The Effect of Ginger Extract on the Incidence and Severity of Nausea and Vomiting After Cesarean Section Under Spinal Anesthesia

Nonpharmacological Nursing Interventions in Postoperative Nausea and Vomiting: A Systematic Review

PURPOSE

This study aims to assess the impact of nonpharmacological nursing interventions on postoperative nausea and vomiting (PONV).

DESIGN

This is a systematic review.

METHODS

MEDLINE, Web of Science, ScienceDirect, Tübitak-ULAKBİM, and TRDizin databases were searched for the following search terms, including "Postoperative Nausea and Vomiting," "Nurse," "Nursing," and "Nonpharmacological Interventions" to identify nonpharmacological nursing interventions for PONV. A systematic review of English and Turkish articles published in the period between January 1, 2012 and June 1, 2023 was conducted. The PICOT-SD method was used to determine the compatibility of the pieces with the eligibility criteria.

FINDINGS

Fifty-eight of 3,874 articles obtained from databases fulfilled the eligibility criteria. This study demonstrated that acupuncture, aromatherapy, the oral intake of ginger, listening to music, education, and visits to patients decreased the incidence of nausea and vomiting and increased the quality of life. Additionally, it was found that patients' quality of life tended to improve along with reductions in postoperative complications.

CONCLUSIONS

The results of this study support previous findings in the literature and demonstrate that nonpharmacological nursing interventions help reduce and prevent PONV. Based on our results, we suggest that nonpharmacological nursing interventions can be employed for the management of PONV in patients undergoing surgery.

Using Ginger Oil to Treat Nausea and Vomiting Following Breast Augmentation Surgery

We conducted a double-blind, randomized, placebo-controlled, single-center study involving 30 women undergoing breast augmentation surgery with silicone breast implants. All patients had an A cup breast size and a similar body mass index. We placed the same type of implant in a subpectoral dual plane in each patient. We randomly allocated the study participants to receive either three drops of ginger oil (110 mg Zingiber officinale) or three drops of a placebo control oil placed on their laryngeal mask before insertion. We used a postoperative nausea and vomiting (PONV) and a visual analog scale (VAS) scores as outcome measures and compared the scale results with the dose of morphine used by the patient. The results of the multivariate analysis of variance showed that the ginger oil had a significant effect on PONV/VAS scores, V = 0.87, F(3, 16) = 34.78, p < .001. The results of the univariate analysis of variance showed that using the ginger oil provided significant treatment effects on PONV, F(1, 18) = 73.05, p < .001. These results are also reflected in the descriptive statistics. The mean PONV score for the experimental group and the control group was 1.70 ± 0.48 and 4.20 ± 0.79, respectively. The mean VAS score for the experimental group and the control group was 5.0 ± 1.63 and 5.9 ± 2.33, respectively. The results of our study showed that ginger oil has an important role in preventing PONV and reducing the use of postoperative opioids in women who have undergone breast augmentation surgery.

The Effect of Auriculotherapy on Nausea, Vomiting, and Anxiety in Patients Undergoing Elective Cesarean Section with Spinal Anesthesia: A Clinical Trial Study

Background

Nausea, vomiting, and anxiety are common complications during and after spinal anesthesia. Auriculotherapy as a complementary medicine can be useful for reducing nausea, vomiting, or anxiety. This study was performed to evaluate the effects of auriculotherapy on nausea, vomiting, and anxiety in patients undergoing elective Cesarean Section (CS) with spinal anesthesia.

Materials and Methods

The present study was a clinical trial study that was performed on 56 pregnant women selected as CS candidates in Ommolbanin Hospital in Mashhad during the years 2016-2017. In the intervention group, 1 h before spinal anesthesia, auricular acupoint stimulation was performed at four points bilaterally, for 20-30 seconds at each point. Evaluations were done by the following questionnaires: State-Trait Anxiety Inventory (STAI), Visual Analog Scale (VAS), and Vomiting Assessment Form.

Results

The mean anxiety (SD) before the intervention in the intervention group and the control group was 47.88 (8.67) and 47.84 (10.49), respectively, and 4 h after the intervention, it was 40.23 (10.19) and 42.88 (12.18) in the intervention and control groups, respectively. These results were significant in the intervention group (p = 0.008). 30-40 min before and 4 h after the surgery, the severity of nausea and vomiting was low in both groups and no significant difference was observed between the two groups during the surgery and in the recovery room (p > 0.05).

