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https://www.readbyqxmd.com/read/28214080/clinical-outcome-and-correlates-of-coronary-microvascular-obstruction-in-latecomers-after-acute-myocardial-infarction
#1
Rocco A Montone, Giampaolo Niccoli, Silvia Minelli, Francesco Fracassi, Vincenzo Vetrugno, Cristina Aurigemma, Francesco Burzotta, Italo Porto, Carlo Trani, Filippo Crea
AIMS: Microvascular obstruction (MVO) is associated with a worse prognosis in patients with ST-elevation myocardial infarction (STEMI) treated by primary percutaneous coronary intervention (PCI). However, data about incidence, clinical outcome and correlates of MVO in latecomers after STEMI are still lacking. METHODS: We prospectively enrolled consecutive patients that were latecomers after STEMI (symptoms onset >12h) undergoing PCI. We performed an angiographic analysis to assess the occurrence of MVO [defined as TIMI flow grade ≤2 or 3 with a myocardial blush grade <2]...
February 12, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28211263/increased-regurgitant-flow-causes-endocardial-cushion-defects-in-an-avian-embryonic-model-of-congenital-heart-disease
#2
Stephanie M Ford, Matthew T McPheeters, Yves T Wang, Pei Ma, Shi Gu, James Strainic, Christopher Snyder, Andrew M Rollins, Michiko Watanabe, Michael W Jenkins
BACKGROUND: The relationship between changes in endocardial cushion and resultant congenital heart diseases (CHD) has yet to be established. It has been shown that increased regurgitant flow early in embryonic heart development leads to endocardial cushion defects, but it remains unclear how abnormal endocardial cushions during the looping stages might affect the fully septated heart. The goal of this study was to reproducibly alter blood flow in vivo and then quantify the resultant effects on morphology of endocardial cushions in the looping heart and on CHDs in the septated heart...
February 17, 2017: Congenital Heart Disease
https://www.readbyqxmd.com/read/28208847/effect-of-different-phases-of-menstrual-cycle-on-cardio-respiratory-efficiency-in-normal-overweight-and-obese-female-undergraduate-students
#3
Nazrin Samsudeen, Archana Rajagopalan
INTRODUCTION: The influence of obesity on cardio-respiratory efficiency in the various phases of menstrual cycle is not well understood until now. As majority of Indian women have a favourable attitude towards participation in sports it is significant to understand the variation in exercise performance during different phases of menstrual cycle to have an optimum performance. AIM: To evaluate the endurance capacity and cardio-respiratory responses in normal, obese and overweight female undergraduate students during different phases of menstrual cycle...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28193707/arterial-pressure-heart-rate-and-cerebral-hemodynamics-across-the-adult-life-span
#4
Chang-Yang Xing, Takashi Tarumi, Rutger L Meijers, Marcel Turner, Justin Repshas, Li Xiong, Kan Ding, Wanpen Vongpatanasin, Li-Jun Yuan, Rong Zhang
Age-related alterations in systemic and cerebral hemodynamics are not well understood. The purpose of this study is to characterize age-related alterations in beat-to-beat oscillations in arterial blood pressure (BP), heart rate (HR), cerebral blood flow (CBF), cardiac baroreflex sensitivity, and dynamic cerebral autoregulation across the adult life span. We studied 136 healthy adults aged 21 to 80 years (60% women). Beat-to-beat BP, HR, and CBF velocity were measured at rest and during sit-stand maneuvers to mimic effects of postural changes on BP and CBF...
February 13, 2017: Hypertension
https://www.readbyqxmd.com/read/28188434/bloodless-reperfusion-with-the-oxygen-carrier-hboc-201-in-acute-myocardial-infarction-a-novel-platform-for-cardioprotective-probes-delivery
#5
Jose M García-Ruiz, Carlos Galán-Arriola, Rodrigo Fernández-Jiménez, Jaume Aguero, Javier Sánchez-González, Ana García-Alvarez, Mario Nuno-Ayala, Gregory P Dubé, Zafiris Zafirelis, Gonzalo J López-Martín, Juan A Bernal, Enrique Lara-Pezzi, Valentín Fuster, Borja Ibáñez
Reperfusion, despite being required for myocardial salvage, is associated with additional injury. We hypothesize that infarct size (IS) will be reduced by a period of bloodless reperfusion with hemoglobin-based oxygen carriers (HBOC) before blood-flow restoration. In the pig model, we first characterized the impact of intracoronary perfusion with a fixed volume (600 ml) of a pre-oxygenated acellular HBOC, HBOC-201, on the healthy myocardium. HBOC-201 was administered through the lumen of the angioplasty balloon (i...
