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Cardiac output measurement

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https://www.readbyqxmd.com/read/28227618/non-invasive-cardiac-output-monitoring-in-pharmacology-a-plethysmographie-solution-in-rats
#1
Timothe Flenet, Julie Fontecave-Jallon, Stephane Tanguy, Francois Boucher, Pierre Baconnier, Pierre-Yves Gumery, Timothe Flenet, Julie Fontecave-Jallon, Stephane Tanguy, Francois Boucher, Pierre Baconnier, Pierre-Yves Gumery, Pierre-Yves Gumery, Pierre Baconnier, Stephane Tanguy, Julie Fontecave-Jallon, Francois Boucher, Timothe Flenet
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/28227221/fundamentals-of-left-ventricular-volume-representation
#2
Peter L Kerkhof, Peter L Kerkhof, Peter L Kerkhof
The volume regulation graph is meant to relate the fundamental determinants of left ventricular (LV) function, namely end-systolic volume (ESV) and end-diastolic volume (EDV). This representation permits evaluation of the LV remodeling process, convenient stratification for clinically relevant covariates, as well as inscription of iso-stroke volume (SV) and iso-ejection fraction (EF) trajectories, the latter two as linear relationships. This retrospective study discusses LV volumetric parameters obtained from 155 patients (65 females) covering a wide spectrum of heart diseases...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227126/cardiac-muscle-energetics-improved-normalisation-of-heat-using-optical-coherence-tomography
#3
Ming L Cheuk, Callum M Johnston, June-Chiew Han, Denis S Loiselle, Poul M F Nielsen, Andrew J Taberner, Ming L Cheuk, Callum M Johnston, June-Chiew Han, Denis S Loiselle, Poul M F Nielsen, Andrew J Taberner, June-Chiew Han, Callum M Johnston, Poul M F Nielsen, Ming L Cheuk, Denis S Loiselle, Andrew J Taberner
Heat liberated from isolated cardiac muscle has been used to inform us of thermo-mechanical processes that occur during a contraction. However, for comparisons between different samples to be useful, the heat output needs to be normalized to volume. We have implemented an optical coherence tomograph (OCT), together with a flow-through calorimeter, to accurately determine both muscle volume and heat in the same measurement chamber. The heat rate for multiple stimulation frequencies were recorded and normalized to the volume captured by the OCT...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227080/a-comparison-between-four-techniques-to-measure-cardiac-output
#4
A Pironet, P C Dauby, J G Chase, P Morimont, N Janssen, B Lambermont, S Davidson, T Desaive, A Pironet, P C Dauby, J G Chase, P Morimont, N Janssen, B Lambermont, S Davidson, T Desaive, T Desaive, B Lambermont, P C Dauby, N Janssen, P Morimont, A Pironet, J G Chase, S Davidson
Cardiac output is an important variable when monitoring hemodynamic status. In particular, changes in cardiac output represent the goal of several circulatory management therapies. Unfortunately, cardiac output is very difficult to estimate, either in experimental or clinical settings. The goal of this work is to compare four techniques to measure cardiac output: pressure-volume catheter, aortic flow probe, thermodilution, and the PiCCO monitor. These four techniques were simultaneously used during experiments of fluid and endotoxin administration on 7 pigs...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28219130/-the-value-of-brachial-artery-peak-velocity-variation-during-the-valsalva-maneuver-to-predict-fluid-responsiveness
#5
L F Sheng, M Yan, F J Zhang, Q S Ren, S H Yu, M Wu
Objective: To evaluate whether brachial artery peak velocity variation(ΔVp) during a Valsalva maneuver(VM) could predict fluid responsiveness in spontaneously breathing patients. Methods: Ninety-six patients required radial artery catheter for elective surgery of Ningbo Yinzhou People's Hospital from December 2014 to June 2016 were enrolled. The brachial artery Doppler signal was recorded to measure the ΔVp while the VM was performed.Then doing the volume expansion (VE) , the cardiac output variation (ΔCO) before and after VE were measured...
