Avaliação da função autonômica na cardiomiopatia hipertrófica

Bittencourt, Marcelo Imbroinise; Benchimol-Barbosa, Paulo Roberto; Neto, C. Costa; Bedirian, Ricardo; Barbosa, Eduardo Corrêa; Brasil, Flavia; Bomfim, Alfredo de Souza; Filho, Francisco Manes Albanesi

doi:10.1590/s0066-782x2005001900004

Cited by 11 publications

(12 citation statements)

References 29 publications

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“…The statistical indexes in the time domain, obtained by the determination of the RR intervals corresponding to any point in time, are [1,10,[26][27][28][29]: a) SDNN -Standard deviation of all normal RR intervals recorded in a time interval, expressed in ms; b) SDANN -Represents the standard deviation of the normal RR intervals means, every 5 minutes in a time interval, expressed in ms; c) SDNNi -It is the mean of the standard deviation of normal RR intervals every 5 minutes, expressed in ms; d) rMSSD -is the root-mean square of differences between adjacent normal RR intervals in a time interval, expressed in ms;…”

Section: Linear Methodsmentioning

confidence: 99%

“…The rMSSD and pNN50 indexes represent the parasympathetic activity [1,10,26,27] as they are found from the analysis of adjacent RR intervals [25].…”

Section: Measurement Devicesmentioning

confidence: 99%

“…In hypertrophic cardiomyopathy, it is assumed that the neuronal uptake of norepinephrine is impaired due to a decrease in the density of beta receptors [26]. Studies using HRV indexes in cardiovascular diseases can be seen in Table 1.…”

Section: Clinical Applicationsmentioning

confidence: 99%

“…Table 2 shows studies using HRV in various physiological and pathological conditions. Carnethon et al [56] Novais et al [29] Menezes et al [60] Terathongkum et al [61] Takahashi et al [55] Bittencourt et al [26] Pecyna [63] Carney et al [54] Limongelli et al [58] Karas et al [59] Larosa et al [62] Javorka et al [38] Catai et al [7] Weerapong et al [41] Mello et al [37] Paschoal et al [72] Sin DD et al [66] Kudaiberdieva et al [65] Lopes et al [71] Neves et al [73] Furuland et al [68] Lopes et al [79] and Paschoal et al [80] observed that the aging process causes a depletion of vagal tone and consequent increase in sympathetic activity, therefore older individuals have a lower HRV. In 2006, Rajendra Acharya et al [4] observed that HRV is lower with age and the variation is greater in women.…”

Section: Clinical Applicationsmentioning

confidence: 99%

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Noções básicas de variabilidade da frequência cardíaca e sua aplicabilidade clínica

Vanderlei

Pastre

Hoshi

et al. 2009

Rev Bras Cir Cardiovasc

673

499

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Autonomic nervous system (ANS) plays an important role in the regulation of the physiological processes of the human organism during normal and pathological conditions. Among the techniques used in its evaluation, the heart rate variability (HRV) has arising as a simple and non-invasive measure of the autonomic impulses, representing one of the most promising quantitative markers of the autonomic balance. The HRV describes the oscillations in the interval between consecutive heart beats (RR interval), as well as the oscillations between consecutive instantaneous heart rates. It is a measure that can be used to assess the ANS modulation under physiological conditions, such as wakefulness and sleep conditions, different body positions, physical training and also pathological conditions. Changes in the HRV patterns provide a sensible and advanced indicator of health involvements. Higher HRV is a signal of good adaptation and characterizes a health person with efficient autonomic mechanisms, while lower HRV is frequently an indicator of abnormal and insufficient adaptation of the ANS, provoking poor patient's physiological function. Because of its importance as a marker that reflects the autonomic nervous system activity on the sinus node and as a clinical instrument to assess and identify health involvements, this study reviews conceptual aspects of the HRV, measurement devices, filtering methods, indexes used in the HRV analyses, limitations in the use and clinical applications of the HRV.Descriptors: Autonomic nervous system. Heart rate. Parasympathetic nervous system. Sympathetic nervous system. ResumoO sistema nervoso autônomo (SNA) desempenha um papel importante na regulação dos processos fisiológicos do organismo humano tanto em condições normais quanto patológicas. Dentre as técnicas utilizadas para sua avaliação, a variabilidade da frequência cardíaca (VFC) tem emergido como uma medida simples e não-invasiva dos impulsos autonômicos, representando um dos mais promissores marcadores quantitativos do balanço autonômico. A VFC descreve as oscilações no intervalo entre batimentos cardíacos consecutivos (intervalos R-R), assim como oscilações entre frequências cardíacas instantâneas consecutivas. Trata-se de uma medida que pode ser utilizada para avaliar a modulação do SNA sob condições fisiológicas, tais como em situações de vigília e sono, diferentes posições do corpo, treinamento físico, e também em condições patológicas. Mudanças nos padrões da VFC fornecem um indicador sensível e antecipado de comprometimentos na

