Effects of chronic baroreceptor stimulation on the autonomic cardiovascular regulation in patients with drug-resistant arterial hypertension

Wustmann, Kerstin; Kucera, Jan P; Scheffers, Ingrid; Mohaupt, Markus; Kroon, Abraham A; de Leeuw, Peter W; Schmidli, Jürg; Allemann, Yves; Delacrétaz, Etienne (2009). Effects of chronic baroreceptor stimulation on the autonomic cardiovascular regulation in patients with drug-resistant arterial hypertension. Hypertension, 54(3), pp. 530-6. Philadelphia, Pa.: Lippincott Williams & Wilkins 10.1161/HYPERTENSIONAHA.109.134023

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In patients with drug-resistant hypertension, chronic electric stimulation of the carotid baroreflex is an investigational therapy for blood pressure reduction. We hypothesized that changes in cardiac autonomic regulation can be demonstrated in response to chronic baroreceptor stimulation, and we analyzed the correlation with blood pressure changes. Twenty-one patients with drug-resistant hypertension were prospectively included in a substudy of the Device Based Therapy in Hypertension Trial. Heart rate variability and heart rate turbulence were analyzed using 24-hour ECG. Recordings were obtained 1 month after device implantation with the stimulator off and after 3 months of chronic electric stimulation (stimulator on). Chronic baroreceptor stimulation decreased office blood pressure from 185+/-31/109+/-24 mm Hg to 154+/-23/95+/-16 mm Hg (P<0.0001/P=0.002). Mean heart rate decreased from 81+/-11 to 76+/-10 beats per minute(-1) (P=0.001). Heart rate variability frequency-domain parameters assessed using fast Fourier transformation (FFT; ratio of low frequency:high frequency: 2.78 versus 2.24 for off versus on; P<0.001) were significantly changed during stimulation of the carotid baroreceptor, and heart rate turbulence onset was significantly decreased (turbulence onset: -0.002 versus -0.015 for off versus on; P=0.004). In conclusion, chronic baroreceptor stimulation causes sustained changes in heart rate variability and heart rate turbulence that are consistent with inhibition of sympathetic activity and increase of parasympathetic activity in patients with drug-resistant systemic hypertension; these changes correlate with blood pressure reduction. Whether the autonomic modulation has favorable cardiovascular effects beyond blood pressure control should be investigated in further studies.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Cardiovascular Disorders (DHGE) > Clinic of Cardiology 04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Physiology 04 Faculty of Medicine > Department of Dermatology, Urology, Rheumatology, Nephrology, Osteoporosis (DURN) > Clinic of Nephrology and Hypertension 04 Faculty of Medicine > Department of Cardiovascular Disorders (DHGE) > Clinic of Heart Surgery
UniBE Contributor:	Wustmann, Kerstin Brigitte, Kucera, Jan, Mohaupt, Markus, Schmidli, Jürg, Allemann, Yves, Delacrétaz, Etienne
ISSN:	0194-911X
ISBN:	19620513
Publisher:	Lippincott Williams & Wilkins
Language:	English
Submitter:	Markus Georg Mohaupt
Date Deposited:	04 Oct 2013 15:09
Last Modified:	27 Feb 2024 14:29
Publisher DOI:	10.1161/HYPERTENSIONAHA.109.134023
PubMed ID:	19620513
Web of Science ID:	000269089100022
URI:	https://boris.unibe.ch/id/eprint/30210 (FactScience: 191448)