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non invasive hemodynamic monitoring

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https://www.readbyqxmd.com/read/28497934/cerebral-autoregulation-monitoring-in-acute-traumatic-brain-injury-what-s-the-evidence
#1
Leanne A Calviello, Joseph Donnelly, Frederick A Zeiler, Eric P Thelin, Peter Smielewski, Marek Czosnyka
Cerebral autoregulation is conceptualized as a vascular self-regulatory mechanism within the brain. Controlled by elusive relationships between various biophysical processes, it functions to protect the brain against potential damages caused by sudden changes in cerebral perfusion pressures and flow. Following events such as traumatic brain injuries (TBI), autoregulation may be compromised, potentially leading to an unfavorable outcome. In spite of its complexity, autoregulation has been able to be quantified non-invasively within the neuro-critical care setting with the aid of transcranial Doppler...
May 12, 2017: Minerva Anestesiologica
https://www.readbyqxmd.com/read/28471443/the-role-of-near-infrared-spectroscopy-monitoring-in-preterm-infants
#2
P Korček, Z Straňák, J Širc, G Naulaers
Neurological morbidities such as peri/intraventricular hemorrhage and periventricular leukomalacia largely determine the neurodevelopmental outcome of vulnerable preterm infants and our aim should be to minimize their occurrence or severity. Bed-side neuromonitoring could provide valuable pieces of information about possible hemodynamic disturbances that are significantly associated with neurological morbidities and increased mortality. Near-infrared spectroscopy offers evaluation of regional cerebral oxygenation, which in conjunction with other non-invasive methods may give us a more complete picture about end-organ perfusion...
May 4, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28463939/validation-of-a-non-invasive-monitor-to-continuously-trend-individual-responses-to-hypovolemia
#3
Steven L Moulton, Jane Mulligan, Maria Antoinette Santoro, Khanh Bui, Greg Z Grudic, David MacLeod
BACKGROUND: Humans are able to compensate for significant blood loss with little change in traditional vital signs, limiting early detection and intervention. We hypothesized that the Compensatory Reserve Index (CRI), a new hemodynamic parameter which trends changes in intravascular volume relative to the individual patient's response to hypovolemia, would accurately trend each subject's progression from normovolemia to decompensation (SBP < 80) and back to normovolemia in humans. METHODS: Men and women, ages 19-36 years, underwent stepwise (~333 mL aliquot) removal and replacement of 20% blood volume (males 15 mL/kg; females 13 mL/kg) via a large bore IV...
May 1, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28437601/maternal-hemodynamics-in-normal-pregnancies-reference-ranges-and-the-role-of-maternal-characteristics
#4
Dimuthu Vinayagam, Baskaran Thilaganathan, Oliver Stirrup, Elena Mantovani, Asma Khalil
OBJECTIVES: The main aim of this study was to construct reference ranges of the maternal central hemodynamic parameters during pregnancy. The second aim was to determine the maternal and pregnancy characteristics, which influence these hemodynamic parameters. METHODS: This was a prospective cohort study of low-risk pregnant women attending for routine antenatal care at St George's Hospital, London. The exclusion criteria included any medical disorder present at the time of study recruitment, or development of hypertension or intrauterine fetal growth restriction following study recruitment...
April 24, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28409759/influence-of-central-hemodynamics-on-vv-ecmo-oxygen-delivery-in-neonatal-animal-model
#5
M M Said, O Rivera, G T Mikesell, K Rais-Bahrami
BACKGROUND: Recirculation of oxygenated blood in venovenous extracorporeal membrane oxygenation (VV ECMO) can decrease the oxygen delivery provided by the ECMO support. This study investigated the influence of central hemodynamics and catheter position on the amount of recirculation and oxygen delivery during VV ECMO. METHODS: Recirculation was measured in seven newborn lambs (mean weight 4.7 kg) during VV ECMO using the ELSA Monitor (Transonic Systems, Inc., Ithaca, NY) and using the central venous line (CVL) method...
