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1.
Niger J Clin Pract ; 22(10): 1349-1355, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31607723

RESUMO

Objective: The objective of the this study is to document the existence of statistically significant differences between parameters of heart rate variability (HRV) and heart rate turbulence (HRT), determined in women with overt hyperthyroidism (hT), compared to controls and to highlight their correlations with the level of thyroid hormones and the incidence of arrhythmias. Methods: We studied the HRV in time and frequency domain, and the HRT in a group of 113 women with overt hT, without other cardiovascular risk factors or comorbidities, admitted to the endocrinology clinic of our hospital, between 2012 and 2016. Depending on the severity and duration of hT and levels of thyroid hormones, the patients were assigned to three groups: mild and moderate forms, severe hT with thyrotoxicosis and persistent cases with a relapse of hT. We performed 24 h Holter monitoring in all patients. Results: HRV parameters in time domain (TD) were significantly depressed in patients comparing to controls. All patients had abnormal, positive values of turbulence onset (TO) with significant statistically differences (P < 0.0001) comparing to controls. Although positive, the values of turbulence slope (TS) decreased according to the severity of hT. Conclusion: Patients with hT had depressed values of HRV parameters in TD, correlated with the severity of the thyroid disease and with the incidence of arrhythmias. All patients presented pathological values of TO. TS values were positive, but lower compared to controls.


Assuntos
Arritmias Cardíacas/diagnóstico , Eletrocardiografia Ambulatorial/métodos , Frequência Cardíaca/fisiologia , Hipertireoidismo/complicações , Hormônios Tireóideos/sangue , Adulto , Arritmias Cardíacas/epidemiologia , Estudos de Casos e Controles , Doença Crônica , Comorbidade , Feminino , Humanos , Hipertireoidismo/epidemiologia , Masculino , Pessoa de Meia-Idade , Índice de Gravidade de Doença
2.
Undersea Hyperb Med ; 46(4): 421-427, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31509898

RESUMO

Introduction: About 26% of diving-related fatalities are caused by cardiac disease, part of which might be associated with fatal arrhythmias. This raises the question as to whether fatal arrhythmias are being provoked by hyperbaric conditions themselves or if exercise or stress provokes the fatal arrhythmias in cases of underlying (ischemic) cardiac disease. Objective: To measure the influence of hyperbaric conditions (50 msw) on cardiac conduction and arrhythmias in professional divers by means of ECG. Methods: This is a prospective study on military divers in a hyperbaric chamber with continuous ECG monitoring using Holter registrations. Supraventricular and ventricular ectopy was registered during hyperbaric conditions. RR, PR, QRS, QT and QTc intervals were calculated at 50 msw and compared with ECGs at rest. Results: Included were 17 male military divers who made 20 dives. A total of 10 PVCs, 45 PACs, four atrial runs and four atrial pairs were seen. Significant prolongation of the PR interval was seen and a decrease of in QRS duration at 50 msw. There was no significant change in the RR, QT and QTc intervals. Conclusion: In these divers, no clinically relevant arrhythmias were observed during wet dives in a recompression chamber at 50 msw. We observed a small prolongation of PR interval that is probably not clinically relevant in divers without any known conduction disorders.


Assuntos
Arritmias Cardíacas/diagnóstico , Mergulho/efeitos adversos , Pressão/efeitos adversos , Adulto , Arritmias Cardíacas/etiologia , Arritmias Cardíacas/fisiopatologia , Descompressão , Mergulho/fisiologia , Eletrocardiografia Ambulatorial/instrumentação , Eletrocardiografia Ambulatorial/métodos , Sistema de Condução Cardíaco/fisiopatologia , Humanos , Masculino , Pessoa de Meia-Idade , Militares , Estudos Prospectivos , Água do Mar , Taquicardia Supraventricular/diagnóstico , Taquicardia Supraventricular/etiologia , Taquicardia Supraventricular/fisiopatologia , Fatores de Tempo , Complexos Ventriculares Prematuros/diagnóstico , Complexos Ventriculares Prematuros/etiologia , Complexos Ventriculares Prematuros/fisiopatologia
3.
Neurology ; 93(10): 450-458, 2019 09 03.
Artigo em Inglês | MEDLINE | ID: mdl-31477610

