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Noninvasive hemodynamic

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https://www.readbyqxmd.com/read/28093805/heartware-ventricular-assist-device-implantation-in-patients-with-fontan-physiology
#1
Bartlomiej R Imielski, Robert A Niebler, Steven J Kindel, Ronald K Woods
We aim to describe the clinical course of a series of patients with hypoplastic left heart syndrome and refractory systolic heart failure supported with a HeartWare ventricular assist device (HVAD) following Fontan palliation. This is a retrospective review of three consecutive patients supported with a HVAD following Fontan palliation through February 2016. Data include patient characteristics, operative variables, postimplantation hemodynamic/device parameters, event outcomes, and duration of HVAD support...
January 2017: Artificial Organs
https://www.readbyqxmd.com/read/28090665/can-patel-s-%C3%AF-accurately-estimate-directionality-of-connections-in-brain-networks-from-fmri
#2
Yunzhi Wang, Olivier David, Xiaoping Hu, Gopikrishna Deshpande
PURPOSE: Investigating directional interactions between brain regions plays a critical role in fully understanding brain function. Consequently, multiple methods have been developed for noninvasively inferring directional connectivity in human brain networks using functional MRI (fMRI). Recent simulations by Smith et al showed that Patel's τ, a method based on higher-order statistics, was the best approach for inferring directional interactions from fMRI. Because simulations make restrictive assumptions about reality, we set out to verify this finding using experimental fMRI data obtained from a three-region network in a rat model with electrophysiological validation...
January 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28078170/computational-fluid-dynamics-assisted-characterization-of-parafoveal-hemodynamics-in-normal-and-diabetic-eyes-using-adaptive-optics-scanning-laser-ophthalmoscopy
#3
Yang Lu, Miguel O Bernabeu, Jan Lammer, Charles C Cai, Martin L Jones, Claudio A Franco, Lloyd Paul Aiello, Jennifer K Sun
Diabetic retinopathy (DR) is the leading cause of visual loss in working-age adults worldwide. Previous studies have found hemodynamic changes in the diabetic eyes, which precede clinically evident pathological alterations of the retinal microvasculature. There is a pressing need for new methods to allow greater understanding of these early hemodynamic changes that occur in DR. In this study, we propose a noninvasive method for the assessment of hemodynamics around the fovea (a region of the eye of paramount importance for vision)...
December 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/28059848/hemodynamic-monitoring-in-thoracic-surgical-patients
#4
Jacob Raphael, Lindsay A Regali, Robert H Thiele
PURPOSE OF REVIEW: This article reviews the technology and clinical data describing hemodynamic monitoring devices available to anesthesiologists and intensivists caring for patients undergoing thoracic surgical procedures, so that they may better utilize available technology to improve outcomes in this high-risk surgical population. RECENT FINDINGS: Noninvasive stroke volume monitors are based on several different technology platforms, all of which have distinct performance characteristics...
January 3, 2017: Current Opinion in Anaesthesiology
https://www.readbyqxmd.com/read/28043670/vascular-aging-and-hypertension-implications-for-the-clinical-application-of-central-blood-pressure
#5
REVIEW
Hao-Min Cheng, Sungha Park, Qifang Huang, Satoshi Hoshide, Ji-Guang Wang, Kazuomi Kario, Chang-Gyu Park, Chen-Huan Chen
Vascular aging may be responsible for the high residual lifetime risk for hypertension in the middle-aged and elderly individuals. Increased arterial stiffness and wave reflection has been recognized as the dominant hemodynamic manifestations of vascular aging, and both are major determinants of central blood pressure (BP) and independent predictors for incident hypertension. Because central BP is strongly linearly associated with age, it can be regarded as an integrated marker for vascular aging. Central BP can be measured noninvasively using various techniques, including the convenient cuff-based oscillometric central BP monitors...
