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  1 / 1921 MEDLINE  
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[PMID]:28937981
[Au] Autor:Gayda M; Gremeaux V; Bherer L; Juneau M; Drigny J; Dupuy O; Lapierre G; Labelle V; Fortier A; Nigam A
[Ad] Endereço:Cardiovascular Prevention and Rehabilitation Centre (ÉPIC), Montreal Heart Institute and University of Montreal, Montreal, Quebec, Canada.
[Ti] Título:Cognitive function in patients with stable coronary heart disease: Related cerebrovascular and cardiovascular responses.
[So] Source:PLoS One;12(9):e0183791, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Chronic exercise has been shown to prevent or slow age-related decline in cognitive functions in otherwise healthy, asymptomatic individuals. We sought to assess cognitive function in a stable coronary heart disease (CHD) sample and its relationship to cerebral oxygenation-perfusion, cardiac hemodynamic responses, and [Formula: see text] peak compared to age-matched and young healthy control subjects. Twenty-two young healthy controls (YHC), 20 age-matched old healthy controls (OHC) and 25 patients with stable CHD were recruited. Cognitive function assessment included short term-working memory, perceptual abilities, processing speed, cognitive inhibition and flexibility and long-term verbal memory. Maximal cardiopulmonary function (gas exchange analysis), cardiac hemodynamic (impedance cardiography) and left frontal cerebral oxygenation-perfusion (near-infra red spectroscopy) were measured during and after a maximal incremental ergocycle test. Compared to OHC and CHD, YHC had higher [Formula: see text] peak, maximal cardiac index (CI max), cerebral oxygenation-perfusion (ΔO2 Hb, ΔtHb: exercise and recovery) and cognitive function (for all items) (P<0.05). Compared to OHC, CHD patients had lower [Formula: see text] peak, CI max, cerebral oxygenation-perfusion (during recovery) and short term-working memory, processing speed, cognitive inhibition and flexibility and long-term verbal memory (P<0.05). [Formula: see text] peak and CI max were related to exercise cerebral oxygenation-perfusion and cognitive function (P<0.005). Cerebral oxygenation-perfusion (exercise) was related to cognitive function (P<0.005). Stable CHD patients have a worse cognitive function, a similar cerebral oxygenation/perfusion during exercise but reduced one during recovery vs. their aged-matched healthy counterparts. In the all sample, cognitive functions correlated with [Formula: see text] peak, CI max and cerebral oxygenation-perfusion.
[Mh] Termos MeSH primário: Sistema Cardiovascular/fisiopatologia
Circulação Cerebrovascular/fisiologia
Cognição/fisiologia
Doença das Coronárias/diagnóstico por imagem
Doença das Coronárias/fisiopatologia
Córtex Pré-Frontal/fisiopatologia
[Mh] Termos MeSH secundário: Adulto
Idoso
Envelhecimento/fisiologia
Envelhecimento/psicologia
Cardiografia de Impedância
Teste de Esforço
Feminino
Seres Humanos
Masculino
Entrevista Psiquiátrica Padronizada
Testes Neuropsicológicos
Oxigênio/sangue
Córtex Pré-Frontal/irrigação sanguínea
Estudos Prospectivos
Troca Gasosa Pulmonar/fisiologia
Espectroscopia de Luz Próxima ao Infravermelho
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
S88TT14065 (Oxygen)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171017
[Lr] Data última revisão:
171017
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170923
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0183791


  2 / 1921 MEDLINE  
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[PMID]:28480853
[Au] Autor:Azaraksh A; Ivanov G; Bulanova N; Stazhadze L; Nikolaeva M; Vostrikov V
[Ad] Endereço:Russian Peoples' Friendship University, Medical Institute, Department of Hospital Therapy, Moscow; Department of Cardiology, Sechenov First Moscow State Medical University; Central State Medical Aacademy of Department of Presidential Affairs of the Russian Federation, Department of Emergency Medical
[Ti] Título:[CONTEMPORARY APPROACH TO DIAGNOSIS OF SUBCLINICAL HEART FAILURE].