RESUMO

OBJECTIVE: We hypothesized that cardiac electrical instability and abnormal autonomic tone result from cumulative cardiac injury sustained in recurrent seizures. We tested this hypothesis by comparing T-wave alternans (TWA) and heart rate variability (HRV), both established markers of sudden cardiac death (SCD) risk, in patients with chronic as compared to newly diagnosed epilepsy. METHODS: In this prospective, observational cohort study, patients (newly diagnosed epilepsy, n = 6, age 41.8 ± 6.8 years; chronic epilepsy, n = 6, age 40.2 ± 5.6 years [p = 0.85]) were monitored either with Holter recorder alone or simultaneously with 14-day Zio XT extended continuous ECG patch monitor. TWA was assessed by Food and Drug Administration-cleared Modified Moving Average analysis; HRV was calculated by rMSSD. RESULTS: TWA levels in chronic epilepsy were significantly higher than in newly diagnosed epilepsy (62 ± 5.4 vs 35 ± 1.3 µV, p < 0.002); the latter did not differ from healthy control adults. In all patients with chronic epilepsy, TWA exceeded the established ≥47-µV TWA cutpoint and rMSSD HRV was inversely related to TWA levels. Patients with chronic epilepsy exhibited elevated TWA levels equivalently on Holter and ECG patch recordings (p = 0.38) with a high correlation (r 2 = 0.99, p < 0.01) across 24 hours. CONCLUSION: Based on the limited number of patients studied, it appears that chronic epilepsy, the common use of sodium channel antagonists, or other factors are associated with higher TWA levels and simultaneously with lower rMSSD HRV, which is suggestive of autonomic dysfunction or higher sympathetic tone. The ECG patch monitor used has equivalent accuracy to Holter monitoring for TWA and HRV and permits longer-term ECG sampling.


Assuntos
Eletrocardiografia Ambulatorial/métodos , Epilepsia/diagnóstico , Epilepsia/fisiopatologia , Frequência Cardíaca/fisiologia , Adulto , Doença Crônica , Estudos de Coortes , Eletrocardiografia/instrumentação , Eletrocardiografia/métodos , Eletrocardiografia Ambulatorial/instrumentação , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Monitorização Ambulatorial/instrumentação , Monitorização Ambulatorial/métodos , Estudos Prospectivos
4.
Int J Med Inform ; 130: 103928, 2019 10.
Artigo em Inglês | MEDLINE | ID: mdl-31434042

RESUMO

BACKGROUND: Health monitoring is shifting towards continuous, ambulatory and clinically comparable wearable devices. Telemedicine and remote diagnosis could harness the capability of mobile cardiac health information, as the technology on bio-physical signal monitoring has improved significantly. OBJECTIVES: The purpose of this review article is (1) to systematically assess the viability of ambulatory electrocardiography (ECG), (2) to provide a systems level understanding of a broad spectrum of wearable heart signal monitoring approaches and (3) to identify areas of improvement in the existing technology needed to attain clinical grade diagnosis. RESULTS: Based on the included literature, we have identified (1) that the developments in ECG monitoring through wearable devices are reaching feasibility, and are capable of delivering diagnostic and prognostic information, (2) that reliable sensing is the major bottleneck in the entire process of ambulatory monitoring, (3) that there is a strong need for artificial intelligence and machine learning techniques to parse and infer the biosignals and (4) that aspects of wearer comfort has largely been ignored in the prevailing developments, which can become a key factor for consumer acceptance. CONCLUSIONS: Cardiac health information is crucial for diagnosis and prevention of several disease onsets. Mobile and continuous monitoring can aid avoiding risks involved with acute symptoms. The health information obtained through continuous monitoring can serve as the BigData of heart signals, and can facilitate new treatment methods and devise effective health policies.


