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Franzoni L, Oliveira RCD, Busin D, Turella DJP, Costa RR, Saffi MAL, Silveira ADD, Stein R. Non-Invasive Assessment of Cardiodynamics by Impedance Cardiography during the Six-Minute Walk Test in Patients with Heart Failure. Arq Bras Cardiol 2023; 120:e20230087. [PMID: 38232243 DOI: 10.36660/abc.20230087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 09/21/2023] [Indexed: 01/19/2024] Open
Abstract
BACKGROUND Central Illustration: Non-Invasive Assessment of Cardiodynamics by Impedance Cardiography during the Six-Minute Walk Test in Patients with Heart Failure. The six-minute walk test (6MWT) is commonly used to evaluate heart failure (HF) patients. However, several clinical factors can influence the distance walked in the test. Signal-morphology impedance cardiography (SM-ICG) is a useful tool to noninvasively assess hemodynamics. OBJECTIVE This study aimed to compare cardiac output (CO), heart rate (HR), and stroke volume (SV) acceleration and deceleration responses to 6MWT in individuals with HF and reduced ejection fraction (HFrEF) and healthy controls. METHODS This is a cross-sectional observational study. CO, HR, SV and cardiac index (CI) were evaluated before, during, and after the 6MWT assessed by SM-ICG. The level of significance adopted in the statistical analysis was 5%. RESULTS Twenty-seven participants were included (13 HFrEF and 14 healthy controls). CO and HR acceleration significantly differed between groups (p<0.01; p=0.039, respectively). We found significant differences in SV, CO and CI between groups (p<0.01). Linear regression showed an impaired SV contribution to CO change in HFrEF group (22.9% versus 57.4%). CONCLUSION The main finding of the study was that individuals with HFrEF showed lower CO and HR acceleration values during the submaximal exercise test compared to healthy controls. This may indicate an imbalance in the autonomic response to exercise in this condition.
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Affiliation(s)
- Leandro Franzoni
- Programa de Pós-Graduação em Ciências da Saúde: Cardiologia e Ciências Cardiovasculares ( UFRGS ), Porto Alegre , RS - Brasil
| | - Rafael Cechet de Oliveira
- Programa de Pós-Graduação em Ciências da Saúde: Cardiologia e Ciências Cardiovasculares ( UFRGS ), Porto Alegre , RS - Brasil
| | - Diego Busin
- Universidade de Caxias do Sul , Caxias do Sul , RS - Brasil
| | | | - Rochelle Rocha Costa
- Universidade de Brasília - Programa de Pós-Graduação em Educação Física , Porto Alegre , RS - Brasil
| | | | | | - Ricardo Stein
- Programa de Pós-Graduação em Ciências da Saúde: Cardiologia e Ciências Cardiovasculares ( UFRGS ), Porto Alegre , RS - Brasil
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Stroke volume and cardiac output during 6 minute-walk tests are strong predictors of maximal oxygen uptake in people after stroke. PLoS One 2022; 17:e0273794. [PMID: 36040986 PMCID: PMC9426911 DOI: 10.1371/journal.pone.0273794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 08/15/2022] [Indexed: 11/19/2022] Open
Abstract
Background and objectives
The 6-minute walk test (6MWT) is a field test commonly used to predict peak oxygen consumption (VO2peak) in people after stroke. Inclusion of cardiodynamic variables measured by impedance cardiography (ICG) during a 6MWT has been shown to improve prediction of VO2peak in healthy adults but these data have not been considered in people after stroke. This study investigates whether the prediction of VO2peak can be improved by the inclusion of cardiovascular indices derived by impedance cardiography (ICG) during the 6MWT in people after stroke.
Methods
This was a cross-sectional study. Patients diagnosed with stroke underwent in random order, a maximal cardiopulmonary exercise test (CPET) and 6MWT in separate dates. Heart rate (HR), stroke volume (SV) and cardiac output (CO) were measured by ICG during all tests. Oxygen consumption was recorded by a metabolic cart during the CPET. Recorded data were subjected to multiple regression analyses to generate VO2peak prediction equations.