[So] Source:Georgian Med News;(264):66-72, 2017 Mar.
[Is] ISSN:1512-0112
[Cp] País de publicação:Georgia (Republic)
[La] Idioma:rus
[Ab] Resumo:Treatment of congestive heart failure (CHF) remains one of the challenging problems in cardiology. In recent years, the method of multifrequency bio-impendancemetry is used in patients with CHF for the assessment of water imbalance and determination of its severity. The aim of the study was to determine the diagnostic capabilities of bio-impendancemetry in evaluation of the early manifestations of CHF. The study included 92 healthy individuals, and 335 patients who were hospitalized in the cardiology department with NYHA I-II functional class (FC) of chronic CHF. The echocardiography, rheography and biochemical examination were performed for determination of FC of CHF. Procedures were repeated at day 5 of hospitalization, 6-minute walk test was performed to assess physical tolerance and objectification of the functional status of patients with CHF. 45 patients had signs of CHF FC III-IV, therefore, they were excluded from the study. Analysis of endpoints was conducted by telephone survey in 1 year after discharge from the hospital. The results of the comparison of the predictive value of different methods for diagnosing CHF showed maximum sensitivity for brain natriuretic peptide (BNP) which was 82%, specificity was 88%. The 6-minute walk test showed the lowest values of sensitivity and specificity (sensitivity 67%, specificity 72%) as well as leg impedance at low frequencies (LF) (sensitivity 69%, specificity 74%). The values for the leg impedance at high frequencies (HF) were as follows: sensitivity 68%, specificity 97%. High predictive value of a positive result (PPV) was shown in phase angle (91%) and BNP (91%). Left ventricle ejection fraction(LVEF) measurements had the lowest PPV (72%).
[Mh] Termos MeSH primário: Insuficiência Cardíaca/diagnóstico
[Mh] Termos MeSH secundário: Adulto
Idoso
Idoso de 80 Anos ou mais
Água Corporal
Cardiografia de Impedância
Estudos de Casos e Controles
Doença Crônica
Ecocardiografia
Feminino
Insuficiência Cardíaca/diagnóstico por imagem
Insuficiência Cardíaca/fisiopatologia
Seres Humanos
Masculino
Meia-Idade
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170808
[Lr] Data última revisão:
170808
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170509
[St] Status:MEDLINE


  3 / 1921 MEDLINE  
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[PMID]:28139018
[Au] Autor:van Hedger K; Necka EA; Barakzai AK; Norman GJ
[Ad] Endereço:Department of Psychology, University of Chicago, Chicago, Illinois, USA.
[Ti] Título:The influence of social stress on time perception and psychophysiological reactivity.
[So] Source:Psychophysiology;54(5):706-712, 2017 May.
[Is] ISSN:1540-5958
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo: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. We collected psychophysiological (electrocardiogram and impedance cardiography) and time perception data before, during, and after a modified version of the Trier Social Stress Test for 42 participants. Based on prior theories and evidence from the time perception literature, we hypothesized that experiencing a stressful event would result in time distortion. This hypothesis was supported by the data, with individuals on average reproducing short and long duration negative and positive stimuli as lasting longer after experiencing social stress, t(41) = -3.55, p = .001, and t(41) = -4.12, p < .001 for negative stimuli, and t(41) = -2.43, p = .02, and t(41) = -3.07, p = .004 for positive stimuli. However, changes in time perception were largely unrelated to psychophysiological reactivity to social stress. These findings are in line with some other studies of time distortion, and provide evidence for the interoceptive salience model of time perception. Implications for mechanisms of time distortion are discussed.
