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https://www.readbyqxmd.com/read/29334670/genetic-ablation-of-trpv1-exacerbates-pressure-overload-induced-cardiac-hypertrophy
#1
Beihua Zhong, Jack Rubinstein, Shuangtao Ma, Donna H Wang
Transient receptor potential vanilloid 1 (TRPV1) channels expressed in sensory nerves may regulate vascular tone and cardiovascular function via their anti-inflammatory effects by releasing neuropeptide calcitonin gene-related peptide (CGRP). Inflammation plays a role in the progression of cardiac hypertrophy and TRPV1 activation may be key to cardiac inflammatory processes. The aim of this study was to test the hypothesis that TRPV1 modulates inflammatory processes to protect the heart from pressure overload-induced hypertrophy and inflammatory responses...
January 12, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29334615/hemodynamic-and-metabolic-responses-to-self-paced-and-ramp-graded-exercise-testing-protocols
#2
Nicholas M Beltz, Fabiano Amorim, Ann L Gibson, Jeffrey M Janot, Len Kravitz, Christine M Mermier, Nathan Cole, Terence A Moriarty, Tony P Nunez, Sam Trigg, Lance Dalleck
PURPOSE: Recent examinations have shown lower maximal oxygen uptake (VO2max) during traditional ramp (RAMP) compared to self-paced (SPV) graded exercise testing (GXT) attributed to differences in cardiac ouput. The current study examined the differences in hemodyamic and metabolic responses between RAMP and SPV during treadmill exercise. METHODS: Sixteen recreationally trained men (23.7±3.0 yrs) completed two separate treadmill GXT protocols. SPV consisted of five 2-min stages (10 min total) of increasing speed clamped by the Borg RPE6-20 scale...
January 15, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29334508/practical-valvular-issues-in-patients-requiring-ventricular-assist-devices
#3
Mitesh Badiwala, Terrence Yau
PURPOSE OF REVIEW: As ventricular assist device (VAD) therapy in patients with advanced heart failure continues to grow, experience with concomitant valvular diseases present either before or after VAD implantation continues to accrue. In this review, we discuss recent data and current practice as it pertains to the subject of concomitant valvular disease in patients requiring VADs. RECENT FINDINGS: Persistent aortic valve closure has been identified as a potential contributor to aortic valve 'disuse atrophy' resulting in valve degeneration...
January 13, 2018: Current Opinion in Cardiology
https://www.readbyqxmd.com/read/29333789/physical-training-in-a-medical-fitness-room-for-patients-with-chronic-diseases-functional-and-metabolic-outcomes
#4
Oshrat E Tayer-Shifman, Yigal Bar-On, David Pereg, Alon Y Hershko
BACKGROUND: Physical inactivity is a pivotal factor in the development and progression of various chronic diseases. However, most fitness facilities exclude unhealthy individuals. Therefore, an exercise program that admits such patients is imperative. OBJECTIVES: To evaluate the effectiveness of a fitness facility that admits adult subjects with multiple chronic diseases. METHODS: We conducted a retrospective screening of patient records from the Medical Fitness Facility at Meir Medical Center, Israel...
January 2018: Israel Medical Association Journal: IMAJ
https://www.readbyqxmd.com/read/29333726/calcium-current-properties-in-dystrophin-deficient-ventricular-cardiomyocytes-from-aged-mdx-mice
#5
Lena Rubi, Hannes Todt, Helmut Kubista, Xaver Koenig, Karlheinz Hilber
Duchenne muscular dystrophy (DMD), caused by mutations in the gene encoding for the cytoskeletal protein dystrophin, is linked with severe cardiac complications including cardiomyopathy development and cardiac arrhythmias. We and others recently reported that currents through L-type calcium (Ca) channels were significantly increased, and channel inactivation was reduced in dystrophin-deficient ventricular cardiomyocytes derived from the mdx mouse, the most commonly used animal model for human DMD. These gain-of-function Ca channel abnormalities may enhance the risk of Ca-dependent arrhythmias and cellular Ca overload in the dystrophic heart...
