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Impedance cardiography

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https://www.readbyqxmd.com/read/29761224/cardiopulmonary-factors-affecting-6-min-walk-distance-in-patients-with-idiopathic-inflammatory-myopathies
#1
Naoki Mugii, Fujiko Someya
Idiopathic inflammatory myopathies involve skeletal muscles and can be associated with interstitial lung disease and/or heart dysfunction, which may reduce exercise capacity. We aimed to clarify cardiopulmonary factors affecting the 6-min walk distance in patients who were able to walk without leg pain or fatigue. Twenty-three patients with inactive adult idiopathic inflammatory myopathies, and 18 age- and gender-matched healthy controls were evaluated for hemodynamic responses using noninvasive impedance cardiography during the 6-min walk test...
May 14, 2018: Rheumatology International
https://www.readbyqxmd.com/read/29745622/noninvasive-assessment-of-cardiac-index-using-impedance-cardiography-during-liver-transplantation-surgery-a-comparison-with-pulmonary-artery-thermodilution
#2
Vlad Suparschi, Eric Le Bihan, Amélie Toussaint, Diana Saptefrat, Heykel Ben Abdallah, Faouzi Gloulou, Farida Aouati, Tobias Gauss, Catherine Paugam-Burtz
BACKGROUND: Liver Transplantation (LT) is a high-risk surgery associated with significant hemodynamic changes requiring advanced hemodynamic monitoring. Pulmonary Artery Catheter (PAC) is still considered as a gold-standard for cardiac index (CI) measurement during LT despite association with an increased risk of complications. Noninvasive impedance cardiography (ICG) could be an interesting alternative tool for CI monitoring. The aim of this study was to compare the precision and trending ability of ICG versus PAC methods during LT...
May 9, 2018: Minerva Anestesiologica
https://www.readbyqxmd.com/read/29738504/changes-of-blood-pressure-and-hemodynamic-parameters-after-oral-magnesium-supplementation-in-patients-with-essential-hypertension-an-intervention-study
#3
Nikolina Banjanin, Goran Belojevic
The objective of this study was to examine the changes of blood pressure and hemodynamic parameters after oral magnesium supplementation in patients with essential hypertension. The single-arm non-blinded intervention study comprised 48 patients (19 men; 29 women) whose antihypertensive therapy was not changed for at least one month. The participants were asked to consume (daily at home) 300 mg of oral magnesium-oxide supplementation product for one month and to have their blood pressure and hemodynamic parameters (thoracic fluid content, stroke volume, stroke index, cardiac output, cardiac index, acceleration index, left cardiac work index and systemic vascular resistance index, heart rate) measured in the hospital before and after the intervention...
May 8, 2018: Nutrients
https://www.readbyqxmd.com/read/29734516/dermal-capillary-rarefaction-as-a-marker-of-microvascular-damage-in-patients-with-rheumatoid-arthritis-association-with-inflammation-and-disorders-of-the-macrocirculation
#4
Panagiota Anyfanti, Eugenia Gkaliagkousi, Areti Triantafyllou, Xenophon Zabulis, Panagiotis Dolgyras, Vasiliki Galanopoulou, Spyros Aslanidis, Stella Douma
OBJECTIVE: Capillary rarefaction is observed in various cardiovascular diseases, yet it remains understudied in RA, a chronic inflammatory disease accompanied by excess cardiovascular risk. We quantified capillary density in RA patients and explored potential associations with macrocirculatory disorders, inflammation and cardiovascular risk. METHODS: Dermal capillary density was assessed with nailfold capillaroscopy in RA and non-RA individuals, using specifically designed semiautomated software...
