1
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Heusser K, Tank J, Diedrich A, Fischer A, Heise T, Jordan J. Randomized Trial Comparing SGLT2 Inhibition and Hydrochlorothiazide on Sympathetic Traffic in Type 2 Diabetes. Kidney Int Rep 2023; 8:2254-2264. [PMID: 38025218 PMCID: PMC10658269 DOI: 10.1016/j.ekir.2023.08.036] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 08/24/2023] [Accepted: 08/28/2023] [Indexed: 12/01/2023] Open
Abstract
Introduction Reductions in sympathetic nervous system activity may contribute to beneficial effects of sodium glucose cotransporter 2 (SGLT2) inhibition on cardiovascular outcomes. Therefore, we tested the hypothesis that SGLT2 inhibition with empagliflozin (Empa) lowers muscle sympathetic nerve activity (MSNA) in patients with type 2 diabetes mellitus (T2DM) compared with hydrochlorothiazide (HCT) to discern SGLT2-specific actions from responses to increased natriuresis. Methods We randomized patients with T2DM on metformin monotherapy to either 25 mg/d Empa (n = 20) or 25 mg/d HCT (n = 21) for 6 weeks in a parallel, double-blind fashion. We assessed MSNA by peroneal microneurography, blood pressure, cardiovascular and metabolic biomarkers at baseline and at the end of treatment. Results Both drugs elicited volume depletion, as indicated by increased thoracic impedance. Compared with HCT, Empa caused 1.23 kg more body weight loss (P = 0.011) and improved glycemic control. Seated systolic blood pressure decreased with both treatments (P < 0.002). MSNA did not change significantly with either treatment; however, MSNA changes were negatively correlated with changes in body weight on Empa (P = 0.042) and on HCT(P = 0.001). The relationship was shifted to lower MSNA on Empa compared with HCT (P = 0.002). Conclusion Increased renal sodium excretion eliciting body weight loss may promote sympathetic activation. However, sympathetic excitation in the face of increased sodium loss may be attenuated by SGLT2 inhibitor-specific actions.
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Affiliation(s)
- Karsten Heusser
- Institute of Aerospace Medicine, German Aerospace Center, Cologne Germany
| | - Jens Tank
- Institute of Aerospace Medicine, German Aerospace Center, Cologne Germany
| | - André Diedrich
- Vanderbilt Autonomic Dysfunction Center, Division of Clinical Pharmacology, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA
- Department of Biomedical Engineering, School of Engineering, Vanderbilt University, Nashville, Tennessee, USA
| | | | | | - Jens Jordan
- Institute of Aerospace Medicine, German Aerospace Center, Cologne Germany
- Medical Faculty, University of Cologne, Cologne, Germany
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2
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Grassi G. Sympathetic modulation as a goal of antihypertensive treatment: from drugs to devices. J Hypertens 2023; 41:1688-1695. [PMID: 37602470 PMCID: PMC10552843 DOI: 10.1097/hjh.0000000000003538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 07/26/2023] [Accepted: 07/28/2023] [Indexed: 08/22/2023]
Abstract
The present study aims to examine the effects of nonpharmacological, pharmacological and devices-based treatment on hypertension-related sympathetic overactivity. This will be done by analyzing the results of different published studies, in which sympathetic activity has been assessed via indirect or direct techniques. After examining the rationale for sympathomodulatory interventions in antihypertensive treatment, the study will discuss the methodological intrinsic limitations of the studies aimed at assessing different therapeutic interventions. The core of the study will be then focused on the effects of nonpharmacological (dietary restriction of sodium intake, physical exercise training, weight reduction), pharmacological (monotherapy, combination drug treatment, new drugs such as sodium glucose co-transport protein-2 inhibitors and angiotensin receptor neprilysin inhibitors), as well as devices-based interventions (renal sympathetic nerves ablation and carotid baroreceptor activation therapy) on the hypertension-related sympathetic overdrive. Finally, the areas worthy of future research as well as the debated issues in the field will be highlighted.
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Affiliation(s)
- Guido Grassi
- Clinica Medica, Department of Medicine and Surgery, University of Milano-Bicocca, Milan, Italy
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3
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Hasegawa Y, Uchikawa H, Kajiwara S, Morioka M. Central sympathetic nerve activation in subarachnoid hemorrhage. J Neurochem 2021; 160:34-50. [PMID: 34525222 DOI: 10.1111/jnc.15511] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 09/04/2021] [Accepted: 09/07/2021] [Indexed: 12/12/2022]
Abstract
Subarachnoid hemorrhage (SAH) is a life-threatening condition, and although its two main complications-cerebral vasospasm (CVS)/delayed cerebral ischemia (DCI) and early brain injury (EBI)-have been widely studied, prognosis has not improved over time. The sympathetic nerve (SN) system is important for the regulation of cardiovascular function and is closely associated with cerebral vessels and the regulation of cerebral blood flow and cerebrovascular function; thus, excessive SN activation leads to a rapid breakdown of homeostasis in the brain. In the hyperacute phase, patients with SAH can experience possibly lethal conditions that are thought to be associated with SN activation (catecholamine surge)-related arrhythmia, neurogenic pulmonary edema, and irreversible injury to the hypothalamus and brainstem. Although the role of the SN system in SAH has long been investigated and considerable evidence has been collected, the exact pathophysiology remains undetermined, mainly because the relationships between the SN system and SAH are complicated, and many SN-modulating factors are involved. Thus, research concerning these relationships needs to explore novel findings that correlate with the relevant concepts based on past reliable evidence. Here, we explore the role of the central SN (CSN) system in SAH pathophysiology and provide a comprehensive review of the functional CSN network; brain injury in hyperacute phase involving the CSN system; pathophysiological overlap between the CSN system and the two major SAH complications, CVS/DCI and EBI; CSN-modulating factors; and SAH-related extracerebral organ injury. Further studies are warranted to determine the specific roles of the CSN system in the brain injuries associated with SAH.