December 27, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/28043661/use-of-noninvasive-and-invasive-mechanical-ventilation-in-cardiogenic-shock-a-prospective-multicenter-study
#6
Mari Hongisto, Johan Lassus, Tuukka Tarvasmaki, Alessandro Sionis, Heli Tolppanen, Matias Greve Lindholm, Marek Banaszewski, John Parissis, Jindrich Spinar, Jose Silva-Cardoso, Valentina Carubelli, Salvatore Di Somma, Josep Masip, Veli-Pekka Harjola
BACKGROUND: Despite scarce data, invasive mechanical ventilation (MV) is widely recommended over non-invasive ventilation (NIV) for ventilatory support in cardiogenic shock (CS). We assessed the real-life use of different ventilation strategies in CS and their influence on outcome focusing on the use of NIV and MV. METHODS: 219 CS patients were categorized by the maximum intensity of ventilatory support they needed during the first 24h into MV (n=137; 63%) , NIV (n=26; 12%), and supplementary oxygen (n=56; 26%) groups...
December 27, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/28041606/acquisition-retention-and-transfer-of-simulated-laparoscopic-tasks-using-fnir-and-a-contextual-interference-paradigm
#7
Patricia A Shewokis, Faiz U Shariff, Yichuan Liu, Hasan Ayaz, Andres Castellanos, D Scott Lind
BACKGROUND: Using functional near infrared spectroscopy, a noninvasive, optical brain imaging tool that monitors changes in hemodynamics within the prefrontal cortex (PFC), we assessed performance and cognitive effort during the acquisition, retention and transfer of multiple simulated laparoscopic tasks by novice learners within a contextual interference paradigm. METHODS: Third-year medical students (n = 10) were randomized to either a blocked or random practice schedule...
December 1, 2016: American Journal of Surgery
https://www.readbyqxmd.com/read/28039229/the-role-of-diastolic-stress-testing-in-the-evaluation-for-hfpef-a-simultaneous-invasive-echocardiographic-study
#8
Masaru Obokata, Garvan C Kane, Yogesh N V Reddy, Thomas P Olson, Vojtech Melenovsky, Barry A Borlaug
BACKGROUND: -Diagnosis of heart failure (HF) with preserved ejection fraction (HFpEF) is challenging and relies largely on demonstration of elevated cardiac filling pressures (pulmonary capillary wedge pressure, PCWP). Current guidelines recommend use of natriuretic peptides (NT-proBNP) and rest/exercise echocardiography (E/e' ratio) to make this determination. Data to support this practice is conflicting. METHODS: -Simultaneous echocardiographic-catheterization studies were prospectively conducted at rest and during exercise in subjects with invasively-proven HFpEF (n=50) and participants with dyspnea but no identifiable cardiac pathology (n=24)...
December 30, 2016: Circulation
https://www.readbyqxmd.com/read/28031656/a-very-unusual-cause-of-hemoptysis
#9
Pablo Loarte, Geraldo Holguín, Ronny Cohen
The use of Lucite balls or spheres played a role in the management of tuberculosis during the first decade of the 20th century. Several complications have been reported with the use of this surgical technique, but are rarely seen nowadays. The availability of effective oral regimens has forced to abandon this approach. Calcification of these spheres within the lung cavity produced a series of late complications result of the migration of these foreign bodies to adjacent structures, causing erosion of blood vessels and nerves...
December 2016: International Journal of Angiology: Official Publication of the International College of Angiology, Inc
https://www.readbyqxmd.com/read/28030449/hemodynamic-monitoring-in-thoracic-surgical-patients
#10
Jacob Raphael, Lindsay A Regali, Robert H Thiele
PURPOSE OF REVIEW: This article reviews the technology and clinical data describing hemodynamic monitoring devices available to anesthesiologists and intensivists caring for patients undergoing thoracic surgical procedures, so that they may better utilize available technology to improve outcomes in this high-risk surgical population. RECENT FINDINGS: Noninvasive stroke volume monitors are based on several different technology platforms, all of which have distinct performance characteristics...
February 2017: Current Opinion in Anaesthesiology
https://www.readbyqxmd.com/read/28012642/postoperative-cerebral-and-somatic-near-infrared-spectroscopy-saturations-and-outcome-in-hypoplastic-left-heart-syndrome
#11
George M Hoffman, Nancy S Ghanayem, John P Scott, James S Tweddell, Michael E Mitchell, Kathleen A Mussato
BACKGROUND: Circulatory vulnerability reflected by low systemic venous oxygen saturation after surgical palliation of hypoplastic left heart syndrome predicts adverse neurologic outcome and reduced survival, and targeting venous saturation may improve outcome. We herein test the hypothesis that near-infrared spectroscopy (NIRS)-derived cerebral and somatic/renal regional saturations can predict survival. METHODS: Patient data, from a prospective Institutional Review Board-approved registry of hemodynamic measures after initial palliation of hypoplastic left heart syndrome, were analyzed with logistic and multivariable mixed regression methods to determine relationships between standard hemodynamic measures, direct and NIRS measures of saturation, and outcome...
