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Kharazmi F, Hosseini-Dastgerdi H, Pourshanazari AA, Nematbakhsh M. The denervation or activation of renal sympathetic nerve and renal blood flow. JOURNAL OF RESEARCH IN MEDICAL SCIENCES : THE OFFICIAL JOURNAL OF ISFAHAN UNIVERSITY OF MEDICAL SCIENCES 2023; 28:76. [PMID: 38152073 PMCID: PMC10751519 DOI: 10.4103/jrms.jrms_216_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 07/09/2023] [Accepted: 07/17/2023] [Indexed: 12/29/2023]
Abstract
The denervation or activation of the sympathetic nerve in the kidney can affect renal hemodynamics. The sympathetic nervous system regulates the physiological functions of the kidneys. Stimulation of sympathetic efferent nerves affects various parameters related to renal hemodynamics, including sodium excretion, renin secretion, and renal blood flow (RBF). Hence, renal sympathetic fibers may also play an essential role in regulating systemic vascular resistance and controlling blood pressure. In the absence of renal nerves, the hemodynamics response to stimuli is negligible or absent. The effect of renal sympathetic denervation on RBF is dependent on several factors such as interspecies differences, the basic level of nerve activity in the vessels or local density of adrenergic receptor in the vascular bed. The role of renal denervation has been investigated therapeutically in hypertension and related disorders. Hence, the dynamic impact of renal nerves on RBF enables using RBF dynamic criteria as a marker for renal denervation therapy.
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Affiliation(s)
- Fatemeh Kharazmi
- Water and Electrolytes Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
- Department of Physiology, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Hajaralsadat Hosseini-Dastgerdi
- Water and Electrolytes Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
- Department of Physiology, Isfahan University of Medical Sciences, Isfahan, Iran
| | | | - Mehdi Nematbakhsh
- Water and Electrolytes Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
- Department of Physiology, Isfahan University of Medical Sciences, Isfahan, Iran
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Liu H, Li Y, Zhou H, Chen W, Xu Y, Du H, Zhang B, Xia T, Li D, Ou Z, Tang R, Chen Q, Zhao B, Yin Y. Renal nerve stimulation identifies renal innervation and optimizes the strategy for renal denervation in canine. J Transl Med 2023; 21:100. [PMID: 36759871 PMCID: PMC9912587 DOI: 10.1186/s12967-023-03919-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 01/25/2023] [Indexed: 02/11/2023] Open
Abstract
BACKGROUND Renal denervation (RDN) was still performed without any intra-procedural method for nerve mapping. Whether renal nerve stimulation (RNS) is an efficient way to identify renal autonomic innervation and optimize the strategy for RDN remain to be worthy for further exploration. METHODS The characteristics of renal autonomic innervation at the sites with different blood pressure (BP) responses to RNS were explored. Then, dogs anatomically eligible for RDN were randomly assigned into elevated BP response ablation group, reduced BP response ablation group, and RNS-control group. The postoperative outcomes were measured at baseline and after 4 weeks follow-up. RESULTS The proportion of afferent sensory nerve was higher at elevated BP response sites (ERS) than reduced BP response sites (RRS) and non-response sites (NRS) (P = 0.012 and P = 0.004). Conversely, the proportion of parasympathetic nerve at RRS was the highest (RRS vs. ERS, P = 0.017; RRS vs. NRS, P = 0.023). More importantly, there was a significant correlation between systolic blood pressure changes and the area ratios of afferent sensory and parasympathetic nerve (R = 0.859; P < 0.001). In addition, ablation at BP-elevation sites can result in a significant decrease in BP and plasma norepinephrine (NE) after 4 weeks (P = 0.002; P = 0.008), while ablation at BP-reduction sites can lead to significant increases in BP and plasma NE (P = 0.016; P = 0.033). CONCLUSIONS RNS is an effective method to identify renal autonomic innervation. It could not only help to identify optimal target sites, but also avoid ablation of sympathetic-inhibitory areas during RDN.