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Affiliation(s)
- Yu Hasegawa
- Department of Pharmaceutical Science, School of Pharmacy at Fukuoka, International University of Health and Welfare, Okawa, Fukuoka, Japan.,Department of Neurosurgery, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Hiroki Uchikawa
- Department of Neurosurgery, Kumamoto University School of Medicine, Kumamoto, Kumamoto, Japan
| | - Sosho Kajiwara
- Department of Neurosurgery, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Motohiro Morioka
- Department of Neurosurgery, Kurume University School of Medicine, Kurume, Fukuoka, Japan
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4
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Takeda R, Stickford ASL, Best SA, Yoo JK, Hissen SL, Liu YL, Fu Q. Impact of high-salt versus low-salt intake on the response of sympathetic baroreflex sensitivity to orthostasis in women with a history of normal pregnancy. Am J Physiol Regul Integr Comp Physiol 2021; 321:R260-R270. [PMID: 34231375 DOI: 10.1152/ajpregu.00069.2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Previous studies have demonstrated that sympathetic baroreflex sensitivity (BRS) increases during orthostatic stress in humans. We recently showed that dietary salt intake affects sympathetic neural control in healthy premenopausal women. This study aimed to determine whether salt loading versus salt reduction would impact sympathetic BRS during orthostasis in premenopausal women with a history of normal pregnancy. Nine healthy women [42 ± 3 (SD) yr] were given a standardized isocaloric high-salt (250 mEq sodium/day) or low-salt (50 mEq sodium/day) diet for 1 wk each (∼2 mo apart with the order randomized), whereas water intake was ad libitum. Laboratory testing was performed following each high- and low-salt period in the midluteal phase of the menstrual cycle. Hemodynamics and muscle sympathetic nerve activity (MSNA) were measured at baseline (supine; 2 min) and during a graded head-up tilt (30° for 5 min and 60° for 20 min). Sympathetic BRS was assessed during baseline and head-up tilt. Hemodynamics were not different between salt conditions during baseline or tilt. Both supine and upright MSNA indices were lower in high salt than low salt (all P < 0.05), however, there was no interaction effect (P = 0.507-0.996). On moving from supine to upright, sympathetic BRS remained unchanged in high salt but increased in low salt (P = 0.028 for interaction). Thus, salt loading diminishes the responsiveness of sympathetic BRS during orthostasis compared with salt reduction in healthy premenopausal women with prior normal pregnancy. Whether this is one underlying mechanism for salt-induced development of hypertension during ambulation remains to be determined.
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Affiliation(s)
- Ryosuke Takeda
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas.,The University of Texas Southwestern Medical Center, Dallas, Texas
| | - Abigail S L Stickford
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas.,The University of Texas Southwestern Medical Center, Dallas, Texas
| | - Stuart A Best
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas.,The University of Texas Southwestern Medical Center, Dallas, Texas
| | - Jeung-Ki Yoo
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas.,The University of Texas Southwestern Medical Center, Dallas, Texas
| | - Sarah L Hissen
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas.,The University of Texas Southwestern Medical Center, Dallas, Texas
| | - Yu-Lun Liu
- The University of Texas Southwestern Medical Center, Dallas, Texas
| | - Qi Fu
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas.,The University of Texas Southwestern Medical Center, Dallas, Texas
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5
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The renin-angiotensin system in cardiovascular autonomic control: recent developments and clinical implications. Clin Auton Res 2018; 29:231-243. [PMID: 30413906 DOI: 10.1007/s10286-018-0572-5] [Citation(s) in RCA: 144] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2018] [Accepted: 10/25/2018] [Indexed: 10/27/2022]
Abstract
Complex and bidirectional interactions between the renin-angiotensin system (RAS) and autonomic nervous system have been well established for cardiovascular regulation under both physiological and pathophysiological conditions. Most research to date has focused on deleterious effects of components of the vasoconstrictor arm of the RAS on cardiovascular autonomic control, such as renin, angiotensin II, and aldosterone. The recent discovery of prorenin and the prorenin receptor have further increased our understanding of RAS interactions in autonomic brain regions. Therapies targeting these RAS components, such as angiotensin-converting enzyme (ACE) inhibitors and angiotensin receptor blockers, are commonly used for treatment of hypertension and cardiovascular diseases, with blood pressure-lowering effects attributed in part to sympathetic inhibition and parasympathetic facilitation. In addition, a vasodilatory arm of the RAS has emerged that includes angiotensin-(1-7), ACE2, and alamandine, and promotes beneficial effects on blood pressure in part by reducing sympathetic activity and improving arterial baroreceptor reflex function in animal models. The role of the vasodilatory arm of the RAS in cardiovascular autonomic regulation in clinical populations, however, has yet to be determined. This review will summarize recent developments in autonomic mechanisms involved in the effects of the RAS on cardiovascular regulation, with a focus on newly discovered pathways and therapeutic targets for this hormone system.
