keyword
MENU ▼
Read by QxMD icon Read
search

Premature contraction

keyword
https://www.readbyqxmd.com/read/28431063/left-ventricular-dysfunction-is-associated-with-frequent-premature-ventricular-complexes-and-asymptomatic-ventricular-tachycardia-in-children
#1
R A Bertels, L M Harteveld, L H Filippini, S A Clur, N A Blom
Aims: To assess the risk factors for left ventricular (LV) dysfunction in a paediatric population with idiopathic frequent premature ventricular contractions (PVCs) and asymptomatic ventricular tachycardias (VTs). Methods and Results: Paediatric patients with the diagnosis of idiopathic frequent PVCs and asymptomatic VTs were retrospectively evaluated. Frequent PVCs were defined as ≥5% on 24 h Holter recording. Left ventricular dysfunction was defined as a shortening fraction of ≤28%...
April 1, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28426463/treatments-for-achalasia-in-2017-how-to-choose-among-them
#2
Peter J Kahrilas, John E Pandolfino
PURPOSE OF REVIEW: To review recent advances in achalasia diagnostics and therapeutics. RECENT FINDINGS: The cardinal feature of achalasia, impaired lower esophageal sphincter (LES) relaxation, can occur in association with varied patterns of esophageal contractility. The Chicago Classification distinguishes among these as follows: without contractility (type I), with panesophageal pressurization (type II), with premature (spastic) distal esophageal contractions (type III), or even with preserved peristalsis [esophagogastric junction (EGJ) outlet obstruction]...
April 19, 2017: Current Opinion in Gastroenterology
https://www.readbyqxmd.com/read/28423971/intrauterine-infection-immune-system-and-premature-birth
#3
Fernanda Rodrigues Helmo, Eduardo Arthur Rodovalho Alves, Renata Alves de Andrade Moreira, Viviane Oliveira Severino, Laura Penna Rocha, Maria Luíza Gonçalves Dos Reis Monteiro, Marlene Antônia Dos Reis, Renata Margarida Etchebehere, Juliana Reis Machado, Rosana Rosa Miranda Corrêa
Preterm birth accounts for nearly one million deaths among children under five years of age, and although its etiopathogenesis is not fully elucidated, ascending intrauterine infection and fetal inflammatory response seem to be the main triggers. The intense inflammatory response mediated by IL-1β, TNF-α, PAF, IFN-γ and IL-6, PGE2 and MMP-1 and MMP-9 causes fetal membrane damage and rupture, increased uterine contractions and biochemical and structural changes in the cervix. Furthermore, preterm neonates have deficient innate and adaptive immune responses characterized by reduced levels of IgG, opsonization and phagocytosis, as well as increased activation of Th1 cells in relation to Th2 cells...
April 20, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28422337/in-vivo-validation-of-a-novel-algorithm-for-automatic-premature-ventricular-contractions-recognition
#4
Jedrzej Kosiuk, Guilherme Portugal, Sebastian Hilbert, Silke John, Mario Oliveira, Gerhard Hindricks, Andreas Bollmann
INTRODUCTION: Template-matching algorithms are routinely used in the catheter ablation of patients with premature ventricular contractions (PVCs). However, systematic analysis of the accuracy and spatial resolution of such systems is lacking. Therefore, the aim of this evaluation was to perform a systematic in-vivo validation of performance of a novel automated template-matching algorithm. METHODS AND RESULTS: In a porcine model, paced beats simulating PVCs from different origins were investigated...
April 19, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28418103/neurogenic-and-myogenic-patterns-of-electrical-activity-in-isolated-intact-mouse-colon
#5
T J Hibberd, M Costa, L Travis, S J H Brookes, D A Wattchow, J Feng, H Hu, N J Spencer
BACKGROUND: Relatively little is known about the electrical rhythmicity of the whole colon, where long neural pathways are preserved. METHODS: Smooth muscle electrical activity was recorded extracellularly from the serosa of isolated flat-sheet preparations consisting of the whole mouse colon (n=31). KEY RESULTS: Two distinct electrical patterns were observed. The first, long intense spike bursts, occurred every 349±256 seconds (0.2±0.2 cpm), firing action potentials for 31±11 seconds at 2...
