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https://www.readbyqxmd.com/read/29773412/athlete-s-heart-is-the-morganroth-hypothesis-obsolete
#1
Mark J Haykowsky, T Jake Samuel, Michael D Nelson, Andre La Gerche
In 1975, Morganroth and colleagues reported that the increased left ventricular (LV) mass in highly trained endurance athletes versus nonathletes was primarily due to increased end-diastolic volume while the increased LV mass in resistance trained athletes was solely due to an increased LV wall thickness. Based on the divergent remodelling patterns observed, Morganroth and colleagues hypothesised that the increased "volume" load during endurance exercise may be similar to that which occurs in patients with mitral or aortic regurgitation while the "pressure" load associated with performing a Valsalva manoeuvre (VM) during resistance exercise may mimic the stress imposed on the heart by systemic hypertension or aortic stenosis...
May 1, 2018: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/29759615/enhancing-response-in-the-cardiac-resynchronization-therapy-patient-the-3b-perspective-bench-bits-and-bedside
#2
REVIEW
Angelo Auricchio, Frits W Prinzen
Cardiac resynchronization therapy (CRT) is an established nonpharmacological treatment for patients with heart failure (HF), reduced left ventricular (LV) ejection fraction, and a wide QRS complex. Although the therapy was developed 30 years ago and approved by the Food and Drug Administration in 2001, attempts to improve it have never stopped. Such improvements have been facilitated by combining knowledge from bench (basic science), bits (computer modeling), and bedside (clinical studies); these issues are addressed in the present review...
November 2017: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/29757371/outcomes-of-total-anomalous-pulmonary-venous-drainage-repair-in-neonates-with-univentricular-circulation
#3
Matthew S Yong, Michael Z L Zhu, Yves d'Udekem, Igor E Konstantinov
Survival after surgery for isolated total anomalous pulmonary venous drainage has improved in the current era. However, outcomes of total anomalous pulmonary venous drainage repair in patients with univentricular circulation are associated with high mortality. Furthermore, outcomes of surgery in neonates with univentricular circulation are rarely reported among larger studies. Hence, we reviewed our experience (n = 19) with this population at a single institution (between 1986 and 2015) to identify specific subgroups with high mortality...
May 10, 2018: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/29756161/risk-factors-for-failure-of-systemic-to-pulmonary-artery-shunts-in-biventricular-circulation
#4
Keti Vitanova, Cornelius Leopold, Jelena Pabst von Ohain, Cordula Wolf, Elisabeth Beran, Rüdiger Lange, Julie Cleuziou
Systemic-to-pulmonary artery shunt placement is an established palliative procedure for congenital heart disease, but it is associated with high morbidity and mortality. Data of all patients with biventricular circulation who underwent systemic-to-pulmonary artery shunt implantation between 2000 and 2016 were reviewed. Endpoints of the study were shunt failure and shunt-related mortality. Shunt failure was defined as any shunt dysfunction requiring intervention or reoperation. Shunt-related mortality was defined as death due to shunt dysfunction...
May 14, 2018: Pediatric Cardiology
https://www.readbyqxmd.com/read/29753817/arch-augmentation-via-median-sternotomy-for-coarctation-of-aorta-with-proximal-arch-hypoplasia
#5
W Hampton Gray, Winfield J Wells, Vaughn A Starnes, S Ram Kumar
BACKGROUND: Coarctation of the aorta can be associated with hypoplasia of the proximal transverse aortic arch. One approach to manage this condition is via left thoracotomy and extended end-to-end anastomosis with the expectation that the proximal arch will grow over time. Our preferred approach is to augment the aorta via midline sternotomy. We hypothesized that this approach is safe, durable and allows reliable growth of the aorta. METHODS: We identified the records of patients with biventricular anatomy who had coarctation of the aorta, hypoplasia of the proximal transverse arch, and no other cardiac lesion that would mandate cardiopulmonary bypass use and midline sternotomy...
May 10, 2018: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/29749950/a-completely-epicardial-biventricular-defibrillator-for-a-pacing-dependent-patient-with-no-superior-central-venous-access
#6
Jonathan M Behar, Shahed Islam, Ben Adams, Edward Rowland, Rakesh Uppal, Anthony Chow
No abstract text is available yet for this article.