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6
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Okada Y, Shibata S, Fujimoto N, Best SA, Levine BD, Fu Q. Long-term effects of a renin inhibitor versus a thiazide diuretic on arterial stiffness and left ventricular diastolic function in elderly hypertensive patients. Am J Physiol Regul Integr Comp Physiol 2017; 313:R400-R409. [PMID: 28724547 DOI: 10.1152/ajpregu.00125.2017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Revised: 07/12/2017] [Accepted: 07/13/2017] [Indexed: 01/15/2023]
Abstract
Arterial stiffness and cardiac function are important predictors of cardiovascular events in patients with hypertension, even with adequate blood pressure (BP) control. We evaluated whether a direct renin inhibitor, aliskiren, reduces arterial stiffness and modulates left ventricular function compared with a diuretic, hydrochlorothiazide, in elderly hypertensive patients. Twenty-one hypertensive patients [67 ± 14 (SD) yr] were randomly assigned to receive 6-mo aliskiren (n = 11) or hydrochlorothiazide (n = 10)-based therapy. We assessed β-stiffness of the local arteries, arterial elastance (Ea), and echocardiographic variables, including early (E) and late (A) mitral inflow velocity, deceleration time of E, early (E') and late (A') diastolic mitral annular velocity, and left ventricular end-systolic elastance (Ees) before and after treatment. BP decreased similarly (P < 0.001) after both therapies. β-Stiffness of the carotid artery decreased after aliskiren but increased after hydrochlorothiazide treatment (aliskiren: 6.42 ± 2.34 pre vs. 5.07 ± 1.29 post; hydrochlorothiazide: 5.05 ± 1.78 vs. 7.25 ± 2.68, P = 0.001 for interaction). β-Stiffness of the femoral and radial arteries were not different after either treatment. Different from aliskiren, E decreased (73 ± 16 vs. 67 ± 14 cm/s, P = 0.026), and the deceleration time was prolonged (218 ± 40 vs. 236 ± 35 ms, P = 0.032) after hydrochlorothiazide therapy, whereas the E/A, and E' remained unchanged after both treatments. Ea and Ees decreased after aliskiren therapy (both P < 0.05), whereas the Ea/Ees (ventricular-arterial coupling) was maintained after both treatments. Thus, aliskiren decreased the stiffness of carotid artery and left ventricular end-systolic elastance with maintenance of ventricular-arterial coupling without any effects on diastolic filling, while hydrochlorothiazide increased carotid arterial stiffness and slowed early diastolic filling in elderly hypertensive patients.
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Affiliation(s)
- Yoshiyuki Okada
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas.,University of Texas Southwestern Medical Center, Dallas, Texas; and.,Department of Special Care Dentistry, Matsumoto Dental University, Nagano, Japan
| | - Shigeki Shibata
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas.,University of Texas Southwestern Medical Center, Dallas, Texas; and
| | - Naoki Fujimoto
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas.,University of Texas Southwestern Medical Center, Dallas, Texas; and
| | - Stuart A Best
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas.,University of Texas Southwestern Medical Center, Dallas, Texas; and
| | - Benjamin D Levine
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas.,University of Texas Southwestern Medical Center, Dallas, Texas; and
| | - Qi Fu
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas; .,University of Texas Southwestern Medical Center, Dallas, Texas; and
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7
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Howden EJ, East C, Lawley JS, Stickford AS, Verhees M, Fu Q, Levine BD. Integrative Blood Pressure Response to Upright Tilt Post Renal Denervation. Am J Hypertens 2017; 30:632-641. [PMID: 28338768 DOI: 10.1093/ajh/hpx018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Accepted: 02/03/2017] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Whether renal denervation (RDN) in patients with resistant hypertension normalizes blood pressure (BP) regulation in response to routine cardiovascular stimuli such as upright posture is unknown. We conducted an integrative study of BP regulation in patients with resistant hypertension who had received RDN to characterize autonomic circulatory control. METHODS Twelve patients (60 ± 9 [SD] years, n = 10 males) who participated in the Symplicity HTN-3 trial were studied and compared to 2 age-matched normotensive (Norm) and hypertensive (unmedicated, HTN) control groups. BP, heart rate (HR), cardiac output (Qc), muscle sympathetic nerve activity (MSNA), and neurohormonal variables were measured supine, and 30° (5 minutes) and 60° (20 minutes) head-up-tilt (HUT). Total peripheral resistance (TPR) was calculated from mean arterial pressure and Qc. RESULTS Despite treatment with RDN and 4.8 (range, 3-7) antihypertensive medications, the RDN had significantly higher supine systolic BP compared to Norm and HTN (149 ± 15 vs. 118 ± 6, 108 ± 8 mm Hg, P < 0.001). When supine, RDN had higher HR, TPR, MSNA, plasma norepinephrine, and effective arterial elastance compared to Norm. Plasma norepinephrine, Qc, and HR were also higher in the RDN vs. HTN. During HUT, BP remained higher in the RDN, due to increases in Qc, plasma norepinephrine, and aldosterone. CONCLUSION We provide evidence of a possible mechanism by which BP remains elevated post RDN, with the observation of increased Qc and arterial stiffness, as well as plasma norepinephrine and aldosterone levels at approximately 2 years post treatment. These findings may be the consequence of incomplete ablation of sympathetic renal nerves or be related to other factors.