Results
Fifty-nine patients, mean age 50.0±11.7 years were included in the analysis. The mean distance covered in the 6MWT (6MWD) was 294±13 m, VO2peak was 19.2±3.2 ml/min/kg. Mean peak HR, SV and CO recorded during 6MWT were 109±6 bpm, 86.3±8.8 ml, 9.4±1.2 L/min and during CPET were 135±14 bpm, 86.6±9 ml, 11.7±2 L/min respectively. The prediction equation with inclusion of cardiodynamic variables: 16.855 + (-0.060 x age) + (0.196 x BMI) + (0.01 x 6MWD) + (-0.416 x SV6MWT) + (3.587 x CO 6MWT) has a higher squared multiple correlation (R2) and a lower standard error of estimate (SEE) and SEE% compared to the equation using 6MWD as the only predictor.
Conclusion
Inclusion of SV and CO measured during the 6MWT in stroke patients further improved the VO2peak prediction power compared to using 6MWD as a lone predictor.
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Cardiodynamic variables measured by impedance cardiography during a 6-minute walk test are reliable predictors of peak oxygen consumption in young healthy adults. PLoS One 2021; 16:e0252219. [PMID: 34032813 PMCID: PMC8148309 DOI: 10.1371/journal.pone.0252219] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 05/12/2021] [Indexed: 11/19/2022] Open
Abstract
Accurate prediction of aerobic capacity is necessary to guide appropriate exercise prescription. It is common to use 6-minute walk distance (6MWD) to predict peak oxygen uptake (VO2peak) in the clinical environment. The aim of this study was to determine whether prediction of VO2peak can be improved by the inclusion of cardiovascular indices derived by impedance cardiography (ICG) during the 6MWT. A total of 62 healthy university students aged 21±1 years completed in separate days, a cardiopulmonary exercise test (CPET) and two 6MWTs (30 min apart), during which heart rate (HR), stroke volume (SV) and cardiac output (CO) were measured by ICG (PhysioFlow® PF07 EnduroTM). The CPET was conducted with the Ergoselect 200 Ergoline and oxygen consumption measured by a MasterScreenTM CPX breath-by-breath metabolic cart. Multiple regression analyses were conducted to generate VO2peak prediction equations using 6MWD with, or without the cardiovascular indices recorded at the end of the best performed 6MWT as predictor variables. The mean peak HR (bpm), SV (ml) and CO (L/min) recorded during 6MWT were 156±18, 95.6±9, 15±2.8 and during CPET were 176±16, 91.3±8, 16.2±2.7, respectively. Analyses revealed the following VO2peak prediction equation: VO2peak = 100.297+(0.019x6MWD)+(-0.598xHR6MWT)+(-1.236xSV6MWT) + (8.671 x CO6MWT). This equation has a squared multiple correlation (R2) of 0.866, standard error of the estimate (SEE) of 2.28 mL/kg/min and SEE:VO2peak (SEE%) of 7.2%. Cross-validation of equation stability using predicted residual sum of squares (PRESS) statistics showed a R2 (Rp2), SEE (SEEp) and SEEp% of 0.842, 2.38 mL/kg/min and 7.6% respectively. The minimal shrinkage of R2 implied regression model stability. Correlation between measured and predicted VO2peak using this equation was strong (r = 0.931, p<0.001). When 6MWD alone was used as the predictor for VO2peak, the generated equation had a lower R2 (0.549), and a higher SEE (4.08 mL/kg/min) and SEE% (12.9%). This is the first study which included cardiac indices during a 6MWT as variables for VO2peak prediction. Our results suggest that inclusion of cardiac indices measured during the 6MWT more accurately predicts VO2peak than using 6MWD data alone.