March 2017: Basic Research in Cardiology
https://www.readbyqxmd.com/read/28183863/hemodynamic-responses-are-reduced-with-aerobic-compared-with-resistance-blood-flow-restriction-exercise
#6
Anthony K May, Christopher R Brandner, Stuart A Warmington
The hemodynamics of light-load exercise with an applied blood-flow restriction (BFR) have not been extensively compared between light-intensity, BFR, and high-intensity forms of both resistance and aerobic exercise in the same participant population. Therefore, the purpose of this study was to use a randomized crossover design to examine the hemodynamic responses to resistance and aerobic BFR exercise in comparison with a common high-intensity and light-intensity non-BFR exercise. On separate occasions participants completed a leg-press (resistance) or treadmill (aerobic) trial...
February 2017: Physiological Reports
https://www.readbyqxmd.com/read/28174436/cardiovascular-response-to-bouts-of-exercise-with-blood-flow-restriction
#7
Kestutis Bunevicius, Arturas Sujeta, Kristina Poderiene, Birute Zachariene, Viktoras Silinskas, Rimantas Minkevicius, Jonas Poderys
[Purpose] Occlusion training with low-intensity resistance exercises and blood flow restriction increases muscle cross-sectional area and strength. This form of training is used in rehabilitation; therefore, the aim of this study was to examine the effect of one occlusion training session on the cardiovascular response to bouts of exercise. [Subjects and Methods] Two groups took part: a control group without blood flow restriction and an experimental group with blood flow restriction. A single training session was used with the exercise intensity set at 40% of the one repetition maximum...
December 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28174344/glucagon-like-peptide-1-elicits-vasodilation-in-adipose-tissue-and-skeletal-muscle-in-healthy-men
#8
Ali Asmar, Meena Asmar, Lene Simonsen, Sten Madsbad, Jens J Holst, Bolette Hartmann, Charlotte M Sorensen, Jens Bülow
In healthy subjects, we recently demonstrated that during acute administration of GLP-1, cardiac output increased significantly, whereas renal blood flow remained constant. We therefore hypothesize that GLP-1 induces vasodilation in other organs, for example, adipose tissue, skeletal muscle, and/or splanchnic tissues. Nine healthy men were examined twice in random order during a 2-hour infusion of either GLP-1 (1.5 pmol kg(-1) min(-1)) or saline. Cardiac output was continuously estimated noninvasively concomitantly with measurement of intra-arterial blood pressure...
February 2017: Physiological Reports
https://www.readbyqxmd.com/read/28168379/continuous-flow-left-ventricular-assist-device-support-improves-myocardial-supply-demand-in-chronic-heart-failure
#9
Kevin G Soucy, Carlo R Bartoli, Dustin Phillips, Guruprasad A Giridharan, Michael A Sobieski, William B Wead, Robert D Dowling, Zhongjun J Wu, Sumanth D Prabhu, Mark S Slaughter, Steven C Koenig
Continuous-flow left ventricular assist devices (CF LVADs) are rotary blood pumps that improve mean blood flow, but with potential limitations of non-physiological ventricular volume unloading and diminished vascular pulsatility. In this study, we tested the hypothesis that left ventricular unloading with increasing CF LVAD flow increases myocardial flow normalized to left ventricular work. Healthy (n = 8) and chronic ischemic heart failure (IHF, n = 7) calves were implanted with CF LVADs. Acute hemodynamics and regional myocardial blood flow were measured during baseline (LVAD off, clamped), partial (2-4 L/min) and full (>4 L/min) LVAD support...