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Affiliation(s)
- Hang Liu
- grid.412461.40000 0004 9334 6536Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China ,Chongqing Cardiac Arrhythmias Therapeutic Service Center, Chongqing, China
| | - Yidan Li
- grid.412461.40000 0004 9334 6536Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China ,Chongqing Cardiac Arrhythmias Therapeutic Service Center, Chongqing, China
| | - Hao Zhou
- grid.412461.40000 0004 9334 6536Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China ,Chongqing Cardiac Arrhythmias Therapeutic Service Center, Chongqing, China
| | - Weijie Chen
- grid.412461.40000 0004 9334 6536Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China ,Chongqing Cardiac Arrhythmias Therapeutic Service Center, Chongqing, China
| | - Yanping Xu
- grid.412461.40000 0004 9334 6536Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China ,Chongqing Cardiac Arrhythmias Therapeutic Service Center, Chongqing, China
| | - Huaan Du
- grid.412461.40000 0004 9334 6536Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China ,Chongqing Cardiac Arrhythmias Therapeutic Service Center, Chongqing, China
| | - Bo Zhang
- grid.412461.40000 0004 9334 6536Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China ,Chongqing Cardiac Arrhythmias Therapeutic Service Center, Chongqing, China
| | - Tianli Xia
- grid.412461.40000 0004 9334 6536Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China ,Chongqing Cardiac Arrhythmias Therapeutic Service Center, Chongqing, China
| | - Dan Li
- grid.412461.40000 0004 9334 6536Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China ,Chongqing Cardiac Arrhythmias Therapeutic Service Center, Chongqing, China
| | - Zhenhong Ou
- grid.412461.40000 0004 9334 6536Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China ,Chongqing Cardiac Arrhythmias Therapeutic Service Center, Chongqing, China
| | - Ruotian Tang
- grid.412461.40000 0004 9334 6536Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China ,Chongqing Cardiac Arrhythmias Therapeutic Service Center, Chongqing, China
| | - Qingsong Chen
- grid.412461.40000 0004 9334 6536Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China ,Chongqing Cardiac Arrhythmias Therapeutic Service Center, Chongqing, China
| | - Binyi Zhao
- grid.412461.40000 0004 9334 6536Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China ,Chongqing Cardiac Arrhythmias Therapeutic Service Center, Chongqing, China
| | - Yuehui Yin
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China. .,Chongqing Cardiac Arrhythmias Therapeutic Service Center, Chongqing, China. .,Chongqing Key Laboratory of Arrhythmia, Chongqing, China.
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Lai Y, Zhou H, Chen W, Liu H, Liu G, Xu Y, Du H, Zhang B, Li Y, Woo K, Yin Y. The intrarenal blood pressure modulation system is differentially altered after renal denervation guided by different intensities of blood pressure responses. Hypertens Res 2023; 46:456-467. [PMID: 36202981 DOI: 10.1038/s41440-022-01047-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 08/16/2022] [Accepted: 08/17/2022] [Indexed: 02/07/2023]
Abstract
The aim of this study was to investigate alterations in the intrarenal blood pressure (BP) regulation system after renal denervation (RDN) guided by renal nerve stimulation (RNS). Twenty-one dogs were randomized to receive RDN at strong (SRA group, n = 7) or weak (WRA group, n = 7) BP-elevation response sites identified by RNS or underwent RNS only (RNS-control, RSC, n = 7). After 4 weeks of follow-up, renal sympathetic components, the main components of renin-angiotensin system (RAS) and the major transporters involved in sodium and water reabsorption were assessed by immunohistochemical analysis. Compared with RSC treatment, RDN therapy significantly reduced renal norepinephrine and tyrosine hydroxylase levels, decreased the renin content and inhibited the onsite generation of angiotensinogen. Moreover, the expression of exciting axis components, including angiotensin-converting enzyme (ACE), angiotensin II and angiotensin II type-1 receptor, was downregulated, while protective axis components for the cardiovascular system, including ACE2 and Mas receptors, were upregulated in both WRA and SRA groups. Moreover, RDN reduced the abundance of aquaporin-1 and aquaporin-2 in kidneys. Although RDN had a minimal effect on overall NKCC2 expression, its activation (p-NKCC2) and directional enrichment in the apical membrane (mNKCC2) were dramatically blunted. All these changes were more obvious in the SRA group than WRA group. Selective RDN guided by RNS effectively reduced systemic BP by affecting the renal neurohormone system, as well as the sodium and water transporter system, and these effects at sites with a strong BP response were more superior.