January 2018: Physiological Reports
https://www.readbyqxmd.com/read/29333691/the-innate-immune-system-in-chronic-cardiomyopathy-a-european-society-of-cardiology-esc-scientific-statement-from-the-working-group-on-myocardial-function-of-the-esc
#6
REVIEW
Stefan Frantz, Ines Falcao-Pires, Jean-Luc Balligand, Johann Bauersachs, Dirk Brutsaert, Michele Ciccarelli, Dana Dawson, Leon J de Windt, Mauro Giacca, Nazha Hamdani, Denise Hilfiker-Kleiner, Emilio Hirsch, Adelino Leite-Moreira, Manuel Mayr, Thomas Thum, Carlo G Tocchetti, Jolanda van der Velden, Gilda Varricchi, Stephane Heymans
Activation of the immune system in heart failure (HF) has been recognized for over 20 years. Initially, experimental studies demonstrated a maladaptive role of the immune system. However, several phase III trials failed to show beneficial effects in HF with therapies directed against an immune activation. Preclinical studies today describe positive and negative effects of immune activation in HF. These different effects depend on timing and aetiology of HF. Therefore, herein we give a detailed review on immune mechanisms and their importance for the development of HF with a special focus on commonalities and differences between different forms of cardiomyopathies...
January 15, 2018: European Journal of Heart Failure
https://www.readbyqxmd.com/read/29333676/ether-%C3%A3-go-go-k-channels-effective-modulators-of-neuronal-excitability
#7
Christiane K Bauer, Jürgen R Schwarz
Mammalian EAG (ether-à-go-go) channels are voltage-gated K+ channels. They are encoded by the KCNH gene family and divided into three subfamilies, eag (Kv10), erg (eag-related gene; Kv11) and elk (eag-like; Kv12). All EAG channel subtypes are expressed in the brain where they effectively modulate neuronal excitability. This Topical Review describes the biophysical properties of each of the EAG channel subtypes, their function in neurons and the neurological diseases induced by EAG channel mutations. In contrast to the function of erg currents in the heart where they contribute to repolarization of the cardiac action potential, erg currents in neurons are involved in the maintenance of the resting potential, setting of action potential threshold and frequency accommodation...
January 15, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29333503/the-effect-of-a-vegan-versus-aha-diet-in-coronary-artery-disease-evade-cad-trial-study-design-and-rationale
#8
Binita Shah, Lisa Ganguzza, James Slater, Jonathan D Newman, Nicole Allen, Edward Fisher, John Larigakis, Francisco Ujueta, Eugenia Gianos, Yu Guo, Kathleen Woolf
Background: Multiple studies demonstrate the benefit of a vegan diet on cardiovascular risk factors when compared to no intervention or usual dietary patterns. The aim of this study is to evaluate the effect of a vegan diet versus the American Heart Association (AHA)-recommended diet on inflammatory and glucometabolic profiles in patients with angiographically defined coronary artery disease (CAD). Study Design: This study is a randomized, open label, blinded end-point trial of 100 patients with CAD as defined by ≥50% diameter stenosis in a coronary artery ≥2 mm in diameter on invasive angiography...
December 2017: Contemporary Clinical Trials Communications
https://www.readbyqxmd.com/read/29333483/how-heart-rate-variability-affects-emotion-regulation-brain-networks
#9
Mara Mather, Julian Thayer
Individuals with high heart rate variability tend to have better emotional well-being than those with low heart rate variability, but the mechanisms of this association are not yet clear. In this paper, we propose the novel hypothesis that by inducing oscillatory activity in the brain, high amplitude oscillations in heart rate enhance functional connectivity in brain networks associated with emotion regulation. Recent studies using daily biofeedback sessions to increase the amplitude of heart rate oscillations suggest that high amplitude physiological oscillations have a causal impact on emotional well-being...
February 2018: Current Opinion in Behavioral Sciences
https://www.readbyqxmd.com/read/29333094/left-ventricular-diastolic-and-systolic-dyssynchrony-and-dysfunction-in-heart-failure-with-preserved-ejection-fraction-and-a-narrow-qrs-complex
#10
Shuang Liu, Zhengyu Guan, Xuanyi Jin, Pingping Meng, Yonghuai Wang, Xianfeng Zheng, Dalin Jia, Chunyan Ma, Jun Yang
Aims: Mechanical dyssynchrony has been reported in heart failure with preserved ejection fraction (HFpEF), with a majority of patients having a narrow QRS complex; however, whether any benefit is observed with restoration of dyssynchrony remains unclear. We sought to assess left ventricular (LV) dyssynchrony and function in HFpEF and elucidate the underlying mechanisms that may account for HFpEF. Methods: Seventy-eighty patients with a narrow QRS complex including 47 with HFpEF, 31 with heart failure with reduced ejection fraction (HFrEF) patients, and 29 with asymptomatic left ventricular diastolic dysfunction (LVDD) were recruited...