Conclusions

According to the results, auriculotherapy could reduce anxiety in CS patients with spinal analgesia. The results also showed that auriculotherapy reduced the severity of nausea and vomiting, but these changes were not significant.

The Effect of Ginger on Postoperative Nausea and Vomiting Among Patients Undergoing Upper and Lower Limb Surgery: A Randomized Controlled Trial

PURPOSE

Postoperative nausea and vomiting is one of the most common side effects associated with anesthesia. The aim of this study is to determine the effect of ginger on severity and incidence of nausea and vomiting after lower and upper limb surgery.

DESIGN

This was a triple-blinded clinical trial.

METHODS

Sixty eligible patients were randomly assigned to the intervention and control groups. The intervention group received four 250 mg ginger capsules and the control group received four placebo capsules 2 hours before surgery. Incidence and severity of nausea and vomiting immediately after the surgery and 2, 4, 6, and 8 hours after the surgery were evaluated.

FINDINGS

The results of this study showed that the use of ginger capsules significantly reduces the incidence and severity of postoperative nausea and vomiting at different hours after surgery compared to placebo, P < .05, irrespective of the gender and the age of the patients.

CONCLUSIONS

Use of ginger is effective in decreasing postoperative nausea and vomiting. However, further studies in comorbid patients are required to verify these outcomes.

The Effect of Aromatherapy Administration in the Decrease of Nausea in Post-Spinal Anesthesia Patients

Objective: This study aims to know the effect of aromatherapy on reducing nausea in post spinal anesthesia patients. Method: This research is a literature study. In the strategy to find the journal framework used is PICOT. The keywords used are "Aromatherapy and nausea and vomiting and postoperative and spinal anesthesia". The data sources used are e-resources from PubMed and Google Scholar in the form of articles or journals. The inclusion criteria in this study were national and international journals from different databases and related to research variables, namely nausea, with aromatherapy inhalation intervention, as well as articles discussing the effects of inhaled aromatherapy on nausea in postoperative patients with spinal anesthesia. Deadline for publication of articles within the last 5 years (2016-2021). The exclusion criteria for this study were national and international databases and had nothing to do with the study variables, no intervention was given, there was no reflexology effect on anxiety levels in burn patients and the publication time of the article was more than 5 years. Results: In searching for articles using 2 databases, each was found from PubMed 1871 search results and Google Scholar 951 search results. After disqualification related to the year of publication, 485 articles were obtained in the last 5 years, and in the end 8 articles were obtained that matched the criteria obtained. Of the 8 articles that have been reviewed, it was found that postoperative patients with spinal anesthesia experienced nausea Conclusion: Based on a systematic review conducted on 8 articles, it can be concluded that the administration of aromatherapy is very useful for reducing nausea in postoperative patients with spinal anesthesia. There are many choices of aromatherapy that can be given to patients, ranging from lavender aromatherapy, ginger aromatherapy, peppermint aromatherapy, lemon essential oil aromatherapy and rose aromatherapy. So it is suggested that aromatherapy inhalation intervention can be applied to patients who experience postoperative nausea with spinal anesthesia.

Prevention and management of postoperative nausea and vomiting after cesarean section: A systematic literature review

Introduction

Post-operative nausea and vomiting (PONV) are a common post-operative problem in anesthesia. The incidence of PONV in patients undergoing cesarean sections is very high. Post-operative nausea and vomiting have many negative impacts on the patient, baby, family, and health care system. Therefore, appropriate evidence-based knowledge regarding the prevention and management of PONV for those high-risk patients is a timely and very important issue to address to decrease the associated complications.

Methods

A comprehensive literature search was conducted in Pubmed/Medline, Cochrane reviews, and google scholar including those studies published in the English language from 2010 up to 2021. The methodological quality of the included studies was appraised by the Cochrane risk of a biased assessment tool for intervention and non-interventional studies.

Result

The search strategy identified a total of 10,540 articles from different electronic databases. 33 articles were selected for screening after duplicates were removed; finally, 17 articles were included for critical appraisal and 16 articles were excluded with reasons. The included articles consist of 15 RCT, 1 non-control prospective cohort, and 1 cross-sectional study.

