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Index myocardial resistance

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https://www.readbyqxmd.com/read/29132649/doppler-versus-thermodilution-derived-coronary-microvascular-resistance-to-predict-coronary-microvascular-dysfunction-in-patients-with-acute-myocardial-infarction-or-stable-angina-pectoris
#1
Rupert P Williams, Guus A de Waard, Kalpa De Silva, Matthew Lumley, Kaleab Asrress, Satpal Arri, Howard Ellis, Awais Mir, Brian Clapp, Amedeo Chiribiri, Sven Plein, Paul F Teunissen, Maurits R Hollander, Michael Marber, Simon Redwood, Niels van Royen, Divaka Perera
Coronary microvascular resistance is increasingly measured as a predictor of clinical outcomes, but there is no accepted gold-standard measurement. We compared the diagnostic accuracy of 2 invasive indices of microvascular resistance, Doppler-derived hyperemic microvascular resistance (hMR) and thermodilution-derived index of microcirculatory resistance (IMR), at predicting microvascular dysfunction. A total of 54 patients (61 ± 10 years) who underwent cardiac catheterization for stable coronary artery disease (n = 10) or acute myocardial infarction (n = 44) had simultaneous intracoronary pressure, Doppler flow velocity and thermodilution flow data acquired from 74 unobstructed vessels, at rest and during hyperemia...
October 10, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/29115626/influence-of-androgen-on-myocardial-apoptosis-and-expression-of-myocardial-ir-and-irs%C3%A2-1-in-chronic-heart-failure-rat-models
#2
Yu Wang, Yang Hu, Zhaoping Zeng, Yinghua Li, Huipeng Su, Yiwei Li, Ruiping Wang, Mingqian Zhang, Yongli Yang, Jie Deng
The present study aimed to investigate the effect of androgens on chronic heart failure (CHF) in a rat model. A total of 120 Sprague Dawley male rats were randomly divided into the following groups: (A) sham operation group, (B) castrated group, (C) heart failure (HF) group, (D) castrated + HF group, and (E) castrated + HF + testosterone (T) replacement therapy group. There were 20 rats in group A, and 25 rats in the other groups. Surgical castration was performed on groups B, D and E, and T replacement therapy was administered to group E...
November 8, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29113999/index-of-microcirculatory-resistance-at-the-time-of-primary-percutaneous-coronary-intervention-predicts-early-cardiac-complications-insights-from-the-oxami-oxford-study-in-acute-myocardial-infarction-cohort
#3
Gregor Fahrni, Mathias Wolfrum, Giovanni Luigi De Maria, Florim Cuculi, Sam Dawkins, Mohammad Alkhalil, Niket Patel, John C Forfar, Bernard D Prendergast, Robin P Choudhury, Keith M Channon, Adrian P Banning, Rajesh K Kharbanda
BACKGROUND: Early risk stratification after primary percutaneous coronary intervention (PPCI) for ST-segment-elevation myocardial infarction is currently challenging. Identification of a low-risk group may improve triage of patients to alternative clinical pathways and support early hospital discharge. Our aim was to assess whether the index of microcirculatory resistance (IMR) at the time of PPCI can identify patients at low risk of early major cardiac complications and to compare its performance against guideline-recommended risk scores...
November 7, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29112510/prediction-of-postpercutaneous-coronary-intervention-myocardial-infarction-insights-from-intravascular-imaging-coronary-flow-and-biomarker-evaluation
#4
Stephen P Hoole, Jules Hernández-Sánchez, Adam J Brown, Joel P Giblett, Martin R Bennett, Nick E J West
BACKGROUND: Percutaneous coronary intervention-induced myocardial infarction (PMI) has prognostic significance. Identifying patients at high risk for PMI is desirable as it may alter strategy and facilitate early preventative therapy. We therefore sought to establish whether preprocedural demographic, interventional (plaque characteristics and coronary microcirculatory function), and inflammatory, endothelial damage, and platelet-derived biomarker data could predict the risk of PMI. PATIENTS AND METHODS: We performed target vessel pressure wire to assess fractional flow reserve, index of microcirculatory resistance (IMR) and coronary flow reserve, plaque characterization by virtual histology intravascular ultrasound, and assayed peripheral biomarkers before uncomplicated PCI in 88 patients...