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Affiliation(s)
- Yinchuan Lai
- Department of Cardiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing Cardiac Arrhythmia Therapeutic Service Center, Chongqing Key Laboratory of Arrhythmia, Chongqing, China
- Department of Cardiology, the Second People's Hospital of Yibin & West China Hospital, Sichuan University Yibin Hospital, Yibin City, Sichuan, China
| | - Hao Zhou
- Department of Cardiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing Cardiac Arrhythmia Therapeutic Service Center, Chongqing Key Laboratory of Arrhythmia, Chongqing, China
| | - Weijie Chen
- Department of Cardiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing Cardiac Arrhythmia Therapeutic Service Center, Chongqing Key Laboratory of Arrhythmia, Chongqing, China
| | - Hang Liu
- Department of Cardiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing Cardiac Arrhythmia Therapeutic Service Center, Chongqing Key Laboratory of Arrhythmia, Chongqing, China
| | - Guangliang Liu
- Department of Cardiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing Cardiac Arrhythmia Therapeutic Service Center, Chongqing Key Laboratory of Arrhythmia, Chongqing, China
| | - Yanping Xu
- Department of Cardiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing Cardiac Arrhythmia Therapeutic Service Center, Chongqing Key Laboratory of Arrhythmia, Chongqing, China
| | - Huaan Du
- Department of Cardiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing Cardiac Arrhythmia Therapeutic Service Center, Chongqing Key Laboratory of Arrhythmia, Chongqing, China
| | - Bo Zhang
- Department of Cardiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing Cardiac Arrhythmia Therapeutic Service Center, Chongqing Key Laboratory of Arrhythmia, Chongqing, China
| | - Yidan Li
- Department of Cardiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing Cardiac Arrhythmia Therapeutic Service Center, Chongqing Key Laboratory of Arrhythmia, Chongqing, China
| | - Kamsang Woo
- Institute of Future Cities, the Chinese University of Hong Kong, Hong Kong, China
| | - Yuehui Yin
- Department of Cardiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing Cardiac Arrhythmia Therapeutic Service Center, Chongqing Key Laboratory of Arrhythmia, Chongqing, China.
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Renal Denervation Influences Angiotensin II Types 1 and 2 Receptors. Int J Nephrol 2022; 2022:8731357. [PMID: 36262553 PMCID: PMC9576444 DOI: 10.1155/2022/8731357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2022] [Revised: 09/05/2022] [Accepted: 09/12/2022] [Indexed: 11/17/2022] Open
Abstract
The sympathetic and renin-angiotensin systems (RAS) are two critical regulatory systems in the kidney which affect renal hemodynamics and function. These two systems interact with each other so that angiotensin II (Ang II) has the presynaptic effect on the norepinephrine secretion. Another aspect of this interaction is that the sympathetic nervous system affects the function and expression of local RAS receptors, mainly Ang II receptors. Therefore, in many pathological conditions associated with an increased renal sympathetic tone, these receptors' expression changes and renal denervation can normalize these changes and improve the diseases. It seems that the renal sympathectomy can alter Ang II receptors expression and the distribution of RAS receptors in the kidneys, which influence renal functions.
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Present Evidence of Determinants to Predict the Efficacy of Renal Denervation. Int J Hypertens 2022; 2022:5694127. [PMID: 35992203 PMCID: PMC9391193 DOI: 10.1155/2022/5694127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 07/22/2022] [Indexed: 11/18/2022] Open
Abstract
Sympathetic overactivation is one of the main contributors to development and progress of hypertension. Renal denervation (RDN) has been evidenced by series of clinical trials for its efficacy and safety to treat overactivated sympathetic nervous system induced diseases. However, the results were inconsistent and not all patients benefited from RDN. Appropriate patient selection and intraoperative factors to improve the efficacy of RDN need to be solved urgently. Over the decade, research studies on the correlations between indicators and the antihypertensive effects have been conducted and made a fairly well progress. Herein, we comprehensively reviewed the research studies on how to make RDN more predictable or improve the efficacy of RDN and summarized these potential indicators or devices which might be applied in clinical settings.
