Nocturnal desaturation in the stroke unit is associated with wake-up ischemic stroke

Tae Jung Kim, Sang Bae Ko, Han Gil Jeong, Ji Sung Lee, Chi Kyung Kim, Yerim Kim, Kiwoong Nam, Heejung Mo, Sang Joon An, Huimahn Alex Choi, Byung Woo Yoon

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Background and Purpose - Wake-up stroke (WUS) represents a quarter of all ischemic strokes and may be a specific subgroup. Nocturnal desaturation secondary to sleep-disordered breathing is an independent risk factor for stroke, but the association between nocturnal desaturation and WUS remains unclear. We investigated the relationship between nocturnal desaturation using oxygen desaturation index and WUS in patients with acute stroke in the stroke unit. Methods - A total of 298 patients admitted for acute ischemic stroke to the stroke unit between July 2013 and May 2015 were enrolled. The oxygen desaturation index was calculated using pulse oximetry data sampled every 1 minute during 9 hours on the first night (10:00 pm-7:00 am) of the stroke unit admission, and nocturnal desaturation was defined as an oxygen desaturation index of 5 at least per hour. We compared the clinical characteristics and nocturnal desaturations between patients with and without WUS. Results - Among all patients (age, 67.7±12.6 years; male, 54.4%), 26.5% patients had WUS. The proportion of nocturnal desaturation was significantly greater in patients admitted with WUS (29.1% versus 12.3%, P=0.001). The age, sex, risk factors except for hyperlipidemia, stroke severity, and stroke mechanisms were similar between the 2 groups. After adjustment for covariates, it was found that nocturnal desaturation was significantly more common in the WUS group (odds ratio, 3.25; 95% confidence interval, 1.63-6.46). Conclusions - Nocturnal desaturation was more frequently observed in patients admitted with WUS during the first night in the stroke unit. This suggests that nocturnal desaturation is a possible modifiable risk factor for the occurrence of WUS.

Original languageEnglish
Pages (from-to)1748-1753
Number of pages6
Issue number7
Publication statusPublished - 2016 Jul 1

Bibliographical note

Funding Information:
This study was supported, in part, by the Seoul National University Research Fund (0420120950) and, in part, by National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (NRF-2013M3A9B2076531).

Publisher Copyright:
© 2016 American Heart Association, Inc.


  • pulse oximetry
  • risk factor
  • sleep-disordered breathing
  • stroke

ASJC Scopus subject areas

  • Clinical Neurology
  • Cardiology and Cardiovascular Medicine
  • Advanced and Specialised Nursing


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