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Updated: May 28, 2026

Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea
Published on: December 6, 2016
Negative expiratory pressure test: a new, simple method to identify patients at risk for obstructive sleep apnea
Luis Vicente Franco de Oliveira1, Salvatore Romano, Raquel Pastréllo Hirata
1Graduate Program in Rehabilitation Sciences, Nove de Julho University, São Paulo, Brazil. oliveira.lvf@pq.cnpq.br
Abstract:
The objective of this article was to describe a new method for assessing expiratory flow limitation during spontaneous breathing, using the negative expiratory pressure test to identify patients at risk for obstructive sleep apnea. Upper airway collapsibility is evaluated by measuring decreases in flow and in expired volume in the first 0.2 seconds after negative expiratory pressure application at 10 cmH₂O. The negative expiratory pressure test is easily applied and could be adopted for the evaluation of expiratory flow limitation caused by upper airway obstruction in patients with obstructive sleep apnea.
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