Relationship between Daytime Sleepiness and Health Utility in Patients after Cardiac Surgery: A Preliminary Study

Kazuhiro P. Izawa, Yusuke Kasahara, Koji Hiraki, Yasuyuki Hirano, Koichiro Oka and Satoshi Watanabe
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Kazuhiro P. Izawa: Department of Public Health, Graduate School of Health Sciences, Kobe University, Kobe 654-0142, Japan
Yusuke Kasahara: Department of Rehabilitation Medicine, St. Marianna University School of Medicine Yokohama-City Seibu Hospital, Yokohama 241-0811, Japan
Koji Hiraki: Department of Rehabilitation Medicine, St. Marianna University School of Medicine Hospital, Kawasaki 216-8511, Japan
Yasuyuki Hirano: Department of Physical Therapy, Tokushima Bunri University, Tokushima 770-8514, Japan
Koichiro Oka: Faculty of Sport Sciences, Waseda University, Tokorozawa 359-1192, Japan
Satoshi Watanabe: Department of Rehabilitation Medicine, St. Marianna University School of Medicine Hospital, Kawasaki 216-8511, Japan

IJERPH, 2018, vol. 15, issue 12, 1-8

Abstract: Background Daytime sleepiness can be assessed by the Epworth Sleepiness Scale (ESS), which is widely used in the field of sleep medicine as a subjective measure of a patient’s sleepiness. Also, health utility assessed by the mean Short-Form Six-Dimension (SF-6D) score, one of several preference-based utility measures, is an important measure in health care. We aimed to examine age-related differences in daytime sleepiness and health utility and their relationship in patients 5 months after cardiac surgery. Methods ; This cross-sectional study assessed 51 consecutive cardiac surgery patients who were divided into a middle-aged (<65 years, n = 29) and older-age group (≥65 years, n = 22). The mean ESS and SF-6D utility scores were measured at 5 months after cardiac surgery and compared. In addition, the relationship between ESS and SF-6D utility scores were assessed. Results ; There were no significant differences between the middle-aged and older-aged groups in either the mean ESS (5.14 ± 2.96 vs. 4.05 ± 3.23, p = 0.22) or SF-6D utility (0.72 ± 0.14 vs. 0.71 ± 0.10, p = 0.76) scores. However, there was a negative correlation between both values in all of the patients after cardiac surgery ( r = −0.41, p = 0.003). Conclusions ; Although there were no age-related differences in the ESS and SF-6D utility values between the two groups, there was a negative correlation between these values in all patients at 5 months after cardiac surgery. This suggested that sleepiness is associated with decreased utility scores in patients at 5 months after cardiac surgery.

Keywords: age; Short-Form Six-Dimension; Epworth Sleepiness Scale; cardiac surgery (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2018
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