End-stage renal disease (ESRD) is the final stage of chronic kidney disease progression. Due to the limited availability of kidneys and economic reasons, 90% of patients with ESRD choose maintenance hemodialysis for treatment[1]. Statistics indicate that the global number of individuals undergoing maintenance hemodialysis approached 3 million in 2017[2]. As of the end of 2022, the China National Renal Data System (CNDRS) reported that the number of patients on maintenance hemodialysis had increased to over 844,000, with a continuing upward trend each year[1]. Maintenance hemodialysis effectively substitutes some of the kidney’s functions by removing metabolic waste and excess bodily fluids. However, due to the high frequency and long duration of dialysis cycles, patients on maintenance hemodialysis often face psychological and sleep issues, resulting in increased negative emotions and decreased positive emotions. Evidence indicates that the prevalence of depression and anxiety in patients on maintenance hemodialysis reaches 55% and 50%, respectively[3], with 64% experiencing varying degrees of sleep disorders[4]. Studies have shown that anxiety and depression reduce patients' adherence to dialysis[5], as well as causing a variety of symptoms such as decreased appetite[6], fatigue[7], reduced sleep quality[8], and other symptoms of distress, which affect patients' quality of life and are even associated with an increase in mortality[9].
In the treatment of depression and anxiety in patients on maintenance hemodialysis, there is a significant gap in care[10], compounded by the potential side effects of current antidepressant medications. Selective serotonin reuptake inhibitors are commonly prescribed, but studies indicate that these medications may cause nausea, vomiting, and even elevate the risk of bleeding[11] and hip fractures[12]. Another antidepressant, sertraline, has a high rate of adverse events, leading to increased discontinuation, and its efficacy in alleviating depressive symptoms does not significantly differ from that of a placebo[13]. Other antidepressants, such as serotonin regulators, tricyclics, and tetracyclics, may cause arrhythmias and orthostatic hypotension[11]. Currently, there is insufficient scientific evidence regarding the efficacy and safety of antidepressants for treating depression and anxiety in patients on hemodialysis[14]. Furthermore, research[15] indicates that the use of hypnotics increases the risk of adverse reactions in patients on hemodialysis. Given these challenges, identifying a safe, non-pharmacological therapy without side effects is essential. Music therapy, a form of complementary and alternative medicine, has been shown to be beneficial for patients with various chronic and advanced diseases, effectively utilizing patients' free time during dialysis sessions[11]. This intervention is widely accepted by patients and has a low dropout rate. Research[16] has demonstrated that music therapy can serve as an effective nursing intervention, improving the quality of life for hemodialysis patients by alleviating anxiety and depression.
Music therapy leverages music to regulate patients' physical and psychological health[17]. Western music therapy and five-element music therapy have become key areas of research, showing promising positive impacts on emotional well-being and physiological function. Western music utilizes a seven-note scale, predominantly categorized into major and minor modes. Major modes typically evoke positive emotional experiences, such as happiness, while minor modes tend to elicit negative emotions like sadness, fear, and anger. Western music therapy utilizes these different modes to stimulate and modulate patients' emotions[18]. Five-element music therapy originates from the ancient Chinese text "The Yellow Emperor's Canon of Internal Medicine"[19], which states, "There are five tones in heaven and five organs in human". The five tones are "Gong, Shang, Jue, Zhi, and Yu", corresponding to the five organs of "spleen, lung, liver, heart and kidney". According to this theory, aligning music's varied tones with the respective organs can enhance organ function and promote the balance of qi and blood, thereby aiding in the restoration of health[20]. Five-element music therapy has extensive applications in Traditional Chinese Medicine (TCM), including treating various diseases and regulating emotions. In recent years, with increased attention to physical and mental health, five-element music therapy has been increasingly integrated into modern medicine as a complementary treatment modality. Although research indicates that five-element music can alleviate depression symptoms, its effect on anxiety is a topic of debate. Jiang et al.[21] reported the effectiveness of five-element music in reducing anxiety in patients with lung cancer. However, Yang et al.[22] suggested that the impact of five-element music might be less significant compared with conventional treatments for patients with cancer. This discrepancy underscores the need for research to clarify the effect of five-element music therapy on anxiety reduction.
Music is a phenomenon that exists in all human cultures. Through its acoustic and physical properties, music elicits emotional responses in listeners[23, 24]. This indicates that the influence of tonal patterns on emotional arousal is culturally universal. However, there are cultural differences in how individuals from different backgrounds perceive and respond to music, particularly in terms of their emotional and physiological reactions[25]. Research[26] indicates that individuals are better able to categorize music from their own culture compared to music from other cultures, supporting the cultural distance hypothesis. Interestingly, a similar pattern emerges when comparing the effects of five-element music and Western music on emotional well-being. The debate over the comparative effectiveness of five-element and Western music remains unresolved, with limited randomized controlled trials comparing their applications. Liao et al.[27] explored the effects of five-element music and Western music on negative emotions such as depression and anxiety among participants from Canada and China. The results showed that only the group exposed to five-element music experienced significant reductions in anxiety and depression scores, especially among Chinese participants. Notably, the investigators targeted individuals who had mild depression symptoms and suboptimal health, and the study group differed from the maintenance hemodialysis group in several ways, including disease characteristics and severity of illness.
Currently, research is insufficient to compare the effects of the two types of music in patients on maintenance hemodialysis. Based on these findings, we designed a randomized controlled trial to investigate the psychological and physiological impacts of these two culturally distinct music therapies and compare them with a control group, providing more diverse and personalized adjunctive treatment options for clinical practice. Because five-element music reflects Chinese culture, we hypothesized that five-element music would offer superior benefits in improving the emotion, sleep quality and symptom burden of patients on maintenance hemodialysis compared with Western music therapy; in addition, we expected both approaches to be more beneficial than the control group. The following is a summary of our study and design.