Chronic Dantrolene Treatment Does not Affect Hypertension, but Attenuates Sympathetic Stimulation Enhanced Atrial Fibrillation Inducibility in SHR.

Chronic Dantrolene Treatment Does not Affect Hypertension, but Attenuates Sympathetic Stimulation Enhanced Atrial Fibrillation Inducibility in SHR. Am J Hypertens. 2020 Feb 15;: Authors: Lee JS, Greco L, Migirov A, Li Y, Gerdes AM, Zhang Y Abstract BACKGROUND: Ryanodine receptor (RyR) dysfunction in skeletal muscle (RyR1) leads to malignant hyperthermia, and in cardiac muscle (RyR2) triggers cardiac arrhythmias. We hypothesized that RyR dysfunction in vascular smooth muscle could increase vascular resistance and hypertension, and may contribute to increased atrial fibrillation (AF) in hypertension. Thus, stabilizing RyR function with chronic dantrolene treatment may attenuate hypertension and AF inducibility in spontaneously hypertensive rats (SHR). METHODS: Male SHR (16 weeks-old) were randomized into vehicle- (n=10) and dantrolene-treated (10mg/kg/d, n=10) groups for 4-weeks. Wistar Kyoto (WKY, n=11) rats served as controls. Blood pressures (BP) were monitored before and during the 4-week treatment. After 4- week treatment, direct BP, echocardiography and hemodynamics were recorded. AF inducibility tests were performed in vivo at baseline and repeated under sympathetic stimulation (SS). RESULTS: Compared with WKY, SHR had significantly higher BP throughout the experimental period. Dantrolene treatment had no effect on BP levels in SHR (final systolic BP 212±9mmHg in vehicle group versus 208±16 mmHg in dantrolene group, p>0.05...
Source: American Journal of Hypertension - Category: Cardiology Authors: Tags: Am J Hypertens Source Type: research

Related Links:

