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Impedance cardiography

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https://www.readbyqxmd.com/read/28902662/circadian-hemodynamics-in-men-and-women-with-high-blood-pressure-dipper-vs-nondipper-and-racial-differences
#1
Andrew Sherwood, LaBarron K Hill, James A Blumenthal, Alan L Hinderliter
OBJECTIVE: The 'nondipping' pattern of circadian blood pressure (BP) variation is an established independent predictor of adverse cardiovascular outcomes. Although this phenomenon has been widely studied, its underlying circadian hemodynamics of cardiac output and systemic vascular resistance (SVR) have not been well characterized. We evaluated the hypothesis that BP nondipping would be associated with a blunted night-time reduction in SVR in a biracial sample of 140 (63 African-American and 77 white) men and women with elevated clinic BP (130-159/85-99 mmHg)...
September 11, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28895755/hemodynamic-characterization-of-hypertensive-patients-with-an-exaggerated-orthostatic-blood-pressure-variation
#2
Jessica Barochiner, Lucas S Aparicio, José Alfie, Marcelo A Rada, Margarita S Morales, Carlos R Galarza, Paula E Cuffaro, Marcos J Marín, Rocío Martínez, Gabriel D Waisman
Exaggerated orthostatic blood pressure variation (EOV) is a poorly understood phenomenon related to high cardiovascular risk. We aimed to determine whether hypertensive patients with EOV have a distinct hemodynamic pattern, assessed through impedance cardiography. METHODS: In treated hypertensive patients, we measured the cardiac index (CI), systemic vascular resistance index (SVRI), blood pressure (BP), and heart rate (HR) in the supine and standing (after 3 minutes) positions, defining three groups according to BP variation: 1) Normal orthostatic BP variation (NOV): standing systolic BP (stSBP)-supine systolic BP (suSBP) between -20 and 20 mmHg and standing diastolic BP (stDBP)-supine diastolic BP (suDBP) between -10 and 10 mmHg; 2) orthostatic hypotension (OHypo): stSBP-suSBP≤-20 or stDBP-suDBP≤-10 mmHg; 3) orthostatic hypertension (OHyper): stSBP-suSBP≥20 or stDBP-suDBP≥10 mmHg...
September 12, 2017: Clinical and Experimental Hypertension: CHE
https://www.readbyqxmd.com/read/28887501/voluntary-liquorice-ingestion-increases-blood-pressure-via-increased-volume-load-elevated-peripheral-arterial-resistance-and-decreased-aortic-compliance
#3
Elina J Hautaniemi, Anna M Tahvanainen, Jenni K Koskela, Antti J Tikkakoski, Mika Kähönen, Marko Uitto, Kalle Sipilä, Onni Niemelä, Jukka Mustonen, Ilkka H Pörsti
We investigated the haemodynamic effects of two-week liquorice exposure (glycyrrhizin dose 290-370 mg/day) in 22 healthy volunteers during orthostatic challenge. Haemodynamics were recorded during passive 10-minute head-up tilt using radial pulse wave analysis, whole-body impedance cardiography, and spectral analysis of heart rate variability. Thirty age-matched healthy subjects served as controls. Liquorice ingestion elevated radial systolic (p < 0.001) and diastolic (p = 0.018) blood pressure and systemic vascular resistance (p = 0...
September 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28864438/measuring-stroke-volume-impedance-cardiography-vs-phase-contrast-magnetic-resonance-imaging
#4
Matthew Borzage, Kimia Heidari, Thomas Chavez, Istvan Seri, John C Wood, Stefan Blüml
BACKGROUND: Determination of cardiac output requires measurement of both heart rate and stroke volume. Techniques for measuring heart rate are widespread, and 1 technique for bedside monitoring of stroke volume is electrical impedance cardiography. OBJECTIVES: To determine the accuracy and precision of stroke volume measured via impedance cardiography and whether the technique can be used to detect trends. METHODS: Eleven healthy research participants (22-52 years old) were examined with simultaneous impedance cardiography and phase-contrast magnetic resonance imaging at rest and during exercise...
