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Cardiac physiology

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https://www.readbyqxmd.com/read/28937256/evaluation-of-left-and-right-ventricular-systolic-and-diastolic-electromechanical-synchrony-in-older-people-a-population-based-observational-study
#1
R Laszlo, H Konz, K Kunz, D Dallmeier, J Klenk, M Denkinger, W Koenig, D Rothenbacher, J M Steinacker
It is unknown whether physiological ageing also goes along with electromechanical asynchrony of contraction. Aim of the study was to evaluate synchrony of contraction in older people with ("non-healthy") or without ("healthy") evidence for structural cardiac disease. In 547 persons (age 76.7+/-5.5 years, 306 male, 241 female) recruited from a population-based cohort of the ActiFE-Um study including a random sample of people >/= 65 years old living in the region of Ulm, Germany, various PW- and TDI-Doppler based markers for asynchrony were obtained by echocardiography...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28937244/cardiac-at1-receptor-dependent-and-igf1-receptor-independent-signaling-is-activated-by-a-single-bout-of-resistance-exercise
#2
S Fs Melo, V G Barauna, T Fernandes, E C Carmo, C Ro Carvalho, E M Oliveira
AT1 receptor (AT1R) blockade prevents physiological cardiac hypertrophy induced by resistance training. Also, our group showed that a single bout of resistance exercise (RE) activates the AKT/mTOR which was also inhibited by AT1R blocker. Here, we investigated whether IGF1-receptor (IGF1-R) and MAPKs were also activated after a single bout of RE. Wistar rats were divided into Sedentary (SED); Sedentary treated with losartan (SED+LOS); Exercise (EX); and Exercise treated with losartan (EX+LOS). Cardiac tissue was obtained 5 and 30 minutes after 4 sets of 12 repetitions of squat exercise (80%1RM)...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28937235/heart-rate-variability-in-newborns
#3
K Javorka, Z Lehotska, M Kozar, Z Uhrikova, B Kolarovszki, M Javorka, M Zibolen
Heart rate (HR) and heart rate variability (HRV) in newborns is influenced by genetic determinants, gestational and postnatal age, and other variables. Premature infants have a reduced HRV. In neonatal HRV evaluated by spectral analysis, a dominant activity can be found in low frequency (LF) band (combined parasympathetic and sympathetic component). During the first postnatal days the activity in the high frequency (HF) band (parasympathetic component) rises, together with an increase in LF band and total HRV...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28937038/factors-related-to-ventricular-size-and-valvular-regurgitation-in-healthy-tibetans-in-lhasa
#4
Ying Yang, Yun-Dai Chen, Bin Feng, Zha-Xi-Duo Ji, Wei Mao, Guang Zhi
BACKGROUND: Lhasa is the main residence of Tibetans and one of the highest cities in the world. Its unique geography and ethnic population provide the chance to investigate the interactions among high altitude, ethnicity, and cardiac adaptation. Meanwhile, echocardiographic data about healthy Tibetans on a large scale are not available. This study aimed to analyze physiological factors related to ventricular size and valvular function in healthy Tibetans in Lhasa. METHODS: A representative sample of residents in Tibet was recruited using a multistage cluster random sampling method...
October 5, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28936735/dual-behavior-of-exosomes-in-septic-cardiomyopathy
#5
Valter Vinícius Silva Monteiro, Jordano Ferreira Reis, Rafaelli de Souza Gomes, Kely Campos Navegantes, Marta Chagas Monteiro
Sepsis is one of the main causes of ICU hospitalization worldwide, with a high mortality rate, and is associated with a large number of comorbidities. One of the main comorbidities associated with sepsis is septic cardiomyopathy. This process occurs mainly due to mechanisms of damage in the cardiovascular system that will lead to changes in cardiovascular physiology, such as decreased Ca(2+) response, mitochondrial dysfunction and decreased β-adrenergic receptor response. Within this process the exosomes play an important role in the pathophysiology of this disease, in which the exosomal content is related to mechanisms that will trigger its development...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28936433/trpc3-channels-in-cardiac-fibrosis
#6
REVIEW
Takuro Numaga-Tomita, Sayaka Oda, Tsukasa Shimauchi, Akiyuki Nishimura, Supachoke Mangmool, Motohiro Nishida
Cardiac stiffness, caused by interstitial fibrosis due to deposition of extracellular matrix proteins, is thought as a major clinical outcome of heart failure with preserved ejection fraction (HFpEF). Canonical transient receptor potential (TRPC) subfamily proteins are components of Ca(2+)-permeable non-selective cation channels activated by receptor stimulation and mechanical stress, and have been attracted attention as a key mediator of maladaptive cardiac remodeling. How TRPC-mediated local Ca(2+) influx encodes a specific signal to induce maladaptive cardiac remodeling has been long obscure, but our recent studies suggest a pathophysiological significance of channel activity-independent function of TRPC proteins for amplifying redox signaling in heart...
