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Impedance cardiography

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https://www.readbyqxmd.com/read/28532415/hemodynamic-changes-caused-by-acupuncture-in-healthy-volunteers-a-prospective-single-arm-exploratory-clinical-study
#1
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
#2
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
#3
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)...
April 28, 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
#4
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
https://www.readbyqxmd.com/read/28416980/comparison-of-the-measured-pre-ejection-periods-and-left-ventricular-ejection-times-between-echocardiography-and-impedance-cardiography-for-optimizing-cardiac-resynchronization-therapy
#5
Kazuki Noda, Hideaki Endo, Takahide Kadosaka, Takashi Nakata, Tasuku Watanabe, Yosuke Terui, Shoko Kajitani, Yuto Monnma, Kenjiro Sato, Masanori Kanazawa, Sota Nakajima, Masateru Kondo, Tohru Takahashi, Akihiro Nakamura, Eiji Nozaki
BACKGROUND: The pre-ejection period (PEP) and left ventricular ejection time (LVET) are easily measured by impedance cardiography (ICG). We hypothesized that the PEP/LVET measured by ICG would correlate with that measured by echocardiography, and that PEP/LVET measured by ICG would be useful for cardiac resynchronization therapy (CRT) optimization. METHODS: Newly CRT implanted patients were optimized by echocardiography. The PEP/LVET was measured by echocardiography and ICG in two different settings: optimized setting and right ventricle (RV)-only pacing...
April 2017: Journal of Arrhythmia
https://www.readbyqxmd.com/read/28408809/assessment-of-effects-of-differences-in-trunk-posture-during-fowler-s-position-on-hemodynamics-and-cardiovascular-regulation-in-older-and-younger-subjects
#6
Satoshi Kubota, Yutaka Endo, Mitsue Kubota, Tomohiko Shigemasa
BACKGROUND: Downward shifts in blood volume with changing position generally cause tachycardic responses. Age-related decreases in vagal nerve activity could contribute to orthostatic hypotension in older individuals. Fowler's position is a reclined position with the back between 30° and 60°, used to facilitate breathing, eating, and other routine daily activities in frail and elderly patients. OBJECTIVE: This study examined whether stroke volume (SV) was higher and heart rate (HR) lower in Fowler's position with an upright upper trunk than in Fowler's position with the whole trunk upright in both older and younger subjects, based on the assumption that lower HR would result from reduced sympathetic activation in older individuals...
2017: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/28394194/the-higher-the-insulin-resistance-the-lower-the-cardiac-output-in-men-with-type-1-diabetes-during-the-maximal-exercise-test
#7
Pawel Niedzwiecki, Dariusz Naskret, Stanislaw Pilacinski, Maciej Pempera, Aleksandra Uruska, Anna Adamska, Dorota Zozulinska-Ziolkiewicz
BACKGROUND: The aim of this study was to assess the hemodynamic parameters analyzed in bioimpedance cardiography during maximal exercise in patients with type 1 diabetes differing in insulin resistance. METHODS: The study group consisted of 40 men with type 1 diabetes. Tissue sensitivity to insulin was assessed on the basis of the glucose disposal rate (GDR) analyzed during hyperinsulinemic-euglycemic clamp. Patients were divided into groups with GDR <4.5 mg/kg/min (G1 group-lower insulin sensitivity) and GDR ≥4...
June 2017: Metabolic Syndrome and related Disorders
https://www.readbyqxmd.com/read/28350715/continuous-cardiac-autonomic-and-haemodynamic-responses-to-isometric-exercise
#8
Katrina A Taylor, Jonathan D Wiles, Damian D Coleman, Rajan Sharma, Jamie M O'Driscoll
PURPOSE: Elevated arterial blood pressure (BP) is associated with autonomic dysfunction and impaired haemodynamic 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...
March 27, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28256104/haemodynamic-influences-of-bisoprolol-in-hypertensive-middle-aged-men-a-double-blind-randomized-placebo-controlled-cross-over-study
#9
Lauri Suojanen, Antti Haring, Antti Tikkakoski, Jenni K Koskela, Anna M Tahvanainen, Heini Huhtala, Mika Kähönen, Kalle Sipilä, Arttu Eräranta, Jukka T Mustonen, Kari Kivistö, Ilkka H Pörsti
Treatment with beta-blockers appears to show inferior reduction in central versus peripheral blood pressure. We aimed to examine simultaneous changes in central and peripheral blood pressure, vascular resistance, cardiac function and arterial stiffness during beta-blockade. Haemodynamics were investigated after 3 weeks of bisoprolol treatment (5 mg/day) in a double-blind, randomized, placebo-controlled cross-over trial in never-treated 16 Caucasian males with grade I-II primary hypertension using continuous tonometric pulse wave analysis and whole-body impedance cardiography...