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Du X. Sympatho-adrenergic mechanisms in heart failure: new insights into pathophysiology. MEDICAL REVIEW (BERLIN, GERMANY) 2021; 1:47-77. [PMID: 37724075 PMCID: PMC10388789 DOI: 10.1515/mr-2021-0007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 06/02/2021] [Indexed: 09/20/2023]
Abstract
The sympathetic nervous system is activated in the setting of heart failure (HF) to compensate for hemodynamic instability. However, acute sympathetic surge or sustained high neuronal firing rates activates β-adrenergic receptor (βAR) signaling contributing to myocardial remodeling, dysfunction and electrical instability. Thus, sympatho-βAR activation is regarded as a hallmark of HF and forms pathophysiological basis for β-blocking therapy. Building upon earlier research findings, studies conducted in the recent decades have significantly advanced our understanding on the sympatho-adrenergic mechanism in HF, which forms the focus of this article. This review notes recent research progress regarding the roles of cardiac β2AR or α1AR in the failing heart, significance of β1AR-autoantibodies, and βAR signaling through G-protein independent signaling pathways. Sympatho-βAR regulation of immune cells or fibroblasts is specifically discussed. On the neuronal aspects, knowledge is assembled on the remodeling of sympathetic nerves of the failing heart, regulation by presynaptic α2AR of NE release, and findings on device-based neuromodulation of the sympathetic nervous system. The review ends with highlighting areas where significant knowledge gaps exist but hold promise for new breakthroughs.
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Affiliation(s)
- Xiaojun Du
- Faculty of Physiology and Pathophysiology, School of Basic Medical Sciences, Xi’an Jiaotong University Health Science Center, 76 West Yanta Road, Xi’an710061, Shaanxi, China
- Baker Heart and Diabetes Institute, 75 Commercial Road, Melbourne, VIC3004, Australia
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Angiotensin-Converting Enzyme 2 (ACE2) in the Context of Respiratory Diseases and Its Importance in Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Infection. Pharmaceuticals (Basel) 2021; 14:ph14080805. [PMID: 34451902 PMCID: PMC8398530 DOI: 10.3390/ph14080805] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 08/02/2021] [Accepted: 08/11/2021] [Indexed: 12/14/2022] Open
Abstract
Angiotensin-Converting Enzyme 2 (ACE2) is an 805 amino acid protein encoded by the ACE2 gene expressed in various human cells, especially in those located in the epithelia. The primary function of ACE2 is to produce angiotensin (1–7) from angiotensin II (Ang II). The current research has described the importance of ACE2 and Ang (1–7) in alternative routes of the renin-angiotensin system (RAS) that promote the downregulation of fibrosis, inflammation, and oxidative stress processes in a great variety of diseases, such as hypertension, acute lung injury, liver cirrhosis, and kidney abnormalities. Investigations into the recent outbreak of the new severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) have revealed the importance of ACE2 during infection and its role in recognizing viral binding proteins through interactions with specific amino acids of this enzyme. Additionally, the ACE2 expression in several organs has allowed us to understand the clinical picture related to the infection caused by SARS-CoV-2. This review aims to provide context for the functions and importance of ACE2 with regards to SARS-CoV-2 in the general clinical aspect and its impact on other diseases, especially respiratory diseases.
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Oz M, Lorke DE, Kabbani N. A comprehensive guide to the pharmacologic regulation of angiotensin converting enzyme 2 (ACE2), the SARS-CoV-2 entry receptor. Pharmacol Ther 2021; 221:107750. [PMID: 33275999 PMCID: PMC7854082 DOI: 10.1016/j.pharmthera.2020.107750] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 11/18/2020] [Accepted: 11/19/2020] [Indexed: 02/06/2023]
Abstract
The recent emergence of coronavirus disease-2019 (COVID-19) as a global pandemic has prompted scientists to address an urgent need for defining mechanisms of disease pathology and treatment. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the causative agent for COVID-19, employs angiotensin converting enzyme 2 (ACE2) as its primary target for cell surface attachment and likely entry into the host cell. Thus, understanding factors that may regulate the expression and function of ACE2 in the healthy and diseased body is critical for clinical intervention. Over 66% of all adults in the United States are currently using a prescription drug and while earlier findings have focused on possible upregulation of ACE2 expression through the use of renin angiotensin system (RAS) inhibitors, mounting evidence suggests that various other widely administered drugs used in the treatment of hypertension, heart failure, diabetes mellitus, hyperlipidemias, coagulation disorders, and pulmonary disease may also present a varied risk for COVID-19. Specifically, we summarize mechanisms on how heparin, statins, steroids and phytochemicals, besides their established therapeutic effects, may also interfere with SARS-CoV-2 viral entry into cells. We also describe evidence on the effect of several vitamins, phytochemicals, and naturally occurring compounds on ACE2 expression and activity in various tissues and disease models. This comprehensive review aims to provide a timely compendium on the potential impact of commonly prescribed drugs and pharmacologically active compounds on COVID-19 pathology and risk through regulation of ACE2 and RAS signaling.
