title: Is portable monitoring accurate in the diagnosis of obstructive sleep apnea syndrome in chronic pulmonary obstructive disease?
abstract: BACKGROUND
  No scientific evidence supports the use of portable devices to diagnose obstructive sleep apnea syndrome (OSAS) in patients with co-morbities. Our aim was to evaluate the accuracy of a portable monitoring device (Stardust - STD) in the detection of patients with chronic obstructive pulmonary disease (COPD).
  
  
  METHODS
  Patients with COPD and clinical suspicion of OSAS were recruited for a prospective randomized study. The STD was used on two different nights: (1) at home (STDHome) and (2) at the sleep laboratory simultaneous with polysomnography (PSG-STDLab).
  
  
  RESULTS
  A total of 72 patients underwent the proposed recordings. Forty-six volunteers were excluded due to recording problems, and data from 26 subjects were analyzed. The mean age was (mean±SD) 62.8±8.5 years, 50% were male, and the mean forced expiratory volume in the first second was 55±11%. Significant intraclass correlation was observed between apnea-hypopnea index (AHI)-PSG vs. AHI-STDLab (r=0.61, p<0.0001) and AHI-STDHome (r=0.47, p<0.007). Kappa analysis also showed a significant agreement for severe group.
  
  
  CONCLUSIONS
  Despite the agreement found in a small number of patients between AHI, a large number of failures in the recording limits the use of this portable device for the diagnosis of OSAS in patients with COPD.
authors: Disciplina de Pneumologia, Departamento de Clínica Médica, Universidade Federal de Sao Paulo - UNIFESP, Sao Paulo/SP, Brazil.
authors: Marcia Gonçalves
authors: MG
authors: Oliveira
authors: Luiz Eduardo
authors: LE
authors: Nery
authors: Rogerio
authors: R
authors: Santos-Silva
authors: Denis Eduardo
authors: DE
authors: Sartori
authors: Fabiana Fernanda
authors: FF
authors: Alonso
authors: Sonia Maria
authors: SM
authors: Togeiro
authors: Sergio
authors: S
authors: Tufik
authors: Lia
authors: L
authors: Bittencourt
mesh_terms: D000368:Aged; D005260:Female; D005541:Forced Expiratory Volume; D006801:Humans; D008297:Male; D008875:Middle Aged; D018670:Monitoring, Ambulatory / Q000295:instrumentation / Q000379:methods / Q000592:standards*; D017286:Polysomnography / Q000295:instrumentation / Q000379:methods / Q000592:standards*; D011446:Prospective Studies; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications*; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D020181:Sleep Apnea, Obstructive / Q000150:complications* / Q000175:diagnosis*