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Noninvasive hemodynamic

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https://www.readbyqxmd.com/read/29351134/carotid-doppler-sonography-additional-tool-to-assess-hemodynamic-improvement-after-transcatheter-aortic-valve-implantation
#1
Valeria Cammalleri, Francesco Romeo, Massimo Marchei, Andrea Anceschi, Gianluca Massaro, Saverio Muscoli, Francesca De Persis, Massimiliano Macrini, Gian P Ussia
PURPOSE: The aim of our study was to assess the arterial cerebral blood flow variations in patients with aortic valve stenosis, immediately after the transcatheter aortic valve implantation (TAVI). METHODS: The study population includes 62 consecutive patients who underwent TAVI for aortic valve stenosis (95%) and sugical bioprosthesis degeneration (5%). Carotid Doppler examination was performed recording blood flow, systolic peak velocity, time average mean velocity and mean acceleration time at baseline, after balloon aortic valvuloplasty, and within 10 min after the device release...
January 17, 2018: Journal of Cardiovascular Medicine
https://www.readbyqxmd.com/read/29350189/detection-of-thoracic-vascular-structures-by-electrical-impedance-tomography-a-systematic-assessment-of-prominence-peak-analysis-of-impedance-changes
#2
Karin Henriette Wodack, Sarah Buehler, Sarah A Nishimoto, Michael F Graessler, Christoph R Behem, Andreas Daniel Waldmann, Beat Mueller, Stephan H Böhm, Eugenijus Kaniusas, Florian Thürk, Alexander Maerz, Constantin J C Trepte, Daniel A Reuter
Electrical impedance tomography (EIT) is a noninvasive and radiation free bedside monitoring technology, primarily used to monitor lung function. First experimental data shows that the descending aorta can be detected at different thoracic heights and might allow the assessment of central hemodynamics, i.e. stroke volume and pulse transit time. Approach: First, the feasibility of localizing small non-conductive objects within a saline phantom model was evaluated. Second, this result was utilized for the detection of the aorta by EIT in ten anesthetized pigs in with comparison to thoracic computer tomography (CT)...
January 19, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29344000/visible-near-infrared-spectroscopic-assessment-of-urogenital-tissue-in-premenopausal-and-postmenopausal-women
#3
Miranda A Farage, Tom Cambron, Kan-Zhi Liu
Background: A clinical study was conducted to evaluate the feasibility of using visible and near-infrared (NIR) spectroscopy as a potential noninvasive measure of genital skin health in premenopausal and postmenopausal women. Methods: A total of 45 female subjects (aged 21-70 years), all of whom gave fully informed consent to participate, were enrolled in the study and assigned to 1 of 3 groups: 15 premenopausal (Pre-M), 15 postmenopausal receiving hormone replacement therapy (Post-M HRT), and 15 postmenopausal receiving no form of hormone replacement therapy (Post-M non-HRT)...
2018: Clinical Medicine Insights. Women's Health
https://www.readbyqxmd.com/read/29342329/when-the-gold-standard-is-not-always-golden-the-value-of-invasive-hemodynamic-assessment-to-overcome-the-pitfalls-of-echocardiography-in-challenging-cases-of-mitral-stenosis
#4
Yenal Harper, Salem A Salem, Shadwan Alsafwah, Santhosh Koshy, Nadish Garg
Mitral stenosis is a uncommon valvular lesion in the developed countries. Noninvasive evaluation is the first-line modality for assessment of mitral stenosis, however the noninvasive methods may have limitations in certain cases. Invasive hemodynamics can be used as adjunct tool for assessment of mitral stenosis in such difficult cases. Mitral valve using three-dimensional planimetry is a promising technique for assessment of mitral stenosis.
January 2018: Echocardiography
https://www.readbyqxmd.com/read/29341985/dexmedetomidine-as-single-continuous-sedative-during-noninvasive-ventilation-typical-usage-hemodynamic-effects-and-withdrawal
#5
Brittany L Shutes, Samantha W Gee, Cheryl L Sargel, Kelsey A Fink, Joseph D Tobias
OBJECTIVES: Dexmedetomidine use in pediatric critical care is increasing. Its prolonged effects as a single continuous agent for sedation are not well described. The aim of the current study was to describe prolonged dexmedetomidine therapy without other continuous sedation, specifically the hemodynamic effects, discontinuation strategies, and risk factors for withdrawal. DESIGN: Retrospective chart review. SETTING: Large, single-center, quaternary care pediatric academic institution...