November 6, 2017: Coronary Artery Disease
https://www.readbyqxmd.com/read/29111423/maternal-cardiovascular-dysfunction-in-women-with-early-onset-preeclampsia-and-late-onset-preeclampsia-a-cross-sectional-study
#5
Sindhura Vaddamani, Anish Keepanasseril, Ajith Ananthakrishna Pillai, Binay Kumar
OBJECTIVES: To compare the cardiovascular changes associated with early onset (EOPE) and late onset (LOPE) subtypes of preeclampsia. METHODS: A prospective matched cross-sectional study involving 50 women each with early and late onset subtypes of preeclampsia conducted in a tertiary hospital in South India. Cardiac function and remodelling were assessed by conventional 2D, M-mode and doppler echocardiography. RESULTS: Women with EOPE had a significantly more altered left ventricular (LV) geometry, global LV diastolic dysfunction, impairment in myocardial contractility (40% vs...
October 25, 2017: Pregnancy Hypertension
https://www.readbyqxmd.com/read/29095731/understanding-myocardial-infarction-evolution-infarct-size-and-index-of-microvascular-resistance-new-clinical-perspective
#6
Massimo Fineschi
: Approximately 40% of patients after ST elevation acute myocardial infarction (STEMI) have evidence of ineffective myocardial revascularization due to microvascular damage despite a successful target vessel recanalization by means of primary angioplasty (PPCI). Microvascular dysfunction is associated with the extension of the infarct size and with higher morbidity and mortality. Early identification of this phenomenon could be useful both for therapeutic and prognostic purposes. Index of microvascular resistance (IMR) could be assessed invasively at the end of PPCI and is a measure of microvascular function...
November 8, 2017: Journal of Cardiovascular Medicine
https://www.readbyqxmd.com/read/29054842/acute-biventricular-mechanical-circulatory-support-for-cardiogenic-shock
#7
Sudeep Kuchibhotla, Michele L Esposito, Catalina Breton, Robert Pedicini, Andrew Mullin, Ryan O'Kelly, Mark Anderson, Dennis L Morris, George Batsides, Danny Ramzy, Mark Grise, Duc Thinh Pham, Navin K Kapur
BACKGROUND: Biventricular failure is associated with high in-hospital mortality. Limited data regarding the efficacy of biventricular Impella axial flow catheters (BiPella) support for biventricular failure exist. The aim of this study was to explore the clinical utility of percutaneously delivered BiPella as a novel acute mechanical support strategy for patients with cardiogenic shock complicated by biventricular failure. METHODS AND RESULTS: We retrospectively analyzed data from 20 patients receiving BiPella for biventricular failure from 5 tertiary-care hospitals in the United States...
October 20, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29050558/similarity-and-difference-of-resting-distal%C3%A2-to-aortic-coronary-pressure-and%C3%A2-instantaneous-wave-free-ratio
#8
Joo Myung Lee, Jonghanne Park, Doyeon Hwang, Chee Hae Kim, Ki Hong Choi, Tae-Min Rhee, Yaliang Tong, Jin Joo Park, Eun-Seok Shin, Chang-Wook Nam, Joon-Hyung Doh, Bon-Kwon Koo
BACKGROUND: Instantaneous wave-free ratio (iFR) has been used in clinical practice to identify functionally significant stenosis and to guide treatment strategy. However, there are limited clinical data regarding another resting pressure-derived index, resting distal to aortic coronary pressure (Pd/Pa), and similarities and differences between resting Pd/Pa and iFR. OBJECTIVES: The authors investigated the changes in resting Pd/Pa and iFR according to anatomic and hemodynamic stenosis severity and their prognostic implications...
October 24, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29023250/biomechanical-determinants-of-right-ventricular-failure-in-pulmonary-hypertension
#9
Francesco Scardulla, Diego Bellavia, Patrizio Vitulo, Giuseppe Romano, Chiara Mina, Giovanni Gentile, Francesco Clemenza, Salvatore Pasta
Pulmonary hypertension (PH) is a disease characterized by progressive adverse remodeling of the distal pulmonary arteries, resulting in elevated pulmonary vascular resistance and load pressure on the right ventricle (RV), ultimately leading to RV failure. Invasive hemodynamic testing is the gold standard for diagnosing PH and guiding patient therapy. We hypothesized that lumped-parameter and biventricular finite-element (FE) modeling may lead to noninvasive predictions of both PH-related hemodynamic and biomechanical parameters that induce PH...
October 18, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/29016531/myocardial-preload-alters-central-pressure-augmentation-through-changes-in-the-forward-wave
#10
Lennart van de Velde, Daan W Eeftinck Schattenkerk, Pascale A H T Venema, Hendrik J Best, Bas van den Bogaard, Wim J Stok, Berend E Westerhof, Bert Jan H van den Born
OBJECTIVE: Augmentation index (AIx) is often used to quantify the contribution of wave reflection to central pulse pressure. Recent studies have challenged this view by showing how contractility-induced changes in the forward pressure wave can markedly impact AIx. We hypothesized that changes in preload will also affect AIx through changes in the forward wave and studied this in two experiments. METHODS: Noninvasively obtained aortic pressure was used to study central haemodynamics and wave morphology...
