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J. bras. pneumol ; 41(5): 422-426, tab
Article in English | LILACS | ID: lil-764573

ABSTRACT

Objective: To evaluate peripheral respiratory system resistance and reactance (Rrs and Xrs, respectively) in obese individuals.Methods: We recruited 99 individuals, dividing them into four groups by body mass index (BMI): < 30.0 kg/m2 (control, n = 31); 30.0-39.9 kg/m2 (obesity, n = 13); 40.0-49.9 kg/m2 (severe obesity, n = 28); and ≥ 50.0 kg/m2 (morbid obesity, n = 13). Using impulse oscillometry, we measured total Rrs, central Rrs, and Xrs. Peripheral Rrs was calculated as the difference between total Rrs and central Rrs. All subjects also underwent spirometry.Results: Of the 99 individuals recruited, 14 were excluded because they failed to perform forced expiratory maneuvers correctly during spirometry. The individuals in the severe obesity and morbid obesity groups showed higher peripheral Rrs and lower Xrs in comparison with those in the two other groups.Conclusions: Having a BMI ≥ 40 kg/m2 was associated with a significant increase in peripheral Rrs and with a decrease in Xrs.


Objetivo: Avaliar a resistência do sistema respiratório (Rsr) periférica e a reatância (Xsr) em indivíduos obesos.Métodos: Recrutamos 99 indivíduos, divididos em quatro grupos pelo índice de massa corpórea (IMC): < 30,0 kg/m2; (controle, n = 31); 30,0-39,9 kg/m2 (obesidade, n = 13); 40,0-49,9 kg/m2 (obesidade grave, n = 28); e ≥ 50,0 kg/m2 (obesidade mórbida, n = 13). Utilizando oscilometria de impulso, foram mensuradas Rsr total, Rsr central, Xsr. A Rsr periférica foi calculada como a diferença entre Rsr total e Rsr central. Todos os indivíduos também foram submetidos a espirometria.Resultados: Entre os 99 indivíduos recrutados, 14 foram excluídos por incapacidade de executar corretamente as manobras expiratórias forçadas na espirometria. Os indivíduos dos grupos obesidade grave e obesidade mórbida apresentaram aumento da Rsr periférica e redução da Xsr quando comparados aos dos outros grupos.Conclusões: Ter IMC ≥ 40 kg/m2 associou-se com aumento significativo da Rsr periférica e redução da Xsr.


Subject(s)
Adult , Female , Humans , Male , Middle Aged , Young Adult , Obesity/physiopathology , Respiratory Physiological Phenomena , Analysis of Variance , Body Mass Index , Case-Control Studies , Oscillometry/methods , Reference Values , Respiratory Function Tests , Severity of Illness Index , Statistics, Nonparametric
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