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Affiliation(s)
- Erin J. Howden
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas, USA
- University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Cara East
- Baylor Soltero Cardiovascular Research Center, Baylor Scott and White Research Institute, Dallas, Texas, USA
| | - Justin S. Lawley
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas, USA
- University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Abigail S.L. Stickford
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas, USA
- University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Myrthe Verhees
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas, USA
| | - Qi Fu
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas, USA
- University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Benjamin D. Levine
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas, USA
- University of Texas Southwestern Medical Center, Dallas, Texas, USA
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Ott C, Lobo MD, Sobotka PA, Mahfoud F, Stanton A, Cockcroft J, Sulke N, Dolan E, van der Giet M, Hoyer J, Furniss SS, Foran JP, Witkowski A, Januszewicz A, Schoors D, Tsioufis K, Rensing BJ, Saxena M, Scott B, Ng GA, Achenbach S, Schmieder RE. Effect of Arteriovenous Anastomosis on Blood Pressure Reduction in Patients With Isolated Systolic Hypertension Compared With Combined Hypertension. J Am Heart Assoc 2016; 5:JAHA.116.004234. [PMID: 28003251 PMCID: PMC5210451 DOI: 10.1161/jaha.116.004234] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
Background Options for interventional therapy to lower blood pressure (BP) in patients with treatment‐resistant hypertension include renal denervation and the creation of an arteriovenous anastomosis using the ROX coupler. It has been shown that BP response after renal denervation is greater in patients with combined hypertension (CH) than in patients with isolated systolic hypertension (ISH). We analyzed the effect of ROX coupler implantation in patients with CH as compared with ISH. Methods and Results The randomized, controlled, prospective ROX Control Hypertension Study included patients with true treatment‐resistant hypertension (office systolic BP ≥140 mm Hg, average daytime ambulatory BP ≥135/85 mm Hg, and treatment with ≥3 antihypertensive drugs including a diuretic). In a post hoc analysis, we stratified patients with CH (n=31) and ISH (n=11). Baseline office systolic BP (177±18 mm Hg versus 169±17 mm Hg, P=0.163) and 24‐hour ambulatory systolic BP (159±16 mm Hg versus 154±11 mm Hg, P=0.463) did not differ between patients with CH and those with ISH. ROX coupler implementation resulted in a significant reduction in office systolic BP (CH: −29±21 mm Hg versus ISH: −22±31 mm Hg, P=0.445) and 24‐hour ambulatory systolic BP (CH: −14±20 mm Hg versus ISH: −13±15 mm Hg, P=0.672), without significant differences between the two groups. The responder rate (office systolic BP reduction ≥10 mm Hg) after 6 months was not different (CH: 81% versus ISH: 82%, P=0.932). Conclusions Our data suggest that creation of an arteriovenous anastomosis using the ROX coupler system leads to a similar reduction of office and 24‐hour ambulatory systolic BP in patients with combined and isolated systolic hypertension. Clinical Trial Registration URL: http://www.clinicaltrials.gov. Unique identifier: NCT01642498.
