Papel da oximetria nocturna no rastreio da síndroma de apneia-hipopneia obstrutiva do sono

Translated title of the contribution: The role of nocturnal oximetry in obstructive sleep apnoea-hypopnoea syndrome screening

Celestina Ventura, Ana Sofia Oliveira, Rita Dias, Joana Teixeira, Cristina Canhão, Odete Santos, Paula Pinto, Cristina Bárbara

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Aim: The aim of our study was to evaluate the sensitivity and specificity of Nocturnal Oximetry (NO) as a diagnostic Screening tool for obstructive sleep apnoea hypopnoea syndrome (OSAHS), compared with polysomnography (PSG) as the gold standard. Methodology: 63 patients with clinical suspicion of OSAHS and exclusion of respiratory disease underwent PSG and NO. We then determined NO sensitivity, specificity, positive (PPV) and negative predictive values (NPV). Results: OSAHS was diagnosed in 47 patients with a mean age of 54 years. In the evaluation of the percentage of Total Sleep Time (TST) with oxygen desaturation below 90%, we found significant differences between patients with OSAHS (25.4 ± 29.7%) and without OSAHS (1 ± 1.5%), p<0,001. We used two cutoff points to evaluate sensitivity, specificity, positive (PPV) and negative predictive values (NPV), based on the severity of O 2 desaturation (StO 2 <90%). Using the first cutoff point we diagnosed with NO as positive all the patients with TST desaturation values ≥1% of the TST. Under these circumstances we found a sensitivity of 76.6%, a specificity of 75%, a PPV of 90% and an NPV value of 52.2% for our screening test (NO). Using the second cutoff point, we diagnosed with NO as positive all the patients with TST desaturation values ≥5% of the TST. With this method we found a sensitivity of 65.9%, a specificity of 100%, a PPV of 100% and an NPV of 50%. Conclusion: NO is a useful screening test for the diagnosis of OSAHS in patients without respiratory disease.

Translated title of the contributionThe role of nocturnal oximetry in obstructive sleep apnoea-hypopnoea syndrome screening
Original languagePortuguese
Pages (from-to)525-551
Number of pages27
JournalRevista Portuguesa de Pneumologia
Volume13
Issue number4
Publication statusPublished - 1 Jan 2007

Keywords

  • Nocturnal oximetry
  • Obstructive sleep apnoea hypopnoea syndrome

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