May 7, 2018: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/29721510/evaluation-of-skeletal-muscle-function-and-effects-of-early-rehabilitation-during-acute-heart-failure-rationale-and-study-design
#5
Kinga Węgrzynowska-Teodorczyk, Agnieszka Siennicka, Krystian Josiak, Robert Zymliński, Monika Kasztura, Waldemar Banasiak, Piotr Ponikowski, Marek Woźniewski
Background: Acute heart failure (AHF) is associated with disturbances of the peripheral perfusion leading to the dysfunction of many organs. Consequently, an episode of AHF constitutes a "multiple organ failure" which may also affect the skeletal muscles. However, the abnormalities within skeletal muscles during AHF have not been investigated so far. The aim of this project is to comprehensively evaluate skeletal muscles (at a functional and tissue level) during AHF. Methods: The study will include ≥63 consecutive AHF patients who will be randomized into 2 groups: ≥42 with cardiac rehabilitation group versus ≥21 with standard pharmacotherapy alone...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29680522/psychopathology-everyday-behaviors-and-autonomic-activity-in-daily-life-an-ambulatory-impedance-cardiography-study-of-depression-anxiety-and-hypomanic-traits
#6
Sarah H Sperry, Thomas R Kwapil, Kari M Eddington, Paul J Silvia
Discrepancies regarding the link between autonomic nervous system (ANS) activity and psychopathology may be due in part to inconsistent measurement of non-psychological factors, including eating, drinking, activity, posture, and interacting with others. Rather than sources of noise, behaviors like being active and being with others may be the behavioral pathways that connect psychopathology symptoms to autonomic activity. The present study examined whether behaviors mediate the association of depression, anxiety, and hypomanic traits with ANS by using experience sampling methodology and ambulatory impedance cardiography...
April 19, 2018: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/29623416/agreement-between-preload-reserve-measured-by-impedance-cardiography-and-echocardiography-during-pregnancy
#7
Huan Liang, Åse Vårtun, Ganesh Acharya
PURPOSE: Accurate assessment of cardiac function is important during pregnancy. Echocardiography and impedance cardiography (ICG) are commonly used noninvasive methods to measure stroke volume (SV) and cardiac output (CO). The difference in stroke volume (ΔSV) or cardiac output (ΔCO) measured at baseline and after passive leg raising (PLR) is a measure of preload reserve that predicts volume responsiveness. However, the agreement between these two methods in measuring preload reserve during pregnancy is unclear...
April 5, 2018: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/29593797/factors-influencing-p-terminal-force-in-lead-v1-of-the-ecg-in-hemodialysis-patients
#8
Andrzej Jaroszyński, Anna Jaroszyńska, Wojciech Dąbrowski, Tomasz Zaborowski, Andrzej Stepulak, Marek Iłżecki, Tomasz Zubilewicz
Introduction: Atrial fibrillation (AF) is a highly prevalent arrhythmia in hemodialysis (HD) patients, and an HD session may be a trigger for AF episodes. An abnormal P-terminal force in lead V1 (PTFV1) may predict new-onset AF in HD patients. The aim of the study was to assess the influence of the HD process on PTFV1 and to evaluate possible factors influencing PTFV1 in a group of selected HD patients. Material and methods: One hundred and fifty-three selected HD patients entered the study...
March 2018: Archives of Medical Science: AMS
https://www.readbyqxmd.com/read/29587655/impedance-cardiography-as-tool-for-continuous-hemodynamic-monitoring-during-cesarean-section-randomized-prospective-double-blind-study
#9
Alessandro D'Ambrosio, Antonella Cotoia, Renata Beck, Potito Salatto, Lada Zibar, Gilda Cinnella
BACKGROUND: Impedance Cardiography (ICG) is a non-invasive tool for continuous hemodynamic monitoring. Aims of our study were to assess the utility of ICG to evaluate the hemodynamic impact of 6 mg (GL6) vs 8 mg (GL8) levobupivacaine combined with fentanyl in healthy patients undergoing elective cesarean section; secondary, to compare the duration and quality of analgesia and anesthesia. METHODS: Sixty-two women receiving combined spinal-epidural (CSE) for elective cesarean delivery were randomly allocated to GL6 or GL8 groups...
March 27, 2018: BMC Anesthesiology
https://www.readbyqxmd.com/read/29560750/association-of-non-invasive-hemodynamics-with-arterial-stiffness-in-rheumatoid-arthritis
#10
Panagiota Anyfanti, Areti Triantafyllou, Eugenia Gkaliagkousi, Nikolaos Koletsos, Spyros Aslanidis, Stella Douma
OBJECTIVES: Arterial stiffness has emerged as a surrogate marker of cardiovascular disease. We investigated the role of myocardial performance and hemodynamic parameters in arterial stiffness in patients with rheumatoid arthritis (RA), which is accompanied by excess cardiovascular risk. DESIGN: Arterial stiffness was evaluated with pulse wave velocity (PWV) in RA patients and controls. Cardiac and hemodynamic characterization was based on impedance cardiography...