2017: Frontiers in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28936179/seasonal-variations-in-heart-rate-variability-as-an-indicator-of-stress-in-free-ranging-pregnant-przewalski-s-horses-e-ferus-przewalskii-within-the-hortob%C3%A3-gy-national-park-in-hungary
#7
Friederike Pohlin, Kristin Brabender, Gerhard Fluch, Gabrielle Stalder, Thierry Petit, Chris Walzer
Background: Ecosystems with seasonal fluctuations in climate and food availability present physiological challenges to resident mammals and may cause "stress." The two predominant physiological responses to stressors are (1) the activation of the hypothalamic-pituitary-adrenal axis and (2) the modulation of the autonomic nervous system. To date, the primary indicator for "stress" in wildlife- and zoo animal research are glucocorticoid levels. By measuring the autonomic regulation of cardiac activity, particularly the vagal tone, heart rate variability (HRV) is presently emerging as a suitable indicator of "stress" in farm- and domestic animal research...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28935823/brachial-artery-vasodilatory-response-and-wall-shear-rate-determined-by-multi-gate-doppler-in-a-healthy-young-cohort
#8
Kunihiko Aizawa, Sara Sbragi, Alessandro Ramalli, Piero Tortoli, Francesco Casanova, Carmela Morizzo, Clare E Thorn, Angela C Shore, Phillip E Gates, Carlo Palombo
Wall shear rate (WSR) is an important stimulus for the brachial artery flow-mediated dilation (FMD) response. However, WSR estimation near the arterial wall by conventional Doppler is inherently difficult. To overcome this limitation, we utilised multi-gate Doppler to accurately determine the WSR stimulus near the vessel wall simultaneously with the FMD response using an integrated FMD system [Ultrasound Advanced Open Platform (ULA-OP)]. Using the system, we aimed to perform a detailed analysis of WSR-FMD response and establish novel WSR parameters in a healthy young population...
September 21, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28935040/cardiopulmonary-exercise-testing-what-is-its-value
#9
REVIEW
Marco Guazzi, Francesco Bandera, Cemal Ozemek, David Systrom, Ross Arena
Compared with traditional exercise tests, cardiopulmonary exercise testing (CPET) provides a thorough assessment of exercise integrative physiology involving the pulmonary, cardiovascular, muscular, and cellular oxidative systems. Due to the prognostic ability of key variables, CPET applications in cardiology have grown impressively to include all forms of exercise intolerance, with a predominant focus on heart failure with reduced or with preserved ejection fraction. As impaired cardiac output and peripheral oxygen diffusion are the main determinants of the abnormal functional response in cardiac patients, invasive CPET has gained new popularity, especially for diagnosing early heart failure with preserved ejection fraction and exercise-induced pulmonary hypertension...
September 26, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28934640/continuous-longitudinal-infusion-of-rhigf-1-rhigfbp-3-in-extremely-preterm-infants-evaluation-of-feasibility-in-a-phase-ii-study
#10
Ingrid Hansen-Pupp, Ann Hellström, Mohamed Hamdani, Adina Tocoian, Nerissa C Kreher, David Ley, Boubou Hallberg
OBJECTIVE: To evaluate the feasibility of continuous longitudinal intravenous infusion of recombinant human insulin-like growth factor-1/recombinant human insulin-like growth factor binding protein-3 (rhIGF-1/rhIGFBP-3) for prevention of retinopathy of prematurity and other complications in extremely preterm infants (<28weeks' gestational age), based on initial sections of a phase II randomized controlled trial. DESIGN: The phase II trial was designed in four sections (A-D); we report pharmacokinetic and adverse events (AEs) data pooled for Sections B and C...