Conclusion

Pieces of evidence revealed that all obstetrics patients undergoing cesarean section should be given multimodal PONV prophylaxis. It is shown that a multimodal approach by a combination of different antiemetic agents should be preferred and most effective in preventing intraoperative and postoperative nausea and vomiting for patients undergoing cesarean section because of the complex pathophysiology of nausea and vomiting.

•

What are PONV prevention strategies for C/S?

•

What are the treatment approaches for PONV after C/S?

•

Which one is best option for the prevention of PONV after C/S?

Interventions for preventing nausea and vomiting in women undergoing regional anaesthesia for caesarean section

BACKGROUND

Nausea and vomiting are distressing symptoms which are experienced commonly during caesarean section under regional anaesthesia and in the postoperative period.  OBJECTIVES: To assess the efficacy of pharmacological and non-pharmacological interventions versus placebo or no intervention given prophylactically to prevent nausea and vomiting in women undergoing regional anaesthesia for caesarean section.

SEARCH METHODS

For this update, we searched Cochrane Pregnancy and Childbirth's Trials Register, ClinicalTrials.gov and the WHO International Clinical Trials Registry Platform (ICTRP) (16 April 2020), and reference lists of retrieved studies.

SELECTION CRITERIA

We included randomised controlled trials (RCTs) of studies and conference abstracts, and excluded quasi-RCTs and cross-over studies.

DATA COLLECTION AND ANALYSIS

Review authors independently assessed the studies for inclusion, assessed risk of bias and carried out data extraction. Our primary outcomes are intraoperative and postoperative nausea and vomiting. Data entry was checked. Two review authors independently assessed the certainty of the evidence using the GRADE approach.