Assuntos
Eletrocardiografia Ambulatorial/métodos , Monitorização Ambulatorial/métodos , Telemedicina/métodos , Dispositivos Eletrônicos Vestíveis/estatística & dados numéricos , Arritmias Cardíacas/fisiopatologia , Eletrocardiografia Ambulatorial/instrumentação , Humanos , Monitorização Ambulatorial/instrumentação
5.
Mayo Clin Proc ; 94(9): 1695-1706, 2019 09.
Artigo em Inglês | MEDLINE | ID: mdl-31402054

RESUMO

OBJECTIVE: To assess the efficacy and safety of catheter-based renal denervation (RDN) for the treatment of uncontrolled hypertension by conducting a systematic review and a meta-analysis. METHODS: The Medline, Cochrane Library, and Embase databases were searched for clinical studies between January 1, 2009, and July 16, 2018. Studies that evaluated the effect of RDN on uncontrolled hypertension were identified. The primary endpoints were changes in 24-hour ambulatory systolic blood pressure (BP) and office systolic BP. The secondary endpoints included changes in 24-hour ambulatory diastolic BP, office diastolic BP, and major adverse events. RESULTS: After a literature search and detailed evaluation, 12 randomized controlled trials with a total of 1539 individuals were included in the quantitative analysis. Pooled analyses indicated that RDN was associated with a significantly greater reduction of 24-hour systolic BP (mean difference [MD], -4.02 mm Hg; 95% CI, -5.49 to -2.56; P<.001) and office systolic BP (MD, -8.93 mm Hg; 95% CI, -14.03 to -3.83; P<.001) than controls. Similarly, RDN significantly reduced 24-hour diastolic BP (MD, -2.05 mm Hg; 95% CI, -3.05 to -1.05; P<.001) and office diastolic BP (MD, -4.49 mm Hg; 95% CI, -6.46 to -2.52; P<.001). RDN was not associated with an increased risk of major adverse events (relative risk, 1.06; 95% CI, 0.72 to 1.57; P=.76). CONCLUSIONS: Catheter-based RDN was associated with a significant BP-lowering benefit without increasing major adverse events.


Assuntos
Denervação Autônoma/métodos , Ablação por Cateter/métodos , Hipertensão/diagnóstico , Hipertensão/cirurgia , Rim/cirurgia , Adulto , Idoso , Eletrocardiografia Ambulatorial/métodos , Feminino , Humanos , Rim/inervação , Masculino , Pessoa de Meia-Idade , Procedimentos Cirúrgicos Minimamente Invasivos/métodos , Ensaios Clínicos Controlados Aleatórios como Assunto , Índice de Gravidade de Doença , Resultado do Tratamento
6.
Zhongguo Yi Liao Qi Xie Za Zhi ; 43(4): 252-254, 2019 Jul 30.
Artigo em Chinês | MEDLINE | ID: mdl-31460714

RESUMO

The amplifier is easy to saturation because of polarization voltage in ambulatory ECG acquisition. The traditional way is using analog high-pass filter to eliminate, but the output tends to have a residue. If upgrading high-pass filter cutoff frequency, it will lead to low frequency distortion of ECG signals. In this paper, a Savitzky-Golay (SG) smoothing filter has been designed by combining the single edge point M and the polynomial order p, which can fit the polarization voltage components of ECG signals, filter useful components and get drift-free ECG signals by using the subtraction algorithm. The results of ECG filtering experiment verify the feasibility of the SG smoothing filter, and show the filtered ECG signal without any losses of useful components.


Assuntos
Eletrocardiografia Ambulatorial , Processamento de Sinais Assistido por Computador , Algoritmos , Amplificadores Eletrônicos , Eletrocardiografia Ambulatorial/métodos , Humanos
7.
Cleve Clin J Med ; 86(7): 483-493, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31291182

RESUMO

Ambulatory electrocardiography (ECG) allows for extended monitoring of arrhythmias in a real-world setting. This article reviews the currently available ambulatory ECG devices and their differences in design, function, indications, efficacy, cost, and optimal use in clinical practice.