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Section: Linear Methodsmentioning

confidence: 99%

“…The rMSSD and pNN50 indexes represent the parasympathetic activity [1,10,26,27] as they are found from the analysis of adjacent RR intervals [25].…”

Section: Measurement Devicesmentioning

confidence: 99%

Section: Clinical Applicationsmentioning

confidence: 99%

Section: Clinical Applicationsmentioning

confidence: 99%

See 2 more Smart Citations

Noções básicas de variabilidade da frequência cardíaca e sua aplicabilidade clínica

Vanderlei

Pastre

Hoshi

et al. 2009

Rev Bras Cir Cardiovasc

673

499

View full text Add to dashboard Cite

show abstract

“…Physical exercise produces increase of contractility and heart rate, effects which, along with the decrease of peripheral vascular resistance, trigger or determine worsening of obstruction and increase in LV filling pressure 26,27 . Syncope or presyncope may be the consequence of arrhythmias or autonomic disorder [28][29][30] , but would derive from outflow tract obstruction when related to larger exertion or to swiftly assuming standing position 31 .…”

Section: Clinical Picturementioning

confidence: 99%

O diagnóstico da obstrução da via de saída do ventrículo esquerdo na cardiomiopatia hipertrófica

Mattos¹,

Torres²,

Rebelatto³

et al. 2012

Arq. Bras. Cardiol.

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Hypertrophic cardiomyopathy is a prevalent genetic disease characterized by left ventricular hypertrophy, presenting dynamic obstruction of outflow tract with subaortic gradient happening at rest in 30% of the cases. It is attributed to the intricate interaction between the anterior mitral leaflet, the interventricular septum and altered flow vectors generated in left ventricle along with changes in outflow tract geometry. Mitral regurgitation in varying degrees is found with or without association with structural deformities of the valve apparatus. The exercise echocardiogram evidences latent obstruction easily induced by exercise in 60 to 75% of nonobstructive forms. The determination of the gradient under this condition must be considered in routine investigation of patients with mild or no obstruction at rest. The evaluation of hypertrophic cardiomyopathy incorporates methods based on the ultrasound image, which, along with MRI, allow recognizing ventricular obstruction generating mechanisms, thus facilitating the diagnosis and management of obstructive and latent obstructive forms.

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Delayed electrocardiographic changes after percutaneous transluminal septal myocardial ablation in hypertrophic obstructive cardiomyopathy

Guo

Wang

Xing

et al. 2007

Journal of Electrocardiology

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Avaliação da função autonômica na cardiomiopatia hipertrófica

Cited by 11 publications

References 29 publications

Noções básicas de variabilidade da frequência cardíaca e sua aplicabilidade clínica

Noções básicas de variabilidade da frequência cardíaca e sua aplicabilidade clínica

O diagnóstico da obstrução da via de saída do ventrículo esquerdo na cardiomiopatia hipertrófica

Delayed electrocardiographic changes after percutaneous transluminal septal myocardial ablation in hypertrophic obstructive cardiomyopathy

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