Centres conducting review
Alice Lee Centre for Nursing Studies, National University of Singapore: A Collaborating Centre of the Joanna Briggs Institute
Name: Boh Boi Wong SRN,SCM, BHSC (BSC Nursing),MEdECE
Telephone: +65 67917506
Name: Dr Serena Koh RN BSc (Hons),Adv Dip(Midwifery) PhD
Telephone: +65 6325 9220
Email: serena_ firstname.lastname@example.org_
Third reviewer/ contact
Name: Dr Desley Gail HEGNEYRN, BA (Hons),DNE, FRCNA,PhD
Telephone: + 65 6776 7135
Email: Desley_ Hegney@nuhs.edu.sg
The effectiveness of chilled/cold cabbage leaf application on breast engorgement in breastfeeding women
This systematic review aims to synthesize the best available evidence on the effectiveness of cabbage leaves on engorged breasts in breastfeeding women.
Breast engorgement is defined by the medical dictionary as congestion and distension with fluid.1 The lactation literature defines it as a swollen breast, caused by the buildup of breast milk during breastfeeding, and is often referred to as swelling and distension of the breasts and can be a painful condition.2, 3This is a common physiological problem for lactating mothers that is caused by the sudden increase in the volume of the breast milk due to lymphatic and vascular congestion with interstitial oedema during the first two weeks of breastfeeding.4 The reason why engorgement occurs in the first two weeks postpartum is that the mother and her baby are adjusting to the process of demand and supply: i.e. if the milk production is increased too rapidly this may exceed the capacity of the breast alveoli to store it.
If the milk is not removed the distention can lead to capillary blood circulation occlusion and reduce the cellular activity.5 It has also been proposed that low breast milk supply may further lead to the baby becoming fretful.6, 7 Breast engorgement may occur due to insufficient emptying of the breast milk from the mother due to poor transfer of breast milk and incorrect latching or positioning of the baby during the process of suckling.2, 4 Methods of measuring breast engorgement include: measurements of chest circumference changes8 and thermography.9 Ferris and Riedel have also proposed the use of a pressure gauge to measure skin tension10, 11 as a way of evaluating and measuring breast engorgement.
Previous comparative research studies suggest that breast engorgement occurs most commonly from day three to five postpartum, with some women presenting as late as day nine to ten;7, 12, 13 or even day fourteen.14 It has also been reported that multiple peaks of engorgement throughout the breastfeeding period are not uncommon.15, 16
Engorgement of the breasts is associated with severe pain, nipple tenderness, fissures of the nipple and infection which can all result in subsequent cessation of breastfeeding.17Breast engorgement can be characterized by low grade fever and absence of systemic symptoms. The breasts feel warm to touch and appear shiny and it can be quite painful for some women when the breasts become hard. Throughout the world, breast engorgement is one of the main reasons why women stop breastfeeding,17-19 or suffer from a reduced /short duration of breastfeeding.
In March, 2001 The World Health Organization (WHO) recommended an optimal duration of exclusive breastfeeding of six months.20, 21
Many methods for the treatment of breast engorgement have been explored. These include cold cabbage compresses,22, 23 cold gel pads,24 hot compresses and warm showers, which are used to activate the milk ejection reflex.25 Further treatment methods which have been postulated include the use of therapeutic ultrasound,25, 26 breast binding,12, 13 breast massage,27 herbal remedies, manual/electrical pump, anti inflammatory medication (such as serrapeptase [Danzen]25 which reduces swelling).25, 28 In Taiwan a Randomized Controlled Trial used Gua-Sha (massage) therapy as a form of treatment.29, 30
One approach which has met with a high degree of success is the use of diuretics and restricting the intake of fluids. One study on the use of diuretics found that 85.7% of mothers displayed marked improvement after 3 days.22, 28, 31 Nonetheless, the use of diuretics is not recommended for the nursing mother as they reduce the production of breast milk due to the dehydration from the diuretics.2 Additionally, many women are reluctant to take drugs when breastfeeding.32
Although diuretics and other drugs have been shown to be effective in the treatment of breast engorgement, for the reasons described above (i.e. the mother wishes to nurse her child or is unwilling to use a drug-based remedy), women are turning to non-medical treatments for breast engorgement, such as warm or cold compresses, breast massage, or the use of cold cabbage leaves. These non-medical interventions are receiving increasing attention as viable treatment methods22, 30, 33, 34 as they are more easily available and generally easy to use, convenient and cheap as compared to medical interventions. For example, many women's preferred treatment for breast engorgement is chilled cabbage leaves as the effect is stronger and takes effect quickly24. Thus, determining the efficacy of non-medical interventions for treatment of breast engorgement is becoming increasingly important.
