Underdiagnosis of Obstructive Airways Disease by Spirometry

Rasheed, Ameer; Vasudevan, Viswanath; Shahzad, Saleem; Arjomand, Farhad; Reminick, Scott

doi:10.1378/chest.1118407

Cited by 3 publications

(4 citation statements)

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“…The study by Rasheed et al ( 9 ) examined two groups of individuals, grouped by underlying disease process (asthma or COPD), and showed a discrepancy between the FEV 1 /SVC and FEV 1 /FVC ratios in 17% of the sample as a whole; in the asthma and COPD groups, this discrepancy was observed in 22% and 13% of the patients, respectively. …”

Section: Discussionmentioning

confidence: 99%

“…Studies by Chhabra ( 8 ) and Rasheed et al ( 9 ) also examined the use of the FEV 1 /FVC ratio or the FEV 1 /SVC ratio as a criterion for the presence of airway obstruction. The study by Chhabra ( 8 ) showed that the differences among the FEV 1 /FVC, VEF 1 /expiratory VC, and FEV 1 /inspiratory VC ratios in healthy individuals and in those with mild obstruction were not significant; however, those differences were statistically significant in individuals with at least moderate obstruction.…”

Section: Discussionmentioning

confidence: 99%

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Importance of slow vital capacity in the detection of airway obstruction

2013

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OBJECTIVE: To investigate the presence of airway obstruction by determining the FEV1/FVC and FEV1/slow vital capacity (SVC) ratios. METHODS: This was a quantitative, retrospective cross-sectional study. The sample comprised 1,084 individuals who underwent spirometry and plethysmography in a central hospital in Lisbon, Portugal. The study sample was stratified into six groups, by pulmonary function. RESULTS: The analysis of the FEV1/FVC ratio revealed the presence of airway obstruction in 476 individuals (43.9%), compared with 566 individuals (52.2%) for the analysis of the FEV1/SVC ratio. In the airway obstruction, airway obstruction plus lung hyperinflation, and mixed pattern groups, the difference between SVC and FVC (SVC − FVC) was statistically superior to that in the normal pulmonary function, reduced FEF, and restrictive lung disease groups. The SVC − FVC parameter showed a significant negative correlation with FEV1 (in % of the predicted value) only in the airway obstruction plus lung hyperinflation group. CONCLUSIONS: The FEV1/SVC ratio detected the presence of airway obstruction in more individuals than did the FEV1/FVC ratio; that is, the FEV1/SVC ratio is more reliable than is the FEV1/FVC ratio in the detection of obstructive pulmonary disease.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Importance of slow vital capacity in the detection of airway obstruction

2013

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“…In another study by Rasheed et al, the discrepancy between the two ratios of the total sample (asthma and COPD groups) was 17%. 8 In this study, we measured the difference between SVC and FVC based on the respiratory patterns. The findings of the present study showed that the difference between SVC and FVC (SVC-FVC) was greater in obstruction and mixed group.…”

Section: Discussionmentioning

confidence: 99%

Which is better among FEV1/FVC and FEV1/SVC in obstructive airway disease?

2018

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Background: Forced expiratory volume in 1 second (FEV1) to forced vital capacity ratio (FVC) is being used to diagnose the obstructive lung diseases. Forced manoeuvre (FVC) or relaxed/slow manoeuvre (SVC) can be used to determine vital capacity (VC). In healthy individuals the difference between SVC and FVC (SVC-FVC) is minimal whereas in the presence of airway obstruction this difference will become significant. The present study was done with the objective to detect and compare the airway obstruction by determining the FEV1/FVC and FEV1/ SVC ratios.Methods: This was a prospective cross-sectional study done at OPD, Government Thiruvoteeswarar hospital of thoracic medicine/Kilpauk medical college during the period from September 2016 to February 2017among the patients presenting with symptoms of obstructive airway disease. The sample comprised of 353 patients who underwent spirometry according to standard of ATS/ERS guidelines. As per the criteria, the patients are classified into four groups, by spirometry.Results: The analysis of FEV1/FVC revealed the presence of airway obstruction in 131 (37%) individuals compared to 165 (46%) individuals by the analysis of Fev1/SVC ratio. In the obstruction and mixed groups, the difference in vital capacity SVC – FVC is statistically superior (p<0.05) when compared to normal and restriction groups.Conclusions: The FEV1/SVC ratio detected the presence of airway obstruction in more individuals than did FEV1/FVC ratio and hence FEV1/SVC considered as more reliable factor in the detection of obstructive airway diseases.

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“…13 Similar results have been reported by others as well. [46][47][48][49] Studies showing the role of SVC and FVC in obstructive lung disease are summarized in Table 2. The analysis of the FEV1/FVC ratio revealed the presence of airway obstruction in 476 individuals (43.9%), compared with 566 individuals (52.2%) for the analysis of the FEV1/SVC ratio.…”

Section: Huprikar Et Al Performed a Retrospective Analysis Of 2710mentioning

confidence: 99%

Slow vital capacity

et al. 2020

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Forced vital capacity (FVC) and slow vital capacity (SVC) are non-invasive tests of respiratory function. Although FVC has been extensively studied and is used in most PFT (pulmonary function test) labs, SVC can also be used in clinical practice as it is a more comfortable and convenient test to perform. SVC-based diagnostic criteria can lead to earlier detection of obstructive lung disease. In contrast to FVC, SVC is less affected by respiratory muscle fatigue, airflow patency, expiratory muscle weakness and air leakage making it an appropriate test of respiratory function in patients of amyotrophic lateral sclerosis (ALS) and other neuromuscular disorders. As respiratory insufficiency is the major cause of mortality in ALS patients, regular SVC measurement provides the respiratory functional status, so that early treatment can be started which improves the survival and quality of life in these patients. The purpose of this article is to highlight the importance of considering SVC in clinical practice.

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Underdiagnosis of Obstructive Airways Disease by Spirometry

Cited by 3 publications

References 0 publications

Importance of slow vital capacity in the detection of airway obstruction

Importance of slow vital capacity in the detection of airway obstruction

Which is better among FEV1/FVC and FEV1/SVC in obstructive airway disease?

Slow vital capacity

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