keyword
MENU ▼
Read by QxMD icon Read
search

preload

keyword
https://www.readbyqxmd.com/read/28550173/experimental-cardiac-radiation-exposure-induces-ventricular-diastolic-dysfunction-with-preserved-ejection-fraction
#1
Hirofumi Saiki, Gilles Moulay, Adam J Guenzel, Weibin Liu, Teresa Decklever, Kelly Classic, Linh Pham, Horng H Chen, John C Burnett, Stephen J Russell, Margaret M Redfield
BACKGROUND: Breast cancer radiotherapy increases the risk of heart failure (HF) with preserved ejection fraction (HFpEF). Cardiomyocytes are highly radio-resistant but radiation specifically affects coronary microvascular endothelial cells with subsequent microvascular inflammation and rarefaction. The effects of radiation on left ventricular (LV) diastolic function are poorly characterized. We hypothesized that cardiac radiation exposure may result in diastolic dysfunction without reduced EF...
May 26, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28543923/sex-differences-in-fitness-and-cardiac-function-during-exercise-in-adolescents-with-chronic-fatigue
#2
Paolo T Pianosi, Eric Emerling, Kristin C Mara, Amy L Weaver, Philip R Fischer
Females demonstrate less robust Frank-Starling mechanism with respect to cardiac preload than males at rest. We asked whether this phenomenon would also affect cardiac performance during exercise. We hypothesized that stroke volume (SV) response to exercise would be more limited in deconditioned females such that cardiac output would be mainly rate dependent, compared with males. We conducted a chart audit of clinical exercise tests performed by adolescents with chronic fatigue. Oxygen uptake (VO2 ) was measured breath-by-breath at rest and during cycle ergometry, while cardiac output was measured by acetylene rebreathing at rest plus 2-3 sub-threshold workloads...
May 24, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28538593/dynamic-response-of-the-lumbar-spine-to-whole-body-vibration-under-a-compressive-follower-preload
#3
Li-Xin Guo, Wei Fan
STUDY DESIGN: A finite element study of dynamic response of the lumbar spine to whole-body vibration. OBJECTIVE: To develop and validate a finite element model for exploring the impact of whole-body vibration on the entire lumbar spine with a compressive follower preload applied. SUMMARY OF BACKGROUND DATA: Several finite element studies have investigated the biodynamic characteristics of the human lumbar spine when exposed to whole-body vibration...
May 22, 2017: Spine
https://www.readbyqxmd.com/read/28537997/where-are-we-heading-with-fluid-responsiveness-research
#4
Simon T Vistisen, Peter Juhl-Olsen
PURPOSE OF REVIEW: Fluid responsiveness prediction is not always possible with well established dynamic approaches such as passive leg raising or pulse pressure variation in the ICU. The purpose of the present review is to summarize emerging alternative techniques for fluid responsiveness prediction in adult critically ill patients and discuss their methodology and applicability. In addition, the future role of fluid responsiveness prediction in the ICU is discussed. RECENT FINDINGS: Several new dynamic techniques have been investigated and they all contribute to the applicability of fluid responsiveness techniques...
May 22, 2017: Current Opinion in Critical Care
https://www.readbyqxmd.com/read/28534558/-proposing-a-physiological-model-for-emergency-department-operating-principles-classification-of-overcrowding-and-guidelines-for-redesign
#5
M Herrera Carranza, F Aguado Correa, N Padilla Garrido, F López Camacho
The operation of Emergency Departments (ED) is determined by demand, their own organizational structures and the connection to other medical care levels. When these elements are not simultaneous, it hinders patient flow and decreases capacity, making it necessary to employ a systemic approach to the chain of emergency care as a single operational entity. With this theoretical orientation, we suggest a conceptual model similar to the physiological cardiac output, in which the preload is the demand, the contractile or flow pump is the organizational structure, the afterload is the hospital, the pre-ED valve is primary care and outpatient emergencies, and the post-ED valve is the diagnostic support services and the specialist consultants...