MAIN RESULTS

Eighty-four studies (involving 10,990 women) met our inclusion criteria. Sixty-nine studies, involving 8928 women, contributed data. Most studies involved women undergoing elective caesarean section. Many studies were small with unclear risk of bias and sometimes few events. The overall certainty of the evidence assessed using GRADE was moderate to very low. 5-HT3 antagonists: We found intraoperative nausea may be reduced by 5-HT3 antagonists (average risk ratio (aRR) 0.55, 95% confidence interval (CI) 0.42 to 0.71, 12 studies, 1419 women, low-certainty evidence). There may be a reduction in intraoperative vomiting but the evidence is very uncertain (aRR 0.46, 95% CI 0.29 to 0.73, 11 studies, 1414 women, very low-certainty evidence). There is probably a reduction in postoperative nausea (aRR 0.40, 95% CI 0.30 to 0.54, 10 studies, 1340 women, moderate-certainty evidence), and these drugs may show a reduction in postoperative vomiting (aRR 0.47, 95% CI 0.31 to 0.69, 10 studies, 1450 women, low-certainty evidence). Dopamine antagonists: We found dopamine antagonists may reduce intraoperative nausea but the evidence is very uncertain (aRR 0.38, 95% CI 0.27 to 0.52, 15 studies, 1180 women, very low-certainty evidence). Dopamine antagonists may reduce intraoperative vomiting (aRR 0.41, 95% CI 0.28 to 0.60, 12 studies, 942 women, low-certainty evidence) and postoperative nausea (aRR 0.61, 95% CI 0.48 to 0.79, 7 studies, 601 women, low-certainty evidence). We are uncertain if dopamine antagonists reduce postoperative vomiting (aRR 0.63, 95% CI 0.44 to 0.92, 9 studies, 860 women, very low-certainty evidence). Corticosteroids (steroids): We are uncertain if intraoperative nausea is reduced by corticosteroids (aRR 0.56, 95% CI 0.37 to 0.83, 6 studies, 609 women, very low-certainty evidence) similarly for intraoperative vomiting (aRR 0.52, 95% CI 0.31 to 0.87, 6 studies, 609 women, very low-certainty evidence). Corticosteroids probably reduce postoperative nausea (aRR 0.59, 95% CI 0.49 to 0.73, 6 studies, 733 women, moderate-certainty evidence), and may reduce postoperative vomiting (aRR 0.68, 95% CI 0.49 to 0.95, 7 studies, 793 women, low-certainty evidence). Antihistamines: Antihistamines may have little to no effect on intraoperative nausea (RR 0.99, 95% CI 0.47 to 2.11, 1 study, 149 women, very low-certainty evidence) or intraoperative vomiting (no events in the one study of 149 women). Antihistamines may reduce postoperative nausea (aRR 0.44, 95% CI 0.30 to 0.64, 4 studies, 514 women, low-certainty evidence), however, we are uncertain whether antihistamines reduce postoperative vomiting (average RR 0.48, 95% CI 0.29 to 0.81, 3 studies, 333 women, very low-certainty evidence). Anticholinergics: Anticholinergics may reduce intraoperative nausea (aRR 0.67, 95% CI 0.51 to 0.87, 4 studies, 453 women, low-certainty evidence) but may have little to no effect on intraoperative vomiting (aRR 0.79, 95% CI 0.40 to 1.54, 4 studies; 453 women, very low-certainty evidence). No studies looked at anticholinergics in postoperative nausea, but they may reduce postoperative vomiting (aRR 0.55, 95% CI 0.41 to 0.74, 1 study, 161 women, low-certainty evidence). Sedatives: We found that sedatives probably reduce intraoperative nausea (aRR 0.65, 95% CI 0.51 to 0.82, 8 studies, 593 women, moderate-certainty evidence) and intraoperative vomiting (aRR 0.35, 95% CI 0.24 to 0.52, 8 studies, 593 women, moderate-certainty evidence). However, we are uncertain whether sedatives reduce postoperative nausea (aRR 0.25, 95% CI 0.09 to 0.71, 2 studies, 145 women, very low-certainty evidence) and they may reduce postoperative vomiting (aRR 0.09, 95% CI 0.03 to 0.28, 2 studies, 145 women, low-certainty evidence). Opioid antagonists: There were no studies assessing intraoperative nausea or vomiting. Opioid antagonists may result in little or no difference to the number of women having postoperative nausea (aRR 0.75, 95% CI 0.39 to 1.45, 1 study, 120 women, low-certainty evidence) or postoperative vomiting (aRR 1.25, 95% CI 0.35 to 4.43, 1 study, 120 women, low-certainty evidence). Acupressure: It is uncertain whether acupressure/acupuncture reduces intraoperative nausea (aRR 0.55, 95% CI 0.41 to 0.74, 9 studies, 1221 women, very low-certainty evidence). Acupressure may reduce intraoperative vomiting (aRR 0.52, 95% CI 0.33 to 0.80, 9 studies, 1221 women, low-certainty evidence) but it is uncertain whether it reduces postoperative nausea (aRR 0.46, 95% CI 0.27 to 0.75, 7 studies, 1069 women, very low-certainty evidence) or postoperative vomiting (aRR 0.52, 95% CI 0.34 to 0.79, 7 studies, 1069 women, very low-certainty evidence). Ginger: It is uncertain whether ginger makes any difference to the number of women having intraoperative nausea (aRR 0.66, 95% CI 0.36 to 1.21, 2 studies, 331 women, very low-certainty evidence), intraoperative vomiting (aRR 0.62, 95% CI 0.38 to 1.00, 2 studies, 331 women, very low-certainty evidence), postoperative nausea (aRR 0.63, 95% CI 0.22 to 1.77, 1 study, 92 women, very low-certainty evidence) and postoperative vomiting (aRR 0.20, 95% CI 0.02 to 1.65, 1 study, 92 women, very low-certainty evidence). Few studies assessed our secondary outcomes including adverse effects or women's views.

AUTHORS' CONCLUSIONS

This review indicates that 5-HT3 antagonists, dopamine antagonists, corticosteroids, sedatives and acupressure probably or possibly have efficacy in reducing nausea and vomiting in women undergoing regional anaesthesia for caesarean section. However the certainty of evidence varied widely and was generally low. Future research is needed to assess side effects of treatment, women's views and to compare the efficacy of combinations of different medications.

Management strategies for the treatment and prevention of postoperative/postdischarge nausea and vomiting: an updated review