2018: International Journal of Medical Sciences
https://www.readbyqxmd.com/read/29333051/therapeutic-significance-of-loligo-vulgaris-lamarck-1798-ink-extract-a-biomedical-approach
#11
Sri Kumaran Nadarajah, Radha Vijayaraj, Jayaprakashvel Mani
Background: The squid ink extract is well known for its biomedical properties. Objective: In this study, squid Loligo vulgaris was collected from Tuticorin costal water, Bay of Bengal, India. Materials and Methods: Proximate composition of the crude squid ink was studied and found to have protein as the major component over lipid and carbohydrates. Further, bioactive fractions of squid ink were extracted with ethanol, and therapeutic applications such as hemolytic, antioxidant, antimicrobial, and in vitro anti-inflammatory properties were analyzed using standard methods...
December 2017: Pharmacognosy Research
https://www.readbyqxmd.com/read/29332921/early-diastolic-left-ventricular-relaxation-in-normal-neonates-is-influenced-by-ventricular-stiffness-and-longitudinal-systolic-function
#12
Yukako Homma, Yasunobu Hayabuchi, Tomomasa Terada, Miki Inoue, Kazuhiro Mori
Tissue Doppler velocity during early diastole (e') is one of the most feasible and reproducible echocardiographic assessments to reflect active relaxation of the left ventricle. Although several reports have described the mechanisms of temporal diastolic dysfunction in the early neonatal period, factors influencing diastolic function have not been determined. The purpose of this study was to elucidate factors significantly influencing e' in the early neonatal period.A total of 179 consecutive normal neonates underwent echocardiographic studies performed at 0 days and 5-10 days after birth...
January 15, 2018: International Heart Journal
https://www.readbyqxmd.com/read/29332919/high-intensity-interval-training-for-severe-left-ventricular-dysfunction-treated-with-left-ventricular-assist-device
#13
Yusuke Ugata, Hiroshi Wada, Kenichi Sakakura, Tatsuro Ibe, Miyuki Ito, Nahoko Ikeda, Hideo Fujita, Shin-Ichi Momomura
Aerobic training based on anaerobic threshold (AT) is well-known to improve cardiac function, exercise capacity, and long-term outcomes of patients with heart failure. Recent reports suggested that high-intensity interval training (HIIT) for patients with cardiovascular disease may improve cardiopulmonary exercise capacity. We present a 61-year-old male patient of severe left ventricular dysfunction with left ventricular assisted device (LVAD). Following HIIT for 8 weeks, exercise capacity and muscle strength have improved without worsening left ventricular function...
January 15, 2018: International Heart Journal
https://www.readbyqxmd.com/read/29332911/impact-of-continuous-administration-of-tolvaptan-on-preventing-medium-term-worsening-renal-function-and-long-term-adverse-events-in-heart-failure-patients-with-chronic-kidney-disease
#14
Yusuke Nakano, Tomofumi Mizuno, Toru Niwa, Kentaro Mukai, Hirokazu Wakabayashi, Atsushi Watanabe, Hirohiko Ando, Hiroaki Takashima, Kenta Murotani, Katsuhisa Waseda, Tetsuya Amano
Tolvaptan (TLV) has an inhibiting effect for worsening renal function (WRF) in acute decompensated heart failure (HF) patients. However, there are limited data regarding the effect of continuous TLV administration on medium-term WRF.This was a retrospective observational study in hospitalized HF patients with chronic kidney disease (CKD). TLV was administered to those patients with fluid retention despite standard HF therapy. We compared 34 patients treated with TLV (TLV group) to 33 patients treated with conventional HF therapy with high-dose loop diuretics (furosemide ≥ 40 mg) (Loop group)...
January 15, 2018: International Heart Journal
https://www.readbyqxmd.com/read/29332614/serelaxin-for-infant-heart-failure-in-congenital-dilated-cardiomyopathy
#15
Patrick O Myers, Alice Bordessoule, Cécile Tissot
Serelaxin has been studied in trials in adults with acute heart failure, but not in children. We report the first compassionate use of serelaxin in an infant. A 6-month-old girl with dilated cardiomyopathy was placed on extracorporeal membrane oxygenation following cardiac arrest unresponsive to medical treatment. Extracorporeal membrane oxygenation weaning failed despite maximal ino-dilator therapy. During the 48-hour infusion of serelaxin, we observed marked improvement in brain natriuretic peptide, left ventricular systolic function, and dilatation...
