Factors Affecting Lung Function: A Review of the Literature

Talaminos-Barroso, Alejandro; Martín, Eduardo Márquez; Romero, Laura María Roa; Ruiz, Francisco Órtega

doi:10.1016/j.arbr.2018.04.003

Cited by 79 publications

(33 citation statements)

References 68 publications

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“…It has been reported that the total lung capacity (TLC) measured by pulmonary function tests (PFTs) using spirometry in the standing position is higher than that obtained in the supine position [8, 9]; however, neither the unilateral lung volume nor the volume of each lung lobe can be measured by PFT. On the other hand, CT volumetry can provide the volumes of the unilateral lung and each lobe of the lung [10-13] and has been reported to enable more accurate predictions of postoperative residual pulmonary function in patients with lung cancer than the segment-counting method, which is based solely on the number of remaining pulmonary segments [10-12].…”

Section: Introductionmentioning

confidence: 99%

Differences in Lung and Lobe Volumes between Supine and Standing Positions Scanned with Conventional and Newly Developed 320-Detector-Row Upright CT: Intra-Individual Comparison

Yamada

Yokoyama

et al. 2020

Respiration

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Background: No clinical studies to date have compared unilateral lung or lobe volumes between the supine and standing positions. Objectives: To compare lung/lobe volumes on computed tomography (CT) between these two positions and evaluate the correlation between the total lung volume and total lung capacity (TLC) on pulmonary function tests (PFTs). Methods: Thirty-two asymptomatic volunteers underwent both conventional CT (supine position) and upright CT (standing position), during deep inspiration breath-hold, and PFTs on the same day. We measured lung/lobe volumes on CT in each position. Paired t tests were used for statistical analysis. Results: The volumes of the total lung (10.

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Section: Introductionmentioning

confidence: 99%

Differences in Lung and Lobe Volumes between Supine and Standing Positions Scanned with Conventional and Newly Developed 320-Detector-Row Upright CT: Intra-Individual Comparison

Yamada

Yokoyama

et al. 2020

Respiration

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“…Pulmonary function may be affected by various intrinsic (age, gender and ethnicity) and extrinsic (air pollution, smoking and biomass) factors 1 . In addition, it is impaired in extrapulmonary diseases such as cardiovascular disease 2 and chronic kidney disease 3 .…”

Section: Introductionmentioning

confidence: 99%

Pulmonary function is associated with fibrosis severity in patients with biopsy‐proven nonalcoholic fatty liver disease

Lee

et al. 2020

Liver International

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Background & Aims The association between nonalcoholic fatty liver disease (NAFLD) and pulmonary function remains elusive because of the heterogeneous spectrum and inaccurate diagnostic methods of NAFLD, and insufficient pulmonary function data. We conducted this study to identify the association between histological severity of NAFLD and pulmonary function. Methods This study included patients ≥18 years old with baseline pulmonary function data between August 2014 and July 2019 within a biopsy‐evaluated prospective NAFLD cohort. Cross‐sectionally, pre‐/post‐bronchodilator spirometric data with diffusing capacity (DLCO) were compared according to histological severity of NAFLD in the various demographic and metabolic subgroups. Multivariable‐adjusted analysis revealed specific histological features associated with reduced pulmonary function. Results In a total of 420 patients with biopsy‐proven NAFLD, pre‐/post‐bronchodilator forced vital capacities (FVCs; a percentage of the predictive value) were inversely correlated with histological severity of NAFLD. Conversely, pre‐bronchodilator forced expiratory volume in 1 second (FEV1)/FVC was positively correlated with NAFLD severity. Post‐bronchodilator FVC (%) decreased and DLCO/alveolar volume (VA) increased linearly with worsening histological severity of NAFLD in multivariable analysis. In particular, fibrosis stage remained a significant independent predictor of decreased post‐bronchodilator FVC (%) (β‐coefficient, 4.41; 95% confidence interval [−8.39, −0.43]; P = .031) even after adjusted for clinical variables, exclusively in age <65 years, female, never‐smoker and nonchronic obstructive pulmonary disease subgroups. Conclusions Pulmonary function deteriorates with worsening histological severity of NAFLD, especially at the fibrosis stage. The common pathogenesis of reduced pulmonary function and NAFLD fibrosis progression should be further explored.

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“…The AUC values for EMG per breathing cycle for different tidal volumes collected at the diaphragm for the male subject is higher than the female subject. It is known that lung function is influenced by multiple factors, including age, sex/gender, and height [34,35]. We speculate that the EMG data collected at the diaphragm may also change between different individuals depending on age, sex/gender, and height.…”

Section: Discussionmentioning

confidence: 85%

Extraction and Analysis of Respiratory Motion Using a Comprehensive Wearable Health Monitoring System

George

Moon

Lee

2021

Sensors

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Respiratory activity is an important vital sign of life that can indicate health status. Diseases such as bronchitis, emphysema, pneumonia and coronavirus cause respiratory disorders that affect the respiratory systems. Typically, the diagnosis of these diseases is facilitated by pulmonary auscultation using a stethoscope. We present a new attempt to develop a lightweight, comprehensive wearable sensor system to monitor respiration using a multi-sensor approach. We employed new wearable sensor technology using a novel integration of acoustics and biopotentials to monitor various vital signs on two volunteers. In this study, a new method to monitor lung function, such as respiration rate and tidal volume, is presented using the multi-sensor approach. Using the new sensor, we obtained lung sound, electrocardiogram (ECG), and electromyogram (EMG) measurements at the external intercostal muscles (EIM) and at the diaphragm during breathing cycles with 500 mL, 625 mL, 750 mL, 875 mL, and 1000 mL tidal volume. The tidal volumes were controlled with a spirometer. The duration of each breathing cycle was 8 s and was timed using a metronome. For each of the different tidal volumes, the EMG data was plotted against time and the area under the curve (AUC) was calculated. The AUC calculated from EMG data obtained at the diaphragm and EIM represent the expansion of the diaphragm and EIM respectively. AUC obtained from EMG data collected at the diaphragm had a lower variance between samples per tidal volume compared to those monitored at the EIM. Using cubic spline interpolation, we built a model for computing tidal volume from EMG data at the diaphragm. Our findings show that the new sensor can be used to measure respiration rate and variations thereof and holds potential to estimate tidal lung volume from EMG measurements obtained from the diaphragm.

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Factors Affecting Lung Function: A Review of the Literature

Cited by 79 publications

References 68 publications

Differences in Lung and Lobe Volumes between Supine and Standing Positions Scanned with Conventional and Newly Developed 320-Detector-Row Upright CT: Intra-Individual Comparison

Differences in Lung and Lobe Volumes between Supine and Standing Positions Scanned with Conventional and Newly Developed 320-Detector-Row Upright CT: Intra-Individual Comparison

Pulmonary function is associated with fibrosis severity in patients with biopsy‐proven nonalcoholic fatty liver disease

Extraction and Analysis of Respiratory Motion Using a Comprehensive Wearable Health Monitoring System

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