March 2, 2017: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/28255088/oral-n-acetylcysteine-and-exercise-tolerance-in-mild-chronic-obstructive-pulmonary-disease
#10
Daniel M Hirai, Joshua H Jones, Joel T Zelt, Marianne L da Silva, Robert F Bentley, Brittany Ann Edgett, Brendon James Gurd, Michael E Tschakovsky, Denis E O'Donnell, J Alberto Neder
Heightened oxidative stress is implicated in the progressive impairment of skeletal muscle vascular and mitochondrial function in chronic obstructive pulmonary disease (COPD). Whether accumulation of reactive oxygen species contribute to exercise intolerance in the early stages of COPD is unknown. We examined the effects of oral antioxidant treatment with N-acetylcysteine (NAC) on respiratory, cardiovascular and locomotor muscle function and exercise tolerance in patients with mild COPD. Thirteen patients with forced expiratory volume in one second and forced vital capacity ratio (FEV1/FVC) < lower limit of normal (LLN) and FEV1 ≥ LLN were enrolled in a double-blind, randomized crossover study to receive NAC (1800 mg/day) or placebo for 4 days...
March 2, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28251420/maladaptive-cardiac-autonomic-control-during-a-stress-reactivity-assessment-among-primary-care-patients-with-metabolic-syndrome
#11
Jonathan C Mitchell, Joyce Paulson, Maria Cannarozzi, Sandra M Neer, Jeffrey E Cassisi
Metabolic syndrome (MetS) comprises a constellation of metabolic abnormalities that substantially increase risk for chronic illnesses. Autonomic dysregulation is closely linked to MetS, and while pathophysiological models often address chronic stress exposure, none have examined how such physiological contributions operate situationally, in a clinical setting. We used ambulatory impedance cardiography to examine indicators of cardiac autonomic control (CAC) in a sample of 50 adult primary care patients with and without MetS...
March 1, 2017: Applied Psychophysiology and Biofeedback
https://www.readbyqxmd.com/read/28236352/antazoline-insights-into-drug-induced-electrocardiographic-and-hemodynamic-effects-results-of-the-elephant-ii-substudy
#12
Roman Piotrowski, Joanna Giebułtowicz, Jakub Baran, Agnieszka Sikorska, Dagmara Gralak-Łachowska, Małgorzata Soszyńska, Piotr Wroczyński, Piotr Kułakowski
BACKGROUND: Antazoline is an old antihistaminic and new antiarrhythmic agent with unknown mechanisms of action which recently has been shown to effectively terminate atrial fibrillation. The aim of study was to examine the effects of antazoline on hemodynamic and ECG parameters. METHODS: Antazoline was given intravenously in three 100 mg boluses to 10 healthy volunteers (four males, mean age 40 + 11 years). Hemodynamic and ECG parameters were measured using impedance cardiography [systolic (sBP), diastolic (dBP), mean (mBP) blood pressure, stroke volume (SV), cardiac output (CO), total peripheral resistance (TPR) and heart rate (HR), P wave, PR interval, QRS complex, QT and corrected QT (QTcF) interval]...
February 25, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/28169914/cardiac-autonomic-function-and-hot-flashes-among-perimenopausal-and-postmenopausal-women
#13
Carolyn J Gibson, Wendy Berry Mendes, Michael Schembri, Deborah Grady, Alison J Huang
OBJECTIVE: Abnormalities in autonomic function are posited to play a pathophysiologic role in menopausal hot flashes. We examined relationships between resting cardiac autonomic activity and hot flashes in perimenopausal and postmenopausal women. METHODS: Autonomic function was assessed at baseline and 12 weeks among perimenopausal and postmenopausal women (n = 121, mean age 53 years) in a randomized trial of slow-paced respiration for hot flashes. Pre-ejection period (PEP), a marker of sympathetic activation, was measured with impedance cardiography...
February 6, 2017: Menopause: the Journal of the North American Menopause Society
https://www.readbyqxmd.com/read/28168802/validation-of-impedance-cardiography-in-pulmonary-arterial-hypertension
#14
Marios Panagiotou, Ioannis Vogiatzis, Geeshath Jayasekera, Zafeiris Louvaris, Alison Mackenzie, Neil Mcglinchey, Julien S Baker, Alistair C Church, Andrew J Peacock, Martin K Johnson
BACKGROUND: Non-invasive methods of measuring cardiac output are highly desirable in pulmonary arterial hypertension (PAH). We therefore sought to validate impedance cardiography (ICG) against thermodilution (TD) and cardiac magnetic resonance (CMR) in the measurement of cardiac output in patients under investigation for PAH. METHODS: A prospective, cross-sectional study was performed to compare single-point measurements of cardiac output obtained by impedance cardiography (COICG ) technology (PhysioFlow(®) ) with (i) contemporaneous TD measurements (COTD ) at rest and steady-state exercise during right heart catheterization and (ii) CMR measurements (COCMR ) at rest obtained within 72 h...