April 30, 2017: Anales del Sistema Sanitario de Navarra
https://www.readbyqxmd.com/read/28533073/the-impact-of-sevoflurane-on-coupling-of-the-left-ventricular-to-systemic-vasculature-in-rats-with-chronic-pulmonary-hypertension
#6
Lu Wang, Hui Luo, Gang Qin, Yanan Cao, Xiaowei Gao, Zhong Zhang, Zhi Ye, Junjie Zhang, Qulian Guo, E Wang
OBJECTIVES: The relationship between left ventricular function and afterload has not been investigated as much as the right ventricular function under chronic pulmonary hypertension (PH) during anesthesia. This study was designed to investigate effects of sevoflurane on the intrinsic coupling relationship between the left ventricle and systemic vasculature in the presence of PH. DESIGN: A randomized, controlled study. SETTING: University hospital...
February 13, 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/28532943/evaluation-of-preloaded-intraocular-lens-injection-systems-ex%C3%A2-vivo-study
#7
Mayank A Nanavaty, Magdalena Kubrak-Kisza
PURPOSE: To compare preloaded intraocular lens (IOL) injection systems. SETTING: Sussex Eye Hospital, Brighton, United Kingdom. DESIGN: Experimental study. METHODS: In 30 porcine eyes, 5 preloaded +22.0 diopters IOLs were implanted from each of the following preloaded IOL systems: Ultrasert (U), iTec (iT), Eyecee (E), iSert (iS), Rayone (R), and CT Lucia (CT). External and internal wound size was measured. Nozzle damage was assessed using digital photography...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28528579/phosphodiesterase-type-5-inhibition-may-reduce-diastolic-function-in-women-with-ischemia-but-no-obstructive-coronary-artery-disease
#8
Michael D Nelson, Puja K Mehta, Janet Wei, Behzad Sharif, Louise E J Thomson, Daniel Berman, Debiao Li, C Noel Bairey Merz
BACKGROUND: Ischemia, in the absence of obstructive coronary artery disease, is prevalent in women, and associated with increased risk for major cardiovascular events. Coronary microvascular dysfunction is prevalent in these patients, and associated with impaired diastolic function. Despite our general understanding, however, optimal treatment of this cohort remains elusive. METHODS: To address this knowledge gap, we performed an open-label treatment trial to assess whether phosphodiesterase type 5 inhibition improves coronary microvascular perfusion and diastolic function in women with signs and symptoms of ischemia but no evidence of obstructive coronary artery disease...
May 22, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28522275/impact-of-continuous-positive-airway-pressure-on-left-ventricular-systolic-loading-and-coronary-flow-reserve-in-healthy-young-men
#9
Volker Schulze, Christian Meyer, Christian Eickholt, Roberto Sansone, Stefanie Keymel, Christian Heiss, Tienush Rassaf, Malte Kelm, Stephan Steiner
BACKGROUND: Increased augmentation index (AIx) is accompanied by an elevated cardiovascular risk. A reduction of AIx is known for long-term continuous positive airway pressure (CPAP) therapy. We hypothesised that acute preload and left ventricular workload effects AIx and subendocardial viability ratio (SEVR) as a marker of coronary flow reserve. METHODS: Increased augmentation index and central blood pressure parameters were measured by radial artery tonometry in 17 healthy men (32/±6years) at rest and during CPAP ventilation at pressures of 5, 10mbar and after recovery...
March 31, 2017: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/28520458/anchored-transosseous-equivalent-versus-anchorless-transosseous-rotator-cuff-repair-a-biomechanical-analysis-in-a-cadaveric-model
#10
Kelly G Kilcoyne, Stanley G Guillaume, Catherine V Hannan, Evan R Langdale, Stephen M Belkoff, Uma Srikumaran
BACKGROUND: The original approach for the repair of torn rotator cuffs involved an open technique with sutures passing through the greater tuberosity and tendon. The development of suture anchors allowed for an all-arthroscopic approach with anchor configurations attempting to re-create a transosseous fixation pattern. Presently, an arthroscopic approach can be combined with a transosseous suture configuration without using anchors. PURPOSE: To evaluate cyclic loading, ultimate load to failure, and the failure mechanisms of transosseous-equivalent (TOE) repair with anchors and anchorless transosseous (AT) repair of rotator cuff tears...