February 6, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28168185/optimal-chest-compression-rate-and-compression-to-ventilation-ratio-in-delivery-room-resuscitation-evidence-from-newborn-piglets-and-neonatal-manikins
#10
REVIEW
Anne Lee Solevåg, Georg M Schmölzer
Cardiopulmonary resuscitation (CPR) duration until return of spontaneous circulation (ROSC) influences survival and neurologic outcomes after delivery room (DR) CPR. High quality chest compressions (CC) improve cerebral and myocardial perfusion. Improved myocardial perfusion increases the likelihood of a faster ROSC. Thus, optimizing CC quality may improve outcomes both by preserving cerebral blood flow during CPR and by reducing the recovery time. CC quality is determined by rate, CC to ventilation (C:V) ratio, and applied force, which are influenced by the CC provider...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/28164461/flexible-polygon-mirror-based-laser-scanning-microscope-platform-for-multiphoton-in-vivo-imaging
#11
Y X Li, V Gautam, A Brüstle, I A Cockburn, V R Daria, C Gillespie, K Gaus, C Alt, W M Lee
Commercial microscopy systems make use of tandem scanning i.e. either slow or fast scanning. We constructed, for the first time, an advanced control system capable of delivering a dynamic line scanning speed ranging from 2.7 kHz to 27 kHz and achieve variable frame rates from 5 Hz to 50 Hz (512 × 512). The dynamic scanning ability is digitally controlled by a new customized open-source software named PScan1.0. This permits manipulation of scanning rates either to gain higher fluorescence signal at slow frame rate without increasing laser power or increase frame rates to capture high speed events...
February 6, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28145873/incidence-of-bradycardia-and-outcomes-of-patients-who-underwent-orbital-atherectomy-without-a-temporary-pacemaker
#12
Michael S Lee, Heajung Nguyen, Richard Shlofmitz
OBJECTIVE: We analyzed the incidence of bradycardia and the safety of patients with severely calcified coronary lesions who underwent orbital atherectomy without the insertion of a temporary pacemaker. BACKGROUND: The presence of severely calcified coronary lesions can increase the complexity of percutaneous coronary intervention due to the difficulty in advancing and optimally expanding the stent. High-pressure inflations to predilate calcified lesions may cause angiographic complications like perforation and dissection...
February 2017: Journal of Invasive Cardiology
https://www.readbyqxmd.com/read/28138813/noninvasive-pet-quantitative-myocardial-blood-flow-with-regadenoson-for-assessing-cardiac-allograft-vasculopathy-in-orthotopic-heart-transplantation-patients
#13
Miguel Hernandez Pampaloni, Uttam M Shrestha, Maria Sciammarella, Youngho Seo, Grant T Gullberg, Elias H Botvinick
BACKGROUND: Risk stratification and early detection of cardiac allograft vasculopathy (CAV) is essential in orthotopic heart transplantation (OHT) patients. This study assesses the changes in myocardial blood flow (MBF) noninvasively in OHT patients using quantitative cardiac PET with regadenoson. METHODS: Twelve patients (Group 1) (8 males, 4 females, mean age 55 ± 7 years) with no history of post OHT myocardial ischemia were enrolled 5.4 ± 2.0 years after OHT...
January 30, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28131704/notch3-deficiency-impairs-coronary-microvascular-maturation-and-reduces-cardiac-recovery-after-myocardial-ischemia
#14
Yong-Kang Tao, Heng Zeng, Guo-Qiang Zhang, Sean T Chen, Xue-Jiao Xie, Xiaochen He, Shuo Wang, Hongyan Wen, Jian-Xiong Chen
RATIONALE: Vascular maturation plays an important role in wound repair post-myocardial infarction (MI). The Notch3 is critical for pericyte recruitment and vascular maturation during embryonic development. OBJECTIVE: This study is to test whether Notch3 deficiency impairs vascular maturation and blunts cardiac functional recovery post-MI. APPROACH AND RESULTS: Wild type (WT) and Notch3 knockout (Notch3KO) mice were subjected to MI by the ligation of left anterior descending coronary artery (LAD)...
January 24, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28123614/the-association-of-layperson-characteristics-with-the-quality-of-simulated-cardiopulmonary-resuscitation-performance
#15
Marion Leary, David G Buckler, Daniel J Ikeda, Daiane A Saraiva, Robert A Berg, Vinay M Nadkarni, Audrey L Blewer, Benjamin S Abella
BACKGROUND: Few studies have examined the association of layperson characteristics with cardiopulmonary resuscitation (CPR) provision. Previous studies suggested provider characteristics, including age and gender, were associated with CPR quality, particularly chest compression (CC) depth. We sought to determine the association of subject characteristics, including age and gender with layperson CPR quality during an unannounced simulated CPR event. We hypothesized shallower CC depth in females, and older-aged subjects...