March 21, 2018: Scandinavian Cardiovascular Journal: SCJ
https://www.readbyqxmd.com/read/29546504/novel-characterization-method-of-impedance-cardiography-signals-using-time-frequency-distributions
#11
Jesús Escrivá Muñoz, Y Pan, S Ge, E W Jensen, M Vallverdú
The purpose of this document is to describe a methodology to select the most adequate time-frequency distribution (TFD) kernel for the characterization of impedance cardiography signals (ICG). The predominant ICG beat was extracted from a patient and was synthetized using time-frequency variant Fourier approximations. These synthetized signals were used to optimize several TFD kernels according to a performance maximization. The optimized kernels were tested for noise resistance on a clinical database. The resulting optimized TFD kernels are presented with their performance calculated using newly proposed methods...
March 16, 2018: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29528117/the-carotid-chemoreceptor-contributes-to-the-elevated-arterial-stiffness-and-vasoconstrictor-outflow-in-chronic-obstructive-pulmonary-disease
#12
Devin B Phillips, Craig D Steinback, Sophie É Collins, Desi P Fuhr, Tracey L Bryan, Eric Y L Wong, Vincent Tedjasaputra, Mohit Bhutani, Michael K Stickland
KEY POINTS: The reason(s) for the increased central arterial stiffness in chronic obstructive pulmonary disease (COPD) are not well understood. In this study, we inhibited the carotid chemoreceptor with both low-dose dopamine and hyperoxia, and observed a decrease in central arterial stiffness and muscle sympathetic nervous activity in COPD patients, while no change was observed in age- and risk-matched controls. Carotid chemoreceptor inhibition increased vascular conductance, secondary to reduced arterial blood pressure in COPD patients...
March 12, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29523837/association-of-nocturnal-blood-pressure-patterns-with-inflammation-and-central-and-peripheral-estimates-of-vascular-health-in-rheumatoid-arthritis
#13
Eugenia Gkaliagkousi, Panagiota Anyfanti, Sophia Chatzimichailidou, Areti Triantafyllou, Antonios Lazaridis, Spyros Aslanidis, Stella Douma
Predictors of adverse cardiovascular outcomes include elevated nighttime systolic blood pressure (SBP) and a non-dipping pattern. We investigated whether these factors correlate with systemic inflammation, cardiovascular risk, and markers of central and peripheral vascular damage in rheumatoid arthritis (RA), a disease characterized by excess cardiovascular risk. Twenty-four-hour ambulatory blood pressure monitoring was applied in patients and controls. Vascular assessments included measurement of arterial stiffness (pulse wave velocity) and carotid atherosclerosis (carotid intima-media thickness)...
April 2018: Journal of Human Hypertension
https://www.readbyqxmd.com/read/29518385/cardiac-autonomic-nervous-system-activity-and-cardiac-function-in-children-after-coarctation-repair
#14
Ineke Nederend, Eco J C de Geus, Lucia J M Kroft, Jos J M Westenberg, Nico A Blom, Arend D J Ten Harkel
BACKGROUND: Coarctation of the aorta (CoA) is one of the most common congenital heart defects. Most patients live into adulthood as a result of improved surgical techniques; however, late complications, including hypertension, recoarctation, and arrhythmias, are common. The autonomic nervous system (ANS) might play a role in the pathology. This study evaluated cardiac ANS activity and cardiac function in children after CoA repair and investigated the relationship between the two. METHODS: The study participants were 31 children after CoA repair and 62 healthy controls aged between 8 and 18 years...
March 5, 2018: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/29512163/toward-a-better-noninvasive-assessment-of-preejection-period-a-novel-automatic-algorithm-for-b-point-detection-and-correction-on-thoracic-impedance-cardiogram
#15
Mohamad Forouzanfar, Fiona C Baker, Massimiliano de Zambotti, Corey McCall, Laurent Giovangrandi, Gregory T A Kovacs
Impedance cardiography is the most common clinically validated, noninvasive method for determining the timing of the opening of the aortic valve, an important event used for measuring preejection period, which reflects sympathetic beta-adrenergic influences on the heart. Automatic detection of the exact time of the opening of the aortic valve (B point on the impedance cardiogram) has proven to be challenging as its appearance varies between and within individuals and may manifest as a reversal, inflection, or rapid slope change of the thoracic impedance derivative's (dZ/dt) rapid rise...