May 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28511121/influence-of-different-frequencies-of-axial-cyclic-loading-on-time-domain-vibration-response-of-the-lumbar-spine-a-finite-element-study
#11
Wei Fan, Li-Xin Guo
Very few studies have quantitatively analyzed influence of the loading frequency on time-domain vibration response of the whole lumbar spine in the presence of a physiologic compressive preload. In this study, a three-dimensional non-linear finite element model of ligamentous L1-S1 segment was developed to predict time-domain dynamic response of the whole lumbar spine to axial cyclic loading with different frequencies. A compressive follower preload of 400 N was applied to the model to simulate the physiologic compressive load...
May 10, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28509889/the-role-of-nitrates-in-the-management-of-stable-ischemic-heart-disease-a-review-of-the-current-evidence-and-guidelines
#12
Mehul A Pragani, Karan P Desai, Doralisa Morrone, Mandeep S Sidhu, William E Boden
Coronary artery disease is the leading cause of mortality in the United States and can result in significant morbidity. In particular, stable ischemic heart disease (SIHD) is a condition that affects nearly 9 million individuals in the United States alone, with substantial annual health care costs related to recurrent medical visits and chronic disease management. Nitrates form a cornerstone of SIHD management by reducing myocardial oxygen consumption and increasing exercise capacity by several mechanisms, including increasing epicardial blood flow through vasodilation and decreased vascular resistance, blunting coronary steal, and reducing preload...
2017: Reviews in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28506136/predictors-to-intravenous-fluid-responsiveness
#13
Jorge Iván Alvarado Sánchez, William Fernando Amaya Zúñiga, Manuel Ignacio Monge García
Management with intravenous fluids can improve cardiac output in some surgical patients. Management with static preload indicators, such as central venous pressure and pulmonary artery occlusion pressure, has not demonstrated a suitable relationship with changes in the cardiac output induced by intravenous fluid therapy. Dynamic indicators, such as the variability of arterial pulse pressure or stroke volume variation, have demonstrated a suitable relationship. Since improvement in cardiac output does not guarantee an adequate perfusion pressure, in patients with hypotension, it is also necessary to know whether arterial pressure will also increase with intravenous fluid therapy...
January 1, 2017: Journal of Intensive Care Medicine
https://www.readbyqxmd.com/read/28504996/stroke-volume-variation-and-pulse-pressure-variation-are-not-useful-for-predicting-fluid-responsiveness-in-thoracic-surgery
#14
Dae Myoung Jeong, Hyun Joo Ahn, Hyo Won Park, Mikyung Yang, Jie Ae Kim, Joohyun Park
BACKGROUND: Stroke volume variation (SVV) and pulse pressure variation (PPV) are used as indicators of fluid responsiveness, but little is known about the usefulness of these dynamic preload indicators in thoracic surgery, which involves an open thoracic cavity and one-lung ventilation (OLV). Therefore, we investigated whether SVV and PPV could predict fluid responsiveness, and whether the thresholds of these parameters should be adjusted for thoracic surgery. METHODS: This was a prospective, controlled study conducted in a tertiary care center...
May 11, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28502493/the-effect-of-maximal-vs-submaximal-exertion-on-postprandial-lipid-levels-in-individuals-with-and-without-coronary-heart-disease
#15
David M Aronov, Marina G Bubnova, Natalia V Perova, Alexander N Orekhov, Yuri V Bobryshev
BACKGROUND: Decisions about fat consumption and levels of physical activity are among the everyday choices we make in life and risk of coronary heart disease (CHD) can be affected by those choices. OBJECTIVE: The purpose of this study was to investigate the influence of a standard fat load combined with physical exertion of different intensities on the plasma lipid profile of CHD patients and CHD-free individuals. METHODS: This study looked at the influence of different intensities of physical exercise on postprandial lipid metabolism in 20 healthy men and 36 men with diagnosis of CHD...