2017: World Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28122851/intradialytic-cardiac-magnetic-resonance-imaging-to-assess-cardiovascular-responses-in-a-short-term-trial-of-hemodiafiltration-and-hemodialysis
#16
Charlotte Buchanan, Azharuddin Mohammed, Eleanor Cox, Katrin Köhler, Bernard Canaud, Maarten W Taal, Nicholas M Selby, Susan Francis, Chris W McIntyre
Hemodynamic stress during hemodialysis (HD) results in recurrent segmental ischemic injury (myocardial stunning) that drives cumulative cardiac damage. We performed a fully comprehensive study of the cardiovascular effect of dialysis sessions using intradialytic cardiac magnetic resonance imaging (MRI) to examine the comparative acute effects of standard HD versus hemodiafiltration (HDF) in stable patients. We randomly allocated 12 patients on HD (ages 32-72 years old) to either HD or HDF. Patients were stabilized on a modality for 2 weeks before undergoing serial cardiac MRI assessment during dialysis...
November 10, 2016: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28118786/mathematical-analysis-and-physical-profile-of-blalock-taussig-shunt-and-sano-modification-procedure-in-hypoplastic-left-heart-syndrome
#17
Efrain Riveros Perez, Ricardo Riveros
The first stage of surgical treatment for hypoplastic left heart syndrome (HLHS) includes the creation of artificial systemic-to-pulmonary connections to provide pulmonary blood flow. The modified Blalock-Taussig (mBT) shunt has been the technique of choice for this procedure; however, a right ventricle-pulmonary artery (RV-PA) shunt has been introduced into clinical practice with encouraging but still conflicting outcomes when compared with the mBT shunt. The aim of this study is to explore mathematical modeling as a tool for describing physical profiles that could assist the surgical team in predicting complications related to stenosis and malfunction of grafts in an attempt to find correlations with clinical outcomes from clinical studies that compared both surgical techniques and to assist the anesthesiologist in making decisions to manage patients with this complex cardiac anatomy...
January 1, 2017: Seminars in Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/28118265/intermittent-aortic-valve-opening-and-risk-of-thrombosis-in-vad-patients
#18
Claudius Mahr, Venkat Keshav Chivukula, Patrick McGah, Anthony R Prisco, Jennifer A Beckman, Nahush A Mokadam, Alberto Aliseda
This study evaluates quantitatively the impact that intermittent Aortic Valve opening has on the thrombogenicity in the aortic arch region for patients under Left Ventricular Assist Device therapy. The influence of flow through the Aortic Valve, opening once every five cardiac cycles, on the flow patterns in the ascending aortic is measured in a patient-derived CT-image-based model, after LVAD implantation. The mechanical environment of flowing platelets is investigated, by statistical treatment of outliers in Lagrangian particle tracking, and thrombogenesis metrics (platelet residence times and activation state characterized by shear stress accumulation) are compared for the cases of no Aortic Valve opening and intermittent Aortic Valve opening...
January 20, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28114013/wall-less-flow-phantoms-with-tortuous-vascular-geometries-design-principles-and-a-patient-specific-model-fabrication-example
#19
Chung Kit Ho, Adrian J Y Chee, Billy Y S Yiu, Anderson C O Tsang, Kwok Wing Chow, Alfred C H Yu
Flow phantoms with anatomically realistic geometry and high acoustic compatibility are valuable investigative tools in vascular ultrasound studies. Here, we present a new framework to fabricate ultrasound-compatible flow phantoms to replicate human vasculature that is tortuous, non-planar and branching in nature. This framework is based upon the integration of rapid prototyping and investment casting principles. A pedagogical walkthrough of our engineering protocol is presented in this paper using a patient-specific cerebral aneurysm model as an exemplar demonstration...
December 6, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28113368/a-comparison-between-compounding-techniques-using-large-beam-steered-plane-wave-imaging-for-blood-vector-velocity-imaging-in-a-carotid-artery-model
#20
Anne Saris, Hendrik Hansen, Stein Fekkes, Maartje Nillesen, Marcel Rutten, Chris de Korte
Conventional color Doppler imaging is limited, since it only provides velocity estimates along the ultrasound beam direction for a restricted field of view at a limited frame rate. High frame rate speckle tracking, using plane wave transmits, has shown potential for 2D blood velocity estimation. However, due to the lack of focusing in transmit, image quality gets reduced, which hampers speckle tracking. Although ultrafast imaging facilitates improved clutter filtering, it still remains a major challenge in blood velocity estimation...
September 7, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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