April 18, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28412086/tocolysis-after-preterm-premature-rupture-of-membranes-and-neonatal-outcome-a-propensity-score-analysis
#6
Elsa Lorthe, François Goffinet, Stéphane Marret, Christophe Vayssiere, Cyril Flamant, Mathilde Quere, Valérie Benhammou, Pierre-Yves Ancel, Gilles Kayem
BACKGROUND: There are conflicting results regarding tocolysis in cases of preterm premature rupture of membranes. Delaying delivery may reduce neonatal morbidity due to prematurity, allow for prenatal corticosteroids and, if necessary, in utero transfer. However, that may increase risks of maternofetal infection and its adverse consequences. OBJECTIVE: To investigate whether tocolytic therapy in cases of preterm premature rupture of membranes is associated with improved neonatal or obstetric outcomes...
April 12, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28408652/premature-ventricular-contraction-coupling-interval-variability-destabilizes-cardiac-neuronal-and-electrophysiological-control-insights-from-simultaneous-cardioneural-mapping
#7
David Hamon, Pradeep S Rajendran, Ray W Chui, Olujimi A Ajijola, Tadanobu Irie, Ramin Talebi, Siamak Salavatian, Marmar Vaseghi, Jason S Bradfield, J Andrew Armour, Jeffrey L Ardell, Kalyanam Shivkumar
BACKGROUND: Variability in premature ventricular contraction (PVC) coupling interval (CI) increases the risk of cardiomyopathy and sudden death. The autonomic nervous system regulates cardiac electrical and mechanical indices, and its dysregulation plays an important role in cardiac disease pathogenesis. The impact of PVCs on the intrinsic cardiac nervous system, a neural network on the heart, remains unknown. The objective was to determine the effect of PVCs and CI on intrinsic cardiac nervous system function in generating cardiac neuronal and electric instability using a novel cardioneural mapping approach...
April 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/28408160/physical-training-promotes-similar-effects-to-the-blockade-of-angiotensin-converting-enzyme-on-the-cardiac-morphology-and-function-in-old-female-rats-subjected-to-premature-ovarian-failure
#8
Ana Carolina S Felix, Sabrina G V Dutra, Ada C Gastaldi, Pâmela C Bonfim, Suenimeire Vieira, Hugo Celso Dutra de Souza
We investigated the effects of angiotensin-converting enzyme (ACE) inhibition and aerobic physical training on the heart of old female rats (82-wk-old) submitted to premature ovarian failure (10-wk.-old). We used different approaches: morphology and function by echocardiography, reactivity of the coronary bed and left ventricular contractibility (Langendorff Technique). Female Wistar ovariectomized (OVX) rats (n=42) were assigned to one of four groups: OVX, vehicle treated only; OVX-EM, Enalapril Maleate only (EM, 10mg·kg(-1)·d(-1)); OVX-T, aerobic trained only; and OVX-EMT, treated with Enalapril Maleate and aerobic trained...
April 10, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28403080/characteristics-of-diurnal-ventricular-premature-complex-variation-in-right-ventricular-outflow-tract-arrhythmias-after-catheter-ablation
#9
Shih-Jie Jhuo, Li-Wei Lo, Shih-Lin Chang, Yenn-Jiang Lin, Fa-Po Chung, Yu-Feng Hu, Tze-Fan Chao, Ta-Chuan Tuan, Jo-Nan Liao, Chin-Yu Lin, Yao-Ting Chang, Chung-Hsing Lin, Rohit Walia, Abigail Louise D Te, Shinya Yamada, Sunu Budhi Raharjo, Wei-Hua Tang, Kun-Tai Lee, Wen-Ter Lai, Shih-Ann Chen
Diurnal variations in ventricular tachyarrhythmias (VAs) have been demonstrated in idiopathic arrhythmogenic heart disease. The electrophysiological characteristics of diurnal variations in idiopathic right ventricular outflow tract (RVOT) VA have not previously been elucidated. Sixty-two consecutive patients undergoing catheter ablation for idiopathic RVOT VA (mean age: 42.8 ± 12.3 years, 35 females) were enrolled. The diurnal variation type (group 1, n = 36) was defined as those patients who had most ventricular premature contractions (VPCs) during the night hours by preprocedure Holter recordings...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28396041/association-of-holter-derived-heart-rate-variability-parameters-with-the-development-of-congestive-heart-failure-in-the-cardiovascular-health-study
#10
Vaiibhav N Patel, Brian R Pierce, Rohan K Bodapati, David L Brown, Diane G Ives, Phyllis K Stein
OBJECTIVES: This study sought to determine whether Holter-based parameters of heart rate variability (HRV) are independently associated with incident heart failure among older adults in the CHS (Cardiovascular Health Study) as evidenced by an improvement in the predictive power of the Health Aging and Body Composition Heart Failure (Health ABC) score. BACKGROUND: Abnormal HRV, a marker of autonomic dysfunction, has been associated with multiple adverse cardiovascular outcomes but not the development of congestive heart failure (CHF)...