2017: Journal of Neonatal-perinatal Medicine
https://www.readbyqxmd.com/read/28393776/serial-semi-invasive-hemodynamic-assessment-following-pericardiectomy-for-chronic-constrictive-pericarditis
#6
Ujjwal Kumar Chowdhury, Poonam Malhotra Kapoor, Adil Rizvi, Vishwas Malik, Sandeep Seth, Rajiv Narang, Mani Kalaivani, Sarvesh Pal Singh, Sathiya Selvam
OBJECTIVES: This study was designed to prospectively investigate the effects of pericardiectomy via median sternotomy on intra- and postoperative hemodynamics by a new semi-invasive device (Flotrac/VigileoTM monitor) using arterial pressure waveform analysis. PATIENTS AND METHODS: Thirty consecutive patients aged 15 to 55 years (mean+SD, 31.73 + 13.53 years), who had undergone total pericardiectomy via median sternotomy underwent serial hemodynamic evaluation. FlotracTM Sensor - derived stroke volume, stroke volume variation, systemic vascular resistance index (SVRI), cardiac index and right atrial pressure were measured just before and after pericardiectomy, at 12 hours, 24 hours, 48 hours, 72 hours and at discharge postoperatively...
April 2017: Annals of Cardiac Anaesthesia
https://www.readbyqxmd.com/read/28391426/comparison-of-stroke-volume-measurement-between-non-invasive-bioreactance-and-esophageal-doppler-in-patients-undergoing-major-abdominal-pelvic-surgery
#7
Gennaro De Pascale, Mervyn Singer, David Brealey
PURPOSE: Bioreactance is a non-invasive technology for measuring stroke volume (SV) in the operating room and critical care setting. We evaluated how the NICOM(®) bioreactance device performed against the CardioQ(®) esophageal Doppler monitor in patients undergoing major abdominal-pelvic surgery, focusing on the effect of different hemodynamic interventions. METHODS: SVNICOM and SVODM were simultaneously measured intraoperatively, including before and after interventions including fluid challenge, vasopressor boluses, peritoneal gas insufflation/removal, and Trendelenburg/reverse Trendelenburg patient positioning...
April 8, 2017: Journal of Anesthesia
https://www.readbyqxmd.com/read/28373639/assessment-of-volumetric-hemodynamic-parameters-and-body-composition-in-stable-renal-transplant-recipients
#8
Łukasz Czyżewski, Janusz Wyzgał, Emilia Czyżewska, Joanna Sańko-Resmer, Łukasz Szarpak
BACKGROUND Cardiovascular disease (CVD) has been associated with decreased graft survival and increased complications in renal transplant recipients (RTRs). The objectives of this study were to explore the relationship between body composition and hemodynamic parameters (cardiac index [CI] and systemic vascular resistance index [SVRI]) in RTRs. MATERIAL AND METHODS The study included 80 RTRs (mean age: 51±8 yrs) who had been admitted to our Nephrology and Transplantology Clinic at 0.5 to 28 years after KTx...
April 4, 2017: Annals of Transplantation: Quarterly of the Polish Transplantation Society
https://www.readbyqxmd.com/read/28368084/neurovascular-ultrasound-in-emergency-settings-diagnostic-and-therapeutic-aspects
#9
REVIEW
T Santos, M Veloso, P Barros
INTRODUCTION: Neurovascular ultrasound is a non-invasive, portable and fast imaging method that, when performed by an experienced neurosonologist, offers reliable and reproducible information on the morphological and hemodynamic status of cervical and intracranial vessels. AIM: To review the available evidence regarding the use of this tool in the approach to acute stroke. DEVELOPMENT: Neurovascular ultrasound can be used in one of two ways: diagnostic and therapeutic...
April 16, 2017: Revista de Neurologia
https://www.readbyqxmd.com/read/28360433/use-of-near-infrared-spectroscopy-nirs-in-cerebral-tissue-oxygenation-monitoring-in-neonates
#10
Rene Gumulak, Lucia Casnocha Lucanova, Mirko Zibolen
Near-infrared spectroscopy (NIRS) is a technology capable of non-invasive, continuous measuring of regional tissue oxygen saturation (StO2). StO2 represents a state of hemodynamic stability, which is influenced by many factors. Extensive research has been done in the field of measuring StO2 of various organs. The current clinical availability of several NIRS-based devices reflects an important development in prevention, detection and correction of discrepancy in oxygen delivery to the brain and vital organs...
