PURPOSE: Despite being used in large cohort studies, role of polysomnography (PSG) type 2 is still controversy. This study was aimed to determine its accuracy, reliability, and feasibility in diagnosis of obstructive sleep apnea (OSA) compared to gold standard. METHODS: Adult patients with stable medical conditions who complained of snoring or excessive sleepiness and lived around Bangkok were recruited from a sleep clinic. All were asked to fill questionnaires and have PSG done in laboratory (in-Lab PSG) and at home (Home PSG) on separate nights within 2-4 weeks interval. RESULTS: Eighty-six patients, 48 males and 38 females, were included. Mean of total sleep time, sleep efficiency, and stage R were significantly greater in Home PSG than in-Lab PSG (p<0.05). Apnea-hypopnea index (AHI) was slightly higher in Home PSG (25.7 versus 23.5, p=0.04), but with excellent reliability, intra-class correlation coefficients of 0.96 (95% CI; 0.93-0.97), and good agreements (κ=0.59-0.70) between both tests. The sensitivity, specificity, and accuracy of Home PSG at cut-off point of AHI≥5, were 0.97, 0.56, and 0.85, respectively, and at AHI≥15 were 0.95, 0.76, and 0.85, respectively. Sixty-four patients (74.4%) preferred home-PSG but four patients (4.7%) needed repeated tests due to significant data loss. CONCLUSIONS: This is the first report in Asia demonstrating that home-based diagnosis of OSA by PSG type 2 was feasible performing with good reliability, high accuracy, and a low failure rate. However, further studies focusing on its cost-effectiveness are required.
PURPOSE: Despite being used in large cohort studies, role of polysomnography (PSG) type 2 is still controversy. This study was aimed to determine its accuracy, reliability, and feasibility in diagnosis of obstructive sleep apnea (OSA) compared to gold standard. METHODS: Adult patients with stable medical conditions who complained of snoring or excessive sleepiness and lived around Bangkok were recruited from a sleep clinic. All were asked to fill questionnaires and have PSG done in laboratory (in-Lab PSG) and at home (Home PSG) on separate nights within 2-4 weeks interval. RESULTS: Eighty-six patients, 48 males and 38 females, were included. Mean of total sleep time, sleep efficiency, and stage R were significantly greater in Home PSG than in-Lab PSG (p<0.05). Apnea-hypopnea index (AHI) was slightly higher in Home PSG (25.7 versus 23.5, p=0.04), but with excellent reliability, intra-class correlation coefficients of 0.96 (95% CI; 0.93-0.97), and good agreements (κ=0.59-0.70) between both tests. The sensitivity, specificity, and accuracy of Home PSG at cut-off point of AHI≥5, were 0.97, 0.56, and 0.85, respectively, and at AHI≥15 were 0.95, 0.76, and 0.85, respectively. Sixty-four patients (74.4%) preferred home-PSG but four patients (4.7%) needed repeated tests due to significant data loss. CONCLUSIONS: This is the first report in Asia demonstrating that home-based diagnosis of OSA by PSG type 2 was feasible performing with good reliability, high accuracy, and a low failure rate. However, further studies focusing on its cost-effectiveness are required.
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