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Affiliation(s)
- Christian Ott
- Department of Nephrology and Hypertension, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Melvin D Lobo
- William Harvey Research Institute, Barts NIHR Cardiovascular Biomedical Research Unit, Queen Mary University of London, United Kingdom
| | | | - Felix Mahfoud
- Klinik für Innere Medizin III, Universitätsklinikum des Saarlandes, Homburg/Saar, Germany
| | - Alice Stanton
- Molecular and Cellular Therapeutics, Royal College of Surgeons in Ireland Medical School, Dublin, Ireland
| | - John Cockcroft
- Cardiolgy Department, Wales Heart Research Institute, Cardiff, United Kingdom
| | - Neil Sulke
- Cardiology Department, Eastbourne District General Hospital, East Sussex, United Kingdom
| | - Eamon Dolan
- Department of Medicine for the Elderly, Connolly Hospital, Dublin, Ireland
| | - Markus van der Giet
- Department of Endocrinology and Nephrology, Universitätsmedizin Berlin, Berlin, Germany
| | - Joachim Hoyer
- Department of Internal Medicine and Nephrology, Universitätsklinikum Gießen und Marburg GmbH, Marburg, Germany
| | - Stephen S Furniss
- Department of Cardiology, East Sussex Healthcare NHS Trust, East Sussex, United Kingdom
| | - John P Foran
- Cardiac Department, Royal Brompton Hospital, London, United Kingdom.,Cardiolgy Department, St. Helier Hospital, Surrey, United Kingdom
| | | | | | - Danny Schoors
- Department of Cardiology, Universitair Ziekenhuis Brussel, Brussels, Belgium
| | | | - Benno J Rensing
- Department of Cardiology, St. Antonius Ziekenhuis, Nieuwegein, the Netherlands
| | - Manish Saxena
- William Harvey Research Institute, Barts NIHR Cardiovascular Biomedical Research Unit, Queen Mary University of London, United Kingdom
| | - Benjamin Scott
- Department of Cardiology, ZNA - Cardio Middelheim, Antwerp, Belgium
| | - G André Ng
- Department of Cardiovascular Sciences, University of Leicester Glenfield Hospital/NIHR Leicester Cardiovascular Biomedical Research, Leicester, United Kingdom
| | - Stephan Achenbach
- Department of Cardiology, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Roland E Schmieder
- Department of Nephrology and Hypertension, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Erlangen, Germany
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9
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Grassi G. Sympathomodulatory Effects of Antihypertensive Drug Treatment. Am J Hypertens 2016; 29:665-75. [PMID: 26888777 DOI: 10.1093/ajh/hpw012] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 01/20/2016] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND An activation of sympathetic neural influences to the heart and peripheral circulation has been shown to represent a hallmark of the essential hypertensive state, adrenergic neural factors participating together with other variables at the development and progression of the high blood pressure state as well as of the hypertension-related target organ damage. This represents the rationale for employing in hypertension treatment drugs which combine the blood pressure-lowering properties with the modulatory effects on the sympathetic neural function. METHODS AND RESULTS Several studies published during the past 40 years have investigated the impact of antihypertensive drugs on the sympathetic target as assessed by indirect and direct approaches. In the present paper, the effects of different monotherapies or combination drug treatment used in hypertension to lower elevated blood pressure values on various adrenergic markers will be examined. This will be followed by a discussion of the (i) hemodynamic and nonhemodynamic consequences of employing antihypertensive drugs with sympathomodulatory or sympathoexcitatory properties and (ii) mechanisms potentially responsible for the adrenergic responses to a given antihypertensive drug. The final part of this review will address the questions still open related to the impact of antihypertensive drug treatment on sympathetic function. Two questions in particular will be examined, i.e., whether antihypertensive drugs with sympathomodulatory properties may be capable to fully restore a "normal" adrenergic drive and how far sympathetic activity should be reduced in hypertensive patients. CONCLUSION Future investigations aimed at answering these questions will be needed in order to improve cardiovascular protection in treated hypertensive patients.
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Affiliation(s)
- Guido Grassi
- Clinica Medica, Dipartimento di Medicina e Chirurgia, Universita` Milano-Bicocca, Milano, Italy; IRCCS Multimedica, Sesto San Giovanni, Milano, Italy.
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10
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Vaněčková I, Řezáčová L, Kuneš J, Zicha J. Moderate additive effects of endothelin receptor A blockade in Ren-2 transgenic rats subjected to various types of RAS blockade. Life Sci 2016; 159:127-134. [PMID: 26775568 DOI: 10.1016/j.lfs.2016.01.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Revised: 01/11/2016] [Accepted: 01/12/2016] [Indexed: 11/19/2022]
Abstract
AIMS Chronic endothelin receptor A (ETA) blockade lowered blood pressure (BP) by decreasing angiotensin-dependent vasoconstriction and attenuating calcium influx. We tested whether the addition of ETA blockade to renin-angiotensin system (RAS) blockade would have further effects on the principal vasoactive systems contributing to BP maintenance in Ren-2 transgenic rats (TGR). METHODS Four-week-old TGR rats were fed with normal-salt diet and given either different renin-angiotensin system (RAS) blockers [angiotensin receptor blocker losartan, angiotensin converting enzyme inhibitor captopril, direct renin inhibitor aliskiren], or ETA blocker (atrasentan) alone, or a combination of atrasentan with RAS blockers for 4weeks. At the end of the study, basal BP and acute BP responses to sequential blockade of renin-angiotensin (RAS), sympathetic nervous (SNS), and nitric oxide (NO) systems were determined in conscious rats. Thereafter, BP responses to acute inhibition of nifedipine-sensitive calcium influx through voltage-dependent calcium channels (L-VDCC) were measured. KEY FINDINGS All RAS blockers similarly decreased BP to normotension, their effects being mediated through substantially attenuated RAS-dependent and moderately decreased SNS-dependent vasoconstriction. Atrasentan alone partially lowered BP, while BP was normalized by combination of atrasentan with either RAS blocker. In combination therapies, BP lowering effects resulted from the attenuation of both RAS- and SNS-dependent vasoconstriction. Moreover, atrasentan-treated groups had substantially reduced NO-dependent vasodilation and significantly decreased calcium influx through L-VDCC. CONCLUSIONS Although the BP-lowering effect of combined ETA and RAS blockades in TGR is predominantly dependent on the effects exerted by RAS blockade, further effects are attributable to decreased calcium influx due to chronic ETA blockade.