Postoperative nausea and vomiting (PONV) and postdischarge nausea and vomiting (PDNV) remain common and distressing complications following surgery. The routine use of opioid analgesics for perioperative pain management is a major contributing factor to both PONV and PDNV after surgery. PONV and PDNV can delay discharge from the hospital or surgicenter, delay the return to normal activities of daily living after discharge home, and increase medical costs. The high incidence of PONV and PDNV has persisted despite the introduction of many new antiemetic drugs (and more aggressive use of antiemetic prophylaxis) over the last two decades as a result of growth in minimally invasive ambulatory surgery and the increased emphasis on earlier mobilization and discharge after both minor and major surgical procedures (e.g. enhanced recovery protocols). Pharmacologic management of PONV should be tailored to the patient’s risk level using the validated PONV and PDNV risk-scoring systems to encourage cost-effective practices and minimize the potential for adverse side effects due to drug interactions in the perioperative period. A combination of prophylactic antiemetic drugs with different mechanisms of action should be administered to patients with moderate to high risk of developing PONV. In addition to utilizing prophylactic antiemetic drugs, the management of perioperative pain using opioid-sparing multimodal analgesic techniques is critically important for achieving an enhanced recovery after surgery. In conclusion, the utilization of strategies to reduce the baseline risk of PONV (e.g. adequate hydration and the use of nonpharmacologic antiemetic and opioid-sparing analgesic techniques) and implementing multimodal antiemetic and analgesic regimens will reduce the likelihood of patients developing PONV and PDNV after surgery.

Naturopathic Treatment and Complementary Medicine in Surgical Practice

BACKGROUND

Many patients in Germany use naturopathic treatments and complementary medicine. Surveys have shown that many also use them as a concomitant treatment to surgery.

METHODS

Multiple databases were systematically searched for systematic reviews, controlled trials, and experimental studies concerning the use of naturopathic treatments and complementary medicine in the management of typical post-operative problems (PROSPERO CRD42018095330).

RESULTS

Of the 387 publications identified by the search, 76 fulfilled the inclusion criteria. In patients with abnormal gastrointestinal activity, acupuncture can improve motility, ease the passing of flatus, and lead to earlier defecation. Acupuncture and acupressure can reduce postoperative nausea and vomiting, as well as pain. More-over,aromatherapy and music therapy seem to reduce pain, stress and anxiety and to improve sleep. Further studies are needed to determine whether phytotherapeutic treatments are effective for the improvement of gastrointestinal function or the reduction of stress. It also remains unclear whether surgical patients can benefit from the methods of mind body medicine.

CONCLUSION

Certain naturopathic treatments and complementary medical methods may be useful in postoperative care and deserve more intensive study. In the publications consulted for this review, no serious side effects were reported.

Herbal medications for anxiety, depression, pain, nausea and vomiting related to preoperative surgical patients: a systematic review and meta-analysis of randomised controlled trials

OBJECTIVE

To summarise the effects of herbal medications for the prevention of anxiety, depression, pain, and postoperative nausea and vomiting (PONV) in patients undergoing laparoscopic, obstetrical/gynaecological or cardiovascular surgical procedures.

METHODS

Searches of MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials and LILACS up until January 2018 were performed to identify randomised controlled trials (RCTs). We included RCTs or quasi-RCTs evaluating any herbal medication among adults undergoing laparoscopic, obstetrical/gynaecological or cardiovascular surgeries. The primary outcomes were anxiety, depression, pain and PONV. We used the Grading of Recommendations Assessment, Development and Evaluation approach to rate overall certainty of the evidence for each outcome.

RESULTS

Eleven trials including 693 patients were eligible. Results from three RCTs suggested a statistically significant reduction in vomiting (relative risk/risk ratio (RR) 0.57; 95% CI 0.38 to 0.86) and nausea (RR 0.69; 95% CI 0.50 to 0.96) with the use of Zingiber officinale (ginger) compared with placebo in both laparoscopic and obstetrical/gynaecological surgeries. Results suggested a non-statistically significantly reduction in the need for rescue medication for pain (RR 0.52; 95% CI 0.13 to 2.13) with Rosa damascena (damask rose) and ginger compared with placebo in laparoscopic and obstetrical/gynaecological surgery. None of the included studies reported on adverse events (AEs).

CONCLUSIONS

There is very low-certainty evidence regarding the efficacy of both Zingiber officinale and Rosa damascena in reducing vomiting (200 fewer cases per 1000; 288 fewer to 205 fewer), nausea (207 fewer cases per 1000; 333 fewer to 27 fewer) and the need for rescue medication for pain (666 fewer cases per 1000; 580 fewer to 752 more) in patients undergoing either laparoscopic or obstetrical/gynaecological surgeries. Among our eligible studies, there was no reported evidence on AEs.

PROSPERO REGISTRATION NUMBER

CRD42016042838.

