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Volume 10, Issue 4 (3-2021)                   cmja 2021, 10(4): 308-327 | Back to browse issues page


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Pourmohammadi M, Tagharrobi Z, Sharifi K, Sooki Z, Zare Joshaghani F. Effect of Auriculotherapy on Sleep Quality in Elderly With Chronic Low Back Pain: A Single-blind Randomized Clinical Trial. cmja 2021; 10 (4) :308-327
URL: http://cmja.arakmu.ac.ir/article-1-767-en.html
1- Trauma Nursing Research Center, Faculty of Nursing and Midwifery, Kashan University of Medical Sciences, Kashan, Iran.
2- Trauma Nursing Research Center, Faculty of Nursing and Midwifery, Kashan University of Medical Sciences, Kashan, Iran. , tagharrobi_z@yahoo.com
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1. Introduction

ne of the most common forms of chronic pain in the elderly is low back pain [24], which in many cases is associated with sleep disorders [6] and can endanger the physical and mental health of the sufferer [2, 7-9]. In recent years, non-pharmacological methods [14-17] have been increasingly considered by researchers and health professionals to treat chronic low back pain and its secondary problems. Among these non-pharmacological methods introduced to reduce pain, auriculotherapy or ear acupressure is effective in balancing hormone levels and increasing the release of neurotransmitters such as serotonin. It also improves blood circulation and brain function and induces deep relaxation [18]. In some studies, its effect on inflammatory processes has been proven; it has been reported that it can increase anti-inflammatory compounds [19, 20]. Therefore, it is expected that these mechanisms may be effective in reducing pain intensity and sleep disorders in patients with chronic low back pain. Some studies have shown that auriculotherapy reduces the severity of low back pain and improves sleep quality [21, 27]. However, not all previous studies indicate its positive effects in patients with chronic pain [19-23]. In addition, these studies face some limitations and disadvantages in terms of methodology or perspective on how to address the issue of pain [9, 19-27, 30]. On the other hand, in most related studies, the cognitive status of the elderly and behavioral manifestations of pain such as changes in sleep quality have not been considered [11, 20], while they are very important for the elderly people. In this regard, the present study aims to investigate the effect of auriculotherapy on the sleep quality of the elderly with chronic low back pain.

2. Methods and Materials

The present study is a single-blind clinical trial conducted in 2019 on the elderly aged ≥60 years with chronic low back pain in Kashan, Iran, divided randomly into two intervention and sham groups using the block randomization method. They were selected based on the inclusion criteria and the scores of Cognitive State Test (COST) and Visual analogue Scale (VAS). In the intervention group, auriculotherapy was performed for 4 weeks, 5 days a week, 3 times per day during having pain. In this group, Vaccaria seeds were applied on the shenmen, sympathetic, subcortex and low back points of the ear [11] and the elderly were instructed to press these seeds with their index and middle fingers for three minutes at a an scheduled time (Figure 1).



In the sham group, auriculotherapy was also applied with similar instructions but on the kidney, stomach, mouth and duodenum points [11] (Figure 2).



In both groups, during the 4 weeks of the intervention, Vaccaria seeds were alternately applied to both ears every other week. Seeds were placed on the ear for 5 days each week, and subjects were told to separate them at the end of the 5th day. During the intervention period, each week, subjects were visited and their pain intensity was assessed with the short form of McGill Pain Questionnaire (MPQ) and new seeds were attached to their ears. If the mean number and duration of pressures on the seeds were at least 2 times a day and 2 minutes each time, the sample would be remained in the study. Application of seeds was continued for 4 weeks and subjects were followed up for 4 weeks after the intervention. MPQ and Pittsburgh Sleep Quality Index (PSQI) were completed at the beginning of the study and at the end of the first, second, third and fourth weeks of the study as well as 4 weeks after the intervention (follow-up period). Data analysis was performed in SPSS V.16 software using repeated measures ANOVA and ANCOVA. Data were analyzed in two stages: in the first stage based on a Per-Protocol (PP) approach and in the second stage based on an Intention-to-Treat (ITT) approach. Six patients from the Sham group and 2 patients from the intervention group did not complete the study.

3. Results

There was a statistically significant difference between the intervention and sham groups in terms of duration of disease at baseline. In PP approach, the interaction effect of time and group on low back pain intensity score was reported to be significant by controlling the confounding effect of the duration of disease (F=270.17, P<0.0001). In the intervention group, the effect of time on the low back pain intensity was significant (P<0.0001), but it effect in the sham group was not significant (P=0.17). After removing the confounding effect of the duration of disease, ANCOVA results showed that at the beginning of the study, the first week and the second week, the difference between the two groups was not significant in terms of low back pain intensity, but in other time periods, the difference between the two groups was significant (P<0.0001). The interaction effect of time and group on the sleep quality score was also significant by controlling the confounding effect of the duration of disease (F=141.87, P<0.0001) (Figure 3).