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Affiliation(s)
| | | | | | - Josef Zicha
- Institute of Physiology AS CR, Prague, Czech Republic
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11
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Jarvis SS, Okada Y, Levine BD, Fu Q. Central integration and neural control of blood pressure during the cold pressor test: a comparison between hydrochlorothiazide and aliskiren. Physiol Rep 2015; 3:3/9/e12502. [PMID: 26465969 PMCID: PMC4600375 DOI: 10.14814/phy2.12502] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 07/21/2015] [Indexed: 02/07/2023] Open
Abstract
Individuals with hypertension and sympathetic overactivity are at risk for cardiovascular events. Renin inhibitors are new while thiazide diuretics are first-class drugs used for treatment of hypertension. The purpose of this study was to determine whether 6 months of treatment with aliskiren (ALSK) or hydrochlorothiazide (HCTZ) would alter blood pressure (BP) and muscle sympathetic nerve activity (MSNA) indices in older mild hypertensives during a cold pressor test (CPT). We hypothesized that the ALSK group would demonstrate a blunted response compared to HCTZ. Nineteen (9 men, 10 women) subjects performed a CPT pre- and post treatment where heart rate (HR), systolic BP (SBP) and diastolic BP (DBP), and MSNA were measured. Blood samples were withdrawn for assessment of renal-adrenal hormones. Both medications lowered ambulatory SBP and DBP (P < 0.05). Direct renin tended to be higher in the ALSK group after treatment (P = 0.081). Aldosterone was higher in the HCTZ group after treatment (P < 0.001). As expected, both groups showed increases in HR, SBP, DBP, and MSNA during the CPT (all P < 0.05). All cardiovascular and MSNA responses were similar pre- and post treatment in both groups (peak CPT SBP: 26 ± 10 vs. 17 ± 21 and 21 ± 20 vs. 29 ± 15 mmHg for pre vs. post for HCTZ and ALSK, respectively; peak CPT MSNA burst frequency: 13 ± 8 vs. 11 ± 11 and 11 ± 17 vs. 6 ± 13 bursts/min; all P > 0.05). Treatment with these antihypertensive medications lowered BP but was not successful in lowering the responsiveness to the CPT.
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Affiliation(s)
- Sara S Jarvis
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas University of Texas Southwestern Medical Center, Dallas, Texas Department of Biological Sciences, Northern Arizona University, Flagstaff, Arizona
| | - Yoshiyuki Okada
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas University of Texas Southwestern Medical Center, Dallas, Texas
| | - Benjamin D Levine
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas University of Texas Southwestern Medical Center, Dallas, Texas
| | - Qi Fu
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas University of Texas Southwestern Medical Center, Dallas, Texas
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12
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Kapil V, Sobotka PA, Saxena M, Mathur A, Knight C, Dolan E, Stanton A, Lobo MD. Central iliac arteriovenous anastomosis for hypertension: targeting mechanical aspects of the circulation. Curr Hypertens Rep 2015; 17:585. [PMID: 26228235 PMCID: PMC4521087 DOI: 10.1007/s11906-015-0585-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Raised blood pressure is the leading attributable risk factor for global morbidity and mortality. Real world data demonstrates that half of treated patients are at elevated cardiovascular risk because of inadequately controlled BP. In addition to pharmacotherapy, certain interventional strategies to reduce blood pressure and cardiovascular risk in hypertension can be considered according to international guidelines. One of the newer technologies entering this field is a proprietary arteriovenous coupler device that forms a fixed flow arteriovenous conduit in the central vasculature. In this review, we examine the development of and rationale for the creation of a central arteriovenous anastomosis in patients with hypertension and review the proposed mechanisms by which it may ameliorate hypertension. We critically review the clinical trial evidence base to date and postulate on future therapeutic directions.