[Mh] Termos MeSH primário: Comportamento Social
Estresse Psicológico/fisiopatologia
Estresse Psicológico/psicologia
Percepção do Tempo/fisiologia
[Mh] Termos MeSH secundário: Adolescente
Adulto
Sistema Nervoso Autônomo
Cardiografia de Impedância
Eletrocardiografia
Feminino
Frequência Cardíaca
Seres Humanos
Masculino
Escalas de Graduação Psiquiátrica
Psicofisiologia
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170728
[Lr] Data última revisão:
170728
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170201
[St] Status:MEDLINE
[do] DOI:10.1111/psyp.12836


  4 / 1921 MEDLINE  
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[PMID]:28095958
[Au] Autor:Ishibashi K; Oyama F; Yoshida H; Iwanaga K
[Ti] Título:Additive Effects of Sinusoidal Lower Body Negative Pressure on Cardiovascular Responses.
[So] Source:Aerosp Med Hum Perform;88(2):137-141, 2017 Feb 01.
[Is] ISSN:2375-6314
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Sinusoidal lower body negative pressure (SLBNP) has been used to investigate the cardiovascular response to slow periodic changes in blood shifts, but measurements of slow fluctuations take a long time if measured for each period of SLBNP separately. Our study aimed to investigate whether the cardiovascular responses to superimposed SLBNP (S-SLBNP), which is expected to reduce the measurement time, are different from responses measured individually. METHODS: S-SLBNP was configured by superimposing two conventional SLBNPs (C-SLBNP) at 180-s and 30-s periods in the pressure range from 0 to -25 mmHg. As the S-SLBNP has double the static load of C-SLBNP, we also used offset SLBNP (O-SLBNP), which has the same static load level as S-SLBNP. Heart rate (HR), thoracic impedance (Z0), and mean arterial pressure (MAP) were measured from 11 male subjects. The transfer functions of gains from MAP to HR (Gain-HR/MAP) and from Z0 to HR (Gain-HR/Z0) were calculated as indexes of arterial baroreflex and cardiopulmonary baroreflex regulation of HR, respectively. RESULTS: The Gain-HR/MAP in the 180-s period (2.11 ± 0.17 bpm/mmHg; mean ± SEM) was larger than that of the 30-s period (1.04 ± 0.09 bpm/mmHg); however, there was no significant difference between the SLBNP conditions. The Gain-HR/Z0 in C-SLBNP (9.37 ± 1.47 bpm/ohm) was smaller than that of the other conditions [18.46 ± 2.45 bpm/ohm (O-SLBNP); 16.09 ± 2.29 bpm/ohm (S-SLBNP)]. DISCUSSION: Using S-SLBNP could reduce the measurement time needed to examine the arterial baroreflex. However, the cardiopulmonary baroreflex was modified by the static load of SLBNP.Ishibashi K, Oyama F, Yoshida H, Iwanaga K. Additive effects of sinusoidal lower body negative pressure on cardiovascular responses. Aerosp Med Hum Perform. 2017; 88(2):137-141.
[Mh] Termos MeSH primário: Pressão Arterial
Barorreflexo
Frequência Cardíaca
Pressão Negativa da Região Corporal Inferior
[Mh] Termos MeSH secundário: Pressão Sanguínea
Cardiografia de Impedância
Voluntários Saudáveis
Seres Humanos
Masculino
Fatores de Tempo
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170309
[Lr] Data última revisão:
170309
[Sb] Subgrupo de revista:IM; S
[Da] Data de entrada para processamento:170119
[St] Status:MEDLINE
[do] DOI:10.3357/AMHP.4720.2017


  5 / 1921 MEDLINE  
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[PMID]:28095849
[Au] Autor:Cuba Gyllensten I; Crundall-Goode A; Aarts RM; Goode KM
[Ad] Endereço:Personal Health Solutions, Philips Research, p.030, High Tech Campus 34, Eindhoven, 5656AE, Netherlands. illapha@gmail.com.
[Ti] Título:Simulated case management of home telemonitoring to assess the impact of different alert algorithms on work-load and clinical decisions.
[So] Source:BMC Med Inform Decis Mak;17(1):11, 2017 Jan 17.