March 2017: Journal of Clinical Lipidology
https://www.readbyqxmd.com/read/28497774/evaluation-of-respiratory-and-postural-induced-changes-on-the-ballistocardiogram-signal-by-time-warping-averaging
#16
Alba Martin-Yebra, Federica Landreani, Claudia Casellato, Esteban Enrique Pavan, Pierre-François Migeotte, Carlo Frigo, Juan Martinez Cortes, Enrico Caiani
OBJECTIVE: The aim of this work was to evaluate the potential changes in the ballistocardiogram (BCG) signal induced by different respiratory patterns and posture, by using the dynamic time warping (DTW) technique. APPROACH: BCG signals were recorded in a group of 20 healthy volunteers, simultaneously to the ECG. Two recordings, one in supine (SUP) and one in standing (ST) position, including spontaneous breathing, two 1-minute apneas (at full and empty-lungs, respectively) and 30s of Valsalva, were analyzed...
May 12, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28494154/adsorption-of-estrogen-contaminants-by-graphene-nanomaterials-under-nom-preloading-comparison-with-carbon-nanotube-biochar-and-activated-carbon
#17
Luhua Jiang, Yunguo Liu, Shaobo Liu, Guangming Zeng, Xin-Jiang Hu, Xi Hu, Zhi Guo, Xiao-Fei Tan, Lele Wang, Zhibin Wu
Adsorption of two estrogen contaminants (17β-estradiol and 17α-ethynyl estradiol) by graphene nanomaterials was investigated and compared with those of a multi-walled carbon nanotube (MWCNT), a single-walled carbon nanotube (SWCNT), two biochars, a powdered activated carbon (PAC), and a granular activate carbon (GAC) in ultrapure water and in the competition of natural organic matter (NOM). Graphene nanomaterials showed comparable or better adsorption ability than carbon nanotubes (CNTs), biochars (BCs) and activated carbon (ACs) under NOM preloading...
May 11, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28491201/the-advantage-of-iron-containing-fiducial-markers-placed-with-a-thin-needle-for-radiotherapy-of-liver-cancer-in-terms-of-visualization-on-mri-an-initial-experience-of-gold-anchor
#18
Osamu Tanaka, Yoichi Nishigaki, Hideki Hayashi, Takayoshi Iida, Takamasa Yokoyama, Eiji Takenaka, Eiichi Yama, Eiichi Tomita
Radiotherapy for liver malignancy is increasing due to advances in radiotherapy technique. Visualization of the tumor as well as fiducial markers is essential. To see if improved visibility exists on computed tomography (CT) and magnetic resonance imaging (MRI), we evaluated an iron-containing fiducial marker. A patient with hepatocellular carcinoma and a patient with cholangiocarcinoma were enrolled. Pain caused by placement of marker and the best MRI sequence for visualization of both the fiducial marker as well as the liver tumor on MRI was evaluated...
June 2017: Radiology case reports
https://www.readbyqxmd.com/read/28479295/the-beneficial-hemodynamic-effects-of-afterload-reduction-by-sodium-nitroprusside-during-rewarming-from-experimental-hypothermia
#19
Brage Håheim, Timofey Kondratiev, Erik Sveberg Dietrichs, Torkjel Tveita
BACKGROUND: Rewarming from hypothermia is associated with depressed cardiac function, known as hypothermia-induced cardiac dysfunction (HCD), and increased systemic vascular resistance (SVR). Previous studies on pharmacological treatment of HCD have demonstrated beneficial effects when using drugs with the combined effects; cardiac inotropic support and peripheral vasodilation. The presented study aims to investigate the isolated effects of arterial dilatation on cardiac functional variables during rewarming from hypothermia using sodium nitroprusside (SNP)...
May 4, 2017: Cryobiology
https://www.readbyqxmd.com/read/28473988/in-vitro-evaluation-of-manual-torque-values-applied-to-implant-abutment-complex-by-different-clinicians-and-abutment-screw-loosening
#20
Onur Dincer Kose, Burcin Karataslı, Sabit Demircan, Taha Emre Kose, Erhan Cene, Serhan Aydın Aya, Mehmet Ali Erdem, Abdulkadir Burak Cankaya
Preload is applied to screws manually or using a torque wrench in dental implant systems, and the preload applied must be appropriate for the purpose. The aim of this study was to assess screw loosening and bending/torsional moments applied by clinicians of various specialties following application of manual tightening torque to combinations of implants and abutments. Ten-millimeter implants of 3.7 and 4.1 mm diameters and standard or solid abutments were used. Each group contained five implant-abutment combinations...
2017: BioMed Research International
keyword
keyword
62942
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"