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https://www.readbyqxmd.com/read/28539570/usefulness-and-safety-of-a-novel-modification-of-the-retrograde-approach-for-the-long-tortuous-chronic-total-occlusion-of-coronary-arteries
#1
Zehan Huang, Bin Zhang, Weilu Chai, Dunliang Ma, Hongtao Liao, Zhian Zhong, Feng Wang, Jingye Lin
The aim of this study was to evaluate the feasibility and efficacy of the Guidezilla guide extension catheter in a reverse controlled antegrade and retrograde subintimal tracking (CART) technique for chronic total occlusion (CTO) recanalization.We retrospectively collected 80 CTO cases using reverse CART technology from January 2015 to October 2015 and 20 CTO cases using Guidezilla reverse-CART technology from October 2015 to March 2016. Guidezilla was applied in cases when it was difficult to advance a retro-guidewire through an occlusion segment into the antegrade guide catheter...
May 23, 2017: International Heart Journal
https://www.readbyqxmd.com/read/28532814/control-aspects-of-the-human-cardiovascular-respiratory-system-under-a-nonconstant-workload
#2
Pio Gabrielle B Calderon, Mustafa Habib, Franz Kappel, Aurelio A de Los Reyes
The human cardiovascular system (CVS) and respiratory system (RS) work together in order to supply oxygen (O2) and other substrates needed for metabolism and to remove carbon dioxide (CO2). Global and local control mechanisms act on the CVS in order to adjust blood flow to the different parts of the body. This, in turn, affects the RS since the amount of O2 and CO2 transported, respectively to and away from the tissues depends on the cardiac output and blood flow in both the systemic and pulmonary circuits of the CVS...
May 19, 2017: Mathematical Biosciences
https://www.readbyqxmd.com/read/28532415/hemodynamic-changes-caused-by-acupuncture-in-healthy-volunteers-a-prospective-single-arm-exploratory-clinical-study
#3
Tae-Hun Kim, Boncho Ku, Jang-Han Bae, Jae-Young Shin, Min-Ho Jun, Jung Won Kang, Junghwan Kim, Jun-Hwan Lee, Jaeuk U Kim
BACKGROUND: Radial pressure pulse wave (RPPW) examination has been a key diagnostic component of traditional Chinese medicine. The objective of this study was to investigate the changes in RPPW along with various hemodynamic variables after acupuncture stimulation and to examine the validity of pulse diagnosis as a modern diagnostic tool. METHODS: We conducted acupuncture stimulation at both ST36 acupuncture points in 25 healthy volunteers. We simultaneously assessed the RPPW by pulse tonometry; heart rate variability (HRV) by electrocardiogram; photoplethysmogram (PPG) signals, respiration rate, peripheral blood flow velocity and arterial depth by ultrasonography; and cardiac output by impedance cardiography, before, during and after a session of acupuncture stimulation...
May 22, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28523563/assessment-of-endothelial-cell-function-and-physiological-microcirculatory-reserve-by-video-microscopy-using-a-topical-acetylcholine-and-nitroglycerin-challenge
#4
Matthias Peter Hilty, Jacqueline Pichler, Bulent Ergin, Urs Hefti, Tobias Michael Merz, Can Ince, Marco Maggiorini
BACKGROUND: Assessment of the microcirculation is a promising target for the hemodynamic management of critically ill patients. However, just as the sole reliance on macrocirculatory parameters, single static parameters of the microcirculation may not represent a sufficient guide. Our hypothesis was that by serial topical application of acetylcholine (ACH) and nitroglycerin (NG), the sublingual microcirculation can be challenged to determine its endothelial cell-dependent and smooth muscle-dependent physiological reserve capacity...
December 2017: Intensive Care Medicine Experimental
https://www.readbyqxmd.com/read/28523283/variable-temporal-sampling-and-tube-current-modulation-for-myocardial-blood-flow-estimation-from-dose-reduced-dynamic-computed-tomography
#5
Dimple Modgil, Michael D Bindschadler, Adam M Alessio, Patrick J La Rivière
Quantification of myocardial blood flow (MBF) can aid in the diagnosis and treatment of coronary artery disease. However, there are no widely accepted clinical methods for estimating MBF. Dynamic cardiac perfusion computed tomography (CT) holds the promise of providing a quick and easy method to measure MBF quantitatively. However, the need for repeated scans can potentially result in a high patient radiation dose, limiting the clinical acceptance of this approach. In our previous work, we explored techniques to reduce the patient dose by either uniformly reducing the tube current or by uniformly reducing the number of temporal frames in the dynamic CT sequence...
