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Master's Dissertation
DOI
10.11606/D.5.2013.tde-02082013-151521
Document
Author
Full name
Roberta Potenza da Cunha Ribeiro
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Gualano, Bruno (President)
Silva, Hamilton Augusto Roschel da
Benatti, Fabiana Braga
Title in Portuguese
Verificação da presença de incompetência cronotrópica em pacientes com fibromialgia
Keywords in Portuguese
Disautonomias primárias
Estudos transversais
Fibromialgia
Frequência cardíaca
Mulheres
Teste de esforço
Abstract in Portuguese
Os objetivos deste projeto foram avaliar o comportamento da modulação autonômica cardíaca em resposta ao exercício e logo após o mesmo e verificar a prevalência de insuficiência cronotrópica (IC) na coorte de pacientes com fibromialgia. Métodos: Quatorze mulheres com FM [idade 46 ± 3 anos; índice de massa corpórea (IMC) 26,6 ± 1,4 kg/ m2] e quatorze indivíduos saudáveis (controle) pareados por gênero, IMC (25,4 ± 1,3 kg/m2) e idade (41 ± 4 anos) fizeram parte desse estudo de corte transversal. As participantes foram submetidas a um teste ergoespirométrico em esteira onde foram avaliados o comportamento da frequência cardíaca (FC) durante o teste e logo após o término do mesmo. A reserva cronotrópica (RC) e a FC de recuperação no primeiro (deltaFCR1) e segundo (deltaFCR2) minutos após o teste foram calculadas para verificar a presença de disautonomia e de IC. Resultado: Pacientes com FM apresentaram menor consumo de oxigênio máximo (VO2max) quando comparadas com os sujeitos saudáveis (22 ± 1 versus controle: 32 ± 2 ml/kg/minuto, respectivamente, P < 0,001). Adicionalmente, as pacientes com FM apresentaram menor reserva cronotrópica (72,5 ± 5% versus controle: 106,1 ± 6%, P < 0,001), deltaFCR1 ( 24,5 ± 3bpm versus controle: 32,6 ± 2bpm, P = 0,059) e deltaFRC2 (34,3 ± 4bpm versus controle: 50,8 ± 3bpm, P = 0,002) do que seus pares saudáveis. A prevalência de IC foi de 57,1% entre as pacientes com FM. Conclusões: Pacientes com FM apresentaram disautonomia tanto durante o exercício quanto na recuperação do mesmo, e ainda, essa coorte de pacientes apresentou uma alta prevalência de IC.
Title in English
Verification of the presence of autonomic impairment and chronotropic incompetence in patients with fibromyalgia
Keywords in English
Cross-sectional studies
Exercise test
Fibromyalgia
Heart rate
Primary dysautonomias
Women
Abstract in English
We aimed to gather knowledge on the cardiac autonomic modulation in patients with fibromyalgia (FM) in response to exercise and to investigate whether this population suffers from chronotropic incompetence (CI). Methods: Fourteen women with FM (age: 46 ± 3 years; body mass index (BMI): 26.6 ± 1.4 kg/m2) and 14 gender-, BMI- (25.4 ± 1.3 kg/m2), and agematched (age: 41 ± 4 years) healthy individuals (CTRL) took part in this crosssectional study. A treadmill cardiorespiratory test was performed and heart-rate (HR) response during exercise was evaluated by the chronotropic reserve. HR recovery (deltaHRR) was defined as the difference between HR at peak exercise and at both first (deltaHRR1) and second (deltaHRR2) minutes after the exercise test. Results: FM patients presented lower maximal oxygen consumption (VO2 max) when compared with healthy subjects (22 ± 1 versus CTRL: 32 ± 2 mL/kg/minute, respectively; P < 0.001). Additionally, FM patients presented lower chronotropic reserve (72.5 ± 5%versus CTRL: 106.1 ± 6%, P < 0.001), deltaHRR1 (24.5 ± 3hpm versus CTRL: 32.6 ± 2hpm, P = 0.059) and deltaHRR2 (34.3 ± 4hpm versus CTRL: 50.8 ± 3hpm, P = 0.002) than their healthy peers. The prevalence of CI was 57.1% among patients with FM. Conclusions: Patients with FM who undertook a graded exercise test may present CI and delayed HR recovery, both being indicative of cardiac autonomic impairment and higher risk of cardiovascular events and mortality.
 
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Publishing Date
2013-08-07
 
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