February 6, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28160190/changes-in-cardiac-function-after-a-single-intravenous-administration-of-ckd-712-in-healthy-male-volunteers
#15
RANDOMIZED CONTROLLED TRIAL
Sang-In Park, JaeWoo Kim, Kyung-Sang Yu, In-Jin Jang, SeungHwan Lee
BACKGROUND AND OBJECTIVES: CKD-712, a candidate treatment for septic shock, acts by increasing cardiac output. This study investigated changes in the pharmacodynamics, pharmacokinetics, and tolerability of CKD-712 after a single intravenous administration. METHODS: A dose-block-randomized, double-blind, placebo-controlled, single-dose escalation study was conducted in 44 healthy subjects receiving 20, 40, 80, 160, 240, or 320 μg/kg CKD-712 or placebo. Pharmacodynamics were evaluated using computerized impedance cardiography, vital signs, platelet aggregation, and bleeding time...
April 2017: Clinical Drug Investigation
https://www.readbyqxmd.com/read/28155673/cerebral-and-neural-regulation-of-cardiovascular-activity-during-mental-stress
#16
Xiaoni Wang, Binbin Liu, Lin Xie, Xiaolin Yu, Mengjun Li, Jianbao Zhang
BACKGROUND: Mental arithmetic has been verified inducing cerebral and cardiovascular responses. However, the mechanism and sequential responses are still ambiguous. This study aims to reveal the mechanism of cardiovascular and autonomic responses and the related scalp positions that regulate the autonomic nerves system (ANS) during MA task. METHODS: 34 healthy male subjects aged between 19 and 27 years old (mean age 23.6 ± 2.3 years) were recruited in. Electrocardiogram, impedance cardiography, beat-to-beat blood pressure and electroencephalography were measured simultaneously and continuously during the experiments...
December 28, 2016: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28146577/blood-microbiome-quantity-and-the-hyperdynamic-circulation-in-decompensated-cirrhotic-patients
#17
Daniela Traykova, Beacher Schneider, Mario Chojkier, Martina Buck
BACKGROUND: Recently, a complex microbiome was comprehensibly characterized in the serum and ascitic fluid of cirrhotic patients. In the current study, we investigated for the first time the induction of inflammatory pathways and Nitric Oxide, as well as the systemic hemodynamics in conjunction with the blood microbiome in a Child-Pugh class B cirrhotic cohort. METHODS AND FINDINGS: We used the Intestinal Infections Microbial DNA qPCR Array to screen for 53 bacterial DNA from the gut in the blood...
2017: PloS One
https://www.readbyqxmd.com/read/28139018/the-influence-of-social-stress-on-time-perception-and-psychophysiological-reactivity
#18
Kathryne van Hedger, Elizabeth A Necka, Anam K Barakzai, Greg J Norman
Time perception is a fundamental component of everyday life. Although time can be measured using standard units, the relationship between an individual's experience of perceived time and a standard unit is highly sensitive to context. Stressful and threatening stimuli have been previously shown to produce time distortion effects, such that individuals perceive the stimuli as lasting for different amounts of time as compared to a standard unit. As a highly social species, humans are acutely sensitive to social stressors; however, time distortion effects have not been studied in the context of social stress...
May 2017: Psychophysiology
https://www.readbyqxmd.com/read/28103058/emotion-dysregulation-across-emotion-systems-in-attention-deficit-hyperactivity-disorder
#19
Erica D Musser, Joel T Nigg
Children with attention deficit/hyperactivity disorder (ADHD) display alterations in both emotion reactivity and regulation. One mechanism underlying such alternations may be reduced coherence among emotion systems (i.e., autonomic, facial affect). The present study sought to examine this. One hundred children (50 with ADHD combined presentation), 7-11 years of age (62% male, 78% White), completed an emotion induction and suppression task. This task was coded for facial affect behavior across both negative and positive emotion eliciting task conditions...
January 19, 2017: Journal of Clinical Child and Adolescent Psychology
https://www.readbyqxmd.com/read/28099709/preliminary-study-of-the-effects-of-furosemide-on-blood-pressure-during-late-onset-pre-eclampsia-in-patients-with-high%C3%A2-cardiac-output
#20
Péter Tamás, Eszter Hantosi, Bálint Farkas, Zsolt Ifi, József Betlehem, József Bódis
OBJECTIVE: To examine the effect of furosemide on hypertension and edema in patients with pre-eclampsia experiencing high cardiac output. METHODS: The present cohort study enrolled patients with pre-eclampsia who were admitted to the pregnancy pathology unit of the Department of Obstetrics and Gynecology, University of Pécs, Hungary, between January 1 and December 31, 2015. Eligible patients had singleton pregnancies with no fetal anomalies, high blood volume, visible edema, and a hematocrit concentration below 37 L/L...
January 2017: International Journal of Gynaecology and Obstetrics
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