Ginger in gastrointestinal disorders: A systematic review of clinical trials

Ginger, the rhizome of Zingiber officinale, which is used as a spice globally has a long history of medicinal use that stimulates investigators to assess its potential roles as an adjuvant therapy or alternative medicine in a range of diseases. Anti-inflammatory, antioxidant, antitumor, and antiulcer effects of ginger have been proven in many scientific studies, and some of the ancient applications of ginger as a home remedy has been confirmed in human. In this review, we summarized the current evidence on the effects of ginger consumption on gastrointestinal disorders based on clinical trials. Our data indicate that divided lower daily dosage of 1500 mg ginger is beneficial for nausea relief. Because of limited number of studies on some other gastrointestinal disorders, the results may not be as much powered as to find significant results. Therefore, more extensive and well-controlled human studies of ginger or its standard extracts are required to demonstrate its efficacy as a gastroprotective agent. Dose-finding studies should be undertaken to accurately determine the effective dose and preparation of ginger in further clinical trials protocol.

Ginger (Zingiber officinale): An alternative for the prevention of postoperative nausea and vomiting. A meta-analysis

BACKGROUND

Postoperative nausea and vomiting (PONV) is a distressing outcome related to surgeries. Traditionally, ginger has been used in the treatment of nausea and vomiting for thousands of years. Recently, several randomized, placebo-controlled clinical trials (RCTs) have been conducted to evaluate the efficacy of ginger in PONV.

PURPOSE

To systematically evaluate the efficacy of ginger on postoperative nausea and vomiting (PONV) compared to placebo, based on RCTs.

STUDY DESIGN

The meta-analysis was reported following the PRISMA guidelines using the PICO format, and it was registered with the PROSPERO register.

METHODS

PubMed, Embase, the Cochrane Central Register of Controlled Trials and Web of Science were searched for relevant studies. Human, placebo-controlled clinical studies of patients undergoing any types of surgery, receiving pharmacological doses of ginger per os were included. Only clinical trials with explicit description of the ginger preparation used were analysed. No language or publication year restrictions was applied.

RESULTS

Ten randomized trials including a total of 918 patients were pooled for the statistical analysis. The present meta-analysis supports that ginger has a significant effect on the severity of PONV based on visual analogue scale (VAS) results: in a fixed effects model the pooled standardized mean difference (SMD) was -0.247 (favouring ginger; [LL]: -0.455, [UL]: -0.040, p-value: 0.019). Moreover, our results suggest that ginger reduces the incidence of postoperative nausea and vomiting, as well antiemetic drug demand; however, these effects are not statistically significant compared to placebo, which may be explained by underdosing.

CONCLUSIONS

According to our thorough meta-analysis ginger is safe and well tolerated, and decreases the severity of PONV, and may lower the incidence of postoperative nausea and vomiting, which in turn may reduce antiemetic drug demand, suggesting that ginger may be a useful alternative to antiemetic medications to alleviate PONV.

A randomized, double-blind, placebo-controlled trial on the efficacy of ginger in the prevention of abdominal distention in post cesarean section patients

The objective of the study was to evaluate the efficacy of ginger in the prevention of abdominal distention in post cesarean section patients. A randomized, double-blind, placebo controlled trial was conducted. One hundred and seventy-eight post cesarean section patients were either randomized to the study group receiving oral ginger capsules or to the placebo group receiving oral placebo capsules. The average age of the studied women was 32.3 years. The incidence of postoperative abdominal distention was not different between the ginger and the placebo groups (20.2% vs 29.2%, p = 0.328). The efficacy to relieve abdominal distention was superior in the ginger group than the placebo group (91% vs 65.2%, p < 0.001). With regards to quality of life, the number of patients who had the ability to eat was higher in the ginger group than in the placebo group (59.6% vs 43.8%, p = 0.035). There were no significant differences in time to first flatus, maternal satisfaction, and side effects. Ginger does not decrease the incidence of post cesarean section abdominal distention. But, ginger is more effective than the placebo in relieving the severity of abdominal distention on the fourth day after operation and improving the ability to eat.

Aromatherapy for treatment of postoperative nausea and vomiting

BACKGROUND

Postoperative nausea and vomiting (PONV) is a common, unpleasant phenomenon and current therapies are not always effective for all patients. Aromatherapy has been suggested as an addition to the available treatment strategies. This review was originally published in 2012 and updated in 2017.

OBJECTIVES

The main objective was to establish the efficacy and safety of aromatherapy comparable to standard pharmacological treatments for PONV in adults and children.