February 14, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28219104/captopril-does-not-potentiate-post-exercise-hypotension-a-randomized-crossover-study
#6
Andréia Cristiane Carrenho Queiroz, Julio Cesar Silva Sousa, Natan Daniel Silva, Eleonora Tobaldini, Katia Coelho Ortega, Edilamar Menezes de Oliveira, Patricia Chakur Brum, Nicola Montano, Decio Mion, Taís Tinucci, Claudia Lucia de Moraes Forjaz
To evaluate whether captopril (3×50 mg/day) potentiates post-resistance exercise hypotension (PREH) in hypertensives (HT), 12 HT men received captopril and placebo for 4 weeks each in a double-blinded, randomized-crossover design. On each therapy, subjects underwent 2 sessions: Control (C - rest) and Resistance Exercise (RE - 7 exercises, 3 sets to moderate fatigue, 50% of 1 RM -repetition maximum). Measurements were taken before and after 30-60 min (Post1) and 7 h (Post2), and ambulatory blood pressure (BP) was monitored for 24 h...
February 20, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28218213/surgical-treatment-of-double-outlet-right-ventricle-complicated-by-pulmonary-hypertension
#7
Qing-Yu Wu, Dong-Hai Li, Hong-Yin Li, Ming-Kui Zhang, Zhong-Hua Xu, Hui Xue
BACKGROUND: Double outlet right ventricle (DORV) is a group of complex congenital heart abnormalities. Preoperative pulmonary hypertension (PH) is considered an important risk factor for early death during the surgical treatment of DORV. The aim of this study was to report our experience on surgical treatment of DORV complicated by PH. METHODS: From June 2004 to November 2016, 61 patients (36 males and 25 females) aged 2 weeks to 26 years (median: 0.67 years and interquartile range: 0...
2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28210936/does-obesity-affect-the-non-invasive-measurement-of-cardiac-output-performed-by-electrical-cardiometry-in-children-and-adolescents
#8
Luis Altamirano-Diaz, Eva Welisch, Ralf Rauch, Michael Miller, Teresa Sohee Park, Kambiz Norozi
Electrical cardiometry (EC) is a non-invasive and inexpensive method for hemodynamic assessment and monitoring. However, its feasibility for widespread clinical use, especially for the obese population, has yet to be determined. In this study, we evaluated the agreement and reliability of EC compared to transthoracic Doppler echocardiography (TTE) in normal, overweight, and obese children and adolescents. We measured stroke volume (SV) and cardiac output (CO) of 131 participants using EC and TTE simultaneously...
February 17, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28209349/frequency-of-and-significance-of-physical-frailty-in-patients-with-heart-failure
#9
Quin E Denfeld, Kerri Winters-Stone, James O Mudd, Shirin O Hiatt, Christopher V Chien, Christopher S Lee
Physical frailty is an important prognostic indicator in heart failure (HF); however, few studies have examined the relation between physical frailty and invasive hemodynamics among adults with HF. The purpose of this study was to characterize physical frailty in HF in relation to invasive hemodynamics. We enrolled 49 patients with New York Heart Association class II to IV HF when participants were scheduled for a right-sided cardiac heart catheterization procedure. Physical frailty was measured according to the "frailty phenotype": shrinking, weakness, slowness, physical exhaustion, and low physical activity...
January 25, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28206993/hemodynamic-effects-of-sodium-bicarbonate-administration
#10
A C Katheria, M K Brown, K Hassan, D M Poeltler, D A Patel, V K Brown, J B Sauberan
OBJECTIVE: To describe the hemodynamic changes that occur with sodium bicarbonate (NaHCO3) administration in premature neonates. STUDY DESIGN: This retrospective study included premature neonates 23 to 31+6 weeks of gestational age who underwent continuous cardiac and cerebral monitoring as participants in prospective trials at our institution, and who received NaHCO3 infused over 30 min in the first 24 h of life. Blood pressure (BP), heart rate, cardiac output (CO), SpO2 and cerebral oximetry (StO2) were captured every 2 s...
February 16, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28202338/a-new-strategy-for-emergency-department-crowding-high-turnover-utility-bed-intervention
#11
I-Hsin Lee, Chung-Ting Chen, Yi-Tzu Lee, Yueh-Shuang Hsu, Chia-Ling Lu, Hsien-Hao Huang, Teh-Fu Hsu, Chorng-Kuang How, David Hung-Tsang Yen, Ueng-Cheng Yang
BACKGROUND: This study applied a new strategy, termed high-turnover utility bed intervention, to offer early admission chances for emergency department (ED) patients and alleviate ED crowding. METHODS: This before-and-after observational cohort study was conducted at the ED of an urban tertiary hospital. On January 1, 2012, 14 utility beds were prepared exclusively for ED patient use. A strict 48-hour course limit for each patient was formulated to govern these high-turnover beds...
