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“Saw-Tooth Sign” in upper airway disorders — a case report
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Abstract
Spirometry flow-volume loop measurement is the screening test of choice to rule out obstructive lung diseases. Flow oscillations occasionally seen on flow volume loops, referred to as a “saw-tooth” sign, are thought to be due to an upper airway obstructive processes associated with upper airway collapsibility. Widely described in obstructive sleep apnea syndrome, flow oscillations have also been linked to many other upper airway pathologies. The mechanism by which flow oscillations occur is centered on the inspiratory and expiratory flow of air. It has been theorized that the mechanism of flow oscillations result from rapid intermittent changes in driving pressure or airway resistance. Since visual inspection of the flow volume loop can reveal presence of flow oscillations clinicians should be aware of this phenomenon and the presence of flow loop oscillations should clue physicians to rule out upper airway pathology.
Abstract
Spirometry flow-volume loop measurement is the screening test of choice to rule out obstructive lung diseases. Flow oscillations occasionally seen on flow volume loops, referred to as a “saw-tooth” sign, are thought to be due to an upper airway obstructive processes associated with upper airway collapsibility. Widely described in obstructive sleep apnea syndrome, flow oscillations have also been linked to many other upper airway pathologies. The mechanism by which flow oscillations occur is centered on the inspiratory and expiratory flow of air. It has been theorized that the mechanism of flow oscillations result from rapid intermittent changes in driving pressure or airway resistance. Since visual inspection of the flow volume loop can reveal presence of flow oscillations clinicians should be aware of this phenomenon and the presence of flow loop oscillations should clue physicians to rule out upper airway pathology.
Keywords
saw tooth sign, flow oscillations, spirometry, obstructive sleep apnea, upper airway disorder
About this articleTitle
“Saw-Tooth Sign” in upper airway disorders — a case report
Journal
Advances in Respiratory Medicine
Issue
Article type
Case report
Pages
140-143
Page views
1359
Article views/downloads
4389
DOI
10.5603/PiAP.2015.0022
Pubmed
Bibliographic record
Pneumonol Alergol Pol 2015;83(2):140-143.
Keywords
saw tooth sign
flow oscillations
spirometry
obstructive sleep apnea
upper airway disorder
Authors
Sonu Sahni
Alexander Blood
Santhosh Paulus
Arunabh Talwar