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Key Words
- adam17, a disintegrin and metalloprotease 17
- ace, angiotensin i converting enzyme
- ace-inh., angiotensin i converting enzyme inhibitor
- ampk, amp-activated protein kinase
- ang-ii, angiotensin ii
- arb, angiotensin ii type 1-receptor blocker
- ards, acute respiratory distress syndrome
- at1-r, angiotensin ii type 1-receptor
- βarb, β-adrenergic receptor blockers
- bk, bradykinin
- ccb, calcium channel blockers
- ch25h, cholesterol-25-hydroxylase
- copd, chronic obstructive lung disease
- cox, cyclooxygenase
- covid-19, coronavirus disease-2019
- dabk, [des-arg9]-bradykinin
- erk, extracellular signal-regulated kinase
- 25hc, 25-hydroxycholesterol
- hs, heparan sulfate
- hspg, heparan sulfate proteoglycan
- ibd, inflammatory bowel disease
- map, mitogen-activated protein
- mers, middle east respiratory syndrome
- mrb, mineralocorticoid receptor blocker
- nos, nitric oxide synthase
- nsaid, non-steroid anti-inflammatory drug
- ras, renin-angiotensin system
- sars-cov, severe acute respiratory syndrome coronavirus
- sh, spontaneously hypertensive
- s protein, spike protein
- sirt1, sirtuin 1
- t2dm, type 2 diabetes mellitus
- tcm, traditional chinese medicine
- tmprss2, transmembrane protease, serine 2
- tnf, tumor necrosis factor
- ufh, unfractionated heparin
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Affiliation(s)
- Murat Oz
- Department of Pharmacology and Therapeutics, Faculty of Pharmacy, Kuwait University, Safat 13110, Kuwait.
| | - Dietrich Ernst Lorke
- Department of Anatomy and Cellular Biology, College of Medicine and Health Sciences, Khalifa University, Abu Dhabi, United Arab Emirates; Center for Biotechnology, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
| | - Nadine Kabbani
- School of Systems Biology, George Mason University, Fairfax, VA 22030, USA
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Catheter-Based Radiofrequency Renal Sympathetic Denervation Decreases Left Ventricular Hypertrophy in Hypertensive Dogs. Mediators Inflamm 2021; 2021:9938486. [PMID: 33986629 PMCID: PMC8093032 DOI: 10.1155/2021/9938486] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 04/06/2021] [Accepted: 04/10/2021] [Indexed: 01/19/2023] Open
Abstract
This study explored the effects of renal sympathetic denervation (RDN) on hyperlipidity-induced cardiac hypertrophy in beagle dogs. Sixty beagles were randomly assigned to the control group, RDN group, or sham-operated group. The control group was fed with a basal diet, while the other two groups were given a high-fat diet to induce model hypertension. The RDN group underwent an RDN procedure, and the sham-operated group underwent only renal arteriography. At 1, 3, and 6 months after the RDN procedure, the diastolic blood pressure (DBP) and systolic blood pressure (SBP) levels were markedly decreased in the RDN group relative to the sham group (P < 0.05). After 6 months, serum norepinephrine (NE) and angiotensin II (AngII), as well as left ventricular levels, in the RDN group were statistically lower than those in the sham group (P < 0.05). Also, the left ventricular mass (LVM) and left ventricular mass index (LVMI) were significantly decreased, while the E/A peak ratio was drastically elevated (P < 0.05). Pathological examination showed that the degree of left ventricular hypertrophy and fibrosis in the RDN group was statistically decreased relative to those of the sham group and that the collagen volume fraction (CVF) and perivascular circumferential collagen area (PVCA) were also significantly reduced (P < 0.05). Renal sympathetic denervation not only effectively reduced blood pressure levels in hypertensive dogs but also reduced left ventricular hypertrophy and myocardial fibrosis and improved left ventricular diastolic function. The underlying mechanisms may involve a reduction of NE and AngII levels in the circulation and myocardial tissues, which would lead to the delayed occurrence of left ventricular remodeling.
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