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Affiliation(s)
- Vikas Kapil
- />Barts BP Centre of Excellence, Barts Heart Centre, St Bartholomew’s Hospital, W Smithfield, London, EC1A 7BE UK
- />William Harvey Research Institute, Barts NIHR Cardiovascular Biomedical Research Unit, Charterhouse Square, Queen Mary University London, London, EC1M 6BQ UK
| | - Paul A. Sobotka
- />Department of Internal Medicine, Division of Cardiovascular Diseases, The Ohio State University, Columbus, OH 43210 USA
- />ROX Medical, 150 Calle Iglesia # A, San Clemente, CA 92672 USA
| | - Manish Saxena
- />Barts BP Centre of Excellence, Barts Heart Centre, St Bartholomew’s Hospital, W Smithfield, London, EC1A 7BE UK
- />William Harvey Research Institute, Barts NIHR Cardiovascular Biomedical Research Unit, Charterhouse Square, Queen Mary University London, London, EC1M 6BQ UK
| | - Anthony Mathur
- />Barts BP Centre of Excellence, Barts Heart Centre, St Bartholomew’s Hospital, W Smithfield, London, EC1A 7BE UK
- />Department of Cardiology, Barts Heart Centre, St Bartholomew’s Hospital, W Smithfield, London, EC1A 7BE UK
| | - Charles Knight
- />Barts BP Centre of Excellence, Barts Heart Centre, St Bartholomew’s Hospital, W Smithfield, London, EC1A 7BE UK
- />Department of Cardiology, Barts Heart Centre, St Bartholomew’s Hospital, W Smithfield, London, EC1A 7BE UK
| | - Eamon Dolan
- />Department of Medicine for the Elderly, Connolly Hospital, Mill Road, Blanchardstown, Dublin 15 Dublin, Ireland
| | - Alice Stanton
- />Molecular and Cellular Therapeutics, Royal College of Surgeons in Ireland Medical School, 123 Saint Stephen’s Green, Dublin 2 Dublin, Ireland
| | - Melvin D. Lobo
- />Barts BP Centre of Excellence, Barts Heart Centre, St Bartholomew’s Hospital, W Smithfield, London, EC1A 7BE UK
- />William Harvey Research Institute, Barts NIHR Cardiovascular Biomedical Research Unit, Charterhouse Square, Queen Mary University London, London, EC1M 6BQ UK
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13
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Okada Y, Best SA, Jarvis SS, Shibata S, Parker RS, Casey BM, Levine BD, Fu Q. Asian women have attenuated sympathetic activation but enhanced renal-adrenal responses during pregnancy compared to Caucasian women. J Physiol 2015; 593:1159-68. [PMID: 25545472 DOI: 10.1113/jphysiol.2014.282277] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Accepted: 12/24/2014] [Indexed: 12/15/2022] Open
Abstract
Asians have a lower prevalence of hypertensive disorders of pregnancy than Caucasians. Since sympathetic overactivity and dysregulation of the renal-adrenal system (e.g. low aldosterone levels) have been found in preeclamptic women, we hypothesized that Asians have lower muscle sympathetic nerve activity (MSNA) and greater aldosterone concentrations during normal pregnancy than Caucasians. In a prospective study, blood pressure (BP), heart rate (HR), and MSNA were measured during supine and upright tilt (30 deg and 60 deg for 5 min each) in 9 Asians (32 ± 1 years (mean ± SEM)) and 12 Caucasians (29 ± 1 years) during pre-, early (≤8 weeks of gestation) and late (32-36 weeks) pregnancy, and post-partum (6-10 weeks after delivery). Supine MSNA increased with pregnancy in both groups (P < 0.001); it was significantly lower in Asians than Caucasians (14 ± 3 vs. 23 ± 3 bursts min(-1) and 16 ± 5 vs. 30 ± 3 bursts min(-1) in early and late pregnancy, respectively; P = 0.023). BP decreased during early pregnancy (P < 0.001), but was restored during late pregnancy. HR increased during pregnancy (P < 0.001) with no racial difference (P = 0.758). MSNA increased during tilting and it was markedly lower in Asians than Caucasians in late pregnancy (31 ± 6 vs. 49 ± 3 bursts min(-1) at 60 deg tilt; P = 0.003). Upright BP was lower in Asians, even in pre-pregnancy (P = 0.006), and this racial difference persisted during pregnancy. Direct renin and aldosterone increased during pregnancy (both P < 0.001); these hormones were greater in Asians (P = 0.086 and P = 0.014). Thus, Asians have less sympathetic activation but more upregulated renal-adrenal responses than Caucasians during pregnancy. These results may explain, at least in part, why Asian women are at low risk of hypertensive disorders in pregnancy.