October 7, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28980052/right-ventricular-tissue-doppler-myocardial-performance-index-in-children-with-pulmonary-hypertension-relation-to-invasive-hemodynamics
#11
Richard M Friesen, Michal Schäfer, Dale A Burkett, Courtney J Cassidy, D Dunbar Ivy, Pei-Ni Jone
Right ventricular (RV) failure is a significant cause of morbidity and mortality in patients with pulmonary hypertension (PH). Myocardial performance index measured by tissue Doppler imaging (TDI-MPI) has been useful in assessing RV dysfunction in adults with PH. However, TDI-MPI as a marker for RV dysfunction or disease severity has not been evaluated in pediatric PH. The aim of this study was to investigate TDI-MPI and correlate with invasive hemodynamics in pediatric PH patients. Eighty pediatric PH patients undergoing cardiac catheterization and simultaneous transthoracic echocardiography were analyzed...
October 4, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28887378/smoking-cessation-and-outcome-after-ischemic-stroke-or-tia
#12
Katherine A Epstein, Catherine M Viscoli, J David Spence, Lawrence H Young, Silvio E Inzucchi, Mark Gorman, Brett Gerstenhaber, Peter D Guarino, Anand Dixit, Karen L Furie, Walter N Kernan
OBJECTIVE: To assess whether smoking cessation after an ischemic stroke or TIA improves outcomes compared to continued smoking. METHODS: We conducted a prospective observational cohort study of 3,876 nondiabetic men and women enrolled in the Insulin Resistance Intervention After Stroke (IRIS) trial who were randomized to pioglitazone or placebo within 180 days of a qualifying stroke or TIA and followed up for a median of 4.8 years. A tobacco use history was obtained at baseline and updated during annual interviews...
October 17, 2017: Neurology
https://www.readbyqxmd.com/read/28851362/inverse-associations-between-serum-levels-of-secreted-frizzled-related-protein-5-sfrp5-and-multiple-cardiometabolic-risk-factors-kora-f4-study
#13
Maren Carstensen-Kirberg, Julia M Kannenberg, Cornelia Huth, Christa Meisinger, Wolfgang Koenig, Margit Heier, Annette Peters, Wolfgang Rathmann, Michael Roden, Christian Herder, Barbara Thorand
AIMS: Secreted frizzled-related protein (Sfrp)5 has beneficial effects on insulin sensitivity, inflammation and cardiovascular risk in different mouse models, but its relevance for cardiometabolic diseases in humans is controversial. We aimed to characterise associations of circulating SFRP5 with cardiometabolic risk factors and prediabetes/type 2 diabetes in a large population-based cohort. METHODS: Cross-sectional associations between serum SFRP5 and cardiometabolic risk factors as well as prediabetes/type 2 diabetes were investigated in 1096 participants aged 62-81 years from the German KORA F4 study, of whom 666 had prediabetes or type 2 diabetes...
August 29, 2017: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/28804232/acute-beneficial-effects-of-muscular-counterpulsation-in-patients-with-coronary-heart-diseases
#14
Larry V Lapanashvili, Michael D Alshibaya, Julia Veselova, Leo A Bockeria
This prospective pilot study was designed to investigate the acute hemodynamic effects and clinical applicability of muscular counterpulsation (MCP), a one-shot procedure for biomechanical circulatory support. The study included 17 consecutive patients with coronary artery disease (CAD) and impaired ejection fraction (EF ≤45%) who underwent elective coronary artery bypass grafting (CABG). Patients were divided into control ( n  = 7) and treatment ( n  = 10) groups. MCP was applied through adhesive skin electrodes to the thighs and calves with a battery-powered, portable, ECG-triggered device for 15 minutes prior to general anesthesia...
September 2017: International Journal of Angiology: Official Publication of the International College of Angiology, Inc
https://www.readbyqxmd.com/read/28780839/-feasibility-and-value-of-index-of-microcirculatory-resistance-in-patients-with-acute-myocardial-infarction-after-primary-percutaneous-coronary-intervention
#15
J L Han, L Y He, M Cui, Y Z Zhang, X B Liu, X Y Xu, Y P Wang, F F Wang, G S Wang, J Niu, F C Zhang, L Mi, L J Guo, W Gao
Objective: To evaluate the feasibility of detecting index of microcirculatory resistance (IMR) and the relationship between IMR and left ventricular (LV) systolic function after acute myocardial infarction (AMI) undergoing primary percutaneous coronary intervention (PCI). Methods: The patients with first AMI received primary PCI in Peking University Third Hospital were enrolled from January 2014 to March 2016. IMR were measured immediately after PCI by using pressure/temperature wire. The relationship between IMR and left ventricular ejection fraction (LVEF) assessed by echocardiography at first day and 6 months after admission was evaluated...