April 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28522658/effect-of-fontan-geometry-on-exercise-haemodynamics-and-its-potential-implications
#6
Elaine Tang, Zhenglun Alan Wei, Kevin K Whitehead, Reza H Khiabani, Maria Restrepo, Lucia Mirabella, James Bethel, Stephen M Paridon, Bradley S Marino, Mark A Fogel, Ajit P Yoganathan
OBJECTIVE: Exercise intolerance afflicts Fontan patients with total cavopulmonary connections (TCPCs) causing a reduction in quality of life. Optimising TCPC design is hypothesised to have a beneficial effect on exercise capacity. This study investigates relationships between TCPC geometries and exercise haemodynamics and performance. METHODS: This study included 47 patients who completed metabolic exercise stress test with cardiac magnetic resonance (CMR). Phase-contrast CMR images were acquired immediately following supine lower limb exercise...
May 18, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28521602/dynamic-alterations-in-cerebral-celiac-and-renal-flows-resulting-from-ascending-aorta-subclavian-artery-and-femoral-artery-cannulations-of-extracorporeal-devices
#7
Sahin Iscan, Habib Cakir, Bortecin Eygi, Ismail Yurekli, Koksal Donmez, Pınar Unde Ayvat, Derya Sarıkaya Pekel, Mert Kestelli
INTRODUCTION: The aim of this study was to assess the relationships among cardiac output, extracorporeal blood flow, cannulation site, right (RCa) and left carotid (LCa), celiac (Ca) and renal artery (Ra) flows during extracorporeal circulation. METHODS: A mock circulatory circuit was assembled, based on a compliant anatomical aortic model. The ascending aorta, right subclavian and femoral artery cannulations were created and flow was provided by a centrifugal pump (Cp); cardiac output was provided by a roller pump (Rp)...
May 1, 2017: Perfusion
https://www.readbyqxmd.com/read/28521042/induced-pluripotent-stem-cell-modelling-of-hlhs-underlines-the-contribution-of-dysfunctional-notch-signalling-to-impaired-cardiogenesis
#8
Chunbo Yang, Yaobo Xu, Min Yu, David Lee, Sameer Alharti, Nicola Hellen, Noor Ahmad Shaik, Babajan Banaganapalli, Hussein Ali Mohamoud Sheikh, Elango Ramu, Stefan Przyborski, Gennadiy Tenin, Simon Williams, John O'Sullivan, Osman O Al-Radi, Jameel Atta, Sian E Harding, Bernard Keavney, Majlinda Lako, Lyle Armstrong
Hypoplastic left heart syndrome (HLHS) is among the most severe forms of congenital heart disease. Although the consensus view is that reduced flow through the left heart during development is a key factor in the development of the condition, the molecular mechanisms leading to hypoplasia of left heart structures are unknown. We have generated induced pluripotent stem cells (iPSC) from five HLHS patients and two unaffected controls, differentiated these to cardiomyocytes and identified reproducible in vitro cellular and functional correlates of the HLHS phenotype...
May 17, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28518124/direct-re-implantation-of-left-coronary-artery-into-the-aorta-in-adults-with-anomalous-origin-of-left-coronary-artery-from-the-pulmonary-artery-alcapa
#9
Reza Tavakoli, Peiman Jamshidi, Nassrin Yamani, Max Gassmann
Anomalous origin of the left coronary artery from the pulmonary artery (ALCAPA) is a rare congenital anomaly which is one of leading causes of myocardial ischemia and infarction in children. If left untreated, it results in a 90% mortality rate in the first year of life. In patients who survive to the adulthood, the coronary steal phenomenon and retrograde left-sided coronary flow provide a substrate for chronic subendocardial ischemia, which may lead to left ventricular dysfunction, ischemic mitral regurgitation, malignant ventricular arrhythmias, and sudden cardiac death...
April 24, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28515516/changes-in-cardiac-index-during-labour-analgesia-a-double-blind-randomised-controlled-trial-of-epidural-versus-combined-spinal-epidural-analgesia-a-preliminary-study
#10
Stephanie Yacoubian, Corrina M Oxford, Bhavani Shankar Kodali
BACKGROUND AND AIMS: Combined spinal-epidural (CSE) analgesia for labour and delivery is occasionally associated with foetal bradycardia. Decreases in cardiac index (CI) and/or uterine hypertonia are implicated as possible aetiological factors. No study has evaluated CI changes following combined spinal analgesia for labour and delivery. This prospective, double-blind, randomised controlled trial evaluates haemodynamic trends during CSE and epidural analgesia for labour. METHODS: Twenty-six parturients at term requesting labour analgesia were randomised to receive either epidural (E) or CSE analgesia...