January 16, 2018: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/29340792/internal-jugular-vein-variability-predicts-fluid-responsiveness-in-cardiac-surgical-patients-with-mechanical-ventilation
#6
Guo-Guang Ma, Guang-Wei Hao, Xiao-Mei Yang, Du-Ming Zhu, Lan Liu, Hua Liu, Guo-Wei Tu, Zhe Luo
BACKGROUND: To evaluate the efficacy of using internal jugular vein variability (IJVV) as an index of fluid responsiveness in mechanically ventilated patients after cardiac surgery. METHODS: Seventy patients were assessed after cardiac surgery. Hemodynamic data coupled with ultrasound evaluation of IJVV and inferior vena cava variability (IVCV) were collected and calculated at baseline, after a passive leg raising (PLR) test and after a 500-ml fluid challenge. Patients were divided into volume responders (increase in stroke volume ≥ 15%) and non-responders (increase in stroke volume < 15%)...
January 16, 2018: Annals of Intensive Care
https://www.readbyqxmd.com/read/29329818/hybrid-imaging-in-ischemic-heart-disease
#7
Andreas A Giannopoulos, Oliver Gaemperli
Hybrid imaging for ischemic heart disease refers to the fusion of information from a single or usually from multiple cardiovascular imaging modalities enabling synergistic assessment of the presence, the extent, and the severity of coronary atherosclerotic disease along with the hemodynamic significance of lesions and/or with evaluation of the myocardial function. A combination of coronary computed tomography angiography with myocardial perfusion imaging, such as single-photon emission computed tomography and positron emission tomography, has been adopted in several centers and implemented in international coronary artery disease management guidelines...
January 9, 2018: Revista Española de Cardiología
https://www.readbyqxmd.com/read/29324491/validation-of-a-second-generation-near-infrared-spectroscopy-monitor-in-children-with-congenital-heart-disease
#8
Viviane G Nasr, Lisa T Bergersen, Hung-Mo Lin, Paul B Benni, Rachel S Bernier, Michelle E Anderson, Barry D Kussman
BACKGROUND: Cerebral oximetry using near-infrared spectroscopy is a noninvasive optical technology to detect cerebral hypoxia-ischemia and develop interventions to prevent and ameliorate hypoxic brain injury. Cerebral oximeters are calibrated and validated by comparison of the near-infrared spectroscopy-measured cerebral O2 saturation (SctO2) to a "field" or reference O2 saturation (REF CX) calculated as a weighted average from arterial and jugular bulb oxygen saturations. In this study, we calibrated and validated the second-generation, 5 wavelength, FORE-SIGHT Elite with the medium sensor (source-detector separation 12 and 40 mm) for measurement of SctO2 in children with congenital heart disease...
January 9, 2018: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29322338/the-oscillatory-flow-of-the-cerebrospinal-fluid-in-the-sylvian-aqueduct-and-the-prepontine-cistern-measured-with-phase-contrast-mri-in-children-with-hydrocephalus-a-preliminary-report
#9
Emilia Nowosławska, Dominika Gwizdała, Dobromiła Barańska, Piotr Grzelak, Michał Podgórski, Krzysztof Zakrzewski, Bartosz Polis, Mariusz Stasiołek, Lech Polis
INTRODUCTION: Recognizing patients with ventriculomegaly who are at risk of developing acute hydrocephalus presents a challenge for the clinician. The association between disturbed cerebrospinal fluid flow (CSF) and impaired brain compliance may play a role in the pathogenesis of hydrocephalus. Phase contrast MRI is a noninvasive technique which can be used to assess CSF parameters. The aim of the work is to evaluate the effectiveness of phase contrast MRI in recognizing patients at risk of acute hydrocephalus, based on measuring the pulsatile CSF flow parameters in the Sylvian aqueduct and prepontine cistern in children with ventriculomegaly...
January 10, 2018: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29321970/deepied-an-epileptic-discharge-detector-for-eeg-fmri-based-on-deep-learning
#10
Yongfu Hao, Hui Ming Khoo, Nicolas von Ellenrieder, Natalja Zazubovits, Jean Gotman
Presurgical evaluation that can precisely delineate the epileptogenic zone (EZ) is one important step for successful surgical resection treatment of refractory epilepsy patients. The noninvasive EEG-fMRI recording technique combined with general linear model (GLM) analysis is considered an important tool for estimating the EZ. However, the manual marking of interictal epileptic discharges (IEDs) needed in this analysis is challenging and time-consuming because the quality of the EEG recorded inside the scanner is greatly deteriorated compared to the usual EEG obtained outside the scanner...