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Liu F, Jones AYM, Tsang RCC, Wang Y, Zhou J, Zhou M, Wang Y. Noninvasive investigation of the cardiodynamic response to 6MWT in people after stroke using impedance cardiography. PLoS One 2020; 15:e0233000. [PMID: 32555655 PMCID: PMC7299376 DOI: 10.1371/journal.pone.0233000] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2019] [Accepted: 04/26/2020] [Indexed: 11/29/2022] Open
Abstract
This is a cross-section observational study that investigated the cardiodynamic response to a 6-minute walk test (6MWT) in patients after stroke using impedance cardiography (ICG). Patients diagnosed with stroke were invited to participate in a 6MWT on consecutive days. Heart rate (HR), cardiac output (CO), stroke volume (SV) and cardiac index (CI) were measured by ICG using the PhysioFlow® PF07 EnduroTM at 1-second intervals for 10 minutes prior to, during and for 10 minutes after each 6MWT. Oxygen saturation, perceived exertion score (modified Borg scale) and the distance covered at the end of each 6MWT were recorded. Twenty-nine patients (mean age 55.6±10.9 years) completed the study. The mean duration of stroke after diagnosis was 14.4±19.1 months. There were no differences in the measured data between the first and second 6MWT (mean intraclass correlation coefficient (ICC) range: 0.87–0.95). The 6 minute walk distance (6WMD) covered in the two 6MWTs was 246±126 and 255±130m respectively (p>0.05). Mean measured data for each subject at rest, and at the end of the better performed 6MWT were, respectively: HR 78±11 and 100±18 bpm; CO 5.5±1.2 and 8.9±2.6 l/min, SV 71.3±16 and 89.3±18.6 ml/beat and CI 3.0±0.6 and 4.9±1.3 l/min/m2. After commencement of the 6MWT, the increase in SV took 30 sec before the rise approaching a plateau, whereas HR, CO and CI continued to rise steeply for 90 sec before leveling off to a steady rise. After completion of the 6MWT, all parameters had returned to baseline by a mean of 3.5 min. Sub-group analysis showed that the increase in cardiac output was predominantly contributed by an increase in heart rate in participants diagnosed with stroke for less than 1 year, whereas both stroke volume and heart rate contributed similarly to the increase in cardiac output in participants with diagnosis of stroke for longer than 1 year. Systolic blood pressure (SBP) and diastolic blood pressure (DBP) both returned to baseline within 2 minutes post 6MWT. HR recorded at the end of the 6MWT was 60.8±10.6% of the predicted maximal heart rate and perceived exertion score was 5±2. Correlations between 6MWD and HR, and between 6MWD and SV were weak, with correlation coefficients Spearman’s rho (rs) =0.46, and 0.42, respectively (p<0.05). Correlation between 6MWD and CO and CI were higher (rs= 0.66 and 0.63, respectively (p<0.01)). This is the first study to report cardiac responses during a 6MWT in stroke patients. ICG is a reliable, non-invasive, repeatable method of measuring cardiodynamic data in stroke patients.
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Affiliation(s)
- Fang Liu
- Department of Rehabilitation, Health Science Center,Shenzhen Second People’s Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen, China
| | - Alice Y. M. Jones
- School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, QLD, Australia
- Faculty of Health Sciences, The University of Sydney, Sydney, NSW, Australia
- * E-mail:
| | - Raymond C. C. Tsang
- Department of Physiotherapy, MacLehose Medical Rehabilitation Centre, Hong Kong, Hong Kong
| | - Yao Wang
- Department of Rehabilitation, Health Science Center,Shenzhen Second People’s Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen, China
- Department of Rehabilitation, Shenzhen Dapeng New District Nan'ao People's Hospital, Shenzhen, China
| | - Jing Zhou
- Department of Rehabilitation, Health Science Center,Shenzhen Second People’s Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen, China
| | - Mingchao Zhou
- Department of Rehabilitation, Health Science Center,Shenzhen Second People’s Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen, China
| | - Yulong Wang
- Department of Rehabilitation, Health Science Center,Shenzhen Second People’s Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen, China
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Latest Advances in Cardiac Output Monitoring from High-Definition Impedance Cardiography. CURRENT ANESTHESIOLOGY REPORTS 2018. [DOI: 10.1007/s40140-018-0271-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Mugii N, Someya F. Cardiopulmonary factors affecting 6-min walk distance in patients with idiopathic inflammatory myopathies. Rheumatol Int 2018; 38:1443-1448. [PMID: 29761224 PMCID: PMC6060817 DOI: 10.1007/s00296-018-4050-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 05/10/2018] [Indexed: 12/03/2022]
Abstract
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. The patients were also examined by the pulmonary function test for forced vital capacity and diffusing capacity for carbon monoxide (DLCO), and by echocardiography for left ventricular ejection fraction and right ventricular systolic pressure. Interstitial lung disease was diagnosed in 19 patients using high-resolution computed tomography. There was no difference in 6-min walk distance or cardiac output after walking between the patients and healthy controls. However, stroke volume during the 6-min walk test was significantly lower in the patients than in healthy controls, suggesting malfunction in the heart. Moreover, the increased heart rate matched the cardiac output. Spearman’s correlation analysis demonstrated a correlation between 6-min walk distance and stroke volume, cardiac output after walking and DLCO, but not left ventricular ejection fraction or right ventricular systolic pressure, as this study lacked the patients with pulmonary hypertension. In conclusion, impaired DLCO due to interstitial lung disease was suggested to be a fundamental parameter affecting exercise capacity, in addition to heart involvement, in patients with idiopathic inflammatory myopathies.
