Effect of inhalation aromatherapy on physical and psychological problems in cancer patients: Systematic review and Meta-analysis

Effects of aromatherapy on quality of life and pain in patients with cancer: A meta-analysis

CONTEXT

. Cancer has become a chronic disease to which new therapeutic approaches are being applied and many patients are interested in the long-term consequences of these approaches. Aromatherapy is one approach that has been used as a safe and comfortable method to alleviate symptoms in patients with cancer, and its effects on various aspects of life have been reported.

OBJECTIVES

. A systematic review and meta-analysis were conducted to examine the effects of aromatherapy on quality of life (QoL) and pain in patients with cancer.

METHODS

. Using a comprehensive search strategy, 11 databases were searched from their inception to July 2023 for randomized controlled trials. In the meta-analysis, the standardized mean difference and 95% confidence interval were calculated as effect measures by applying a random effects model.

RESULTS

. Fifteen studies met the inclusion criteria. Aromatherapy was found to have favorable effects in improving QoL (Hedges' ĝ = 0.62, 95% CI: 0.24 to 1.00), but no statistically significant effect of aromatherapy on pain was found (Hedges' ĝ = -0.46, 95% CI: -0.99 to 0.07).

CONCLUSION

The findings indicate statistically significant improvements in QoL when combining aromatherapy and massage, but it was not possible to disentangle the individual effects of each. Considering the characteristics of cancer patients, aromatherapy has beneficial effects as a non-pharmacological method. Further research is needed to investigate the effect of aromatherapy on symptom management, considering factors such as the duration of cancer development and type of cancer.

Effects of aromatherapy on nausea and vomiting in patients with cancer: A systematic review and meta-analysis of randomized controlled trials

BACKGROUND

and purpose: Aromatherapy offers a low-risk solution for effectively managing common nausea and vomiting in cancer patients. This systematic review and meta-analysis aimed to assess its impact on these symptoms to facilitate practical guidelines establishment.

METHODS

PubMed, Web of Science, Cochrane Library, MEDLINE, CINAHL, and Embase were searched for articles published until April 30, 2023. Inclusion criteria were randomized controlled trials (RCTs) on the effect of aromatherapy on nausea and vomiting in patients with cancer (age ≥18 years). The effect size was calculated using standardized mean differences (SMDs) with a random effects model. Subgroup analyses, meta-analysis of variance, and meta-regression were performed using the "meta" package in R version 4.0.2. Heterogeneity was assessed using I2 statistics. Sensitivity and publication bias analyses were performed; two reviewers independently assessed risk of bias using Cochrane's risk-of-bias tool 2.0.

RESULTS

Twenty-five RCTs across 10 articles revealed that aromatherapy reduced overall nausea and vomiting in patients with cancer with significant efficacy (SMD = -0.81, 95 % confidence interval [CI]: -1.11 to -0.52). Furthermore, aromatherapy reduced nausea (SMD = -0.85, 95 % CI: -1.23 to -0.46) and combined nausea and vomiting (SMD = -1.08, 95 % CI: -1.68 to -0.47), but not vomiting alone (SMD = -0.24, 95 % CI: -1.03 to 0.55). Inhalation and massage yielded positive results, especially in chemotherapy-induced cases; peppermint oil was particularly successful.

CONCLUSION

Our findings underscore aromatherapy's value in managing cancer treatment-associated nausea and vomiting. Conclusive evidence on aromatherapy-led nausea reduction is lacking due to limited RCTs; research is warranted for robust conclusions.

Effects of Aromatherapy on Physical and Mental Health of Cancer Patients Undergoing Radiotherapy and/or Chemotherapy: A Meta-Analysis

BACKGROUP

Currently, aromatherapy is being increasingly utilized in clinical practice, particularly in managing the side effects associated with radiotherapy and chemoradiotherapy. However, it remains to be established whether aromatherapy can effectively alleviate these symptoms.

OBJECTIVE

To investigate the effects of aromatherapy on the physical and mental health of patients with cancer undergoing radiotherapy and chemotherapy.

METHODS

Seven databases were researched from inception until September 29, 2023, including PubMed, Scopus, and Web of Science, Chinese National Knowledge Infrastructure, Wanfang database, China Biology Medicine disc and VIP Chinese Medical Journal Database. Review Manager version 5.3 was utilized for data analysis. The Cochrane Risk of Bias tool RoB2 was employed to evaluate the quality of the literature included in the study. Evidence quality rating was assessed using the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) approach through the GRADEpro GDT online tool.