February 2018: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/29746312/calculation-of-the-alma-risk-of-right-ventricular-failure-after-left-ventricular-assist-device-implantation
#7
Antonio Loforte, Andrea Montalto, Francesco Musumeci, Cristiano Amarelli, Carlo Mariani, Vincenzo Polizzi, Paola Lilla Della Monica, Francesco Grigioni, Roberto Di Bartolomeo, Giuseppe Marinelli
Right ventricular failure after continuous-flow left ventricular assist device (LVAD) implantation is still an unsolved issue and remains a life-threatening event for patients. We undertook this study to determine predictors of the patients who are candidates for isolated LVAD therapy as opposed to biventricular support (BVAD). We reviewed demographic, echocardiographic, hemodynamic, and laboratory variables for 258 patients who underwent both isolated LVAD implantation and unplanned BVAD because of early right ventricular failure after LVAD insertion, between 2006 and 2017 (LVAD = 170 and BVAD = 88)...
May 8, 2018: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/29744001/rapid-left-ventricular-recovery-after-correction-of-a-secundum-atrial-septal-defect-understanding-the-hemodynamics
#8
Akanksha N Thakkar, Mahwash Kassi, C Huie Lin
Closure of an atrial septal defect (ASD) may lead to a change in the function of both ventricles. Although right ventricular function typically improves, the left ventricle (LV) may behave in different ways. This has been a matter of much debate, with some authors reporting a decline in LV function after ASD closure and others reporting delayed improvement or no identifiable change. We report the case of a 41-year-old female with a large left-to-right ASD shunt (Qp:Qs 2.3:1 and shunt volume 3.6 L/min) who presented with biventricular systolic dysfunction that improved within 24 hours of ASD closure...
July 2017: Methodist DeBakey Cardiovascular Journal
https://www.readbyqxmd.com/read/29730148/mri-derived-regional-biventricular-function-in-patients-with-chronic-thromboembolic-pulmonary-hypertension-before-and-after-pulmonary-endarterectomy
#9
Sabine K Maschke, Christian O Schoenfeld, Till F Kaireit, Serghei Cebotari, Karen Olsson, Marius Hoeper, Frank Wacker, Jens Vogel-Claussen
RATIONALE AND OBJECTIVES: The aim of this study was to assess regional myocardial function in patients with chronic thromboembolic hypertension (CTEPH) before and after successful pulmonary endarterectomy (PEA) using magnetic resonance imaging. METHODS: Twenty-two patients with CTEPH underwent cardiac magnetic resonance imaging before and 12 (11, 17) days after PEA. Mean pulmonary artery pressure was evaluated preoperatively by right heart catheterization and during post-PEA intensive care unit-stay using a Swan-Ganz catheter...
May 2, 2018: Academic Radiology
https://www.readbyqxmd.com/read/29721121/acute-electrical-and-hemodynamic-effects-of-endocardial-biventricular-pacing-using-the-wise-crt-system-and-conventional-epicardial-biventricular-pacing
#10
Milena Leo, David Webster, Tim R Betts
Wireless left ventricular endocardial pacing with the WiSE CRT system has recently become available as alternative to conventional epicardial CRT pacing. We report the first comparison of the acute electrical and hemodynamic response produced by the two CRT pacing modalities in a patient undergoing WiSE CRT implant after a failed conventional CRT procedure. WiSE CRT pacing showed an additive acute benefit compared with conventional CRT. These findings could potentially translate into long-term clinical benefit and introduce the potential for tri-ventricular pacing using both systems simultaneously...
February 2018: Journal of Arrhythmia
https://www.readbyqxmd.com/read/29709363/staged-ventricular-recruitment-in-patients-with-borderline-ventricles-and-large-ventricular-septal-defects
#11
Olubunmi O Oladunjoye, Breanna Piekarski, Puja Banka, Gerald Marx, Roger E Breitbart, Pedro J Del Nido, Sitaram M Emani
OBJECTIVES: Patients with borderline ventricles and ventricular septal defects (VSDs) who have previously undergone single ventricle palliation might be candidates for staged ventricular recruitment with the ultimate goal of biventricular conversion. This study aimed to determine the effect of atrial septal defect (ASD) restriction without VSD closure on ventricular growth in patients with borderline right or left ventricles and VSDs. METHODS: Patients with borderline ventricles and VSD who underwent a staged ventricular recruitment procedure with strategies to increase blood flow through hypoplastic ventricle via ASD restriction without VSD closure after single ventricle palliation were retrospectively reviewed...