September 2017: American Journal of Critical Care: An Official Publication, American Association of Critical-Care Nurses
https://www.readbyqxmd.com/read/28841341/systemic-vascular-resistance-and-endogenous-inhibitors-of-nitric-oxide-synthesis-in-early-compared-to-late-onset-preeclampsia-preliminary-findings
#5
Miha Lucovnik, Helmut Karl Lackner, Ilona Papousek, Karin Schmid-Zalaudek, Guenter Schulter, Andreas Roessler, Manfred Georg Moertl
OBJECTIVE: To examine systemic vascular resistance index (SVRI), asymmetric (ADMA) and symmetric dimethylarginine (SDMA) levels in preeclampsia at different gestations. METHODS: Twenty-four preeclamptic patients (14 at ≥ 34 weeks') and 72 matched healthy controls were included. SVRI was calculated from impedance cardiography measurements. ADMA and SDMA levels were determined using enzyme-linked immunosorbent assay. RESULTS: SVRI and SDMA were higher in preeclampsia overall, in early onset and late onset compared to controls...
August 2017: Hypertension in Pregnancy
https://www.readbyqxmd.com/read/28805112/casting-doubt-on-the-value-of-assessing-the-cardiac-index-in-pregnancy
#6
Maya Ram, Anat Lavie, Shaul Lev, Yair Blecher, Uri Amikam, Yael Shulman, Tomer Avnon, Eran Weiner, Ariel Many
OBJECTIVES: The objective of this study is to assess the reliability of the cardiac index (CI) in healthy pregnant women at term by investigating the correlation between the cardiac output (CO) and the body surface area (BSA) using a novel non-invasive cardiography technique (NICaS™). METHODS: Sixty-one healthy, normotensive women with a singleton pregnancy at term (≥37 gestational weeks) participated in this prospective observational study between 1/2015 and 6/2015 L...
August 13, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28795669/-evaluation-of-volume-overload-in-critical-patients-by-monitoring-change-of-cardiac-output-under-bed-head-raising-combined-with-passive-leg-raising
#7
Long Zhang, Luhao Wang, Weixiong Luo, Meihua Mei, Youjuan Chen, Bin Ouyang
OBJECTIVE: To investigate whether the change of cardiac output (CO) with bed head raising (BHR) combined with passive leg raising (PLR) can be used to assess volume overload in critical patients. METHODS: A prospective observational diagnostic trial was designed. The patients who underwent fluid resuscitation 6 hours or more, and admitted to intensive care unit (ICU) of Meizhou People's Hospital in Guangdong Province from January to December in 2016 were enrolled...
August 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28769819/substantial-inter-subject-variability-in-blood-pressure-responses-to-glucose-in-a-healthy-non-obese-population
#8
Cathriona R Monnard, Benoît Fellay, Isabelle Scerri, Erik K Grasser
Aim: A large inter-subject variability in the blood pressure (BP) response to glucose drinks has been reported. However, the underlying factors remain elusive and we hypothesized that accompanying changes in glucose metabolism affect these BP responses. Methods: Cardiovascular and glycemic changes in response to a standard 75 g oral-glucose-tolerance-test were investigated in 30 healthy, non-obese males. Continuous cardiovascular monitoring, including beat-to-beat BP, electrocardiographically deduced heart rate and impedance cardiography, was performed during a 30 min baseline and continued up to 120 min after glucose ingestion...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28757153/hemodynamic-determinants-of-the-biological-variation-of-nt-probnp-in-patients-with-stable-systolic-chronic-heart-failure
#9
Tobias Täger, Ann-Kathrin Wiedergruen, Hanna Fröhlich, Rita Cebola, Anna Corletto, Andrea Horsch, Georg Hess, Karen Slottje, Dietmar Zdunek, Hugo A Katus, Frank H Wians, Lutz Frankenstein
BACKGROUND: Biological variation of amino-terminal probrain natriuretic peptide (NT-proBNP) in chronic heart failure (CHF) may affect blood levels and risk stratification. The sources of NT-proBNP variation are unknown. METHODS AND RESULTS: We performed NT-proBNP measurements, clinical and hemodynamic assessment in 50 patients with HFrEF who met criteria for clinical stability at 2 time intervals. Hemodynamic variables were measured using inert gas rebreathing and impedance cardiography...
July 27, 2017: Journal of Cardiac Failure
https://www.readbyqxmd.com/read/28708775/continuous-cardiac-autonomic-and-hemodynamic-responses-to-isometric-exercise
#10
Katrina A Taylor, Jonathan D Wiles, Damian D Coleman, Rajan Sharma, Jamie M Oʼdriscoll
PURPOSE: Elevated arterial blood pressure (BP) is associated with autonomic dysfunction and impaired hemodynamic control mechanisms. Isometric exercise (IE) training has been demonstrated effective at reducing BP; however, the continuous cardiovascular responses during IE are underinvestigated. We hypothesized that reflex autonomic cardiovascular control is an important mediator in reducing BP. To test our hypothesis, we investigated continuous cardiac autonomic modulation and baroreceptor reflex sensitivity (BRS) in response to IE...
