‘A Complete Guide to Maggot Therapy’
Stadler, F. (2022). Chapter 3: ‘Wound Aetiologies, Patient Characteristics, and Healthcare Settings Amenable to Maggot Therapy’ in ‘A Complete Guide to Maggot Therapy: Clinical Practice, Therapeutic Principles, Production, Distribution, and Ethics’. Open Book Publishers.
DOI: https://doi.org/10.11647/ obp.0300
It is important for healthcare practitioners to understand when to use maggot therapy. This article explains the general factors that determine the choice of wound treatment and how they apply to maggot therapy: firstly the wound characteristics, secondly the patient characteristics, thirdly the environment, fourthly the available resources, and fifthly the specific characteristics of each available treatment modality. Beyond the regular healthcare setting, maggot therapy can make a significant contribution to the treatment of people with wounds in compromised healthcare settings such as in times of disaster and armed conflict, in underserved populations, or in palliative care.
Irvine CA, United States
There is a great need for improved wound care in both resourced and compromised healthcare settings. Although not a panacea, maggot therapy can meet many of these pressing wound care needs. It is well-established that medicinal maggots have three major actions on wounds: 1) they dissolve and dislodge dead (necrotic) tissue and debris (debridement), 2) they kill microorganisms (“disinfection”), and 3) they stimulate healthy tissue to grow faster.1-3 Therefore, maggot therapy can usually assist in treating wounds that require any of these actions. Notwithstanding this broad spectrum of potential indications, it is important for healthcare policy makers, regulators, and health administrators to understand the contribution maggot therapy can make to wound care in order to support mainstreaming of this therapy.4 It is also important for healthcare practitioners to understand when to use maggot therapy.
While treatment selection can seem quite complicated at times, the following general factors should always be considered when choosing a wound treatment:
•
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The wound characteristics
The patient characteristics
The environment
•
•
•
The available resources
The specific characteristics of each available treatment modality.
Examples of how these factors might affect treatment decisions can be found in Table 1.
Using these characteristics as a guiding framework, this article explains when maggot therapy is indicated.
It should also be noted that the specific types of wounds and situations that are appropriately treated with a particular method or product are usually based on scientific studies, anecdotal reports, personal experience, and regulatory approvals. Since maggot therapy is not officially regulated in most countries, this discussion of indications for maggot therapy is based primarily on its mechanisms of action and on published experience.
Most wounds on an otherwise healthy person will heal quite well despite our choice of therapy. But when dead tissue covers or fills that wound, then the surrounding healthy tissue cannot fill the void. What’s more, microorganisms that live and feed on dead tissue, or under its cover, can multiply and spread beyond these borders, especially if they can also live in the surrounding live tissue. Even if they cannot themselves spread beyond dead tissue, their secretions (called “toxins”) may be harmful to the surrounding live tissue, and may cause that tissue, too, to become inflamed and/or die, thereby extending the wound. Although scientific proof is sparse, there is wide agreement that a wound with necrotic tissue and debris will not easily heal until the necrotic tissue and debris is removed.5,6
Table 1: Factors to consider when selecting wound treatments.
1. Wound characteristics
2.
Maggots must compete fiercely with other scavengers for limited resources, and many of those competing scavengers would consume the maggots, too, if the maggots were found still on the rotting tissue. The maggots used therapeutically are those that are well-adapted to quickly remove (and ingest) as much of the necrotic tissue and debris as possible, and then leave the area. Maggot therapy debrides the necrotic wound by at least two methods: enzymatic debridement and physical
• Infection might require specific antimicrobial treatment; aggressive infection might require immediate resection or at least close daily or hourly inspection
• Dead tissue and debris often require removal (debridement) before healing can fully transpire
• If the wound cannot be visualised completely, accommodations will need to be made to ensure that even non-visualised surfaces are cleaned and disinfected
• If vital structures (major vessels, nerves and organs) are involved, accommodations will need to be made to ensure that they are not damaged in the attempt to halt the infection or remove dead tissues
• Factors that affect wound healing (i.e., malnutrition, anaemia, diabetes, peripheral vascular disease)
• Factors that affect a patient’s ability to tolerate surgery or other treatments (i.e., underlying heart, kidney, liver disease)
• Factors that affect a patient’s ability to participate in the therapy, to the degree that will be necessary (i.e., ability to consent; physical and mental limitations on the ability to do dressing changes; social support at home; financial limitations; cultural/ religious factors)
• Availability of shelter, electricity, refrigeration, clean or sterile water, transportation
• Weather/temperature extremes can impact the access to or shelf-life of certain products (i.e., medicinal maggots cannot survive extreme cold or hot temperatures unless stored and transported in temperature-resistant containers)
• Physically/structurally stable environment may be required by certain treatments; this is threatened by ongoing earthquake aftershocks, wildfires, flooding, or civil unrest and conflict
• Financial resources available to the individual
• Availability of healthcare insurance
• Level of healthcare resource availability in the country or region
• Physical ability to access those resources (i.e., transportation and accommodation to access care only available in regional centres; availability of treatment in the home)
• Availability of adequately trained wound care providers
• Policies at all levels which affect the availability, provision and financing of various treatment modalities
• Efficacy
• Safety
• Cost and likelihood of reimbursement
• Acceptability to the patient and care provider
• Indications and contraindications
• Regulatory status (i.e., whether it is locally considered to be an approved, unapproved, or investigational modality)
The maggot’s digestive juices, rich with proteolytic enzymes, are excreted into the wound bed and quickly dissolve dead tissue. Meanwhile, as the maggot crawls about the wound bed, its microscopic spines and its modified mandibles (‘mouth hooks’) physically dislodge some of the debris, helping the digestive juices gain access into the crevices.
