Correlation analysis between subjective and objective indexes of sleep quality in patients with liver cancer before surgery

Abstract

Objective To investigate the correlation between subjective and objective indexes of sleep quality in the patients with liver cancer before surgery. Methods Totally 78 patients with liver cancer in the First Affiliated Hospital of Xi′an Jiaotong University from October 2014 to March 2016 were selected as the research object by convenience sample method. The Pittsburgh sleep quality index (PSQI) and actigraphy were used to evaluate the subjective and objective indexes of sleep quality. Pearson correlation analysis was used to analyze the subjective and objective indexes of sleep quality. Results The PSQI total score of participants before surgery was (9.4±4.1) and 49 cases (62.8%) were subjectively poor sleepers. 29 cases were good sleepers, which accounted for 37.2%. The objective sleep time of patients was (401.0±113.4) min, the sleep efficiency was 81.0%, and the number of nocturnal awakenings was (3.5±2.1). Objective sleep onset latency was correlated with PSQI global score, subjective sleep quality, sleep latency, sleep efficiency, and daytime dysfunction (r=0.23, 0.26, 0.22, 0.20, 0.24; P 0.05). Conclusions PSQI and the subjective and objective indexes of sleep quality all showed that, patients with liver cancer have poor sleep before surgery, but the correlation between subjective index and objective index is low, and the dimensions to evaluate the subjective and objective indexes are not in accordance. It is important to evaluate the sleep of patients with liver cancer by combining the subjective and objective indexes together. Key words: Hepatoma; Sleep initiation and maintenance disorders; Pittsburgh sleep quality index; Actigraphy; Correlation analysis