Assuntos
Arritmias Cardíacas/diagnóstico , Eletrocardiografia Ambulatorial/instrumentação , Smartphone , Dispositivos Eletrônicos Vestíveis , Eletrocardiografia Ambulatorial/métodos , Humanos
8.
Res Vet Sci ; 125: 253-255, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31325639

RESUMO

Normal Holter reference intervals have not been established for dogs <1 year of age. This lack of Holter reference intervals inhibits the ability to screen puppies for early indicators of heart disease, especially in breeds that have inherited cardiac arrhythmias (e.g. German Shepherd Dogs) or a high incidence of arrhythmic heart disease (e.g. Boxer dogs). The objective of this project was to establish Holter minimum, average, and maximum heart rates and incidence of arrhythmias in clinically healthy dogs <1 year of age and to compare these results to previously reported Holter data for their adult counterparts. Forty-four client-owned clinically healthy puppies between 12 and 51 weeks of age were prospectively studied. Age was determined by date of birth and corroborated by dental examination. Puppies were deemed healthy based on history and physical examination. Puppies with heart murmurs underwent echocardiographic examination. Dogs with physiologic heart murmurs were included. Twenty-four hour ECG recordings were obtained using a digital Holter system. The median (interquartile range) Holter minimum, average, and maximum heart rates were 51 bpm (43-60 bpm), 99 bpm (85-113 bpm), and 274 bpm (257-291 bpm), respectively. The median for ventricular and supraventricular arrhythmias was 0. Ventricular and supraventricular premature complexes were identified in 4/44 (9%) and 6/44 (13%) puppies, respectively. Second degree atrioventricular block was identified in 2/44 puppies (5%). Overall, minimum, average, and maximum Holter heart rates of puppies are higher than adult dogs. The incidence of ventricular and supraventricular premature complexes in puppies is similar to adult dogs.


Assuntos
Eletrocardiografia Ambulatorial/veterinária , Animais , Cães , Eletrocardiografia Ambulatorial/instrumentação , Eletrocardiografia Ambulatorial/métodos , Feminino , Masculino , Valores de Referência
9.
Orv Hetil ; 160(29): 1143-1145, 2019 Jul.
Artigo em Húngaro | MEDLINE | ID: mdl-31303014

RESUMO

A 52-year-old woman is presented with repetitive transient loss of consciousness. Implantable loop recorder (ILR) recorded muscle artifacts during the generalized tonic-clonic seizures. Seizure was diagnosed and antiepileptic drug was started. The patient has been asymptomatic for 9 months. Orv Hetil. 2019; 160(29): 1143-1145.


Assuntos
Eletrocardiografia Ambulatorial/métodos , Epilepsia Tônico-Clônica/diagnóstico , Próteses e Implantes , Convulsões/diagnóstico , Síncope/etiologia , Anticonvulsivantes , Eletrocardiografia , Feminino , Humanos , Pessoa de Meia-Idade , Convulsões/complicações
10.
Medicina (Kaunas) ; 55(6)2019 Jun 03.
Artigo em Inglês | MEDLINE | ID: mdl-31163695

RESUMO

Background: Association of premature ventricular complexes (PVC) with left ventricular systolic dysfunction (LVSD) and efficacy of catheter ablation treatment have been demonstrated in studies. The role of left atrial (LA) mechanics in the etiopathogenesis of PVC-induced cardiomyopathy (PVC-CMP) as well as changes in LA mechanics with catheter ablation have not been studied before. Methods: A total number of 61 patients (Mean Age 43 ± 3) with idiopathic outflow tract (OT) PVCs undergoing radiofrequency catheter ablation (RFCA) were enrolled. ECG, 24 h Holter, and echocardiographic evaluation with left ventricular (LV) diastolic functions and LA volumetric assessments were performed before and three months after RFCA. Results: Along with a marginal increase in left ventricle ejection fraction (LVEF), improvement in diastolic functions and left atrial mechanics were observed in the study (LVEF 53 ± 7 versus 57 ± 6, p < 0.01) in short-term follow-up. The frequency of LV diastolic dysfunction (LVDD) decreased with catheter ablation (n = 5 to 0, p = 0.02). The overall LA function improved. Left atrium passive and overall emptying fraction (LAEF) increased significantly (0.32 ± 0.04 to 0.41 ± 0.04, p < 0.05 and 0.62 ± 0.04 to 0.65 ± 0.004, p < 0.05, respectively). Active LAEF decreased significantly (0.29 ± 0.005 to 0.24 ± 0.006, p < 0.05). Conclusions: The results of this study are indicative of "PVC-induced atriomyopathy" which responds to RFCA in short-term follow-up. Atrial dysfunction might play a role in symptoms and etiopathogenesis of LVSD.


