany
  • Ziegler, D. Institute for Clinical Diabetes Research, German Diabetes Center, Leibniz Center at the Heinrich Heine University, Düsseldorf, Germany
  • Hilz, M. J. Department of Neurology, University of Erlangen-Nuremberg, Germany - Departments of Neurology, Medicine and Psychiatry, New York University School of Medicine, New York, USA
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    29.02.2008
Published in:
  • Diabetologia. - 2008, vol. 51, no. 5, p. 756-761
Autonomic nervous system
blood pressure regulation
cerebral autoregulation
diabetes
heart rate variability
English Aims/hypothesis Patients with diabetes mellitus have an increased risk of stroke and other cerebrovascular complications. The purpose of this study was to evaluate the autoregulation of cerebral blood flow in diabetic patients using a simple method that could easily be applied to the clinical routine screening of diabetic patients.Methods We studied ten patients with type 2 diabetes mellitus and 11 healthy volunteer control participants. Continuous and non-invasive measurements of blood pressure and cerebral blood flow velocity were performed during deep breathing at 0.1 Hz (six breaths per minute). Cerebral autoregulation was assessed from the phase shift angle between breathing-induced 0.1 Hz oscillations in mean blood pressure and cerebral blood flow velocity.Results The controls and patients all showed positive phase shift angles between breathing-induced 0.1 Hz blood pressure and cerebral blood flow velocity oscillations. However, the phase shift angle was significantly reduced (p < 0.05) in the patients (48 ± 9°) compared with the controls (80 ± 12°). The gain between 0.1 Hz oscillations in blood pressure and cerebral blood flow velocity did not differ significantly between the patients and controls.Conclusions/interpretation The reduced phase shift angle between oscillations in mean blood pressure and cerebral blood flow velocity during deep breathing suggests altered cerebral autoregulation in patients with diabetes and might contribute to an increased risk of cerebrovascular disorders.
Faculty
Faculté des sciences et de médecine
Department
Département de Médecine
Language
  • English
Classification
Pathology, clinical medicine
License
License undefined
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Persistent URL
https://folia.unifr.ch/unifr/documents/300676
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