SEARCH METHODS

We searched CENTRAL; MEDLINE; Embase; CINAHL; CAM on PubMed; Informit; LILACS; and ISI Web of Science as well as grey literature sources and the reference lists of retrieved articles up to March 2017. The original search was performed in August 2011.

SELECTION CRITERIA

We included all randomized controlled trials (RCTs) and controlled clinical trials (CCTs) where aromatherapy was used to treat PONV. Interventions were all types of aromatherapy compared to placebo or with standard antiemetics. Primary outcomes were severity and duration of PONV. Secondary outcomes were adverse reactions, use of rescue antiemetics and patient satisfaction.

DATA COLLECTION AND ANALYSIS

Two review authors independently assessed risk of bias in the included studies and extracted data. For dichotomous outcome variables, we used a random-effects model and calculated risk ratio (RR) with associated 95% confidence interval (95% CI). For continuous outcome variables, we used a random-effects model and calculated standardized mean difference (SMD) with associated 95% CI. We used the GRADE software to compile 'Summary of findings' tables.

MAIN RESULTS

We included seven new studies with 663 participants in the 2017 update; five RCTs and two CCTs. These were added to the nine previously included studies (six RCTs and three CCTs with a total of 373 participants) for a total of 16 included studies and 1036 participants in this updated review. The mean age and range data for all participants were not reported for all studies. We identified two registered trials that met the inclusion criteria for this review; however there are no results for these studies yet.Overall, the GRADE assessment of evidence quality ranged from moderate to very low. The method of randomization in 11 of the 12 included RCTs was explicitly stated and adequate. Incomplete or methodologically diverse reporting of data affected the completeness of the analysis. Data on additional aromatherapies were added in the 2017 update (blended aromatherapy products, and peppermint products). Heterogeneity of outcome measures and time points between studies affected the completeness of the analysis.In the summary of the findings of six studies, we did not find aromatherapy to be effective in reducing nausea severity in comparison to placebo (SMD -0.22, 95% CI -0.63 to 0.18, P value = 0.28, 241 participants, level of evidence: low). Those participants receiving aromatherapy were no more likely to be free of nausea at the end of the treatment period than those receiving placebo (RR 3.25, 95% CI 0.31 to 34.33, P value = 0.33, 4 trials, 193 participants, evidence level: very low), however they were less likely to require rescue antiemetics (RR 0.60, 95% CI 0.37 to 0.97, P value = 0.04, 7 trials, 609 participants, evidence level: low). There were no data reported on adverse events or patient satisfaction for this comparison.A specific comparison of peppermint aromatherapy to placebo did not show evidence of an effect on nausea severity at five minutes post-treatment in the pooled results (SMD -0.18, 95% CI -0.86 to 0.49, P value = 0.59, 4 trials, 115 participants, evidence level: low). There were no data reported on nausea duration, use of rescue antiemetics, adverse events or patient satisfaction for this comparison.When we pooled studies comparing isopropyl alcohol to standard antiemetic treatment in a GRADE summary of findings, in terms of nausea duration, there was a significant effect on the time in minutes to a 50% reduction in nausea scores (SMD -1.10, 95% CI -1.43 to -0.78, P value < 0.00001, 3 trials, 176 participants, evidence level: moderate). Fewer participants who received isopropyl alcohol required rescue antiemetics (RR 0.67, 95% CI 0.46 to 0.98, P value = 0.04, 215 participants, 4 trials, evidence level: moderate). Two studies with 172 participants measured patient satisfaction; there were high levels of satisfaction across both aromatherapy and standard treatment groups and no differences found (evidence level: low). There were no data reported on nausea severity or adverse events for this comparison.There was no difference in effectiveness between isopropyl alcohol vapour inhalation and placebo for reducing the proportion of participants requiring rescue antiemetics (RR 0.39, 95% CI 0.12 to 1.24, P value = 0.11, 291 participants, 4 trials, evidence level: very low). There were no data reported on nausea severity, nausea duration, adverse events or patient satisfaction for this comparison.

AUTHORS' CONCLUSIONS

Overall, for nausea severity at the end of treatment, aromatherapy may have similar effectiveness to placebo and similar numbers of participants were nausea-free. However, this finding is based on low-quality evidence and therefore very uncertain. Low-quality evidence also suggests that participants who received aromatherapy may need fewer antiemetic medications, but again, this is uncertain. Participants receiving either aromatherapy or antiemetic medications may report similar levels of satisfaction with their treatment, according to low-quality evidence.