August 31, 2017: Growth Hormone & IGF Research
https://www.readbyqxmd.com/read/28934587/aging-in-the-cardiovascular-system-lessons-from-hutchinson-gilford-progeria-syndrome
#11
Magda R Hamczyk, Lara Del Campo, Vicente Andrés
Aging, the main risk factor for cardiovascular disease (CVD), is becoming progressively more prevalent in our societies. A better understanding of how aging promotes CVD is therefore urgently needed to develop new strategies to reduce disease burden. Atherosclerosis and heart failure contribute significantly to age-associated CVD-related morbimortality. CVD and aging are both accelerated in patients suffering from Hutchinson-Gilford progeria syndrome (HGPS), a rare genetic disorder caused by the prelamin A mutant progerin...
September 20, 2017: Annual Review of Physiology
https://www.readbyqxmd.com/read/28930917/shock-2017-military-supplement-an-overview-of-two-human-trials-of-perfluorocarbon-emulsions-in-non-cardiac-surgery
#12
Donat R Spahn, Peter E Keipert
Perfluorochemicals (PFCs) constitute one class of artificial oxygen carriers that are being produced completely synthetically. One formulation that has been evaluated extensively in clinical trials is a 60% w/v perflubron-based emulsion. Efficacy and safety of this perflubron emulsion was evaluated in a Phase 2 and a large prospective randomized Phase 3 multicenter European study, which collectively included a total of 639 patients. Perflubron emulsion was highly successful in improving organ function, reversing physiologic transfusion triggers and in reducing the need for allogeneic blood transfusions...
September 19, 2017: Shock
https://www.readbyqxmd.com/read/28928613/clarifying-the-anatomy-and-physiology-of-totally-anomalous-systemic-venous-connection
#13
REVIEW
Saurabh Kumar Gupta, Rajnish Juneja, Robert H Anderson, Gurpreet S Gulati, Velayoudam Devagorou
The description of totally anomalous systemic venous connection is limited to case reports. In this review, we seek to clarify anatomic, physiologic, and hemodynamic aspects of this extremely rare anomaly. We also present findings of two patients in whom connection of all the systemic veins was anomalous. In the first patient, with usual atrial arrangement, all systemic veins, including the coronary sinus, were connected anomalously to the morphologically left atrium. Limited left-to-right shunt across an atrial septal defect provided the only source of blood flow to the lungs...
September 2017: Annals of Pediatric Cardiology
https://www.readbyqxmd.com/read/28928608/intraocular-pressure-in-children-after-congenital-heart-surgery-a-single-center-study
#14
Sunali Goyal, Paul H Phillips, Lamonda A Corder, Michael J Robertson, Xiomara Garcia, Michael L Schmitz, Punkaj Gupta
BACKGROUND: The impact of varied cardiac physiologies on intraocular pressure (IOP) among children undergoing heart operations is unknown. AIM: The aim of this study was to determine the IOP among children with varying cardiovascular physiologies and varying hemodynamics after their heart operation. SETTING AND DESIGN: This was a prospective, observational study. MATERIALS AND METHODS: Patients ≤18 years undergoing congenital heart surgery were included in this study...
September 2017: Annals of Pediatric Cardiology
https://www.readbyqxmd.com/read/28928113/pdk4-inhibits-cardiac-pyruvate-oxidation-in-late-pregnancy
#15
Laura Liu, Glenn C Rowe, Steven Yang, Jian Li, Federico Damilano, Mun Chun Chan, Wenyun Lu, Cholsoon Jang, Shogo Wada, Michael Morley, Michael Hesse, Bernd K Fleischmann, Joshua Rabinowitz, Saumya Das, Anthony Rosenzweig, Zoltan Arany
Rationale: Pregnancy profoundly alters maternal physiology. The heart hypertrophies during pregnancy, but its metabolic adaptations are not well understood. Objective: To determine the mechanisms underlying cardiac substrate use during pregnancy. Methods and Results: We use here (13)C-glucose, (13)C-lactate, and (13)C-fatty acid tracing analyses to show that hearts in late pregnant mice increase fatty acid uptake and oxidation into the tricarboxylic acid (TCA) cycle, while reducing glucose and lactate oxidation...