In this report, we describe two patients with anticentriole antibodies-positive SSc-PAH who were treated with pulmonary vasodilators. Both cases were elderly women with poor physical conditions and clinical findings of SSc. Case 1 was resistant to combination therapy with pulmonary vasodilators; in Case 2, hemodynamic improvement was obtained by upfront combination therapy at an early stage. Because anticentriole antibodies-positive SSc-PAH rapidly deteriorates, careful hemodynamic observation and timely aggressive use of pulmonary vasodilators should be considered. PMID: 32224603 [PubMed - in process]
Source: International Heart Journal - Category: Cardiology Tags: Int Heart J Source Type: research
Authors: Sugimoto K, Yoshihisa A, Nakazato K, Yokokawa T, Misaka T, Oikawa M, Kobayashi A, Yamaki T, Kunii H, Ishida T, Takeishi Y Abstract Pulmonary hypertension (PH) caused by left-sided heart disease (LHD-PH) is classified into 2 types: isolated post-capillary PH (Ipc-PH) and combined pre- and post-capillary PH (Cpc-PH). However, the impact of pulmonary vascular resistance (PVR) or diastolic pressure gradient (DPG) on the prognosis of LHD-PH has varied among previous studies. Thus, we verified the significance of PVR or DPG on the prognosis of LHD-PH in our series.We analyzed 243 consecutive LHD-PH patients. The...
Source: International Heart Journal - Category: Cardiology Tags: Int Heart J Source Type: research
No abstract available
Source: Current Opinion in Nephrology and Hypertension - Category: Urology & Nephrology Tags: EDITORIAL INTRODUCTIONS Source Type: research
This article discusses how image analysis and machine learning have enabled comprehensive characterization of kidney morphology for development of automated diagnostic and prognostic renal pathology applications. Recent findings The primordial digital pathology informatics work employed classical image analysis and machine learning to prognosticate renal disease. Although this classical approach demonstrated tremendous potential, subsequent advancements in hardware technology rendered artificial neural networks ‘(ANNs) the method of choice for machine vision in computational pathology’. Offering rapid and re...
Source: Current Opinion in Nephrology and Hypertension - Category: Urology & Nephrology Tags: RENAL IMMUNOLOGY AND PATHOLOGY: Edited by Agnes B. Fogo Source Type: research
Purpose of review The goal of this review is to present recent models of the filtration barrier that may suggest mechanism-based treatments for proteinuric renal disease. The vast majority of renal failure occurs in diseases of glomerular proteinuria. The physiology of the filtration barrier remains incompletely understood, preventing invention of mechanism-based therapies. Research is currently dominated by molecular biology approaches to the kidney instead of engineering-based filtration and transport models. Recent findings Reexamination of two older paradigms (basement membrane and slit diaphragm) and critical ana...
Source: Current Opinion in Nephrology and Hypertension - Category: Urology & Nephrology Tags: RENAL IMMUNOLOGY AND PATHOLOGY: Edited by Agnes B. Fogo Source Type: research
Purpose of review Epigenetic modifications are reversible changes to a cell's DNA or histones that alter gene expression but not DNA sequence. The present review will explore epigenomic profiling and bioinformatics techniques for the study of kidney development and disease. Recent findings Reversible DNA and histone modifications influence chromatin accessibility and can be measured by a variety of recent techniques including DNase-seq, ATAC-seq, and single cell ATAC-seq. These approaches have been used to demonstrate that DNA methylation is critical for nephron progenitor maturation, for example. New bioinformatics t...
Source: Current Opinion in Nephrology and Hypertension - Category: Urology & Nephrology Tags: RENAL IMMUNOLOGY AND PATHOLOGY: Edited by Agnes B. Fogo Source Type: research
Purpose of review Macrophages play an important role in regulating homeostasis, kidney injury, repair, and tissue fibrogenesis. The present review will discuss recent advances that explore the novel subsets and functions of macrophage in the pathogenesis of kidney damage and hypertension. Recent findings Macrophages differentiate into a variety of subsets in microenvironment-dependent manner. Although the M1/M2 nomenclature is still applied in considering the pro-inflammatory versus anti-inflammatory effects of macrophages in kidney injury, novel, and accurate macrophage phenotypes are defined by flow cytometric marke...
Source: Current Opinion in Nephrology and Hypertension - Category: Urology & Nephrology Tags: RENAL IMMUNOLOGY AND PATHOLOGY: Edited by Agnes B. Fogo Source Type: research
We examined whether patients at increased risk for OSA, assessed by the STOP-BANG (snoring, tired during the day, observed stop breathing during sleep, high blood pressure, body mass index more than 35 kg/m, age more than 50 years, neck circumference more than 40 cm, and male gender) questionnaire, had a higher incidence of new-onset postoperative atrial fibrillation after cardiac surgery. Because both postoperative atrial fibrillation and OSA increase resource utilization, we secondarily examined whether patients at increased OSA risk had longer duration of postoperative mechanical ventilation and intensive care unit (ICU...
Source: Anesthesia and Analgesia - Category: Anesthesiology Authors: Tags: Anesth Analg Source Type: research
This study found that though it is often associated with coronary artery disease (CAD), it can also occur in those without significant CAD. It was not specifically associated with disease of right coronary artery disease. This cardioinhibitory response may be a manifestation of the Bezold-Jarisch reflex. Bezold-Jarisch reflex inhibits sympathetic activity (sympathetic withdrawal) and increases parasympathetic activity, resulting in bradycardia, which may be associated with vasodilatation, nausea and hypotension. Bezold-Jarisch has been described in the setting of inferior wall infarction and coronary angiography. Origin...
Source: Cardiophile MD - Category: Cardiology Authors: Tags: Cardiology MCQ Cardiology X-ray Featured Source Type: blogs
Please wait while the activity loads. If this activity does not load, try refreshing your browser. Also, this page requires javascript. Please visit using a browser with javascript enabled. If loading fails, click here to try again Click on the 'Start' button to begin the mock test. After answering all questions, click on the 'Get Results' button to display your score and the explanations. There is no time limit for this mock test. Start Congratulations - you have completed DM / DNB Cardiology Entrance Mock Test 7. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rate...
Source: Cardiophile MD - Category: Cardiology Authors: Tags: Cardiology MCQ DM / DNB Cardiology Entrance Featured Source Type: blogs
More News: Arrhythmia | Atrial Fibrillation | Cancer & Oncology | Cardiac Arrhythmia | Cardiology | Hypertension | Reflex Sympathetic Dystrophy