[Is] ISSN:1472-6947
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Home telemonitoring (HTM) of chronic heart failure (HF) promises to improve care by timely indications when a patient's condition is worsening. Simple rules of sudden weight change have been demonstrated to generate many alerts with poor sensitivity. Trend alert algorithms and bio-impedance (a more sensitive marker of fluid change), should produce fewer false alerts and reduce workload. However, comparisons between such approaches on the decisions made and the time spent reviewing alerts has not been studied. METHODS: Using HTM data from an observational trial of 91 HF patients, a simulated telemonitoring station was created and used to present virtual caseloads to clinicians experienced with HF HTM systems. Clinicians were randomised to either a simple (i.e. an increase of 2 kg in the past 3 days) or advanced alert method (either a moving average weight algorithm or bio-impedance cumulative sum algorithm). RESULTS: In total 16 clinicians reviewed the caseloads, 8 randomised to a simple alert method and 8 to the advanced alert methods. Total time to review the caseloads was lower in the advanced arms than the simple arm (80 ± 42 vs. 149 ± 82 min) but agreements on actions between clinicians were low (Fleiss kappa 0.33 and 0.31) and despite having high sensitivity many alerts in the bio-impedance arm were not considered to need further action. CONCLUSION: Advanced alerting algorithms with higher specificity are likely to reduce the time spent by clinicians and increase the percentage of time spent on changes rated as most meaningful. Work is needed to present bio-impedance alerts in a manner which is intuitive for clinicians.
[Mh] Termos MeSH primário: Cardiografia de Impedância/métodos
Administração de Caso
Tomada de Decisão Clínica/métodos
Insuficiência Cardíaca/diagnóstico
Monitorização Ambulatorial/métodos
Telemedicina/métodos
[Mh] Termos MeSH secundário: Algoritmos
Seres Humanos
Treinamento por Simulação
Fatores de Tempo
Carga de Trabalho
[Pt] Tipo de publicação:JOURNAL ARTICLE; OBSERVATIONAL STUDY; RANDOMIZED CONTROLLED TRIAL
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171013
[Lr] Data última revisão:
171013
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170119
[St] Status:MEDLINE
[do] DOI:10.1186/s12911-016-0398-9


  6 / 1921 MEDLINE  
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[PMID]:27914174
[Au] Autor:Árbol JR; Perakakis P; Garrido A; Mata JL; Fernández-Santaella MC; Vila J
[Ad] Endereço:Brain, Mind, and Behavior Research Center, University of Granada, Granada, Spain.
[Ti] Título:Mathematical detection of aortic valve opening (B point) in impedance cardiography: A comparison of three popular algorithms.
[So] Source:Psychophysiology;54(3):350-357, 2017 Mar.
[Is] ISSN:1540-5958
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The preejection period (PEP) is an index of left ventricle contractility widely used in psychophysiological research. Its computation requires detecting the moment when the aortic valve opens, which coincides with the B point in the first derivative of impedance cardiogram (ICG). Although this operation has been traditionally made via visual inspection, several algorithms based on derivative calculations have been developed to enable an automatic performance of the task. However, despite their popularity, data about their empirical validation are not always available. The present study analyzes the performance in the estimation of the aortic valve opening of three popular algorithms, by comparing their performance with the visual detection of the B point made by two independent scorers. Algorithm 1 is based on the first derivative of the ICG, Algorithm 2 on the second derivative, and Algorithm 3 on the third derivative. Algorithm 3 showed the highest accuracy rate (78.77%), followed by Algorithm 1 (24.57%) and Algorithm 2 (13.82%). In the automatic computation of PEP, Algorithm 2 resulted in significantly more missed cycles (48.57%) than Algorithm 1 (6.3%) and Algorithm 3 (3.5%). Algorithm 2 also estimated a significantly lower average PEP (70 ms), compared with the values obtained by Algorithm 1 (119 ms) and Algorithm 3 (113 ms). Our findings indicate that the algorithm based on the third derivative of the ICG performs significantly better. Nevertheless, a visual inspection of the signal proves indispensable, and this article provides a novel visual guide to facilitate the manual detection of the B point.
