Measuring slow vital capacity to detect airflow limitation in a woman with dyspnea and a preserved FEV1/FVC ratio

Berton, Danilo Cortozi; Neder, J. Alberto

doi:10.1590/1806-3713/e20190084

Cited by 2 publications

(4 citation statements)

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“…The positive response of these patients towards inhaled albuterol treatment further proved the presence of obstructive ventilatory defect. 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.…”

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

confidence: 87%

“…On the other hand, during the relaxed maneuvers of SVC, the airway closure is delayed due to little dynamic compression of the airways and low intrathoracic pressure resulting in a lower RV and higher SVC as more air gets mobilized. 3,7,[11][12][13][14][15] This difference between SVC and FVC has been referred to as an index of small airways collapse and increases further when more airways obstruction is present and the disease is more severe. 3,6,12 Other authors have applied the ratio between FVC to SVC as an indicator of small airways collapse and air trapping.…”

Section: Introductionmentioning

confidence: 99%

“…10 It is also suggested the FVC decreases with age at a faster rate than SVC and that a low FEV1/SVC ratio might simply reflect the physiological changes of aging. 13 Mathieu Saint-Pierre et al have shown that FEV1/SVC should be used with caution in elderly subjects [age >70 years] with preserved FEV 1 /FVC because a low value may represent a false positive finding for air flow obstruction. 9 The FVC decreases with age due to the reduced chest wall compliance and expiratory muscle strength and a greater tendency of smaller airways to close during the forced maneuver.…”

Section: Introductionmentioning

confidence: 99%

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

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Slow vital capacity

et al. 2020

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“…Occasionally, however, FVC decreases roughly in tandem with FEV 1 as RV increases despite a preserved TLC, reflecting increased small airway collapse/closure at low lung volumes during the forced maneuver. 5 In fact, a sizeable number of symptomatic smokers with no spirometric evidence of obstruction may show gas trapping and/or ↓DLCO plus structural changes in keeping with COPD. 1 Indeed, some such individuals may benefit clinically from a more proactive approach toward early treatment with BDs.…”

Section: Overviewmentioning

confidence: 99%