2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/29313269/patient-specific-modeling-of-hemodynamics-supporting-surgical-planning-in-a-fontan-circulation-correction
#11
Theodorus M J van Bakel, Kevin D Lau, Jennifer Hirsch-Romano, Santi Trimarchi, Adam L Dorfman, C Alberto Figueroa
Computational fluid dynamics (CFD) is a modeling technique that enables calculation of the behavior of fluid flows in complex geometries. In cardiovascular medicine, CFD methods are being used to calculate patient-specific hemodynamics for a variety of applications, such as disease research, noninvasive diagnostics, medical device evaluation, and surgical planning. This paper provides a concise overview of the methods to perform patient-specific computational analyses using clinical data, followed by a case study where CFD-supported surgical planning is presented in a patient with Fontan circulation complicated by unilateral pulmonary arteriovenous malformations...
January 8, 2018: Journal of Cardiovascular Translational Research
https://www.readbyqxmd.com/read/29296629/alterations-in-neurovascular-coupling-following-acute-traumatic-brain-injury
#12
Hyounguk Jang, Stanley Huang, Daniel X Hammer, Lin Wang, Harmain Rafi, Meijun Ye, Cristin G Welle, Jonathan A N Fisher
Following acute traumatic brain injury (TBI), timely transport to a hospital can significantly improve the prognosis for recovery. There is, however, a dearth of quantitative biomarkers for brain injury that can be rapidly acquired and interpreted in active, field environments in which TBIs are frequently incurred. We explored potential functional indicators for TBI that can be noninvasively obtained through portable detection modalities, namely optical and electrophysiological approaches. By combining diffuse correlation spectroscopy with colocalized electrophysiological measurements in a mouse model of TBI, we observed concomitant alterations in sensory-evoked cerebral blood flow (CBF) and electrical potentials following controlled cortical impact...
October 2017: Neurophotonics
https://www.readbyqxmd.com/read/29287129/new-advances-in-fetal-cardiovascular-magnetic-resonance-imaging-for-quantifying-the-distribution-of-blood-flow-and-oxygen-transport-potential-applications-in-fetal-cardiovascular-disease-diagnosis-and-therapy
#13
REVIEW
Liqun Sun, Christopher K Macgowan, Sharon Portnoy, John G Sled, Shi-Joon Yoo, Lars Grosse-Wortmann, Edgar Jaeggi, John Kingdom, Mike Seed
Until recently, our modern understanding of fetal circulatory physiology has been largely based on invasive measurements made in fetal sheep. However, new MRI technology developed by our group has provided equivalent information about the distribution of blood flow and oxygen transport noninvasively. The initial findings largely confirm prior estimates about the human fetal circulation extrapolated from fetal sheep data and human ultrasound data. Here we describe the hemodynamics of the normal late gestation human fetal circulation by MRI and speculate about what the advent of this technology might mean in terms of the management of fetuses affected by placental insufficiency and congenital heart disease...
December 2017: Echocardiography
https://www.readbyqxmd.com/read/29284866/does-pulmonary-artery-systolic-pressure-as-estimated-by-transthoracic-echocardiography-alter-the-effect-of-positive-end-expiratory-pressure-on-arterial-blood-gases-and-hemodynamics-in-morbidly-obese-patients
#14
Dipti Saxena, Priyank Singh, Atul Dixit, Bipin Arya, Mohit Bhandari, Sadhana Sanwatsarkar
Background: Positive end-expiratory pressure (PEEP) at the time of induction increases oxygenation by preventing lung atelectasis. However, PEEP may not prove beneficial in all cases. Factors affecting the action of PEEP have not been elucidated well and remain controversial. Pulmonary vasculature has direct bearing on the action of PEEP as has been proven in the previous studies. Thus, this prospective study was planned to evaluate the action of PEEP on the basis of pulmonary artery systolic pressure (PASP) which is noninvasive and easily measured by transthoracic echocardiography...
October 2017: Anesthesia, Essays and Researches
https://www.readbyqxmd.com/read/29278864/stroke-volume-recruitability-during-the-third-trimester-of-pregnancy
#15
Sandra Herrera, Maggie J Kuhlmann-Capek, Sarah C Rogan, Antonio F Saad, George R Saade, Gary D V Hankins, Luis D Pacheco
OBJECTIVE:  It is unknown whether the heart operates in the ascending or flat portion of the Starling curve during normal pregnancy. Pregnant women do not respond to the passive leg-raising maneuver secondary to mechanical obstruction of the inferior vena cava by the gravid uterus. Our objective was to evaluate if administration of a fluid bolus increases baseline stroke volume (SV) among healthy pregnant patients during the third trimester. STUDY DESIGN:  Healthy pregnant women who underwent elective term cesarean sections were included...