December 21, 2016: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/27986335/presenting-phenotypes-of-acute-heart-failure-patients-in-the-emergency-department-identification-and-implications
#12
Richard M Nowak, Brian P Reed, Salvatore DiSomma, Prabath Nanayakkara, Michele Moyer, Scott Millis, Phillip Levy
BACKGROUND: There is little known about the baseline hemodynamic (HD) profiles (beyond pulse/blood pressure) of patients presenting to the Emergency department (ED) with acute heart failure (AHF). Assessing these baseline parameters could help differentiate underlying HD phenotypes which could be used to develop specific phenotypic specific approaches to patient care. METHODS: Patients with suspected AHF were enrolled in the PREMIUM (Prognostic Hemodynamic Profiling in the Acutely Ill Emergency Department Patient) multinational registry and continuous HD monitoring was initiated on ED presentation using noninvasive finger cuff technology (Nexfin, BMEYE, Edwards Lifesciences, Irvine, California)...
December 8, 2016: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/27974870/hemodynamic-response-to-upper-airway-obstruction-in-hypertensive-and-normotensive-pregnant-women
#13
John Reid, Riley A Glew, Joe Mink, John Gjevre, Mark Fenton, Robert Skomro, Femi Olatunbosun
Background. Mild obstructive sleep apnea is common in pregnancy and may have an exacerbating role in gestational hypertension, although currently the interaction between these two diseases is uncertain. Methods. We analyzed 43 pregnant subjects, 28 with gestational hypertension (GH) and 15 with normal healthy pregnancy, by level I polysomnography. Additionally, diastolic and systolic blood pressure changes in response to obstructive respiratory events were measured by noninvasive beat-by-beat monitoring. We also assessed a subgroup (n = 27) of women with respiratory disturbance indexes <5, for blood pressure responses to very subtle obstructive respiratory disturbances ("airflow reductions")...
2016: Canadian Respiratory Journal: Journal of the Canadian Thoracic Society
https://www.readbyqxmd.com/read/27974609/resting-state-hemodynamics-are-spatiotemporally-coupled-to-synchronized-and-symmetric-neural-activity-in-excitatory-neurons
#14
Ying Ma, Mohammed A Shaik, Mariel G Kozberg, Sharon H Kim, Jacob P Portes, Dmitriy Timerman, Elizabeth M C Hillman
Brain hemodynamics serve as a proxy for neural activity in a range of noninvasive neuroimaging techniques including functional magnetic resonance imaging (fMRI). In resting-state fMRI, hemodynamic fluctuations have been found to exhibit patterns of bilateral synchrony, with correlated regions inferred to have functional connectivity. However, the relationship between resting-state hemodynamics and underlying neural activity has not been well established, making the neural underpinnings of functional connectivity networks unclear...
December 27, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27968777/noninvasive-epicardial-and-endocardial-electrocardiographic-imaging-of-scar-related-ventricular-tachycardia
#15
Linwei Wang, Omar A Gharbia, B Milan Horáček, John L Sapp
BACKGROUND: The majority of life-threatening ventricular tachycardias (VTs) are sustained by heterogeneous scar substrates with narrow strands of surviving tissue. An effective treatment for scar-related VT is to modify the underlying scar substrate by catheter ablation. If activation sequence and entrainment mapping can be performed during sustained VT, the exit and isthmus of the circuit can often be identified. However, with invasive catheter mapping, only monomorphic VT that is hemodynamically stable can be mapped in this manner...