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Affiliation(s)
- Naoki Mugii
- Division of Health Science, Kanazawa University Graduate School of Medical Science, Kanazawa, Japan
| | - Fujiko Someya
- School of Health Sciences, Kanazawa University, Kodatsuno 5-11-80, Kanazawa, 920-0942, Japan.
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Falls R, Seman M, Braat S, Sortino J, Allen JD, Neil CJ. Inorganic nitrate as a treatment for acute heart failure: a protocol for a single center, randomized, double-blind, placebo-controlled pilot and feasibility study. J Transl Med 2017; 15:172. [PMID: 28789663 PMCID: PMC5549289 DOI: 10.1186/s12967-017-1271-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2016] [Accepted: 07/24/2017] [Indexed: 01/07/2023] Open
Abstract
Background Acute heart failure (AHF) is a frequent reason for hospitalization worldwide and effective treatment options are limited. It is known that AHF is a condition characterized by impaired vasorelaxation, together with reduced nitric oxide (NO) bioavailability, an endogenous vasodilatory compound. Supplementation of inorganic sodium nitrate (NaNO3) is an indirect dietary source of NO, through bioconversion. It is proposed that oral sodium nitrate will favorably affect levels of circulating NO precursors (nitrate and nitrite) in AHF patients, resulting in reduced systemic vascular resistance, without significant hypotension. Methods and outcomes We propose a single center, randomized, double-blind, placebo-controlled pilot trial, evaluating the feasibility of sodium nitrate as a treatment for AHF. The primary hypothesis that sodium nitrate treatment will result in increased systemic levels of nitric oxide pre-cursors (nitrate and nitrite) in plasma, in parallel with improved vasorelaxation, as assessed by non-invasively derived systemic vascular resistance index. Additional surrogate measures relevant to the known pathophysiology of AHF will be obtained in order to assess clinical effect on dyspnea and renal function. Discussion The results of this study will provide evidence of the feasibility of this novel approach and will be of interest to the heart failure community. This trial may inform a larger study.
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Affiliation(s)
- Roman Falls
- Western Centre for Health Research and Education, Western Health, Melbourne, Australia.,Department of Medicine-Western Health, Melbourne Medical School, The University of Melbourne, Melbourne, Australia
| | - Michael Seman
- Western Centre for Health Research and Education, Western Health, Melbourne, Australia.,Department of Medicine-Western Health, Melbourne Medical School, The University of Melbourne, Melbourne, Australia
| | - Sabine Braat
- Department of Medicine-Western Health, Melbourne Medical School, The University of Melbourne, Melbourne, Australia.,Melbourne School of Population and Global Health and Melbourne Clinical and Translational Sciences Platform (MCATS), Parkville, Australia
| | - Joshua Sortino
- Western Centre for Health Research and Education, Western Health, Melbourne, Australia
| | - Jason D Allen
- Western Centre for Health Research and Education, Western Health, Melbourne, Australia.,Clinical Exercise Science Research Program, Institute of Sport Exercise and Active Living (ISEAL), Melbourne, Australia
| | - Christopher J Neil
- Western Centre for Health Research and Education, Western Health, Melbourne, Australia. .,Department of Medicine-Western Health, Melbourne Medical School, The University of Melbourne, Melbourne, Australia. .,Clinical Exercise Science Research Program, Institute of Sport Exercise and Active Living (ISEAL), Melbourne, Australia. .,Western Health Cardiology, Footscray Hospital, Gordon St, Locked Bag 2, Footscray, VIC, 3011, Australia.