April 2017: Indian Journal of Anaesthesia
https://www.readbyqxmd.com/read/28512680/a-novel-idea-to-improve-cardiac-output-of-mechanical-circulatory-support-devices-by-optimizing-kinetic-energy-transfer-available-in-forward-moving-aortic-blood-flow
#11
Muhammad B Qureshi, Jacob Glower, Daniel L Ewert, Steven C Koenig
Mechanical circulatory support devices (MCSDs) have gained widespread clinical acceptance as an effective heart failure (HF) therapy. The concept of harnessing the kinetic energy (KE) available in the forward aortic flow (AOF) is proposed as a novel control strategy to further increase the cardiac output (CO) provided by MCSDs. A complete mathematical development of the proposed theory and its application to an example MCSDs (two-segment extra-aortic cuff) are presented. To achieve improved device performance and physiologic benefit, the example MCSD timing is regulated to maximize the forward AOF KE and minimize retrograde flow...
May 16, 2017: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/28508510/impaired-atrioventricular-transport-in-patients-with-transposition-of-the-great-arteries-palliated-by-atrial-switch-and-preserved-systolic-right-ventricular-function-a-magnetic-resonance-imaging-study
#12
Magalie Ladouceur, Nadjia Kachenoura, Gilles Soulat, Emilie Bollache, Alban Redheuil, Michel Azizi, Christophe Delclaux, Gilles Chatellier, Pierre Boutouyrie, Laurence Iserin, Damien Bonnet, Elie Mousseaux
OBJECTIVES: We aimed (1) determine if systemic right ventricle filling parameters influence systemic right ventricle stroke volume in adult patients with D-transposition of the great arteries (D-TGA) palliated by atrial switch, using cardiac magnetic resonance imaging and echocardiography, and (2) to study relationship of these diastolic parameters with exercise performance and BNP, in patients with preserved systolic systemic right ventricle function. DESIGN: Single-center, cross-sectional, prospective study...
May 16, 2017: Congenital Heart Disease
https://www.readbyqxmd.com/read/28506387/effects-of-atorvastatin-treatment-on-left-ventricular-diastolic-function-in-peritoneal-dialysis-patients-the-alevent-clinical-trial
#13
Cho-Kai Wu, Chih-Fan Yeh, Jiun-Yang Chiang, Ting-Tse Lin, Yi-Fan Wu, Chih-Kang Chiang, Tze-Wah Kao, Kuan-Yu Hung, Jenq-Wen Huang
BACKGROUND: Left ventricular diastolic dysfunction (LVDD) is common among patients undergoing peritoneal dialysis (PD). Increased levels of inflammatory biomarkers, such as high-sensitivity C-reactive protein, predict the development of LVDD. OBJECTIVES: We hypothesized that PD patients with elevated high-sensitivity C-reactive protein levels might benefit from statin treatment for LVDD and designed a randomized clinical trial to prove the hypothesis. METHODS: We screened 213 PD patients and randomly assigned 32 men and women with low-density lipoprotein cholesterol levels <130 mg/dL, high-sensitivity C-reactive protein levels of ≥1...
May 2017: Journal of Clinical Lipidology
https://www.readbyqxmd.com/read/28504408/kv1-3-channels-facilitate-the-connection-between-metabolism-and-blood-flow-in-the-heart
#14
REVIEW
Vahagn Ohanyan, Liya Yin, Raffi Bardakjian, Christopher Kolz, Molly Enrick, Tatevik Hakobyan, Jordan Luli, Kathleen Graham, Mohamed Khayata, Suzanna Logan, John Kmetz, William M Chilian
The connection between metabolism and flow in the heart, metabolic dilation, is essential for cardiac function. We recently found redox-sensitive Kv1.5 channels play a role in coronary metabolic dilation; however, more than one ion channel likely plays a role in this process as animals null for these channels still showed limited coronary metabolic dilation. Accordingly, we examined the role of another Kv1 family channel, the energetically linked Kv1.3 channel, in coronary metabolic dilation. We measured myocardial blood flow (contrast echocardiography) during norepinephrine-induced increases in cardiac work (heart rate x mean arterial pressure) in WT, WT mice given correolide (preferential Kv1...
May 2017: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/28504113/prognosis-of-spontaneous-coronary-artery-dissection-treated-by-percutaneous-coronary-intervention-with-optical-coherence-tomography
#15
Tsuyoshi Nishiguchi, Atsushi Tanaka, Akira Taruya, Yuichi Ozaki, Mai Nakai, Ikuko Teraguchi, Shingo Ota, Akio Kuroi, Takeyoshi Kameyama, Takashi Yamano, Tomoyuki Yamaguchi, Yoshiki Matsuo, Yasushi Ino, Takashi Kubo, Takeshi Hozumi, Takashi Akasaka
BACKGROUND: Although about half of patients with spontaneous coronary artery dissection (SCAD) face ongoing necrosis, conservative therapy is recommended due to a high complication rate in angiography-guided percutaneous coronary intervention (PCI). The aim of this study was to investigate clinical outcomes of SCAD treated by optical coherence tomography (OCT)-guided PCI. METHODS: This study consisted of consecutive 306 patients with acute coronary syndrome (ACS) who underwent OCT-guided PCI...