November 2016: Journal of Electrocardiology
https://www.readbyqxmd.com/read/27932509/use-of-phase-contrast-mra-to-assess-intracranial-venous-sinus-resistance-to-drainage-in-healthy-individuals
#16
S Fall, G Pagé, J Bettoni, R Bouzerar, O Balédent
BACKGROUND AND PURPOSE: Resistance to blood flow in the cerebral drainage system may affect cerebral hemodynamics. The objective of the present study was to use phase-contrast MRA to quantify resistance to drainage of blood across branches of the venous sinus tree and to determine whether the resistance to drainage values correlated with internal jugular vein outflows. MATERIALS AND METHODS: We performed whole-head phase-contrast MRA and 2D phase-contrast MR imaging in 31 healthy volunteers...
December 8, 2016: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/27931053/hemodynamic-responses-to-blood-flow-restriction-and-resistance-exercise-to-muscular-failure
#17
C A Libardi, A M Catai, M Miquelini, A Borghi-Silva, V Minatel, I F Alvarez, J C Milan-Mattos, H Roschel, V Tricoli, C Ugrinowitsch
The aim of the present study was to compare hemodynamic responses between blood flow-restricted resistance exercise (BFR-RE), high-intensity resistance exercise (HI-RE) and low-intensity resistance exercise (LI-RE) performed to muscular failure. 12 men (age: 20±3 years; body mass: 73.5±9 kg; height: 174±6 cm) performed 4 sets of leg press exercises using BFR-RE (30% of 1-RM), HI-RE (80% of 1-RM) and LI-RE (30% of 1-RM) protocols. Systolic (SBP) and diastolic blood pressure (DBP), heart rate (HR), stroke volume (SV), cardiac output (CO) and total peripheral vascular resistance (TPR) were measured on a beat-to-beat continuous basis by a noninvasive photoplethysmographic arterial pressure device...
December 8, 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27930564/effects-of-intraoperative-dexmedetomidine-with-intravenous-anesthesia-on-postoperative-emergence-agitation-delirium-in-pediatric-patients-undergoing-tonsillectomy-with-or-without-adenoidectomy-a-consort-prospective-randomized-controlled-clinical-trial
#18
Jun-Li Cao, Yu-Ping Pei, Jing-Qiu Wei, Yue-Ying Zhang
Postoperative emergence agitation/delirium (POED) is a common complication in pediatric surgery patients, which increases the risk of developing postoperative airway obstruction and respiratory depression. This study aims to investigate the safety and efficacy of intraoperative infusion of dexmedetomidine (DEX) and its effects on POED in pediatric patients undergoing tonsillectomy with or without adenoidectomy.Sixty patients scheduled for tonsillectomy with or without adenoidectomy, aged 2 to 8 years, were randomly allocated into 2 groups (n = 30)...
December 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27925417/effects-of-temperature-on-multiparametric-evaluation-of-hindlimb-ischemia-with-dynamic-fluorescence-imaging
#19
Wenjuan Cai, Huizhi Guang, Chuangjian Cai, Jianwen Luo
Quantitative evaluation of hindlimb ischemia is essential for early diagnosis and therapy of peripheral arterial disease (PAD). Dynamic imaging using near-infrared (NIR) fluorophore indocyanine green (ICG) is a noninvasive and effective tool to monitor multiple vascular parameters including perfusion rate (PR), perfusion vascular density (PVD) and hemodynamics. It has been previously demonstrated that temperature changes could lead to significant variations of blood flow rate and vascular perfusion. In this paper, multiparametric evaluation of hindlimb ischemia was performed at different temperatures...
December 7, 2016: Journal of Biophotonics
https://www.readbyqxmd.com/read/27925228/a-mock-circulatory-system-incorporating-a-compliant-3d-printed-anatomical-model-to-investigate-pulmonary-hemodynamics
#20
Paul G M Knoops, Giovanni Biglino, Alun D Hughes, Kim H Parker, Linzhang Xu, Silvia Schievano, Ryo Torii
A realistic mock circulatory system (MCS) could be a valuable in vitro testbed to study human circulatory hemodynamics. The objective of this study was to design a MCS replicating the pulmonary arterial circulation, incorporating an anatomically representative arterial model suitable for testing clinically relevant scenarios. A second objective of the study was to ensure the system's compatibility with magnetic resonance imaging (MRI) for additional measurements. A latex pulmonary arterial model with two generations of bifurcations was manufactured starting from a 3D-printed mold reconstructed from patient data...
December 7, 2016: Artificial Organs
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