February 12, 2017: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/28190549/comparing-del-nido-and-conventional-cardioplegia-in-infants-and-neonates-in-congenital-heart-surgery
#12
Kamal K Pourmoghadam, Mark Ruzmetov, Michael C O'Brien, Kurt D Piggott, Gary Plancher, Sukumar Suguna Narasimhulu, Tavya Benjamin, William M Decampli
BACKGROUND: The aim of this study was to evaluate outcome measures after the use of del Nido (dN) cardioplegia compared with conventional multidose high-potassium (non-dN) cardioplegia in neonates and infants. METHODS: We retrospectively analyzed data in patients, aged younger than 1 year, undergoing cardiopulmonary bypass (CPB) from January 2012 to August 2015. We changed our cardioplegia protocol from non-dN to dN administered in a single or infrequently dosed strategy in September 2013...
February 9, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28188408/cross-comparisons-of-trending-accuracies-of-continuous-cardiac-output-measurements-pulse-contour-analysis-bioreactance-and-pulmonary-artery-catheter
#13
Bouchra Lamia, Hyung Kook Kim, Donald A Severyn, Michael R Pinsky
We compared the similarity of cardiac-output (CO) estimates between available bolus thermodilution pulmonary-artery catheters (PAC), arterial pulse-contour analysis (LiDCOplus(™), FloTrac(™) and PiCCOplus(™)), and bioreactance (NICOM(™)). Repetitive simultaneous estimates of CO obtained from the above devices were compared in 21 cardiac-surgery patients during the first 2 h post-surgery. Mean and absolute values for CO across the devices were compared by ANOVA, Bland-Altman, Pearson moment, and linear-regression analyses...
February 10, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28187374/the-strengths-and-weaknesses-of-non-invasive-parameters-obtained-by-echocardiography-and-cardiopulmonary-exercise-testing-in-comparison-with-the-hemodynamic-assessment-by-the-right-heart-catheterization-in-patients-with-pulmonary-hypertension
#14
Katarzyna Ptaszyńska-Kopczyńska, Anna Krentowska, Emilia Sawicka, Anna Skoneczny, Małgorzata Jasiewicz, Małgorzata Knapp, Włodzimierz J Musiał, Bożena Sobkowicz, Karol A Kamiński
PURPOSE: Pulmonary hypertension (PH) diagnosis requires invasive assessment by right heart catheterization (RHC), but screening and monitoring are performed using non-invasive methods: echocardiography and cardiopulmonary exercise testing (CPET). The aim of the study was to assess correlations between the parameters obtained in non-invasive testing and RHC in patients with PH of different etiologies. MATERIAL/METHODS: The study included 53 medical records of PH patients (32 women) aged 29-81 years...
June 14, 2016: Advances in Medical Sciences
https://www.readbyqxmd.com/read/28185701/immediate-increase-of-cardiac-output-after-percutaneous-mitral-valve-repair-pmvr-determined-by-echocardiographic-and-invasive-parameters-patzelt-increase-of-cardiac-output-after-pmvr
#15
Johannes Patzelt, Yingying Zhang, Harry Magunia, Rezo Jorbenadze, Michal Droppa, Miriam Ulrich, Shanglang Cai, Henning Lausberg, Tobias Walker, Tobias Wengenmayer, Peter Rosenberger, Juergen Schreieck, Peter Seizer, Meinrad Gawaz, Harald F Langer
BACKGROUND: Successful percutaneous mitral valve repair (PMVR) in patients with severe mitral regurgitation (MR) causes changes in hemodynamics. Echocardiographic calculation of cardiac output (CO) has not been evaluated in the setting of PMVR, so far. Here we evaluated hemodynamics before and after PMVR with the MitraClip system using pulmonary artery catheterization, transthoracic (TTE) and transesophageal (TEE) echocardiography. METHODS: 101 patients with severe MR not eligible for conventional surgery underwent PMVR...