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Affiliation(s)
- Yoshiyuki Okada
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, TX, USA; University of Texas Southwestern Medical Center, Dallas, TX, USA
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Gamboa A, Okamoto LE, Arnold AC, Figueroa RA, Diedrich A, Raj SR, Paranjape SY, Farley G, Abumrad N, Biaggioni I. Autonomic blockade improves insulin sensitivity in obese subjects. Hypertension 2014; 64:867-74. [PMID: 25001269 PMCID: PMC4162826 DOI: 10.1161/hypertensionaha.114.03738] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Accepted: 06/13/2014] [Indexed: 11/16/2022]
Abstract
Obesity is an important risk factor for the development of insulin resistance. Initial compensatory mechanisms include an increase in insulin levels, which are thought to induce sympathetic activation in an attempt to restore energy balance. We have previously shown, however, that sympathetic activity has no beneficial effect on resting energy expenditure in obesity. On the contrary, we hypothesize that sympathetic activation contributes to insulin resistance. To test this hypothesis, we determined insulin sensitivity using a standard hyperinsulinemic euglycemic clamp protocol in obese subjects randomly assigned in a crossover design 1 month apart to receive saline (intact day) or trimetaphan (4 mg/min IV, autonomic blocked day). Whole-body glucose uptake (MBW in mg/kg per minute) was used as index of maximal muscle glucose use. During autonomic blockade, we clamped blood pressure with a concomitant titrated intravenous infusion of the nitric oxide synthase inhibitor N-monomethyl-L-arginine. Of the 21 obese subjects (43±2 years; 35±2 kg/m(2) body mass index) studied, 14 were insulin resistant; they were more obese, had higher plasma glucose and insulin, and had higher muscle sympathetic nerve activity (23.3±1.5 versus 17.2±2.1 burst/min; P=0.03) when compared with insulin-sensitive subjects. Glucose use improved during autonomic blockade in insulin-resistant subjects (MBW 3.8±0.3 blocked versus 3.1±0.3 mg/kg per minute intact; P=0.025), with no effect in the insulin-sensitive group. These findings support the concept that sympathetic activation contributes to insulin resistance in obesity and may result in a feedback loop whereby the compensatory increase in insulin levels contributes to greater sympathetic activation.
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Affiliation(s)
- Alfredo Gamboa
- From the Division of Clinical Pharmacology, Departments of Medicine (A.G., L.E.O., A.C.A., R.A.F., A.D., S.R.R., S.Y.P., G.F., I.B.), Pharmacology (S.R.R., I.B.), Biomedical Engineering (A.D.), and Surgery (N.A.), Vanderbilt University, Nashville, TN
| | - Luis E Okamoto
- From the Division of Clinical Pharmacology, Departments of Medicine (A.G., L.E.O., A.C.A., R.A.F., A.D., S.R.R., S.Y.P., G.F., I.B.), Pharmacology (S.R.R., I.B.), Biomedical Engineering (A.D.), and Surgery (N.A.), Vanderbilt University, Nashville, TN
| | - Amy C Arnold
- From the Division of Clinical Pharmacology, Departments of Medicine (A.G., L.E.O., A.C.A., R.A.F., A.D., S.R.R., S.Y.P., G.F., I.B.), Pharmacology (S.R.R., I.B.), Biomedical Engineering (A.D.), and Surgery (N.A.), Vanderbilt University, Nashville, TN
| | - Rocio A Figueroa
- From the Division of Clinical Pharmacology, Departments of Medicine (A.G., L.E.O., A.C.A., R.A.F., A.D., S.R.R., S.Y.P., G.F., I.B.), Pharmacology (S.R.R., I.B.), Biomedical Engineering (A.D.), and Surgery (N.A.), Vanderbilt University, Nashville, TN
| | - André Diedrich
- From the Division of Clinical Pharmacology, Departments of Medicine (A.G., L.E.O., A.C.A., R.A.F., A.D., S.R.R., S.Y.P., G.F., I.B.), Pharmacology (S.R.R., I.B.), Biomedical Engineering (A.D.), and Surgery (N.A.), Vanderbilt University, Nashville, TN
| | - Satish R Raj
- From the Division of Clinical Pharmacology, Departments of Medicine (A.G., L.E.O., A.C.A., R.A.F., A.D., S.R.R., S.Y.P., G.F., I.B.), Pharmacology (S.R.R., I.B.), Biomedical Engineering (A.D.), and Surgery (N.A.), Vanderbilt University, Nashville, TN
| | - Sachin Y Paranjape
- From the Division of Clinical Pharmacology, Departments of Medicine (A.G., L.E.O., A.C.A., R.A.F., A.D., S.R.R., S.Y.P., G.F., I.B.), Pharmacology (S.R.R., I.B.), Biomedical Engineering (A.D.), and Surgery (N.A.), Vanderbilt University, Nashville, TN
| | - Ginnie Farley
- From the Division of Clinical Pharmacology, Departments of Medicine (A.G., L.E.O., A.C.A., R.A.F., A.D., S.R.R., S.Y.P., G.F., I.B.), Pharmacology (S.R.R., I.B.), Biomedical Engineering (A.D.), and Surgery (N.A.), Vanderbilt University, Nashville, TN
| | - Naji Abumrad
- From the Division of Clinical Pharmacology, Departments of Medicine (A.G., L.E.O., A.C.A., R.A.F., A.D., S.R.R., S.Y.P., G.F., I.B.), Pharmacology (S.R.R., I.B.), Biomedical Engineering (A.D.), and Surgery (N.A.), Vanderbilt University, Nashville, TN
| | - Italo Biaggioni
- From the Division of Clinical Pharmacology, Departments of Medicine (A.G., L.E.O., A.C.A., R.A.F., A.D., S.R.R., S.Y.P., G.F., I.B.), Pharmacology (S.R.R., I.B.), Biomedical Engineering (A.D.), and Surgery (N.A.), Vanderbilt University, Nashville, TN.
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15
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Curry TB. Hypertension: is it more than just a numbers game? J Physiol 2013; 591:5805-6. [PMID: 24293530 DOI: 10.1113/jphysiol.2013.266254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
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