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Panagiotou M, Vogiatzis I, Jayasekera G, Louvaris Z, Mackenzie A, Mcglinchey N, Baker JS, Church AC, Peacock AJ, Johnson MK. Validation of impedance cardiography in pulmonary arterial hypertension. Clin Physiol Funct Imaging 2017; 38:254-260. [DOI: 10.1111/cpf.12408] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Accepted: 11/11/2016] [Indexed: 11/28/2022]
Affiliation(s)
- Marios Panagiotou
- Scottish Pulmonary Vascular Unit; Golden Jubilee National Hospital; Glasgow UK
| | - Ioannis Vogiatzis
- Faculty of Physical Education and Sports Sciences; National and Kapodistrian University of Athens; Athens Greece
- Faculty of Health and Life Sciences; Department of Sport; Exercise and Rehabilitation; Northumbria University; Newcastle UponTyne UK
| | - Geeshath Jayasekera
- Scottish Pulmonary Vascular Unit; Golden Jubilee National Hospital; Glasgow UK
| | - Zafeiris Louvaris
- Faculty of Physical Education and Sports Sciences; National and Kapodistrian University of Athens; Athens Greece
- Faculty of Kinesiology and Rehabilitation Sciences; Department of Rehabilitation Sciences KU Leuven; Division of Respiratory Rehabilitation; University Hospitals Leuven; Belgium
| | - Alison Mackenzie
- Scottish Pulmonary Vascular Unit; Golden Jubilee National Hospital; Glasgow UK
| | - Neil Mcglinchey
- Scottish Pulmonary Vascular Unit; Golden Jubilee National Hospital; Glasgow UK
| | - Julien S. Baker
- Institute of Clinical Exercise and Health Science; University of the West of Scotland; Hamilton UK
| | - Alistair C. Church
- Scottish Pulmonary Vascular Unit; Golden Jubilee National Hospital; Glasgow UK
| | - Andrew J. Peacock
- Scottish Pulmonary Vascular Unit; Golden Jubilee National Hospital; Glasgow UK
| | - Martin K. Johnson
- Scottish Pulmonary Vascular Unit; Golden Jubilee National Hospital; Glasgow UK
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Ha D, Mazzone PJ, Ries AL, Malhotra A, Fuster M. The Utility of Exercise Testing in Patients with Lung Cancer. J Thorac Oncol 2016; 11:1397-410. [PMID: 27156441 DOI: 10.1016/j.jtho.2016.04.021] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 04/25/2016] [Accepted: 04/26/2016] [Indexed: 12/25/2022]
Abstract
The harm associated with lung cancer treatment include perioperative morbidity and mortality and therapy-induced toxicities in various organs, including the heart and lungs. Optimal treatment therefore entails a need for risk assessment to weigh the probabilities of benefits versus harm. Exercise testing offers an opportunity to evaluate a patient's physical fitness/exercise capacity objectively. In lung cancer, it is most often used to risk-stratify patients undergoing evaluation for lung cancer resection. In recent years, its use outside this context has been described, including in nonsurgical candidates and lung cancer survivors. In this article we review the physiology of exercise testing and lung cancer. Then, we assess the utility of exercise testing in patients with lung cancer in four contexts (preoperative evaluation for lung cancer resection, after lung cancer resection, lung cancer prognosis, and assessment of efficiency of exercise training programs) after systematically identifying original studies involving the most common forms of exercise tests in this patient population: laboratory cardiopulmonary exercise testing and simple field testing with the 6-minute walk test, shuttle walk test, and/or stair-climbing test. Lastly, we propose a conceptual framework for risk assessment of patients with lung cancer who are being considered for therapy and identify areas for further studies in this patient population.
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Affiliation(s)
- Duc Ha
- Division of Pulmonary, Critical Care, and Sleep Medicine, University of California San Diego, La Jolla, California.