March 30, 2017: JACC. Heart Failure
https://www.readbyqxmd.com/read/28392116/carotid-dissection-complicated-by-polymorphic-ventricular-tachycardia
#11
Bria D Giacomino, Michael C Giudici
In this case report, we describe a patient with fibromuscular dysplasia who suffered spontaneous bilateral carotid artery dissections. This was followed by significant variations in blood pressure and heart rates during her admission. Unfortunately, during an episode of bradycardia, a premature ventricular contraction occurred during the T wave which resulted in polymorphic ventricular tachycardia. As described in the case and in graphic depiction, this hemodynamic instability resolved after stenting of the carotid artery...
April 5, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28384492/contractile-force-generation-by-3d-hipsc-derived-cardiac-tissues-is-enhanced-by-rapid-establishment-of-cellular-interconnection-in-matrix-with-muscle-mimicking-stiffness
#12
Soah Lee, Vahid Serpooshan, Xinming Tong, Sneha Venkatraman, Meelim Lee, Jaecheol Lee, Orlando Chirikian, Joseph C Wu, Sean M Wu, Fan Yang
Engineering 3D human cardiac tissues is of great importance for therapeutic and pharmaceutical applications. As cardiac tissue substitutes, extracellular matrix-derived hydrogels have been widely explored. However, they exhibit premature degradation and their stiffness is often orders of magnitude lower than that of native cardiac tissue. There are no reports on establishing interconnected cardiomyocytes in 3D hydrogels at physiologically-relevant cell density and matrix stiffness. Here we bioengineer human cardiac microtissues by encapsulating human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) in chemically-crosslinked gelatin hydrogels (1...
March 30, 2017: Biomaterials
https://www.readbyqxmd.com/read/28367337/premature-ventricular-complex-causing-ice-pick-headache
#13
Selcuk Ozturk, Ertan Yetkin
Ice pick headache is a momentary, transient, repetitive headache disorder and manifests with the stabbing pains and jolts. The exact mechanism causing this disease is unknown. Premature ventricular contractions are early depolarization of the ventricular myocardium and in the absence of a structural heart disease, it is considered to be a benign disease. In this report, we describe a male patient presenting with the symptom of momentary headache attacks accompanied with instant chest pain which is associated with premature ventricular contraction...
2017: Case Reports in Cardiology
https://www.readbyqxmd.com/read/28343798/assessment-of-a-novel-transdermal-selective-%C3%AE-1-blocker-the-bisoprolol-patch-for-treating-frequent-premature-ventricular-contractions-in-patients-without-structural-heart-disease
#14
Masaya Shinohara, Tadashi Fujino, Hideki Koike, Ken Kitahara, Toshio Kinoshita, Hitomi Yuzawa, Takeya Suzuki, Shunji Fukunaga, Kenzaburo Kobayashi, Jiro Aoki, Kengo Tanabe, Takanori Ikeda
BACKGROUND: The autonomic nervous system involves the genesis of premature ventricular contractions (PVCs). Previous studies demonstrated that heart rate (HR) dependency of idiopathic PVCs has different autonomic mechanisms. Recently, the bisoprolol patch, a novel transdermal β1-blocker formulation containing bisoprolol, became clinically available. We examined the efficacy of the bisoprolol patch for treating frequent PVCs in patients without structural heart disease (SHD) regarding the HR dependency of PVCs...
March 23, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/28337151/a-reduction-in-maximal-incremental-exercise-test-duration-48-h-post-downhill-run-is-associated-with-muscle-damage-derived-exercise-induced-pain
#15
Bryna C R Chrismas, Lee Taylor, Jason C Siegler, Adrian W Midgley
Purpose: To examine whether exercise induced muscle damage (EIMD) and muscle soreness reduce treadmill maximal incremental exercise (MIE) test duration, and true maximal physiological performance as a consequence of exercise induced pain (EIP) and perceived effort. Methods: Fifty (14 female), apparently healthy participants randomly allocated into a control group (CON, n = 10), or experimental group (EXP, n = 40) visited the laboratory a total of six times: visit 1 (familiarization), visit 2 (pre 1), visit 3 (pre 2), visit 4 (intervention), visit 5 (24 h post) and visit 6 (48 h post)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28336205/andersen-tawil-syndrome-clinical-presentation-and-predictors-of-symptomatic-arrhythmias-possible-role-of-polymorphisms-k897t-in-kcnh2-and-h558r-in-scn5a-gene
#16
Michalina Krych, Elżbieta Katarzyna Biernacka, Joanna Ponińska, Piotr Kukla, Artur Filipecki, Robert Gajda, Can Hasdemir, Charles Antzelevitch, Agnieszka Kosiec, Małgorzata Szperl, Rafał Płoski, Maria Trusz-Gluza, Katarzyna Mizia-Stec, Piotr Hoffman
BACKGROUND: Andersen-Tawil syndrome (ATS) is rare channelopathy caused by KCNJ2 mutation and probably KCNJ5. It is characterized by arrhythmias, neurological symptoms, and dysmorphic features. The present study retrospectively examined the characteristics of 11 unrelated families with ATS. METHODS: This study consisted of 11 probands positive for KCNJ2 variants and 33 family members (mean age 30.0±17.3 years, female n=31). Additional genetic screening of 3 LQTS genes (KCNQ1, KCNH2, SCN5A) was performed in 9 families...