August 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28681408/role-of-peripheral-vascular-resistance-as-an-indicator-of-cardiovascular-abnormalities-in-patients-with-parkinson-s-disease
#11
Monika Zawadka-Kunikowska, Joanna Słomko, Małgorzata Tafil-Klawe, Jacek J Klawe, Agnieszka Cudnoch-Jędrzejewska, Julia L Newton, Paweł Zalewski
The aim of this study was to evaluate cardiovascular autonomic modulation in response to an orthostatic stress in healthy subjects and Parkinson's disease (PD). The study included 47 controls and 56 PD patients divided into groups (vasoconstrictor PD, vasodilator PD, control) according to vasodilation/vasoconstriction response during 70° head up tilt test. Using Impedance cardiography (ICG) and electrocardiography (ECG) we measured stroke volume, cardiac output, left ventricular work index, left ventricular ejection time, acceleration index, index of contractility, Heather index, thoracic fluid content, total peripheral resistance, total arterial compliance...
July 5, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28674036/influence-of-child-and-adult-elevated-blood-pressure-on-adult-arterial-stiffness-the-cardiovascular-risk-in-young-finns-study
#12
Heikki Aatola, Teemu Koivistoinen, Heikki Tuominen, Markus Juonala, Terho Lehtimäki, Jorma S A Viikari, Olli T Raitakari, Mika Kähönen, Nina Hutri-Kähönen
Elevated blood pressure (BP) in childhood has been associated with increased adult arterial stiffness, the independent predictor of cardiovascular and all-cause mortality. The favorable BP change from childhood to adulthood and the risk of high adult arterial stiffness has not been reported. We examined the effect of child and adult BP on pulse wave velocity (PWV) assessed in adulthood among 1540 white adults followed-up for 27 years since baseline (1980, aged 6-18 years). Childhood elevated BP was defined according to the tables from the National High Blood Pressure Education Program...
September 2017: Hypertension
https://www.readbyqxmd.com/read/28642340/cardiovascular-and-cerebral-hemodynamics-during-exercise-and-recovery-in-obese-individuals-as-a-function-of-their-fitness-status
#13
Mathieu Gayda, Gabriel Lapierre, Olivier Dupuy, Sarah Fraser, Louis Bherer, Martin Juneau, Vincent Gremeaux, Anil Nigam
The aim of this study was to compare cardiovascular hemodynamics and cerebral oxygenation/perfusion (COP) during and after maximal incremental exercise in obese individuals according to their aerobic fitness versus age-matched healthy controls (AMHC). Fifty-four middle-aged obese (OB) and 16 AMHC were recruited. Maximal cardiopulmonary function (gas exchange analysis), cardiac hemodynamics (impedance cardiography), and left frontal COP (near-infrared spectroscopy: NIRS) were measured continuously during a maximal incremental ergocycle test...
June 2017: Physiological Reports
https://www.readbyqxmd.com/read/28618007/an-exploratory-study-in-healthy-male-subjects-of-the-mechanism-of-mirabegron-induced-cardiovascular-effects
#14
Marcel van Gelderen, Matthias Stölzel, John Meijer, Virginie Kerbusch, Christiane Collins, Cees Korstanje
To explore the role of β1 -adrenoceptors (ARs) in the heart rate response to the selective β3 -adrenoceptor agonist mirabegron, 12 young male volunteers received single oral doses of the nonselective β1/2 -AR antagonist propranolol (160 mg), the selective β1 -AR antagonist bisoprolol (10 mg), or placebo on days 1 and 5 of each period in a 3-period crossover study. On day 5, dosing was followed by a supratherapeutic dose of mirabegron (200 mg). Vital signs, impedance cardiography, and plasma renin activity were collected...