January 15, 2018: Cardiology in the Young
https://www.readbyqxmd.com/read/29331959/probenecid-improves-cardiac-function-in-patients-with-heart-failure-with-reduced-ejection-fraction-in-vivo-and-cardiomyocyte-calcium-sensitivity-in-vitro
#16
Nathan Robbins, Mark Gilbert, Mohit Kumar, James W McNamara, Patrick Daly, Sheryl E Koch, Ginger Conway, Mohamed Effat, Jessica G Woo, Sakthivel Sadayappan, Jack Rubinstein
BACKGROUND: Transient receptor potential vanilloid 2 is a calcium channel activated by probenecid. Probenecid is a Food and Drug Administration-approved uricosuric drug that has recently been shown to induce positive lusitropic and inotropic effects in animal models through cardiomyocyte transient receptor potential vanilloid 2 activation. The aim of this study was to test the hypothesis that oral probenecid can improve cardiac function and symptomatology in patients with heart failure with reduced ejection fraction and to further elucidate its calcium-dependent effects on myocyte contractility...
January 13, 2018: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29331958/platelet-secretion-defects-and-acquired-von-willebrand-syndrome-in-patients-with-ventricular-assist-devices
#17
Ulrich Geisen, Kerstin Brehm, Georg Trummer, Michael Berchtold-Herz, Claudia Heilmann, Friedhelm Beyersdorf, Johannes Schelling, Axel Schlagenhauf, Barbara Zieger
BACKGROUND: The number of implanted ventricular assist devices (VADs) has increased significantly recently. Bleeding, the most frequent complication, cannot be solely attributed to anticoagulation therapy. Acquired von Willebrand syndrome (AVWS) caused by increased shear stress is frequent in VAD patients and can increase the bleeding risk. The HeartMate III (HM III) is a novel left VAD featuring potential improvements over the HeartMate II. METHODS AND RESULTS: In this study, we investigated the prevalence and onset of AVWS in 198 VAD patients...
January 13, 2018: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29331788/curcumin-inhibits-cardiac-hypertrophy-and-improves-cardiovascular-function-via-enhanced-na-ca2-exchanger-expression-after-transverse-abdominal-aortic-constriction-in-rats
#18
Xiao-Jie Bai, Jun-Tao Hao, Jin Wang, Wei-Fang Zhang, Cai-Ping Yan, Jia-Hui Zhao, Zhi-Qing Zhao
BACKGROUND: This study tested the hypothesis that inhibition of cardiac hypertrophy and preservation of cardiac/endothelial function by the natural yellow pigment curcumin are associated with upregulated expression of Na+/Ca2+ exchanger (NCX) after transverse aortic constriction (TAC). METHODS: Male Wistar rats were subjected to TAC for 10 weeks and curcumin (50 mg/kg/day) was fed by gastric gavage during TAC. Expression of NCX and endothelial nitric oxide synthase (eNOS) was analyzed by Western blot and immunohistochemistry...
July 15, 2017: Pharmacological Reports: PR
https://www.readbyqxmd.com/read/29331700/effects-of-macrophage-migration-inhibitory-factor-on-cardiac-reperfusion-injury-in-mice-with-depression-induced-by-constant-darkness
#19
Lu-Yuan Tao, Ming-Yuan Huang, Saroj-Thapa, Jiao-Ni Wang, Shao-Ze Wu, Fei He, Kai-Yu Huang, Yang-Jing Xue, Lingwei-Jin, Lian-Ming Liao, Ji-Fei Tang, Kang-Ting Ji
RATIONALE: Depression is associated with coronary artery disease and increases adverse outcomes and mortality in patients with acute myocardial infarction, but the underlying pathophysiological mechanisms remain unclear. OBJECTIVE: To evaluate the effect of macrophage migration inhibitory factor (MIF) on cardiac ischemia-reperfusion (I/R) injury in mice with constant darkness-induced depression. METHODS AND RESULTS: Twenty C57BL/6 mice (8 weeks old, male) were randomly divided into 2 groups: one group was housed in a 12h light/dark cycle environment (LD) and the other in a constant darkness environment (DD)...
December 27, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/29331650/echocardiographic-patterns-of-postresuscitation-myocardial-dysfunction
#20
Kyoung-Chul Cha, Hyung Il Kim, Oh Hyun Kim, Yong Sung Cha, Hyun Kim, Kang Hyun Lee, Sung Oh Hwang
BACKGROUND: Postresuscitation myocardial dysfunction (PRMD) can develop after successful resuscitation from cardiac arrest. However, echocardiographic patterns of PRMD remain unknown. This study aimed to investigate PRMD manifestations with serial echocardiography during the post-cardiac arrest period. METHODS: We enrolled non-traumatic out-of-hospital cardiac arrest patients older than 19 years who underwent successful cardiopulmonary resuscitation (CPR). We excluded patients with myocardial infarction or pre-existing cardiac disease, including heart failure or myocardial disease...
January 11, 2018: Resuscitation
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