[Mh] Termos MeSH primário: Algoritmos
Valva Aórtica/fisiologia
Cardiografia de Impedância/métodos
[Mh] Termos MeSH secundário: Adulto
Feminino
Seres Humanos
Masculino
Reprodutibilidade dos Testes
Processamento de Sinais Assistido por Computador
Função Ventricular
Adulto Jovem
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170615
[Lr] Data última revisão:
170615
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161204
[St] Status:MEDLINE
[do] DOI:10.1111/psyp.12799


  7 / 1921 MEDLINE  
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[PMID]:27720494
[Au] Autor:Narula J; Kiran U; Malhotra Kapoor P; Choudhury M; Rajashekar P; Kumar Chowdhary U
[Ad] Endereço:Department of Cardiac Anesthesiology, Cardio-Thoracic and Neurosciences Centre, All India Institute of Medical Sciences, New Delhi, India. Electronic address: jatin.narula.13@gmail.com.
[Ti] Título:Assessment of Changes in Hemodynamics and Intrathoracic Fluid Using Electrical Cardiometry During Autologous Blood Harvest.
[So] Source:J Cardiothorac Vasc Anesth;31(1):84-89, 2017 Feb.
[Is] ISSN:1532-8422
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:OBJECTIVE: To evaluate the effect of autologous blood harvest (ABH)-induced volume shifts using electrical cardiometry (EC) in patients with pulmonary artery hypertension secondary to left heart disease. DESIGN: Prospective, randomized, controlled trial. SETTING: A tertiary care hospital. PARTICIPANTS: The study comprised 50 patients scheduled to undergo heart valve replacement. INTERVENTIONS: Patients were divided randomly into 2 experimental groups that were distinguished by whether ABH was performed. Blood volume extracted in the test group was replaced simultaneously with 1:1 colloid (Tetraspan; B Braun Melsungen, Melsungen, Germany). Hemodynamic, respiratory, and EC-derived parameters were recorded at predefined set points (T1 [post-induction/pre-ABH] and T2 [20 minutes post-ABH]). MEASUREMENTS AND MAIN RESULTS: Withdrawal of 15% of blood volume in the ABH group caused significant reductions in thoracic fluid content (TFC) (-10.1% [-15.0% to -6.1%]); right atrial pressure (-23% [-26.6% to -17.6%]); mean arterial pressure (-12.6% [-22.2% to -3.8%]); airway pressures: (peak -6.2% [-11.7% to -2.8%] and mean -15.4% [-25.0% to -8.3%]); and oxygenation index (-10.34% [-16.4% to -4.8%]). Linear regression analysis showed good correlation between the percentage change in TFC after ABH and the percentage of change in right atrial pressure, stroke volume variation, autologous blood extracted, peak and mean airway pressures, and oxygen index. CONCLUSIONS: In addition to its proven role in blood conservation, therapeutic benefits derived from ABH include decongestion of volume-loaded patients, decrease in TFC, and improved gas exchange. EC tracks beat-to-beat fluid and hemodynamic fluctuations during ABH and helps in the execution of an early patient-specific, goal-directed therapy, allowing for its safe implementation in patients with pulmonary hypertension secondary to left heart disease.
[Mh] Termos MeSH primário: Líquidos Corporais/fisiologia
Implante de Prótese de Valva Cardíaca
Recuperação de Sangue Operatório/métodos
Cavidade Torácica/fisiopatologia
[Mh] Termos MeSH secundário: Adulto
Cardiografia de Impedância/métodos
Feminino
Hemodinâmica/fisiologia
Seres Humanos
Hipertensão Pulmonar/fisiopatologia
Cuidados Intraoperatórios/métodos
Masculino
Meia-Idade
Monitorização Intraoperatória/métodos
Estudos Prospectivos
Volume Sistólico/fisiologia
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE; RANDOMIZED CONTROLLED TRIAL
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170906
[Lr] Data última revisão:
170906
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161011
[St] Status:MEDLINE


  8 / 1921 MEDLINE  
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[PMID]:27378014
[Au] Autor:Yoshitake S; Miyamoto T; Tanaka Y; Naito Y
[Ad] Endereço:Department of Cardiovascular Surgery, Gunma Children's Medical Center, Gunma, Japan.