March 7, 2018: Psychophysiology
https://www.readbyqxmd.com/read/29477547/challenge-and-threat-states-examining-cardiovascular-cognitive-and-affective-responses-to-two-distinct-laboratory-stress-tasks
#16
Gavin P Trotman, Sarah E Williams, Mary L Quinton, Jet J C S Veldhuijzen van Zanten
BACKGROUND: The theory of challenge and threat states in athletes (TCTSA) proposes psychological antecedents will predict psychological and cardiovascular responses to stress. The present study investigated this theory in two contextually different stress tasks. METHOD: 78 males completed a computerised competition and a public speaking task. Cardiovascular activity was measured with impedance cardiography and a blood pressure monitor. Challenge and threat antecedents, indicators of challenge and threat and emotions were assessed pre- and post-tasks...
April 2018: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/29476697/salbutamol-induced-decrease-in-augmentation-index-is-related-to-the-parallel-increase-in-heart-rate
#17
Antti J Tikkakoski, Pauliina Kangas, Lauri Suojanen, Anna M Tahvanainen, Arttu Eräranta, Mika A P Kähönen, Kalle Sipilä, Jukka T Mustonen, Ilkka H Pörsti
The change in augmentation index following salbutamol inhalation has been applied to evaluate endothelial function. We examined the contribution of salbutamol-induced increase in heart rate to the observed decrease in augmentation index. Haemodynamics were recorded using whole-body impedance cardiography and continuous pulse wave analysis from tonometric radial blood pressure. All subjects (n = 335, mean age 46, body mass index 26, 48% men) were without medications with cardiovascular influences. The effects of salbutamol inhalation (0...
February 24, 2018: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/29475204/time-frequency-features-for-impedance-cardiography-signals-during-anesthesia-using-different-distribution-kernels
#18
Jesús Escrivá Muñoz, Pedro Gambús, Erik W Jensen, Montserrat Vallverdú
OBJECTIVE: This works investigates the time-frequency content of impedance cardiography signals during a propofol-remifentanil anesthesia. MATERIALS AND METHODS: In the last years, impedance cardiography (ICG) is a technique which has gained much attention. However, ICG signals need further investigation. Time-Frequency Distributions (TFDs) with 5 different kernels are used in order to analyze impedance cardiography signals (ICG) before the start of the anesthesia and after the loss of consciousness...
January 2018: Methods of Information in Medicine
https://www.readbyqxmd.com/read/29470788/commentary-using-impedance-cardiography-to-detect-asymptomatic-cardiovascular-disease-in-prehypertensive-adults-with-risk-factors
#19
Arthur P DeMarzo
New guidelines on hypertension eliminated the classification of prehypertension and divided those blood pressure (BP) levels into elevated BP and stage 1 hypertension. For elevated BP, this study showed that cardiovascular (CV) abnormalities were prevalent in adults over 40 years of age with at least 2 CV risk factors. Detecting abnormalities of the CV system moves a patient from being at high risk to having earlystage cardiovascular disease (CVD) and supports a decision to treat. By redefining stage 1 and lowering the target BP, the new guidelines have set an ambitious goal for early intervention to prevent progression of CVD...
February 22, 2018: High Blood Pressure & Cardiovascular Prevention: the Official Journal of the Italian Society of Hypertension
https://www.readbyqxmd.com/read/29464553/heart-work-after-errors-behavioral-adjustment-following-error-commission-involves-cardiac-effort
#20
Iris M Spruit, Tom F Wilderjans, Henk van Steenbergen
Posterror slowing (PES) is the observation that people respond slower on trials subsequent to error commissions than on trials subsequent to correct responses. Different accounts have been proposed to explain PES. On the one hand, it has been suggested that PES arises from an adaptive increase in cognitive control following error commission, thereby making people more cautious after making an error. On the other hand, PES has been attributed to an orienting response, indicating that attention is shifted toward the error...
April 2018: Cognitive, Affective & Behavioral Neuroscience
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