September 19, 2017: Circulation Research
https://www.readbyqxmd.com/read/28928069/comments-on-the-new-international-criteria-for-electrocardiographic-interpretation-in-athletes
#16
Luis Serratosa-Fernández, Domingo Pascual-Figal, María Dolores Masiá-Mondéjar, María Sanz-de la Garza, Zigor Madaria-Marijuan, Juan Ramón Gimeno-Blanes, Carmen Adamuz
Sudden cardiac death is the most common medical cause of death during the practice of sports. Several structural and electrical cardiac conditions are associated with sudden cardiac death in athletes, most of them showing abnormal findings on resting electrocardiogram (ECG). However, because of the similarity between some ECG findings associated with physiological adaptations to exercise training and those of certain cardiac conditions, ECG interpretation in athletes is often challenging. Other factors related to ECG findings are race, age, sex, sports discipline, training intensity, and athletic background...
September 16, 2017: Revista Española de Cardiología
https://www.readbyqxmd.com/read/28927226/female-clock%C3%AE-19-%C3%AE-19-mice-are-protected-from-the-development-of-age-dependent-cardiomyopathy
#17
Faisal J Alibhai, Cristine J Reitz, Willem T Peppler, Poulami Basu, Paul Sheppard, Elena Choleris, Marica Bakovic, Tami A Martino
Aims: Circadian rhythms are important for healthy cardiovascular physiology and they are regulated by the molecular circadian mechanism. Previously, we showed that disruption of the circadian mechanism factor CLOCK in male Clock Δ19/Δ19 mice led to development of age-dependent cardiomyopathy. Here, we investigate the role of biological sex in protecting against heart disease in aging female Clock Δ19/Δ19 mice. Methods and results: Female Clock Δ19/Δ19 mice are protected from the development of cardiomyopathy with age, as heart structure and function are similar to 18 months of age versus female WT mice...
September 12, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28927173/the-relationship-between-preoperative-frailty-and-outcomes-following-transcatheter-aortic-valve-implantation-a-systematic-review-and-meta-analysis
#18
Atul Anand, Catherine Harley, Akila Visvanathan, Anoop S V Shah, Joanna Cowell, Alasdair MacLullich, Susan Shenkin, Nicholas L Mills
Aims: Transcatheter aortic valve implantation (TAVI) is an increasingly common intervention for patients with aortic stenosis deemed high risk for major cardiac surgery, but identifying those who will benefit can be challenging. Frailty reflects physiological reserve and may be a useful prognostic marker in this population. We performed a systematic review and meta-analysis of the association between frailty and outcomes after TAVI. Methods and Results: Five databases were searched between January 2000 and May 2015...
April 1, 2017: European Heart Journal. Quality of Care & Clinical Outcomes
https://www.readbyqxmd.com/read/28926329/postoperative-haematocrit-and-outcome-in-critically-ill-surgical-patients
#19
Ana Martins Lopes, Diana Silva, Gabriela Sousa, Joana Silva, Alice Santos, Fernando José Abelha
INTRODUCTION: Haematocrit has been studied as an outcome predictor. The aim of this study was to evaluate the correlation between low haematocrit at surgical intensive care unit admission and high disease scoring system score and early outcomes. MATERIAL AND METHODS: This retrospective study included 4398 patients admitted to the surgical intensive care unit between January 2006 and July 2013. Acute physiology and chronic health evaluation and simplified acute physiology score II values were calculated and all variables entered as parameters were evaluated independently...
August 31, 2017: Acta Médica Portuguesa
https://www.readbyqxmd.com/read/28925857/comparison-of-stored-red-blood-cell-washing-techniques-for-priming-extracorporeal-circuits
#20
Jun Sasaki, Christopher Tirotta, Hyunsoo Lim, Kathleen Kubes, Jane Salvaggio, Robert Hannan, Redmond Burke, Jorge Ojito
BACKGROUND: The aim of this study was to compare three different blood washing techniques and describe the differences for the composition of the washed red blood cells (RBC). METHODS: Stored RBCs less than 5 days old were washed using three different techniques. 1) Washing with normal saline with the COBE Model 2991 blood processor in the blood bank (BB-S). 2) Washing with normal saline with the Continuous AutoTransfusion System (C.A.T.S) in the operating room (OR-S)...
September 1, 2017: Perfusion
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