December 26, 2017: American Journal of Perinatology
https://www.readbyqxmd.com/read/29278545/treatment-effect-of-balloon-pulmonary-angioplasty-in-chronic-thromboembolic-pulmonary-hypertension-quantified-by-automatic-comparative-imaging-in-computed-tomography-pulmonary-angiography
#16
Zhiwei Zhai, Hideki Ota, Marius Staring, Jan Stolk, Koichiro Sugimura, Kei Takase, Berend C Stoel
OBJECTIVES: Balloon pulmonary angioplasty (BPA) in patients with inoperable chronic thromboembolic pulmonary hypertension (CTEPH) can have variable outcomes. To gain more insight into this variation, we designed a method for visualizing and quantifying changes in pulmonary perfusion by automatically comparing computed tomography (CT) pulmonary angiography before and after BPA treatment. We validated these quantifications of perfusion changes against hemodynamic changes measured with right-sided heart catheterization...
December 22, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/29261549/continuous-noninvasive-arterial-pressure-monitoring-using-the-vascular-unloading-technique-cnap-system-in-obese-patients-during-laparoscopic-bariatric-operations
#17
Dorothea E Rogge, Julia Y Nicklas, Sebastian A Haas, Daniel A Reuter, Bernd Saugel
BACKGROUND: Increasing rates of obesity create new challenges for hemodynamic monitoring in the perioperative phase. Continuous monitoring of arterial pressure (AP) is important in severely obese patients who are at particular risk for cardiovascular complications. Innovative technologies for continuous noninvasive AP monitoring are now available. In this study, we aimed to compare continuous noninvasive AP measurements using the vascular unloading technique (CNAP system; CNSystems, Graz, Austria) compared with invasive AP measurements (radial arterial catheter) in severely obese patients during laparoscopic bariatric surgery...
December 19, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29249541/cerebrospinal-fluid-biomarkers-of-alzheimer-s-disease-are-associated-with-carotid-plaque-score-and-hemodynamics-in-intra-and-extra-cranial-arteries-on-ultrasonography
#18
Minoru Kouzuki, Masaya Nagano, Tetsuya Suzuki, Yuto Katsumata, Syouta Nakamura, Ayumi Takamura, Katsuya Urakami
Carotid plaque score (PS) and hemodynamic abnormalities in intra- and extra-cranial arteries are related to Alzheimer's disease (AD) progression. As these parameters are measured conveniently and non-invasively by ultrasonography, we examined their association with cerebral spinal fluid (CSF) AD biomarkers amyloid β (Aβ) and phosphorylated tau (p-tau). Carotid PS, mean flow velocity (MFV) in multiple intra- and extra-cranial arteries, CSF Aβ42 and p-tau, neurocognitive function (assessed by the Mini-Mental State Examination and Alzheimer's Disease Assessment Scale-cognitive subscale, Japanese version), and blood lipids (total cholesterol, HDL cholesterol, LDL cholesterol, and triglyceride) were measured in AD patients (n = 42), mild cognitive impairment patients (n = 20), and cognitively normal controls (n = 18)...
December 14, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/29248645/diagnostic-value-of-transluminal-attenuation-gradient-for-the-presence-of-ischemia-as-defined-by-fractional-flow-reserve-and-quantitative-positron-emission-tomography
#19
Michiel J Bom, Roel S Driessen, Wynand J Stuijfzand, Pieter G Raijmakers, Cornelis C Van Kuijk, Adriaan A Lammertsma, Albert C van Rossum, Niels van Royen, Juhani Knuuti, Maija Mäki, Koen Nieman, James K Min, Jonathon A Leipsic, Ibrahim Danad, Paul Knaapen
OBJECTIVES: The aim of this study was to investigate the incremental diagnostic value of transluminal attenuation gradient (TAG), TAG with corrected contrast opacification (TAG-CCO), and transluminal diameter gradient (TDG) over coronary computed tomography angiography (CTA)-derived diameter stenosis alone for the identification of ischemia as defined by both the invasive reference standard fractional flow reserve (FFR) and the noninvasive reference standard quantitative positron emission tomography (PET)...
December 8, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29246510/echocardiographic-detection-of-increased-ventricular-diastolic-stiffness-in-pediatric-heart-transplant-recipients-a-pilot-study
#20
Shahryar M Chowdhury, Ryan J Butts, Anthony M Hlavacek, Carolyn L Taylor, Karen S Chessa, Varsha M Bandisode, Girish S Shirali, Arni Nutting, G Hamilton Baker
BACKGROUND: Pediatric heart transplant recipients are at risk for increased left ventricular (LV) diastolic stiffness. However, the noninvasive evaluation of LV stiffness has remained elusive in this population. The objective of this study was to compare novel echocardiographic measures of LV diastolic stiffness versus gold-standard measures derived from pressure-volume loop (PVL) analysis in pediatric heart transplant recipients. METHODS: Patients undergoing left heart catheterization were prospectively enrolled...
December 12, 2017: Journal of the American Society of Echocardiography
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