One non-medical intervention, cabbage leaf treatment, has become increasingly popular as it is cheap, easily available and is a natural remedy which some studies have found to be effective22,24 while others have not.22,28,34 For example:
- Cabbage leaves have been found to be effective in the treatment of engorgement due to the drawing action of cabbage leaves on human tissue.35
- A Quasi - experimental study on the difference in effectiveness between cold and room temperature cabbage leaves, concluded that there was no difference in effectiveness if the leaves were chilled before use.24
- In Australia, a comparative study using cabbage leaf extract was used for the treatment of breast engorgement. It was found that the cabbage leaf extract cream and a placebo cream were effective in relieving discomfort and the two groups showed no differences on all outcome measures.34
- In a quasi-experimental study in India cold cabbage leaves, as well as alternate hot and cold compresses, were used in the treatment of breast engorgement. It was found that hot and cold compresses were more effective than cold cabbage leaves in relieving pain due to breast engorgement.22
- A systematic review of various forms of treatment for breast engorgement (including acupuncture, cabbage leaves, drug treatment and cold packs) concluded that there is insufficient evidence from trials on any intervention to justify widespread implementation.26
- In Singapore a comparative study was carried out on breast engorgement using drugs and other various methods, including cabbage leaf treatment and its effectiveness as compared to medical/drug-related treatment, finding that drug treatment was more effective than chilled cabbage leaves and other non-medical interventions.28
Existing research evidence has revealed discrepancies in findings of the effectiveness of cabbage leaf treatment. Additionally, the effectiveness of cabbage leaf treatment on its own is unclear as in many studies cabbage leaf treatment is combined with other forms of treatment, thus casting doubt over the effectiveness of cabbage leaf alone as a viable form of treatment. This systematic review will focus on the effectiveness of cabbage leaf treatment on breast engorgement.
Types of participants
The review will consider breastfeeding women aged thirteen to fifty years of age of any parity regardless of previous breast engorgement problems and treatments. The women chosen include participants from different geographical locations. The participants are all breastfeeding women in the first two weeks postpartum, as the first two weeks postpartum is the most crucial period for nursing mothers to establish their lactation and when breast engorgement is most likely to occur.
We will exclude women with mastitis, plugged ducts, breast abscess and women who have ceased breast feeding.
Types of Intervention
The review will consider the use of cabbage leaves to relieve breast engorgement. It will only include papers that provide data on cabbage leaf treatment for breast engorgement. It will exclude cabbage leaf extract creams, as it appears that cabbage extract cream is different to cabbage leaves.
As there is no consistent method/system of treatment in relation to the use of cold cabbage leaves (including the number of leaves used [which vary from one to three pieces]) and the duration of treatment [which varies from ten minutes to two hours], all these interventions will be considered. Furthermore, as the various studies to not specify if a specific type of leaf, any type of cabbage leaf will be included. 33, 36-38
Types of Outcomes
This review will consider studies that include the following outcome measures:
The primary outcome of interest is the effectiveness of cabbage leaves on breast engorgement, defined as a reduction in engorgement, the severity of the distention and the level of hardness to touch.
It should be noted that the pattern of experience of engorgement is different for all mothers8 and can occur in any of three patterns:
- a single experience of firm, tender breasts followed by a resolution of symptoms;
- multiple peaks of engorgement followed by resolution;
- intense and painful engorgement lasting up to fourteen days; and minimal breast changes.
Duration of Breastfeeding. For the purpose of this systematic review, breastfeeding duration is recommended for an optimal duration of exclusive breastfeeding of six months by the World Health Organization (WHO). 20, 21
Types of studies
The review will consider any randomised controlled trials (RCTs). In the absence of RCTs other research designs, such as non-randomised controlled trials, before and after studies, case control studies, cohort studies, descriptive studies such as case series/reports, will be considered for inclusion to enable the identification of the current best evidence for the effects of cabbage leaf on breast engorgement in breastfeeding women.
Papers which include narration, are opinion based or obtained from general experience, will not be included.
The search strategy aims to find both published and unpublished studies from inception of the relevant database to 2010 in the English Language. A three-step search strategy will be utilised in each component of this review. An initial limited search of MEDLINE, CINAHL and SCOPUS will be undertaken followed by an analysis of the text words contained in the title and abstract, and of the index terms used to describe an article. A second search using all identified keywords and index terms will then be undertaken across all included databases. Thirdly, the reference list of all identified reports and articles will be searched for additional studies.
The databases to be searched include:
Web of Science
The search for unpublished studies will include:
Initial keywords to be used will be:
Breast milk retention
Duration of breastfeeding
The search strategy is set out in further detail in Appendix I
Assessment of Methodological Quality
Quantitative papers selected for retrieval will be assessed by two independent reviewers for methodological validity prior to inclusion in the review using standardised critical appraisal instruments from the Joanna Briggs Institute Meta Analysis of Statistics Assessment and Review Instrument (JBI-MAStARI) (Appendix II).Any disagreements that arise between the reviewers will be resolved through discussion, or with a third reviewer.
Quantitative data will be extracted from papers included in the review using the standardised data extraction tool from JBI-MAStARI (Appendix III).The data extracted will include specific details about the interventions, populations, study methods and outcomes of significance to the review question and specific objectives.
Quantitative papers will, where possible be pooled in statistical meta-analysis using the Joanna Briggs Institute Meta Analysis of Statistics Assessment and Review Instrument (JBI-MAStARI). All results will be subject to double data entry. Odds ratio (for categorical data) and weighted mean differences (for continuous data) and their 95% confidence intervals will be calculated for analysis. Heterogeneity will be assessed using the standard Chi-square. Where statistical pooling is not possible the findings will be presented in narrative form.
Conflict of Interest
There are no conflicts of interest.
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Appendix 1 - Search Strategy
Appendix II: Critical Appraisal tools
JBI Critical Appraisal Checklist for Experimental Studies
JBI Critical Appraisal Checklist for Comparable Cohort/ Case Control
JBI Critical Appraisal Checklist for Descriptive/ Case Series
Appendix III: Data Extraction Form (Quantitative Data)