Pletismografia respiratória por indutância: estudo comparativo entre calibração por manobra de isovolume e calibração qualitativa diagnóstica em voluntários saudáveis avaliados em diferentes posturas

Abstract

Objective: To compare two methods of respiratory inductive plethysmography (RIP) calibration in three different positions. Methods: We evaluated 28 healthy subjects (18 women and 10 men), with a mean age of 25.4 ± 3.9 years. For all of the subjects, isovolume maneuver calibration (ISOCAL) and qualitative diagnostic calibration (QDC) were used in the orthostatic, sitting, and supine positions. In order to evaluate the concordance between the two calibration methods, we used ANOVA and Bland-Altman plots. Results: The values of the constant of proportionality (K) were significantly different between ISOCAL and QDC in the three positions evaluated: 1.6 ± 0.5 vs. ResumoObjetivo: Comparar dois métodos de calibração da pletismografia respiratória por indutância (PRI) em três posturas diferentes. Métodos: Foram avaliados 28 indivíduos saudáveis (18 mulheres e 10 homens), com média de idade de 25,4 ± 3,9 anos. Todos os indivíduos foram submetidos a isovolume maneuver calibration (ISOCAL, calibração por manobra de isovolume) e qualitative diagnostic calibration (QDC, calibração diagnóstica qualitativa) em ortostatismo, sedestação e decúbito dorsal. Foi utilizada ANOVA e a disposição gráfica de Bland-Altman para a avaliação da concordância dos métodos de calibração. Resultados: Os valores da constante de proporcionalidade (K) foram significativamente distintos entre ISOCAL e QDC nas três posturas avaliadas: 1,6 ± 0,5 vs. 2,0 ± 1,2, em decúbito dorsal; 2,5 ± 0,8 vs. 0,6 ± 0,3, em sedestação; e 2,0 ± 0,8 vs. 0,6 ± 0,3, em ortostatismo (p < 0,05 para todos). Conclusões: Nossos resultados sugerem que QDC não é um método acurado para a calibração da PRI. Os valores de K obtidos por ISOCAL mostram que a PRI deve ser calibrada para cada postura avaliada.Descritores: Pletismografia; Mecânica respiratória; Postura; Calibragem. where SD(∆ U V AB ) and SD(∆ U V CT ) are the standard deviations of the electrical signals related to the abdomen and rib cage, respectively. (4,8,9) Although ISOCAL is considered the gold standard for RIP calibration, the vast majority of studies employ QDC because the method requires no specific respiratory maneuvers. (10)(11)(12)(13) We are unaware of any studies comparing the two methods of RIP calibration regarding the values of the constant K when different positions are employed.

Changes in breathing while listening to read speech: the effect of reader and speech mode

“…Usually the relative contribution of the rib cage and the abdomen displacements to the lung volume is computed for each subject using different methods. It has been shown that these methods are more or less reliable (Konno and Mead, 1967; Sackner et al, 1989; Banzett et al, 1995; Barbosa et al, 2012). With the Inductotrace, using a fixed factor of 2:1 (rib cage to abdomen) for all subjects allows a reliable estimation of the lung volume, at least for subjects with standard morphology (Banzett et al, 1995; see also Poole et al, 2000 for an evaluation with children).…”

Respiratory inductance plethysmography calibration for pediatric upper airway obstruction: an animal model

“…Some have demonstrated in adults that RIP calibration factors generated from isovolume maneuvers are similar to those obtained during 5 minutes of tidal breathing (using Quantitative Diagnostic Calibration (QDC)) ( 11 ) and that QDC calibrated RIP signals combined with esophageal manometry can detect flow-limitation for adults with obstructive sleep apnea ( 5 ). Others have found conflicting results ( 12 – 14 ). In children, QDC calibration may work with minimal respiratory disease ( 15 , 16 ).…”

Intra- And Inter-Rater Reliability of a Biophotogrammetric Assessment Protocol for Preterm Infants

“…10,11 The thoracic motion and pulmonary function assessments allow the situational diagnosis of the baby and the prevention of possible diseases. Single and multiple occlusion techniques, cirtometry, 12 and inductance plethysmography 13 are some of the methods used for these purposes. Some of these techniques are compatible with the adult and pediatric population, as is the case of cirtometry, but they are dysfunctional when applied to neonatology.…”

“…Some of these techniques are compatible with the adult and pediatric population, as is the case of cirtometry, but they are dysfunctional when applied to neonatology. 12,13 Innovating and adapting methods to meet the needs of the neonatal population are relevant and necessary.…”