| | | | - Andrew L Ries
- Division of Pulmonary, Critical Care, and Sleep Medicine, University of California San Diego, La Jolla, California
| | - Atul Malhotra
- Division of Pulmonary, Critical Care, and Sleep Medicine, University of California San Diego, La Jolla, California
| | - Mark Fuster
- Division of Pulmonary, Critical Care, and Sleep Medicine, University of California San Diego, La Jolla, California; Pulmonary and Critical Care Medicine Section, Veterans Administration San Diego Healthcare System, San Diego, California
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Electrical Bioimpedance Spectroscopy on Acute Unilateral Stroke Patients: Initial Observations regarding Differences between Sides. BIOMED RESEARCH INTERNATIONAL 2015; 2015:613247. [PMID: 26557680 PMCID: PMC4628745 DOI: 10.1155/2015/613247] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 05/18/2015] [Indexed: 01/10/2023]
Abstract
PURPOSE Electrical Bioimpedance Cerebral Monitoring is assessment in real time of health of brain tissue through study of passive dielectric properties of brain. During the last two decades theory and technology have been developed in parallel with animal experiments aiming to confirm feasibility of using bioimpedance-based technology for prompt detection of brain damage. Here, for the first time, we show that electrical bioimpedance measurements for left and right hemispheres are significantly different in acute cases of unilateral stroke within 24 hours from onset. METHODS Electrical BIS measurements have been taken in healthy volunteers and patients suffering from acute stroke within 24 hours of onset. BIS measurements have been obtained using SFB7 bioimpedance spectrometer manufactured by Impedimed ltd. and 4-electrode method. Measurement electrodes, current, and voltage have been placed according to 10-20 EEG system obtaining mutual BIS measurements from 4 different channels situated in pairs symmetrically from the midsagittal line. Obtained BIS data has been analyzed, assessing for symmetries and differences regarding healthy control data. RESULTS 7 out of 10 patients for Side-2-Side comparisons and 8 out 10 for central/lateral comparison presented values outside the range defined by healthy control group. When combined only 1 of 10 patients exhibited values within the healthy range. CONCLUSIONS If these initial observations are confirmed with more patients, we can foresee emerging of noninvasive monitoring technology for brain damage with the potential to lead to paradigm shift in treatment of brain stroke and traumatic brain damage.
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Comparison of electrical velocimetry and cardiac magnetic resonance imaging for the non-invasive determination of cardiac output. J Clin Monit Comput 2015; 30:399-408. [DOI: 10.1007/s10877-015-9731-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Accepted: 06/23/2015] [Indexed: 10/23/2022]
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Tonelli AR, Wang XF, Alkukhun L, Zhang Q, Dweik RA, Minai OA. Heart rate slopes during 6-min walk test in pulmonary arterial hypertension, other lung diseases, and healthy controls. Physiol Rep 2014; 2:2/6/e12038. [PMID: 24920122 PMCID: PMC4208645 DOI: 10.14814/phy2.12038] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Six-minute walk test (6MWT) continues to be a useful tool to determine the functional capacity in patients with vascular and other lung diseases; nevertheless, it has a limited ability to predict prognosis in this context. We tested whether the heart rate (HR) acceleration and decay slopes during the 6-m walk test are different in patients with pulmonary arterial hypertension (PAH), other lung diseases, and healthy controls. In addition, we assessed whether the HR slopes are associated with clinical worsening. Using a portable, signal-morphology-based, impedance cardiograph (PhysioFlow Enduro, Paris, France) with real-time wireless monitoring via a Bluetooth USB adapter we determined beat-by-beat HR. We included 50 subjects in this pilot study, 20 with PAH (all on PAH-specific treatment), 17 with other lung diseases (obstructive [n = 12, 71%] or restrictive lung diseases [5, 29%]), and 13 healthy controls. The beat-by-beat HR curves were significantly different among all three groups of subjects either during the activity or recovery of the 6MWT. HR curves were less steep in PAH than the other two groups (P < 0.001). HR acceleration rates were slower in patients with PAH or other lung diseases with progression of their disease (P < 0.001). In conclusion, the acceleration and decay slopes during 6MWT are different among patients with PAH, other lung diseases, and healthy controls. The HR slopes during 6MWT were steeper in patients without clinical worsening.
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Affiliation(s)
- Adriano R Tonelli
- Department of Pulmonary, Allergy and Critical Care Medicine, Respiratory Institute, Cleveland Clinic, Cleveland, Ohio
| | - Xiao-Feng Wang
- Respiratory Institute Biostatistics Core, Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio
| | - Laith Alkukhun
- Department of Pulmonary, Allergy and Critical Care Medicine, Respiratory Institute, Cleveland Clinic, Cleveland, Ohio
| | - Qi Zhang
- Respiratory Institute Biostatistics Core, Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio
| | - Raed A Dweik
- Department of Pulmonary, Allergy and Critical Care Medicine, Respiratory Institute, Cleveland Clinic, Cleveland, Ohio
| | - Omar A Minai
- Department of Pulmonary, Allergy and Critical Care Medicine, Respiratory Institute, Cleveland Clinic, Cleveland, Ohio
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