Assuntos
Função do Átrio Esquerdo/fisiologia , Ablação por Cateter/normas , Adulto , Análise de Variância , Ablação por Cateter/métodos , Ecocardiografia/métodos , Eletrocardiografia/métodos , Eletrocardiografia Ambulatorial/métodos , Feminino , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Resultado do Tratamento , Complexos Ventriculares Prematuros/complicações , Complexos Ventriculares Prematuros/fisiopatologia
11.
Heart Vessels ; 34(11): 1801-1810, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31111194

RESUMO

Heart rate turbulence (HRT) is regarded as a parameter of cardiac autonomic dysfunction. Several studies have suggested that patients with sleep disordered breathing (SDB) have an impaired HRT, which play a role in the relationship between SDB and risk of cardiovascular morbidity and mortality. However, the impact of SDB on HRT independent from obesity is still debatable. Data of eligible subjects who underwent sleep test and 24 h Holter electrocardiogram (ECG) recording from 2009-2012 were analyzed. HRT parameters, turbulence onset (TO), and turbulence slope (TS) in the 24 h recording, while awakening, and sleeping (TO-24 h, TO-awake, TO-sleep, TS-24 h, TS-awake, and TS-sleep, respectively) were compared across subjects with no-to-mild, moderate, and severe SDB. Univariable and multivariable regression analyses including TO or TS as a dependent variable were performed. Data from 41 subjects were evaluated. Compared with the no-to-mild and moderate SDB groups, in the severe SDB group, the TO-24 h and TO-awake were significantly greater, and the TS-24 h, TS-awake, and TS-sleep were significantly lower. In multivariable analyses, the apnea-hypopnea index (AHI) was correlated directly with TO-24 h (coefficient, 0.36; P = 0.03) and TO-awake (coefficient, 0.40; P = 0.01). SDB severity, as represented by AHI, is related to HRT impairments in non-obese subjects. SDB, independent from obesity, may affect cardiac autonomic dysfunction.


Assuntos
Sistema Nervoso Autônomo/fisiopatologia , Eletrocardiografia Ambulatorial/métodos , Cardiopatias/fisiopatologia , Frequência Cardíaca/fisiologia , Síndromes da Apneia do Sono/fisiopatologia , Sono/fisiologia , Idoso , Feminino , Seguimentos , Cardiopatias/etiologia , Humanos , Masculino , Pessoa de Meia-Idade , Obesidade , Polissonografia , Prognóstico , Estudos Retrospectivos , Síndromes da Apneia do Sono/complicações
12.
PLoS One ; 14(5): e0216530, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31071137

RESUMO

BACKGROUND: The cardiac diagnostic workup of stroke patients, especially the value of echocardiography and enhanced and prolonged Holter-ECG monitoring, is still a matter of debate. We aimed to analyse the impact of pathologies detected by echocardiography and ECG monitoring on therapeutic decisions and prognosis. METHODS: Find-AFRANDOMISED was a prospective multicenter study which randomised 398 acute ischemic stroke patients ≥ 60 years to enhanced and prolonged Holter-ECG monitoring or usual stroke unit care. This substudy compared therapeutic consequences of echocardiography and routine Holter-ECG or enhanced and prolonged Holter-ECG monitoring, respectively, and prognosis of patients with or without pathologic findings in echocardiography or Holter-ECG monitoring. RESULTS: 50.3% received enhanced and prolonged Holter-ECG monitoring and 49.7% routine ECG monitoring. 82.9% underwent transthoracic echocardiography (TTE), 38.9% transesophageal echocardiography (TEE) and 25.6% both procedures. 14/89 TEE pathologies and 1/90 TTE pathology led to a change in therapy, resulting in a number needed to change decision (NNCD) of 12 and 330 (p < 0.001), respectively. In comparison, enhanced and prolonged Holter-ECG monitoring found atrial fibrillation (AF) in 27 of 200 patients, and routine ECG monitoring in twelve of 198 patients, leading to therapeutic changes in all patients (NNCD 8 and 17, respectively, p < 0.001). CONCLUSIONS: Most changes in therapeutic decisions were triggered by enhanced and prolonged Holter-ECG monitoring, which should therefore play a more prominent role in future guidelines. Echocardiography identifies a patient group at high cardiovascular risk, but rarely result in therapeutic changes. Whether this patient group requires further cardiovascular workup remains unknown. This should be further investigated by interdisciplinary neurocardiologic teams and in appropriate future trials. TRIAL REGISTRATION: ClinicalTrials.gov NCT01855035.