March 30, 2017: Biomedical Papers of the Medical Faculty of the University Palacký, Olomouc, Czechoslovakia
https://www.readbyqxmd.com/read/28327093/continuous-non-invasive-finger-cuff-caretaker%C3%A2-comparable-to-invasive-intra-arterial-pressure-in-patients-undergoing-major-intra-abdominal-surgery
#11
Irwin Gratz, Edward Deal, Francis Spitz, Martin Baruch, I Elaine Allen, Julia E Seaman, Erin Pukenas, Smith Jean
BACKGROUND: Despite increased interest in non-invasive arterial pressure monitoring, the majority of commercially available technologies have failed to satisfy the limits established for the validation of automatic arterial pressure monitoring by the Association for the Advancement of Medical Instrumentation (AAMI). According to the ANSI/AAMI/ISO 81060-2:2013 standards, the group-average accuracy and precision are defined as acceptable if bias is not greater than 5 mmHg and standard deviation is not greater than 8 mmHg...
March 21, 2017: BMC Anesthesiology
https://www.readbyqxmd.com/read/28317398/cardiac-transplantation-towards-a-new-noninvasive-approach-of-cardiac-allograft-rejection
#12
REVIEW
Sophie I Mavrogeni, George Athanasopoulos, Aggeliki Gouziouta, Evangelos Leontiadis, Stamatis Adamopoulos, Genovefa Kolovou
Cardiac allograft rejection (CAR) may occur after transplantation and remains silent, until hemodynamic deterioration takes place. Endomyocardial biopsy (EMB) is applied to early detect CAR. Although, flexible bioptoms have decreased the incidence of lethal complications, EMB remains an invasive procedure carrying risk of tamponade and permanent heart block. Therefore, a new non-invasive approach is needed. Areas covered: AlloMap molecular expression testing and graft-derived cell-free DNA (GcfDNA) test can be used as blood indices of acute and chronic CAR, respectively...
April 2017: Expert Review of Cardiovascular Therapy
https://www.readbyqxmd.com/read/28294444/effect-of-change-in-posture-on-maternal-functional-hemodynamics-at-35-37-weeks-gestation
#13
Gavin P Guy, Hua Z Ling, Mirian Machuca, Liona C Poon, Kypros H Nicolaides
OBJECTIVE: To evaluate the effect of posture change from the supine to sitting position and before and after passive leg raising on maternal functional hemodynamics in pregnant women at 35-37 weeks' gestation and to compare the changes in pregnancies that subsequently developed preeclampsia (PE) and gestational hypertension (GH) to those who remained normotensive. METHODS: In 3,013 singleton pregnancies at 35-37 weeks' gestation maternal cardiovascular parameters were measured using an automated non-invasive cardiac monitor...
March 13, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28276534/non-invasive-assessment-of-cerebral-blood-flow-and-oxygen-metabolism-in-neonates-during-hypothermic-cardiopulmonary-bypass-feasibility-and-clinical-implications
#14
Silvina L Ferradal, Koichi Yuki, Rutvi Vyas, Christopher G Ha, Francesca Yi, Christian Stopp, David Wypij, Henry H Cheng, Jane W Newburger, Aditya K Kaza, Maria A Franceschini, Barry D Kussman, P Ellen Grant
The neonatal brain is extremely vulnerable to injury during periods of hypoxia and/or ischemia. Risk of brain injury is increased during neonatal cardiac surgery, where pre-existing hemodynamic instability and metabolic abnormalities are combined with long periods of low cerebral blood flow and/or circulatory arrest. Our understanding of events associated with cerebral hypoxia-ischemia during cardiopulmonary bypass (CPB) remains limited, largely due to inadequate tools to quantify cerebral oxygen delivery and consumption non-invasively and in real-time...
