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- ItemSomente MetadadadosInspiratory Flow Limitation in a Normal Population of Adults in São Paulo, Brazil(Amer Acad Sleep Medicine, 2013-11-01) Palombini, Luciana de Oliveira [UNIFESP]; Tufik, Sergio [UNIFESP]; Rapoport, David M.; Ayappa, Indu A.; Guilleminault, Christian; Godoy, Luciana Ballester Mello de [UNIFESP]; Castro, Laura de Siqueira [UNIFESP]; Bittencourt, Lia Rita Azeredo[UNIFESP]; Universidade Federal de São Paulo (UNIFESP); NYU; Stanford UnivStudy Objectives: Inspiratory flow limitation (IFL) during sleep occurs when airflow remains constant despite an increase in respiratory effort. This respiratory event has been recognized as an important parameter for identifying sleep breathing disorders. the purpose of this study was to investigate how much IFL normal individuals can present during sleep.Design: Cross-sectional study derived from a general population sample.Setting: A normal asymptomatic sample derived from the epidemiological cohort of São Paulo.Patients and Participants: This study was derived from a general population study involving questionnaires and nocturnal polysomnography of 1,042 individuals. A subgroup defined as a nonsymptomatic healthy group was used as the normal group.Interventions: N/A.Measurements and Results: All participants answered several questionnaires and underwent full nocturnal polysomnography. IFL was manually scored, and the percentage of IFL of total sleep time was considered for final analysis. the distribution of the percentage of IFL was analyzed, and associated factors (age, sex, and body mass index) were calculated. There were 95% of normal individuals who exhibited IFL during less than 30% of the total sleep time. Body mass index was positively associated with IFL.Conclusions: Inspiratory flow limitation can be observed in the polysomnography of normal individuals, with an influence of body weight on percentage of inspiratory flow limitation. However, only 5% of asymptomatic individuals will have more than 30% of total sleep time with inspiratory flow limitation. This suggests that only levels of inspiratory flow limitation > 30% be considered in the process of diagnosing obstructive sleep apnea in the absence of an apnea-hypopnea index > 5 and that < 30% of inspiratory flow limitation may be a normal finding in many patients.
- ItemSomente MetadadadosNew Insights on the Pathophysiology of Inspiratory Flow Limitation During Sleep(Springer, 2015-06-01) Godoy, Luciana B. M. de [UNIFESP]; Palombini, Luciana O. [UNIFESP]; Martinho Haddad, Fernanda L. [UNIFESP]; Rapoport, David M.; Vidigal, Tatiana de Aguiar [UNIFESP]; Klichouvicz, Priscila Calixto [UNIFESP]; Tufik, Sergio [UNIFESP]; Togeiro, Sonia M. [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); NYUInspiratory flow limitation (IFL) is defined as a flattened shape of inspiratory airflow contour detected by nasal cannula pressure during sleep and can indicate increased upper airway resistance especially in mild sleep-related breathing disorders (SRBD). the objective of this study was to investigate the association between upper airway abnormalities and IFL in patients with mild SRBD.This study was derived from a general population study consisting of selected individuals with apnea-hypopnea index (AHI) below 5 events/h of sleep, (no obstructive sleep apnea group) and individuals with AHI between 5 and 15 events/h (mild obstructive sleep apnea group). A total of 754 individuals were divided into four groups: group 1: AHI < 5/h and < 30 % of total sleep time (TST) with IFL (515 individuals), group 2: AHI < 5/h and > 30 % of TST with IFL (46 individuals), group 3: AHI: 5-15/h and < 30 % of TST with IFL (168 individuals), and group 4: AHI: 5-15/h and > 30 % of TST with IFL (25 individuals).Individuals with complains of oral breathing demonstrated a risk 2.7-fold larger of being group 4 compared with group 3. Abnormal nasal structure increased the chances of being in group 4 3.2-fold in comparison to group 1. Individuals with voluminous lateral wall demonstrated a risk 4.2-fold larger of being group 4 compared with group 3.More than 30 % of TST with IFL detected in sleep studies was associated with nasal and palatal anatomical abnormalities in mild SRBD patients.