Assuntos
Fibrilação Atrial/diagnóstico , Eletrocardiografia Ambulatorial/métodos , Coração/fisiopatologia , Acidente Vascular Cerebral/complicações , Idoso , Fibrilação Atrial/etiologia , Eletrocardiografia , Feminino , Humanos , Masculino , Prognóstico , Estudos Prospectivos , Acidente Vascular Cerebral/fisiopatologia , Fatores de Tempo
14.
J Med Syst ; 43(6): 160, 2019 Apr 26.
Artigo em Inglês | MEDLINE | ID: mdl-31028488

RESUMO

With the approaching of the aging of the population in China, the risk of heart disease increases with age. Atrial fibrillation as a common heart disease has seriously affected people's lives and health. A study of atrial fibrillation, dynamic electrocardiogram is usually used to analyze atrial fibrillation. But the accuracy of this analytical method may be artificially disturbed, which causes errors in the process of data analysis. Therefore, the computation analysis is carried by combining the automatic detection algorithm. By using the calculation of computer algorithm, the accuracy of data analysis of dynamic electrocardiogram can be increased. And through the test of automatic detection algorithm, the effectiveness of the algorithm can be found.


Assuntos
Fibrilação Atrial/fisiopatologia , Eletrocardiografia Ambulatorial/métodos , Processamento de Sinais Assistido por Computador , Algoritmos , Humanos
15.
Pediatr Cardiol ; 40(5): 921-924, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-30937502

RESUMO

Ambulatory electrocardiogram monitoring devices can be used for 24-72 h to detect arrhythmias. A new device, the ZIO® XT Patch has cardiac monitoring capabilities that can be utilized for up to 14 days. The purpose of this study is to describe duration of ZIO use by age, and to compare its time to arrhythmia detection with the Holter monitor in a pediatric population. A single-center, retrospective review of patients < 18 years of age who underwent clinical investigation with ZIO from October 2014 to February 2016 was performed. An age-matched cohort was utilized to compare ZIO to Holter monitor results. Demographic and diagnostic data, time to first arrhythmia, and arrhythmia burden were analyzed. A total of 406 ZIO were prescribed; median age 12.7 years and 50% male subjects. Median duration of ZIO monitoring significantly increased with age (p < 0.001). 499 Holter monitors were prescribed on a statistically different age group. Arrhythmia detection rates were similar between groups, 10% (n = 42) by ZIO and 9% (n = 45) by Holter (p = NS). The majority of arrhythmias (57%) detected by ZIO were after 24 h (p < 0.0001). All arrhythmias detected by Holter monitor occurred within 24 h (p < 0.0001), mean duration of wear was 24.1 h, range 0.5-48 h. The ZIO® XT Patch may be considered as an ambulatory ECG monitor to diagnose arrhythmia in pediatric patients of all ages. Increasing patient age resulted in increasing duration of ZIO monitoring. Majority of arrhythmias detected with ZIO were identified after 24 h, which would have been missed by other short-term monitors.


Assuntos
Arritmias Cardíacas/diagnóstico , Eletrocardiografia Ambulatorial/métodos , Adolescente , Criança , Feminino , Humanos , Masculino , Valor Preditivo dos Testes , Estudos Retrospectivos , Fatores de Tempo
16.
Eur J Appl Physiol ; 119(7): 1525-1532, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31004219