[Ti] Título:Non-invasive measurement of cardiac output using AESCULON mini after Fontan operation.
[So] Source:Pediatr Int;59(2):141-144, 2017 Feb.
[Is] ISSN:1442-200X
[Cp] País de publicação:Australia
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Electrical velocimetry correlates well with established methods of measuring cardiac output (CO) such as thermodilution and echocardiography. In this study, we compared the cardiac function of children with single right ventricle (SRV) and single left ventricle (SLV) on non-invasive postoperative measurement of hemodynamic parameters using AESCULON mini. METHODS: Demographic, preoperative, and perioperative data were obtained from medical records. We retrospectively reviewed the AESCULON mini data of 21 patients with single ventricle who underwent Fontan operation. The patients were divided into two groups according to morphologic diagnosis: SRV (n = 9) and SLV (n = 12). The following hemodynamic parameters were analyzed: stroke volume (SV); CO; cardiac index (CI); stroke volume variation (SVV); and ventricular ejection time (VET). RESULTS: Hemodynamic parameters were as follows (SRV vs SLV): heart rate (HR), 140.5 beats/min versus 121 beats/min; SV, 14.5 mL vs 19.9 mL; CO, 2 L/min vs 2.3 L/min; CI, 4.3 L/min/m versus 4.4 L/min/m ; SVV, 15.5% versus 13.9%; and VET, 167.7 s versus 197.7 s. HR and VET were statistically different between the two groups. CONCLUSIONS: CI does not differ with laterality of the single ventricle. SRV VET, however, was significantly shorter than SLV VET in the acute postoperative period. Conversely, SRV HR was higher than SLV HR, which may mean that SRV compensates for lower VET by increasing HR.
[Mh] Termos MeSH primário: Débito Cardíaco
Cardiografia de Impedância/instrumentação
Técnica de Fontan
Cardiopatias Congênitas/cirurgia
Ventrículos do Coração/anormalidades
Monitorização Fisiológica/instrumentação
Cuidados Pós-Operatórios/instrumentação
[Mh] Termos MeSH secundário: Pré-Escolar
Cardiopatias Congênitas/fisiopatologia
Ventrículos do Coração/fisiopatologia
Ventrículos do Coração/cirurgia
Seres Humanos
Lactente
Estudos Retrospectivos
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171005
[Lr] Data última revisão:
171005
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160706
[St] Status:MEDLINE
[do] DOI:10.1111/ped.13084


  9 / 1921 MEDLINE  
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[PMID]:27337707
[Au] Autor:Buxi D; Redout JM; Yuce MR
[Ti] Título:Blood Pressure Estimation Using Pulse Transit Time From Bioimpedance and Continuous Wave Radar.
[So] Source:IEEE Trans Biomed Eng;64(4):917-927, 2017 Apr.
[Is] ISSN:1558-2531
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:OBJECTIVE: We have developed and tested a new architecture for pulse transit time (PTT) estimation at the central arteries using electrical bioimpedance, electrocardiogram, and continuous wave radar to estimate cuffless blood pressure. METHODS: A transmitter and receiver antenna are placed at the sternum to acquire the arterial pulsation at the aortic arch. A four-electrode arrangement across the shoulders acquires arterial pulse across the carotid and subclavian arteries from bioimpedance as well as a bipolar lead I electrocardiogram. The PTT and pulse arrival times (PATs) are measured on six healthy male subjects during exercise on a bicycle ergometer. Using linear regression, the estimated PAT and PTT values are calibrated to the systolic and mean as well as diastolic blood pressure from an oscillometric device. RESULTS: For all subjects, the Pearson correlation coefficients for PAT-SBP and PTT-SBP are -0.66 (p = 0.001) and -0.48 (p = 0.0029), respectively. Correlation coefficients for individual subjects ranged from -0.54 to -0.9 and -0.37 to -0.95, respectively. CONCLUSION: The proposed system architecture is promising in estimating cuffless arterial blood pressure at the central, proximal arteries, which obey the Moens-Korteweg equation more closely when compared to peripheral arteries. SIGNIFICANCE: An important advantage of PTT from the carotid and subclavian arteries is that the PTT over the central elastic arteries is measured instead of the peripheral arteries, which potentially reduces the changes in PTT due to vasomotion. Furthermore, the sensors can be completely hidden under a patients clothes, making them more acceptable by the patient for ambulatory monitoring.