The effect of time on the sleep quality was also significant in the intervention group (P<0.0001), but not in the sham group (P= 0.21). ANCOVA results showed that at the beginning of the study, the difference between the two groups was not significant in terms of sleep quality, but the difference between the two groups was significant in other time periods (P<0.0001) (Table 1). In ITT approach, the results were similar to the results reported In PP analysis stage.


 

4. Conclusion 

The present study revealed the positive effects of auriculotherapy on reducing the severity of low back pain in the elderly with chronic low back pain under ITT and PP analysis. The findings of our study are consistent with the results of some previous studies [11, 20] and are against the findings of some other [19, 28]. This discrepancy, regardless of differences in the target group or their characteristics, may be related to insufficient sample size in the mentioned studies. The positive role of auriculotherapy in reduction of pain intensity can be explained by the effect of this treatment on Qi flow, improving blood flow, and the production of endorphins [11] and hormones such as cortisol and serotonin [20].
In the present study, both PP and ITT analyses showed a positive effect of auriculotherapy on improving sleep quality in the elderly with chronic low back pain. This finding confirms the findings of other researchers [6, 29, 38] but is not in line with the findings of Yeh et al. [39]. Due to the two-way relationship between pain and sleep disorders, it is expected that auriculotherapy can also improve sleep quality by raising the level of pain threshold [32, 34], in addition to inducing muscle relaxation following Qi circulation, improving blood flow in the meridians [18], and increasing serotonin production [41].
Although performing ITT analysis and obtaining findings similar to PP analysis support the validity of the results, we should be somewhat cautious about generalizations of the results due to insufficient blinding, the use of younger elderly, and the fact that most of them were female. It is suggested that further study be conducted with a double-blind design, a larger sample size, and data analysis based on gender and age.

Ethical Considerations

Compliance with ethical guidelines

The research proposal was approved by the Vice Chancellor for Research and Technology and the Ethics Committee of Kashan University of Medical Sciences (Code: IR.KAUMS.NUHEPM.REC.1397.064). The design was registered on the clinical trial site (Code: IRCT20190303042891N1). 
The participants were informed of the purpose of the research and its implementation stages. A written consent has been obtained from the subjects. They were also assured about the confidentiality of their information and were free to leave the study whenever they wished, and if desired, the research results would be available to them. 

Funding

This study was extracted from MA. thesis of first author at Trauma Nursing Research Center, Faculty of Nursing and Midwifery, Kashan University of Medical Sciences, Kashan. It received financial support from the Deputy for Research and Technology of Kashan University of Medical Sciences (Grant Number: 97207).

Authors' contributions

Conceptualization and supervision: Zahra Tagharrobi, khadigeh Sharifi, Zahra Sooki; Methodology: Zahra Tagharrobi, Maryam Pourmohammadi, Fatemeh Zare-Joshaghani; Investigation, writing – original draft, and writing – review & editing: Zahra Tagharrobi, Khadigeh Sharifi, Zahra Sooki, Maryam Pourmohammadi; Data collection: Maryam Pourmohammadi; Data analysis: Zahra Tagharrobi, khadigeh Sharifi, Zahra Sooki; Funding acquisition and Resources: All authors.

Conflicts of interest

The authors declares no conflict of interest

Acknowledgements

The authors would like to thank the staff of comprehensive health centers of Golabchi and Taleghani, the Deputy for Research and Technology of Kashan University of Medical Sciences, and all participants.

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Type of Study: Research | Subject: Traditional medicine

References
1. Nahin RL. Severe Pain in Veterans: The Effect of Age and Sex, and Comparisons With the General Population. J Pain. 2017;18(3): 247-54. [DOI:10.1016/j.jpain.2016.10.021] [PMID] [PMCID]
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3. Leopoldino AAO, Diz JBM, Martins VT, Henschke N, Pereira LSM, Dias RC, et al. Prevalence of low back pain in older Brazilians: a systematic review with meta-analysis. Rev Bras Reumatol. 2016; 56(3): 258-69. [DOI:10.1016/j.rbr.2016.01.004]
4. Waterman BR, Belmont PJJ, Schoenfeld AJ. Low back pain in the United States: incidence and risk factors for presentation in the emergency setting. Spine J. 2012; 12(1): 63-70. [DOI:10.1016/j.spinee.2011.09.002] [PMID]
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