RESUMO

This study was designed to examine the RR interval signal qualities of a Holter device and a heart rate chest belt monitor at rest and during exercise. Ten healthy individuals completed five low- to high-intensity activities while simultaneously using the medilog® AR12plus Holter monitor and the Polar H10 heart rate monitor. The RR interval signal quality was based on the quantification of the missing RR intervals and RR interval detection errors. Therefore, both measurement systems were compared against visual inspection of the raw electrocardiography signal. The missing and wrong R-wave peak detections were counted manually for both measurement systems. RR interval signal quality was defined as the relative number of correctly detected RR intervals. Overall, RR interval signal qualities of 94.6% and 99.6% were demonstrated for the medilog® AR12plus and the Polar H10. During the high-intensity activities, the RR interval signal quality of the medilog® AR12plus dropped to 89.8%, whereas the Polar H10 maintained a signal quality of 99.4%. The correlation between both systems was high (r = 0.997, p > 0.001). The excellent RR interval signal quality during low- to moderate-intensity activities in the medilog® AR12plus and during low- to high-intensity activities in the Polar H10 demonstrates both measurement systems' validity for the detection of RR intervals throughout a wide range of activities. A simple chest strap such as the Polar H10 might be recommended as the gold standard for RR interval assessments if intense activities with strong body movements are investigated.


Assuntos
Eletrocardiografia Ambulatorial/métodos , Exercício/fisiologia , Frequência Cardíaca , Adulto , Eletrocardiografia Ambulatorial/instrumentação , Eletrocardiografia Ambulatorial/normas , Feminino , Humanos , Masculino , Padrões de Referência , Reprodutibilidade dos Testes
17.
Rev. chil. cardiol ; 38(1): 20-28, abr. 2019. ilus, tab
Artigo em Espanhol | LILACS | ID: biblio-1003634

RESUMO

Resumen Introducción: Previamente se desarrolló una nueva metodología de ayuda diagnóstica para los registros Holter fundamentada en los sistemas dinámicos y la teoría de probabilidad, a partir de la información registrada en 21 horas. Objetivo: Evaluar la capacidad diagnóstica de esta metodología durante 19 horas, comparándola con los resultados convencionales del Holter y con los resultados del método matemático aplicado en 21 horas. Materiales y Métodos: fueron evaluados 80 casos de pacientes mayores a 20 años, 10 con registro Holter normal y 70 diagnosticados de forma convencional con diferentes patologías cardíacas. Se establecieron los rangos para las frecuencias cardíacas y de número de latidos por hora en 21 y 19 horas; luego, se calculó la probabilidad de ocurrencia de estos, lo que permitió diferenciar estados de normalidad y enfermedad aguda a partir de tres parámetros. Se comparó el diagnóstico físico-matemático con el diagnóstico convencional, tomado como Gold Standard. Resultados: De los casos normales, dos presentaron probabilidad menor o igual a 0,217 y ocho probabilidades mayores o igual a 0,304; ningún caso de enfermedad aguda presentó valores con probabilidad menor o igual a 0,217, mientras que todos presentaron valores mayores o iguales a 0,304, tanto para los registros Holter evaluados en 21 como en 19 horas. Conclusiones: Se confirmó la utilidad clínica de la metodología ante una reducción del tiempo de evaluación a 19 horas, obteniendo diagnósticos objetivos con base en la auto-organización matemática del fenómeno.


Abstract Background: a new method to help evaluate 21-hour holter recordings based on dynamic systems and the theory of probability was previously developed Aim: to evaluate the diagnostic value of this methodology in the analysis of 19 hr compared to conventional holter analysis over a 21-hr recording. Methods: the holter recordings of 80 subjects aged over 20 years old were analyzed. Ten subjects had a normal holter and 70 conventionally diagnosed as abnormal. Ranges for heart rate and number of beats in 21 or 19 hours were determined. The probability of their occurrence was calculated using 3 parameters. The mathematically derived diagnosis was compared to the clinical diagnosis, considered a gold standard. Results: Among normal cases the calculated probability was ≤ 0.217 in 2 cases and ≥0.304 in 8. No case with acute disease presented probability values ≤0.217; all had probability values ≥0.304, both in 21 and 19 hour recordings. Conclusion: the mathematical methodology described was clinically useful allowing a reduction in recording time from 21 to 19 hr. Clinical diagnosis may be inferred from the mathematical organization of a holter recording.