August 1, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28725290/the-discovery-of-the-flammer-syndrome-a-historical-and-personal-perspective
#16
REVIEW
Josef Flammer, Katarzyna Konieczka
This review describes the clinical and basic research that led to the description of Flammer syndrome. It is narrated from a personal perspective. This research was initiated by the observation of an increased long-term fluctuation of visual fields in a subgroup of glaucoma patients. As these patients had strikingly cold hands, peripheral blood flow was tested with a capillary microscopy, and vasospastic syndrome (VS) was diagnosed. Further studies on these patients revealed frequently weakened autoregulation of ocular blood flow and increased flow resistivity in retroocular vessels...
June 2017: EPMA Journal
https://www.readbyqxmd.com/read/28679680/chronic-hypoxia-alters-maternal-uterine-and-fetal-hemodynamics-in-the-full-term-pregnant-guinea-pig
#17
Sifa Turan, Graham W Aberdeen, Loren P Thompson
Placental hypoxia is associated with maternal hypertension, placental insufficiency, and fetal growth restriction. In the pregnant guinea pig, prenatal hypoxia during early gestation inhibits cytotrophoblast invasion of spiral arteries, increases maternal blood pressure, and induces fetal growth restriction. In this study the impact of chronic maternal hypoxia on fetal heart structure was evaluated using four-dimensional echocardiography with spatiotemporal image correlation and tomographic ultrasound, and uterine and umbilical artery resistance/pulsatility indexes and fetal heart function were evaluated using pulsed-wave Doppler ultrasound...
October 1, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28667787/global-trends-in-aspirin-resistance-related-research-from-1990-to-2015-a-bibliometric-analysis
#18
Samah W Al-Jabi
Aspirin resistance can be defined as the inability of the usual dose of aspirin medication to produce its antithrombotic effect. Patients with diabetes or cardiovascular disease are at higher risk of stroke, myocardial infarction or cardiovascular death due to aspirin resistance. The aim of this bibliometric study was to identify and analyse the status and trends of aspirin resistance research production at global level through publications indexed in the Scopus database; this will shed new light on future research trends and help researchers predict dynamic direction of research...
July 1, 2017: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/28653312/link-of-renal-microcirculatory-dysfunction-to-increased-coronary-microcirculatory-resistance-in-hypertensive-patients
#19
Cong Lin, Pu Zhang, Yangjing Xue, Yinqing Huang, Kangting Ji
BACKGROUND: This study investigated the correlation between renal microcirculation and coronary microcirculation in hypertensive patients. METHODS: Participants consisted of 231 consecutive candidates who were referred to the Second Affiliated Hospital of Wenzhou Medical University from March 2014 to May 2016 for elective coronary angiography due to suspected myocardial ischemia. All participants were evaluated for the index of microvascular resistance (IMR), coronary flow reserve (CFR), and fractional flow reserve (FFR) using a pressure wire...
June 27, 2017: Cardiology Journal
https://www.readbyqxmd.com/read/28649956/the-ati-score-age-thrombotic-burden-index-of-microcirculatory-resistance-determined-during-primary-percutaneous-coronary-intervention-predicts-final-infarct-size-in-patients-with-st-elevation-myocardial-infarction-a-cardiac-magnetic-resonance-validation-study
#20
Giovanni Luigi De Maria, Mohammad Alkhalil, Mathias Wolfrum, Gregor Fahrni, Alessandra Borlotti, Lisa Gaughran, Sam Dawkins, Jeremy Langrish, Andrew Lucking, Robin Choudhury, Italo Porto, Filippo Crea, Erica Dall'Armellina, Keith Channon, Rajesh Kharbanda, Adrian Banning
AIMS: The age-thrombus score-index of microcirculatory resistance (ATI) score is a diagnostic tool able to predict suboptimal myocardial reperfusion before stenting, in patients with ST elevation myocardial infarction (STEMI). We aimed to validate the ATI score against cardiac magnetic resonance imaging (cMRI). METHODS AND RESULTS: The ATI score was calculated prospectively in 80 STEMI patients. cMRI was performed within 48 hours in all patients and in 50 patients at six months follow up to assess the extent of infarct size (IS%) and microvascular obstruction (MVO%)...
June 27, 2017: EuroIntervention
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