May 11, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/28501825/maternal-bradycardia-occurring-prior-to-onset-of-hellp-syndrome-in-a-woman-with-pre-eclampsia
#16
Ami Hosokawa, Takeshi Umazume, Takahiro Yamada, Hisanori Minakami
A 36-year-old nulliparous woman developed pre-eclampsia at gestational week (GW) 28(-6/7) Cardiac status was checked regularly. Heart rate of 93 beats per minute (bpm) with left atrial diameter (LAD) of 35 mm, left ventricular hypertrophy and inferior vena cava diameter (IVCD) of 8 mm at GW 32(-0/7) decreased to 48 bpm with an expanded IVCD to 25 mm, dilated left atrium (LAD to 39 mm), increased pulmonary arterial pressure, increased systemic vascular resistance (approximate 3000  dyn s/cm(5)) and biphasic intrarenal venous flow pattern 3...
May 13, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28497927/the-potential-role-of-pain-related-sseps-in-the-early-prognostication-of-long-term-functional-outcome-in-post-anoxic-coma
#17
Alessandra Del Felice, Stefano Bargellesi, Federico Linassi, Bruno Scarpa, Emanuela Formaggio, Paolo Boldrini, Stefano Masiero, Paolo Zanatta
BACKGROUND: Cardiac arrest (CA) is a common cause of disability. Multimodal evaluation has improved prognosis but precocious biomarkers are not appropriate in determining long-term functional outcome. AIM: to identify early prognostication markers of long-term functional outcome in post-anoxic coma. DESIGN: retrospective assessment of outcomes. POPULATION: Individuals older than 18 years with post-anoxic coma hospitalized in intensive care units after cardiac arrest (CA) regardless of cause (cardiac or non-cardiac) and location of event (in or out-of-hospital)...
May 12, 2017: European Journal of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28495952/deep-and-profound-hypothermia-in-haemorrhagic-shock-friend-or-foe-a-systematic-review
#18
REVIEW
Samuel E Moffatt, S J B Mitchell, J L Walke
INTRODUCTION: Survival in exsanguinating cardiac arrest patients is poor, as is neurological outcome in survivors. Hypothermia has traditionally been seen as harmful to trauma patients and associated with increased mortality; however, there has been speculation that cooling to very low temperatures (≤20°C) could be used to treat haemorrhagic trauma patients by the induction of a suspended animation period through extreme cooling, which improves survival and preserves neurological function...
May 11, 2017: Journal of the Royal Army Medical Corps
https://www.readbyqxmd.com/read/28495871/embryonic-hypoxia-programmes-postprandial-cardiovascular-function-in-adult-common-snapping-turtles-chelydra-serpentina
#19
Oliver H Wearing, Justin Conner, Derek Nelson, Janna Crossley, Dane A Crossley
Reduced oxygen availability (hypoxia) is a potent stressor during embryonic development, altering the trajectory of trait maturation and organismal phenotype. We previously documented that chronic embryonic hypoxia has a lasting impact on the metabolic response to feeding in juvenile snapping turtles (Chelydra serpentina). Turtles exposed to hypoxia as embryos (10% O2, H10) exhibited an earlier and increased peak postprandial oxygen consumption rate, compared to control turtles (21% O2, N21). In the current study, we measured central blood flow patterns to determine whether the elevated postprandial metabolic response in H10 turtles is linked to lasting impacts on convective transport...
May 11, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28490365/differentiation-of-mesenchymal-stem-cells-into-cardiomyocytes-is-regulated-by-mirna-1-2-via-wnt-signaling-pathway
#20
Xing Shen, Bo Pan, Huiming Zhou, Lingjuan Liu, Tiewei Lv, Jing Zhu, Xupei Huang, Jie Tian
BACKGROUND: Bone marrow derived stem cells (BMSCs) have the potential to differentiate into cardiomyocytes, but the rate of differentiation is low and the mechanism of differentiation is unclear completely. Here, we aimed to investigate the role of miR1-2 in differentiation of mouse BMSCs into cardiomyocyte-like cells and reveal the involved signaling pathways in the procedure. METHODS: Mouse BMSCs were treated with miR1-2 and 5-azacytine (5-aza). The expression of cardiac cell markers: NKx2...
May 10, 2017: Journal of Biomedical Science
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