June 15, 2017: Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/28597621/hemodynamic-adaptation-to-training-in-visually-impaired-professional-tandem-cyclists
#15
Anna M Kamelska, Krzysztof L Mazurek, Jacek J Nowakowski
BACKGROUND: Cycling is one of the disciplines with the greatest training-induced volumetric changes in cardiovascular systems. The aim of the study was to evaluate the hemodynamic adaptation to 7-month routine training in athletes with and without severe visual impairment. METHODS: The study involved 26 men: visually impaired (VI) (n = 13; 37±12.2 years) and properly sighted (PS) (n = 13; 41±12.8 years) elite tandem-cycling athletes. They underwent hemodynamic variables monitoring at rest and during exercise test by impedance cardiography (ICG), before (in the middle of the transition period) and after 7-month cycling training (at the beginning of the competitive period)...
June 8, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28561596/higher-exercise-intensity-delays-postexercise-recovery-of-impedance-derived-cardiac-sympathetic-activity
#16
Scott Michael, Ollie Jay, Kenneth S Graham, Glen M Davis
Systolic time intervals (STIs) provide noninvasive insights into cardiac sympathetic neural activity (cSNA). As the effect of exercise intensity on postexercise STI recovery is unclear, this study investigated the STI recovery profile after different exercise intensities. Eleven healthy males cycled for 8 min at 3 separate intensities: LOW (40%-45%), MOD (75%-80%), and HIGH (90%-95%) of heart-rate (HR) reserve. Bio-impedance cardiography was used to assess STIs - primarily pre-ejection period (PEP; inversely correlated with cSNA), as well as left ventricular ejection time (LVET) and PEP:LVET - during 10 min seated recovery immediately postexercise...
May 31, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28532415/hemodynamic-changes-caused-by-acupuncture-in-healthy-volunteers-a-prospective-single-arm-exploratory-clinical-study
#17
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/28522275/impact-of-continuous-positive-airway-pressure-on-left-ventricular-systolic-loading-and-coronary-flow-reserve-in-healthy-young-men
#18
Volker Schulze, Christian Meyer, Christian Eickholt, Roberto Sansone, Stefanie Keymel, Christian Heiss, Tienush Rassaf, Malte Kelm, Stephan Steiner
BACKGROUND: Increased augmentation index (AIx) is accompanied by an elevated cardiovascular risk. A reduction of AIx is known for long-term continuous positive airway pressure (CPAP) therapy. We hypothesised that acute preload and left ventricular workload effects AIx and subendocardial viability ratio (SEVR) as a marker of coronary flow reserve. METHODS: Increased augmentation index and central blood pressure parameters were measured by radial artery tonometry in 17 healthy men (32/±6years) at rest and during CPAP ventilation at pressures of 5, 10mbar and after recovery...
March 31, 2017: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/28455826/subendocardial-viability-ratio-in-patients-with-rheumatoid-arthritis-comparison-with-healthy-controls-and-identification-of-prognostic-factors
#19
Panagiota Anyfanti, Areti Triantafyllou, Eugenia Gkaliagkousi, Georgios Triantafyllou, Nikolaos Koletsos, Sophia Chatzimichailidou, Panagiotis Panagopoulos, Ioannis Botis, Spyros Aslanidis, Stella Douma
Cardiac involvement is common in rheumatoid arthritis. Subendocardial viability ratio (SEVR) is a non-invasive measure of microvascular coronary perfusion, yet it remains unclear whether it is affected in rheumatoid arthritis patients. We additionally sought predictors of SEVR in rheumatoid arthritis among a wide range of disease-related parameters, cardiac and hemodynamic factors, and markers of atherosclerosis, arteriosclerosis, and endothelial dysfunction. SEVR was estimated in rheumatoid arthritis patients and healthy controls by applanation tonometry, which was also used to evaluate arterial stiffness (pulse wave velocity and augmentation index)...
June 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28438984/comparison-of-multiple-non-invasive-methods-of-measuring-cardiac-output-during-pregnancy-reveals-marked-heterogeneity-in-the-magnitude-of-cardiac-output-change-between-women
#20
John W Petersen, Jing Liu, Yueh-Yun Chi, Melissa Lingis, R Stan Williams, Alice Rhoton-Vlasak, Mark S Segal, Kirk P Conrad
Various non-invasive methods are available to measure cardiac output (CO) during pregnancy. We compared serial measures of CO using various methods to determine which provided the least variability. Ten patients with spontaneous pregnancy had estimation of CO at baseline prior to becoming pregnant and at the end of the first and third trimesters. Echocardiographic data were used to estimate CO using the Teichholz method, Simpson's biplane method, and the Doppler determined velocity time integral (VTI) method...
April 2017: Physiological Reports
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