Assuntos
Humanos , Masculino , Feminino , Adulto , Doenças Cardiovasculares/diagnóstico , Eletrocardiografia Ambulatorial/métodos , Arritmias Cardíacas/diagnóstico , Fatores de Tempo , Doenças Cardiovasculares/fisiopatologia , Probabilidade , Frequência Cardíaca/fisiologia
18.
Intern Med ; 58(14): 2041-2044, 2019 Jul 15.
Artigo em Inglês | MEDLINE | ID: mdl-30918200

RESUMO

An 84-year-old man presented with syncope. Prior to admission, ambulatory electrocardiogram had demonstrated non-sustained ventricular tachycardia. Echocardiography showed severe aortic stenosis. He was also diagnosed with hypertrophic cardiomyopathy (HCM) by cardiac magnetic resonance (CMR) showing remarkable inhomogeneous left ventricular hypertrophy and extensive late gadolinium enhancement (LGE) in the lesions at the upper border and right-ventricular side of the basal-mid septal wall. Finally, he showed complete atrioventricular (AV) block followed by a long pause and syncope several times after admission. In this case with several possible causes of syncope, the CMR findings suggested a clue concerning the etiology of his syncope: complete AV block in HCM.


Assuntos
Bloqueio Atrioventricular/complicações , Cardiomiopatia Hipertrófica/diagnóstico por imagem , Fibrose/diagnóstico por imagem , Hipertrofia Ventricular Esquerda/complicações , Imagem Cinética por Ressonância Magnética/métodos , Marca-Passo Artificial , Síncope/complicações , Idoso de 80 Anos ou mais , Estenose da Valva Aórtica , Bloqueio Atrioventricular/cirurgia , Meios de Contraste , Eletrocardiografia Ambulatorial/métodos , Fibrose/cirurgia , Gadolínio DTPA , Ventrículos do Coração/fisiopatologia , Humanos , Hipertrofia Ventricular Esquerda/cirurgia , Masculino , Miocárdio/patologia , Síncope/cirurgia , Resultado do Tratamento
20.
Int J Cardiol ; 286: 137-142, 2019 07 01.
Artigo em Inglês | MEDLINE | ID: mdl-30904280

RESUMO

BACKGROUND: This study assessed the acute effect of 21 days of challenging exercise on heart structure and function in recreationally active people across a range of age categories. METHODS: 15 recreationally active people completed a 21-day fundraising cycling ride (MADRIDE) over a distance of 3515 km. Twenty-four hour Holter electrocardiography and blood biochemistry analyses were performed before and after the MADRIDE. RESULTS: Incidence of cardiac arrhythmia was higher after MADRIDE (OR: 5.93; 95% CI: 5.68-6.19), with increases in both ventricular arrhythmias (OR: 9.90; 95% CI: 9.27-10.57) and supraventricular arrhythmias (OR: 3.09; 95% CI: 2.91-3.29). Adults (OR: 11.45; 95% CI: 7.41-17.69) and older adults (OR: 10.42 95% CI 9.83-11.05) were approximately 10 times more likely to experience arrhythmias after the MADRIDE. Whereas, young participants experienced 18% less cardiac arrhythmias after MADRIDE (OR: 0.82; 95% CI: 0.75-0.90). Aortic valve max velocity was reduced (MD: -0.12 m/s; 95% CI: -0.19-0.05 m/s) and mitral valve deceleration time was slower (MD: -28.91 m/s; 95% CI: -50.97-6.84 m/s) after MADRIDE. Other structural and functional characteristics along with heart rate variability were not different after MADRIDE. CONCLUSIONS: Multi-day challenging exercise increased the incidence of both supraventricular and ventricular arrhythmias in active adults and older adults. Increases in arrhythmia rates after MADRIDE occurred without changes in cardiac structure and autonomic control. Further exploration is necessary to identify the causes of exercise-induced cardiac arrhythmia in adult and older adults.


Assuntos
Arritmias Cardíacas/epidemiologia , Ciclismo/fisiologia , Eletrocardiografia Ambulatorial/métodos , Metabolismo Energético/fisiologia , Tolerância ao Exercício/fisiologia , Frequência Cardíaca/fisiologia , Adolescente , Adulto , Arritmias Cardíacas/diagnóstico , Arritmias Cardíacas/fisiopatologia , Austrália/epidemiologia , Ecocardiografia , Feminino , Seguimentos , Humanos , Incidência , Masculino , Valores de Referência , Fatores de Risco , Fatores de Tempo , Adulto Jovem
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