April 4, 2018: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29707843/children-with-kawasaki-disease-present-elevated-stiffness-of-great-arteries-phase-contrast-mri-study
#12
Michal Schäfer, Uyen Truong, D Dunbar Ivy, Brian Fonseca, Ladonna Malone, Michael DiMaria, Alex J Barker, Daniel Vargas, Kendall S Hunter, Pei-Ni Jone, Lorna P Browne
BACKGROUND: Patients with diagnosed Kawasaki disease (KD) are known to develop extracardiac vascular lesions and are prone to accelerated stiffening of medium-size arteries. PURPOSE: To noninvasively evaluate great vessel (central aorta and main pulmonary artery (MPA)) stiffness using phase-contrast MRI (PC-MRI). STUDY TYPE: Retrospective review. SUBJECTS: Thirty-three patients with previously diagnosed KD and 15 control subjects underwent PC-MRI evaluation...
April 29, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29707076/clinical-predictors-for-repeat-hospitalizations-in-left-ventricular-assist-device-lvad-patients-with-gastrointestinal-bleeding
#13
Charles V Welden, Wiley Truss, Gerald McGwin, Frederick Weber, Shajan Peter
Background: Patients implanted with left ventricular assist devices (LVAD) carry an increased risk of gastrointestinal bleeding (GIB), estimated at 25% in most studies. Significant efforts are employed in localizing and stopping the source of bleeding, but the rates of repeat hospitalization for GIB remain surprisingly high. Given the increasing incidence of LVAD-dependent end-stage heart failure and the excessive costs associated with repetitive endoscopic investigations, risk factors associated with re-bleeding need to be determined...
April 2018: Gastroenterology Research
https://www.readbyqxmd.com/read/29706899/development-of-the-human-placenta-and-fetal-heart-synergic-or-independent
#14
REVIEW
Graham J Burton, Eric Jauniaux
The placenta is the largest fetal organ, and toward the end of pregnancy the umbilical circulation receives at least 40% of the biventricular cardiac output. It is not surprising, therefore, that there are likely to be close haemodynamic links between the development of the placenta and the fetal heart. Development of the placenta is precocious, and in advance of that of the fetus. The placenta undergoes considerable remodeling at the end of the first trimester of pregnancy, and its vasculature is capable of adapting to environmental conditions and to variations in the blood supply received from the mother...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29700783/modeling-right-ventricle-failure-after-continuous-flow-left-ventricular-assist-device-a-biventricular-finite-element-and-lumped-parameter-analysis
#15
Francesco Scardulla, Valentina Agnese, Giuseppe Romano, Gabriele Di Gesaro, Sergio Sciacca, Diego Bellavia, Francesco Clemenza, Michele Pilato, Salvatore Pasta
The risk of right ventricle (RV) failure remains a major contraindication for continuous-flow left ventricular assist device (CF-LVAD) implantation in patients with heart failure. It is therefore critical to identify the patients who will benefit from early intervention to avoid adverse outcomes. We sought to advance the computational modeling description of the mechanisms underlying RV failure in LVAD-supported patients. RV failure was studied by computational modeling of hemodynamic and cardiac mechanics using lumped-parameter and biventricular finite element (FE) analysis...
April 26, 2018: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/29695452/ppar%C3%AE-agonist-pioglitazone-reverses-pulmonary-hypertension-and-prevents-right-heart-failure-via-fatty-acid-oxidation
#16
Ekaterina Legchenko, Philippe Chouvarine, Paul Borchert, Angeles Fernandez-Gonzalez, Erin Snay, Martin Meier, Lavinia Maegel, S Alex Mitsialis, Eva A Rog-Zielinska, Stella Kourembanas, Danny Jonigk, Georg Hansmann
Right ventricular (RV) heart failure is the leading cause of death in pulmonary arterial hypertension (PAH). Peroxisome proliferator-activated receptor γ (PPARγ) acts as a vasoprotective metabolic regulator in smooth muscle and endothelial cells; however, its role in the heart is unclear. We report that deletion of PPARγ in cardiomyocytes leads to biventricular systolic dysfunction and intramyocellular lipid accumulation in mice. In the SU5416/hypoxia (SuHx) rat model, oral treatment with the PPARγ agonist pioglitazone completely reverses severe PAH and vascular remodeling and prevents RV failure...
