TY - JOUR AU - Muza, Rexford AU - Lykouras, Dimosthenis AU - Rees, Kate PY - 2016 TI - The utility of a 5 th nap in multiple sleep latency test JF - Journal of Thoracic Disease; Vol 8, No 2 (February 01, 2016): Journal of Thoracic Disease [(dedicated to) the International Conference: Clinical Update Sleep 2016] Y2 - 2016 KW - N2 - Background: This is the first study that aimed to look specifically at the utility of the 5 th nap in the multiple sleep latency test (MSLT), a test used to assist in the diagnosis of narcolepsy. Methods: Data was retrospectively collected from the Sleep Disorders Centre of a Tertiary Hospital on patients that had a 5 th nap during their MSLT from the 08 th November 2011 to 12 th November 2014. Results: Fifty-three patients had a 5 th nap performed out of 378 MSLT studies. In 16% of cases a diagnosis of narcolepsy was given directly due to the inclusion of the 5 th nap on the MSLT. Here a 5 th nap allowed diagnostic criteria of mean sleep latency 2 SOREMPS to be met. In 53% of cases the mean sleep latency increased due to 5 th nap inclusion; the mean sleep latency of the first four naps was 5.6 vs. 6.7 after inclusion of the 5 th nap. Conclusions: The 5 th nap is not often performed within the MSLT studies. Our study shows that only a few patients may benefit from a 5 th nap opportunity which also led to increase of the mean sleep latency at the expense of extra time, cost, labour and increased patient anxiety. UR - https://jtd.amegroups.org/article/view/6331