[Mh] Termos MeSH primário: Determinação da Pressão Arterial/instrumentação
Pressão Sanguínea/fisiologia
Cardiografia de Impedância/instrumentação
Diagnóstico por Computador/métodos
Análise de Onda de Pulso/métodos
Radar
[Mh] Termos MeSH secundário: Algoritmos
Determinação da Pressão Arterial/métodos
Cardiografia de Impedância/métodos
Diagnóstico por Computador/instrumentação
Eletrodos
Desenho de Equipamento
Análise de Falha de Equipamento
Seres Humanos
Masculino
Micro-Ondas
Reprodutibilidade dos Testes
Sensibilidade e Especificidade
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170713
[Lr] Data última revisão:
170713
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160624
[St] Status:MEDLINE
[do] DOI:10.1109/TBME.2016.2582472


  10 / 1921 MEDLINE  
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[PMID]:27283342
[Au] Autor:Spartano NL; Heffernan KS; Dumas AK; Gump BB
[Ad] Endereço:Section of Preventative Medicine and Epidemiology, Boston University School of Medicine, Boston, MA, United States; The Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA, United States. Electronic address: Spartano@bu.edu.
[Ti] Título:Accelerometer-determined physical activity and the cardiovascular response to mental stress in children.
[So] Source:J Sci Med Sport;20(1):60-65, 2017 Jan.
[Is] ISSN:1878-1861
[Cp] País de publicação:Australia
[La] Idioma:eng
[Ab] Resumo:OBJECTIVES: Cardiovascular reactivity has been associated with future hypertension and cardiovascular mortality. Higher physical activity (PA) has been associated with lower cardiovascular reactivity in adults, but little data is available in children. The purpose of this study was to examine the relationship between PA and cardiovascular reactivity to mental stress in children. DESIGN: Cross-sectional study. METHODS: This study sample included children from the Oswego Lead Study (n=79, 46% female, 9-11 years old). Impedance cardiography was performed while children participated in a stress response protocol. Children were also asked to wear Actigraph accelerometers on their wrists for 3 days to measure intensity and duration of PA and sedentary time. RESULTS: In multivariable models, moderate to vigorous (MV) PA was associated with lower body mass index (BMI) percentile and lower total peripheral resistance (TPR) response to stress (beta=-0.025, p=0.02; beta=-0.009, p=0.05). After additional adjustment for BMI, MVPA was also associated with lower diastolic blood pressure response to stress (beta=-0.01, p=0.03). Total PA and sedentary time were not associated with BMI or cardiovascular responses to stress. CONCLUSIONS: A modest, inverse relation of PA to vascular reactivity to mental stress was observed in children. These data provide confirmatory evidence that the promotion of PA recommendations for children are important for cardiovascular health.
[Mh] Termos MeSH primário: Acelerometria/métodos
Exercício
Frequência Cardíaca/fisiologia
Estresse Fisiológico/fisiologia
Resistência Vascular/fisiologia
[Mh] Termos MeSH secundário: Pressão Sanguínea/fisiologia
Índice de Massa Corporal
Cardiografia de Impedância/métodos
Criança
Estudos Transversais
Feminino
Seres Humanos
Masculino
Análise Multivariada
Estilo de Vida Sedentário
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170616
[Lr] Data última revisão:
170616
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160611
[St] Status:MEDLINE



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