Abstract
We examined the apnea-hypopnea index (AHI) readings of 67 patients who demonstrated symptoms of sleep-disordered breathing as measured by both a portable monitor and polysomnography (PSG) between April 2011 and September 2015. There was a positive correlation between the AHI readings in severe SAS cases, but no correlation in the mild or moderate SAS cases. Although there was a correlation between the respective apnea index (AI) measurements, there was no correlation with respect to hypopnea index (HI) readings. Applying the classifications of AASM, there was a more significant correlation between AHI readings by PSG than by portable monitor for type 3 as compared to type 4. Even when the AHI readings of SAS cases are low using a portable monitor, we should consider use of PSG when patients have symptoms of excessive daytime sleepiness or complications such as cardiovascular disease or apoplexy.