January 26, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28183863/hemodynamic-responses-are-reduced-with-aerobic-compared-with-resistance-blood-flow-restriction-exercise
#16
Anthony K May, Christopher R Brandner, Stuart A Warmington
The hemodynamics of light-load exercise with an applied blood-flow restriction (BFR) have not been extensively compared between light-intensity, BFR, and high-intensity forms of both resistance and aerobic exercise in the same participant population. Therefore, the purpose of this study was to use a randomized crossover design to examine the hemodynamic responses to resistance and aerobic BFR exercise in comparison with a common high-intensity and light-intensity non-BFR exercise. On separate occasions participants completed a leg-press (resistance) or treadmill (aerobic) trial...
February 2017: Physiological Reports
https://www.readbyqxmd.com/read/28183565/minimum-effective-fluid-volume-of-colloid-to-prevent-hypotension-during-caesarean-section-under-spinal-anesthesia-using-a-prophylactic-phenylephrine-infusion-an-up-down-sequential-allocation-study
#17
Christian Loubert, Pierre-Olivier Gagnon, Roshan Fernando
STUDY OBJECTIVE: The aim of this study was to de termine the minimum effective fluid volume (MEFV) of hydroxyethyl starch 130/0.4 (HES) infused in a preload fashion which would prevent hypotension in 50% of parturients undergoing caesarean section. A secondary objective was to measure the hemodynamic effect of fluid loading on the subjects. DESIGN: This is a prospective, double-blinded, dose-finding study using an up-down sequential allocation design. SETTING: In the operating room...
February 2017: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/28182512/preventive-physical-training-partially-preserves-heart-function-and-improves-cardiac-antioxidant-responses-in-rats-after-myocardial-infarction
#18
Maximiliano I Schaun, Leonardo Lisboa Motta, Rayane Teixeira, Fábio Klamt, Juliane Rossato, Alexandre Machado Lehnen, Maria Cláudia Irigoyen, Melissa Markoski
In acute myocardial infarction (AMI), reactive oxygen species may cause irreversible damage to the heart tissue. Physical training is capable of enhancing antioxidant capacity, acting as a cardioprotective factor. We assessed the preventive effects of physical training on the antioxidant and functional responses of the heart of Wistar Kyoto rats after AMI. Wistar Kyoto rats (n = 12) were allocated to sedentary (SED) or trained (EXE - aerobic training on a treadmill) groups. Echocardiographic exams were performed 48 h before and 48 h after the induction of AMI...
February 9, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28180030/serial-measurement-of-superior-vena-cava-flow-in-evaluation-of-the-clinical-severity-of-pial-arteriovenous-fistula-in-an-infant
#19
Mako Ago, Kenichi Masumoto, Atsushi Uchiyama, Yasuo Aihara, Yoshikazu Okada, Satoshi Kusuda
Background Pial arteriovenous fistula (AVF) is composed of one or more direct arterial feeding vessels with a single draining vein without nidus. A patient with the disease with high-flow AV shunting in the neonatal period not only suffers from high-output cardiac failure but also shows secondary neurological sequelae. In vein of Galen aneurysmal malformation, superior vena cava (SVC) flow measurements provide useful prognostic information. Case Presentation We measured serial SVC flow in a male infant with pial AVF...
January 2017: American Journal of Perinatology Reports
https://www.readbyqxmd.com/read/28176968/decreased-left-ventricular-stroke-volume-is-associated-with-low-grade-exercise-tolerance-in-patients-with-chronic-obstructive-pulmonary-disease
#20
Sumito Inoue, Yoko Shibata, Hiroyuki Kishi, Joji Nitobe, Tadateru Iwayama, Yoshinori Yashiro, Takako Nemoto, Kento Sato, Masamichi Sato, Tomomi Kimura, Akira Igarashi, Yoshikane Tokairin, Isao Kubota
BACKGROUND: Low-grade exercise tolerance is associated with a poor prognosis in patients with chronic obstructive pulmonary disease (COPD). The 6 min walk test (6MWT) is commonly used to evaluate exercise tolerance in patients with COPD. However, little is known regarding the relationship between cardiac function and exercise tolerance in patients with COPD. The aim of this study was to identify predictive factors in cardiac function for low-grade exercise tolerance in patients with stable COPD...
2017: BMJ Open Respiratory Research
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