RESULTS

Nineteen studies involving 1,541 patients were included. Aromatherapy can alleviate nausea [relative risk (RR)=0.64, 95% confidence interval (CI): 0.53 to 0.78, P<0.05, I2=46%; standardized mean difference (SMD)=-0.86, 95% CI: -1.21 to -0.51, P<0.05, I2=64%] and vomiting (RR=0.54, 95% CI: 0.42 to 0.69, P<0.05, I2=35%; SMD=-1.28, 95% CI: -1.52 to -1.03, P<0.05, I2=92%), improve sleep disorders [mean difference (MD)=-3.39, 95% CI: -3.95 to -2.84, P<0.05, I2=0%], relieve pain (SMD=-1.58, 95% CI: -1.96 to -1.21, P<0.05, I2=0%), mitigate fatigue (SMD=-1.28, 95% CI: -2.44 to -0.11, P<0.05, I2=93%) and enhance quality of life (SMD=0.50, 95% CI: 0.22 to 0.79, P<0.05, I2=0%) in cancer patients after radiotherapy and chemotherapy, but it may not have a significant effect on anxiety. The risk of bias was high in the included studies using the Cochrane Risk of Bias tool RoB2, and no studies were considered to be of high grade according to the GRADE system.

CONCLUSIONS

Aromatherapy is an efficacious, safe and economic adjunctive therapy for cancer patients, which can mend the physical symptoms and mental health of cancer patients. However, more high-quality studies are needed to verify it. (PROSPERO registration No. CRD42023390171).

2023 MASCC/ESMO consensus antiemetic guidelines related to integrative and non-pharmacological therapies

PURPOSE

Review the literature to propose suggestions or recommendations for controlling nausea and vomiting through integrative and non-pharmacological treatments for the MASCC/ESMO 2023 update of its antiemetic guidelines.

METHODS

The authors identified available systematic reviews and/or meta-analyses for 12 integrative therapies, including acupressure, acupuncture, auricular therapy, electrical stimulation of point PC6, ginger use (i.e., Zingiber officinale), guided imagery, hypnosis, inhalation aromatherapy, music therapy, food-based interventions, progressive muscle relaxation, and reflexology. Reviews were assessed for quality through the AMSTAR2 tool. A consensus committee reviewed recommendations as per MASCC/ESMO established processes.

RESULTS

Thirty-nine systematic reviews and/or meta-analyses were used. There were major methodological flaws for many of the trials used as the bases for the reviews. No recommendation for ingested ginger could be made because of conflicting evidence. Recommendations were possible for acupuncture/electroacupuncture treatments, food-based interventions, and progressive muscle relaxation training alone or combined with guided imagery. No recommendations could be reached for a number of food-based approaches, inhalation aromatherapy, hypnosis in adults, music therapy, and reflexology.

CONCLUSION

While a limited number of suggestions are provided, there is a need for significantly higher quality trials in many of the therapeutic approaches assessed, before stronger recommendations and a wider range of approaches are made.

Effects of Aromatherapy on Cancer Patients' Sleep and Fatigue: A Systematic Review and Meta-Analysis

Objective: This study aims at investigating the effectiveness of aromatherapy in enhancing sleep quality and reducing fatigue among cancer patients based on randomized controlled trials (RCTs) with a high level of evidence. Design: A systematic review and meta-analysis. Methods: Two reviewers screened and reviewed the full texts of search results obtained from six English databases and four Korean databases, and they extracted data from the selected studies independently. Risk of bias (RoB) was assessed using the revised Cochrane RoB tool for randomized trials. The review protocol was registered with the International Prospective Register of Systematic Reviews (CRD42021277515). Results: Eleven RCTs were included in this study. Aromatherapy significantly improved sleep quality among cancer patients compared with those in the control groups (routine care, no intervention, and placebo) (standardized mean difference [SMD] = -0.92, 95% confidence interval [CI]: -1.39 to -0.46; p < 0.001, I² = 89%). However, aromatherapy did not significantly reduce fatigue among such patients (SMD = -0.40, 95% CI: -0.81 to 0.01). The results of the meta-regression confirmed that increased intervention sessions resulted in the enhanced effectiveness of aromatherapy in improving sleep quality among cancer patients (Z = -3.86, p < 0.001). Conclusion: This study showed that aromatherapy significantly improves sleep quality among cancer patients. However, aromatherapy does not significantly reduce fatigue among cancer patients. It is possible that the statistical power of the meta-analysis was weak due to the small number of included studies. Therefore, in future studies, the effects of aromatherapy on fatigue among cancer patients should be assessed further using a larger number of included studies. Further, the effects of aromatherapy should be evaluated with a focus on specific subsets of patients, such as specific cancer diagnoses and specific modalities for cancer treatment.