April 25, 2018: Science Translational Medicine
https://www.readbyqxmd.com/read/29688340/electrical-latency-predicts-the-optimal-left-ventricular-endocardial-pacing-site-results-from-a-multicentre-international-registry
#17
Benjamin J Sieniewicz, Jonathan M Behar, Manav Sohal, Justin Gould, Simon Claridge, Bradley Porter, Steve Niederer, James H P Gamble, Tim R Betts, Pierre Jais, Nicolas Derval, David D Spragg, Paul Steendijk, Berry M van Gelder, Frank A Bracke, Christopher A Rinaldi
Aims: The optimal site for biventricular endocardial (BIVENDO) pacing remains undefined. Acute haemodynamic response (AHR) is reproducible marker of left ventricular (LV) contractility, best expressed as the change in the maximum rate of LV pressure (LV-dp/dtmax), from a baseline state. We examined the relationship between factors known to impact LV contractility, whilst delivering BIVENDO pacing at a variety of LV endocardial (LVENDO) locations. Methods and results: We compiled a registry of acute LVENDO pacing studies from five international centres: Johns Hopkins-USA, Bordeaux-France, Eindhoven-The Netherlands, Oxford-United Kingdom, and Guys and St Thomas' NHS Foundation Trust, London-UK...
April 23, 2018: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/29681957/mechanical-circulatory-support-is-effective-to-treat-pulmonary-hypertension-in-heart-transplant-candidates-disqualified-due-to-unacceptable-pulmonary-vascular-resistance
#18
Michał Zakliczyński, Jerzy Pacholewicz, Izabela Copik, Marcin Maruszewski, Tomasz Hrapkowicz, Roman Przybylski, Marian Zembala
Introduction: High pulmonary vascular resistance (PVR) in orthotopic heart transplantation (OHT) candidates is a risk factor of right ventricle failure after the procedure. However, the increase of PVR may be a consequence of the life-threatening deterioration of the left ventricle function. The use of mechanical circulatory support (MCS) seems to be the best solution, but it is reimbursed only in active OHT candidates. Aim: We performed a retrospective analysis of MCS effectiveness in maintaining PVR at values accepted for OHT...
March 2018: Kardiochirurgia i Torakochirurgia Polska, Polish Journal of Cardio-Thoracic Surgery
https://www.readbyqxmd.com/read/29681368/outcomes-after-balloon-pulmonary-valvuloplasty-for-critical-pulmonary-stenosis-and-incidence-of-coronary-artery-fistulas
#19
Varun Aggarwal, Venkatachalam Mulukutla, Shiraz Maskatia, Henri Justino, Charles E Mullins, Athar M Qureshi
Outcome data for neonates with critical pulmonary stenosis (PS) is limited. We aimed to review the outcomes after balloon pulmonary valvuloplasty (BPV) for neonates with critical PS at our institution. All neonates with critical PS who underwent BPV from 1990 to 2017 were included. A total of 44 neonates underwent BPV for critical PS. Nonright ventricular dependent coronary artery fistulas was seen in 6/44 (13.6%) patients. Tricuspid valve z-scores were -1.9 (interquartile range [IQR] -3.04, -0.48) in those with coronary artery fistulas as compared with -0...
March 13, 2018: American Journal of Cardiology
https://www.readbyqxmd.com/read/29680336/cardiac-structural-and-functional-consequences-of-amyloid-deposition-by-cardiac-magnetic-resonance-and-echocardiography-and-their-prognostic-roles
#20
Daniel S Knight, Giulia Zumbo, William Barcella, Jennifer A Steeden, Vivek Muthurangu, Ana Martinez-Naharro, Thomas A Treibel, Amna Abdel-Gadir, Heerajnarain Bulluck, Tushar Kotecha, Rohin Francis, Tamer Rezk, Candida C Quarta, Carol J Whelan, Helen J Lachmann, Ashutosh D Wechalekar, Julian D Gillmore, James C Moon, Philip N Hawkins, Marianna Fontana
OBJECTIVES: This cross-sectional study aimed to describe the functional and structural cardiac abnormalities that occur across a spectrum of cardiac amyloidosis burden and to identify the strongest cardiac functional and structural prognostic predictors in amyloidosis using cardiac magnetic resonance (CMR) and echocardiography. BACKGROUND: Cardiac involvement in light chain and transthyretin amyloidosis is the main driver of prognosis and influences treatment strategies...
April 13, 2018: JACC. Cardiovascular Imaging
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