March 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28269375/non-invasive-cardiac-output-monitoring-in-pharmacology-a-plethysmographie-solution-in-rats
#15
Timothe Flenet, Julie Fontecave-Jallon, Stephane Tanguy, Francois Boucher, Pierre Baconnier, Pierre-Yves Gumery
Cardiovascular monitoring is of great importance in pharmacology but there is a lack of convenient non-invasive alternatives. Hence, we aim to evaluate the relevance of inductive plethysmography (IP) in preclinical cardiac studies. An IP system was specifically designed for rat. Its evaluation carried out using a mechanical test bench has shown appropriate instrumental performances for cardiac monitoring in rats. Measurements were also performed during a volume overload hemodynamic challenge in vivo in rats...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269217/non-invasive-monitoring-of-pulmonary-artery-pressure-at-the-bedside
#16
M Proenca, F Braun, E Muntane, J Sola, A Adler, M Lemay, J-Ph Thiran, S F Rimoldi
Current solutions for the monitoring of pulmonary artery pressure (PAP) in patients suffering from pulmonary hypertension are limited to invasive means. Non-invasive alternatives, such as Doppler echocardiography, are incompatible with continuous monitoring due to their dependency on qualified personnel to perform the measurements. In the present study, a novel non-invasive and unsupervised approach based on the use of electrical impedance tomography (EIT) is presented. The approach was evaluated in three healthy subjects undergoing hypoxia-induced variations in PAP...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268999/high-speed-in-vivo-imaging-of-retinal-hemodynamics-in-a-rodent-model-of-hypertension
#17
Mahdieh Rezaeian, Dana Georgevsky, S Mojtaba Golzan, Stuart L Graham
The eye is the only organ through which microcirculation can be visualized non-invasively. This unique feature makes the eye and specifically retinal vasculature an excellent target area to monitor and study micro-vascular damage in systemic diseases. Dynamic (real-time) changes of retinal vessels have been shown to be more specific to the disease in comparison with static measurements. In this study we utilize high speed imaging (i.e. 125 fps) to study and derive dynamic changes of retinal vessels in a rat model of hypertension...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268404/a-temperature-controlled-glove-with-non-invasive-arterial-pulse-sensing-for-active-neuro-vascular-assessment
#18
Andrew M Carek, Omer T Inan
A non-invasive, active neuro-vascular assessment system was developed using a modified temperature-controlled glove and feedback techniques. The glove incorporates local heating and cooling of the hand using multi-point skin temperature measurements as feedback, and thereby induces local and central mechanisms involved in thermoregulation. Electrocardiogram (ECG), photoplethysmogram (PPG) and non-invasive finger-cuff based blood pressure (BP) measurements were used to monitor electrophysiology and hemodynamic changes in response to temperature modulation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28241562/lookup-table-based-inverse-model-for-mapping-oxygen-concentration-of-cutaneous-microvessels-using-hyperspectral-imaging
#19
Wei Feng, Rui Shi, Chao Zhang, Tingting Yu, Dan Zhu
Hyperspectral imaging combining with skin optical clearing technique provides a possible way to non-invasively monitor hemodynamics of cutaneous microvessels. In order to estimate microvascular blood oxygen saturation, in this work, a lookup-table-based inverse model was developed to extract the microvascular optical and physiological properties using hyperspectral analysis. This approach showed a higher fitting degree than currently existing hyperspectral analysis methods (i.e. multiple linear regression and non-negative least square fit) in estimating blood oxygen saturation...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28238244/nt-probnp-as-a-potential-marker-of-left-atrial-dysfunction-in-rheumatic-mitral-stenosis-correlation-with-left-atrial-function-after-pbmv
#20
Rashi Khare, Sudhanshu Dwivedi
BACKGROUND: Rheumatic heart disease is a common reason for cardiovascular morbidity and mortality. Plasma levels of N-terminal pro-brain natriuretic peptide (NT-proBNP) are known to rise in patients with MS, but the role of this compound as a non-invasive marker of left atrial (LA) dysfunction is yet to be established. The study aim was to correlate levels of NT-proBNP in patients with rheumatic mitral stenosis (MS), with echocardiographic parameters of LA function including tissue Doppler-derived strain/strain rate (S/Sr) indices, hemodynamic parameters of LA function, before and after percutaneous balloon mitral valvotomy (PBMV) for a follow up of one year...
September 2016: Journal of Heart Valve Disease
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