March 20, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/28297039/reactivation-of-retinopathy-of-prematurity-three-years-after-treatment-with-bevacizumab
#17
Amir R Hajrasouliha, Jose M Garcia-Gonzales, Michael J Shapiro, Hawke Yoon, Michael P Blair
Although intravitreal injection of anti-vascular endothelial growth factor agents (IVA) can induce rapid regression of retinopathy of prematurity (ROP), late reactivation of the ROP can occur in the form of tractional retinal detachment (TRD) from contracted recurrent extraretinal fibrovascular proliferation. The authors report a case of bilateral TRD for recurrent ROP in a 3-year-old, which is the latest-reported reactivation to date. The authors propose that persistent avascular retina in eyes that have undergone IVA for ROP receive laser ablation to prevent late recurrences...
March 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28262259/diagnostical-mistakes-in-ablation-procedures-associated-with-a-high-placement-of-the-leads-v1-v3
#18
Damián Longo, Claudio Poliserpi, Francisco Toscano Quilon, Pedro Díaz Uberti, Carlos López, Javier García-Niebla, Irma Ramella
The misplacement of electrodes for surface electrocardiogram (ECG) recording that we use daily as a reference for mapping precise locations in invasive procedures may, besides inducing diagnostical mistakes, greatly increase the duration of the procedure and making more feasible the incidence of complications, especially in ablation of arrhythmic substrates of ventricular outflow tracts such as premature ventricular contractions (PVC's) and accessory pathways, if the right precordial electrodes (V1-V3) are higher positioned...
February 20, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28257155/surgical-retrieval-of-a-guide-wire-lost-during-central-venous-catheterization-in-a-dog
#19
Jade M Hardy, Jennifer L Lansdowne, Carol A Himsel, Sean R Freer
OBJECTIVE: To report a case of successful surgical removal of a guide wire lost during central venous catheterization. CASE SUMMARY: A 28 kg, 4-year-old female neutered mixed breed dog presented to the primary care veterinarian with diabetic ketosis. During the process of central venous catheterization, the guide wire was accidently released and the entire length of the guide wire slipped into the jugular vein. Due to the absence of nearby interventional radiology facilities, surgical intervention was proposed...
March 3, 2017: Journal of Veterinary Emergency and Critical Care
https://www.readbyqxmd.com/read/28255011/ranolazine-prevents-phenotype-development-in-a-mouse-model-of-hypertrophic-cardiomyopathy
#20
Raffaele Coppini, Luca Mazzoni, Cecilia Ferrantini, Francesca Gentile, Josè Manuel Pioner, Tina Laurino, Lorenzo Santini, Valentina Bargelli, Matteo Rotellini, Gianluca Bartolucci, Claudia Crocini, Leonardo Sacconi, Chiara Tesi, Luiz Belardinelli, Jil Tardiff, Alessandro Mugelli, Iacopo Olivotto, Elisabetta Cerbai, Corrado Poggesi
BACKGROUND: Current therapies are ineffective in preventing the development of cardiac phenotype in young carriers of mutations associated with hypertrophic cardiomyopathy (HCM). Ranolazine, a late Na(+) current blocker, reduced the electromechanical dysfunction of human HCM myocardium in vitro. METHODS AND RESULTS: To test whether long-term treatment prevents cardiomyopathy in vivo, transgenic mice harboring the R92Q troponin-T mutation and wild-type littermates received an oral lifelong treatment with ranolazine and were compared with age-matched vehicle-treated animals...
March 2017: Circulation. Heart Failure
keyword
keyword
80144
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"