Given that medicinal blowflies, if living in the wild, would inhabit corpses, faeces, and other rotting organic matter, it seems logical that the larvae would have a method for killing infectious organisms, or else the microbes might kill the maggots. The mechanisms by which the maggots accomplish microbial killing are covered by Nigam and Wilson.2 For the purpose of this discussion, let it suffice to acknowledge that medicinal maggots kill microbes through a variety of mechanisms including ingestion,8,9 the secretion of antimicrobial compounds,10-15 dissolving biofilm,12,16-21 and altering the local environment in ways that make it less hospitable to microbial pathogens.22,23 The end result is that microbial populations are reduced or eliminated,24-26 and clinical infections subside.27,28 The antimicrobial effect may even endure well beyond the life of the maggots.29
Wounds can vary greatly in wetness. Some wounds are extremely dry; the necrotic tissue covering the wound being like leather (“eschar”). Other wounds may drain serous (watery), serosanguinous (bloody), or purulent (pus-filled) liquid profusely. The same wound may switch back and forth over the course of a week. Many dressings are suitable only for moderately dry wounds, or only for very wet wounds. Some dressings will not adhere to a wet wound; others are designed to absorb excess fluid tenaciously, making them superfluous or even dangerous for use with a minimally moist wound. Medicinal maggots have no such limitations, though the dressings used to confine them to the wound may themselves need to be selected or modified to meet the moisture conditions of the wound and surrounding tissue.
Maggot therapy has been observed to enhance
wound healing, even in apparently clean but stagnant wounds, at least as far back as William Baer’s time.31
Subsequent clinicians have described, in controlled studies, the rapid proliferation of granulation tissue and hastened closing of the wound margins in previously stagnant, nonhealing wounds.32-25 The mechanisms known to be involved are described by Nigam and Wilson.3 More and more therapists are using maggot therapy to promote healing and closure of chronic wounds, even though the wounds may not appear grossly necrotic nor infected. Some of the therapists describe this indication as maintenance debridement, others say their intent is growth-stimulation. The desired endpoint is the same: not just a clean (debrided) wound but a clean wound that is healing.
Pressure alone, from lying in the same position for a prolonged time, or in combination with shear force, can starve tissue of oxygenated blood which leads to tissue death. Shear may exacerbate the injury and cause mechanical damage to the compromised tissue.36
Factors other than pressure can also prevent arterial blood from reaching tissue. Primary arterial disease, for example (i.e., vasculitis, arteritis obliterans, or thromboses) can occlude arteries and arterioles, leading to local necrosis of the skin and soft tissue. Many anecdotal reports support the use of maggot therapy for debriding these wounds.40-43 However, without adequate blood flow, healing cannot occur even in the maggot-debrided wound.40,41
Therefore, the arterial flow needs to be assessed prior to maggot therapy. Even if arterial flow
“More and more therapists are using maggot therapy to promote healing and closure of chronic wounds, even though the wounds may not appear grossly necrotic nor infected.”
cannot be restored, maggot therapy can be administered to palliate ulcer symptoms such as exudate and odour and to prevent infection, thereby maintaining quality of life.
Venous disease, too, can lead to skin and softtissue wounds. Venous insufficiency results in legs, for example, with increased intravascular pressure. The result is that fluid (serum) leaks out of the blood vessels and into the soft tissue, thereby causing swelling, pain, itching (trauma and infection from scratching). Oxygen cannot easily perfuse the fluid-filled (oedematous) leg, and the normal immune mechanisms (i.e., migration of white blood cells) are similarly impaired. In the end, skin breaks down more easily, the body does not fight the infections well, and healing is impaired (Figure 1a). Venous ulcers are best prevented by compression and elevation of the affected limb. However, when a person presents with a venous ulcer, then regular debridement is necessary along with compression and elevation of the limb. Multiple controlled and non-controlled maggot therapy studies have described faster debridement (with or without faster healing) of venous ulcers.38,44-46
Diabetic Foot Disease/ Diabetes Related Foot Ulcers (DFUs)
Diabetes results in multi-system disease. Neuropathy can lead to increased trauma, impaired immunity interferes with the body’s ability to fight infection, and blood vessel disease greatly inhibits healing (Figures 1c, 1d). DFUs require timely and expert assessment to identify the aetiology and prompt initiation of tailored management.47
When aetiology is not ascertained, management will fail to address the underlying cause, which may lead to amputation.48 Up to 85% of amputations can be prevented.49,50 Maggot therapy is often used to debride these wounds and control emerging infections. Several controlled studies32,34 and case series51 have demonstrated significant benefits.
Medicinal maggots are quite useful in debriding
traumatic and infected or necrotic post-surgical wounds (Figure 1e, 1f). In an otherwise healthy individual, these wounds usually heal quite well after initial debridement and infection management.
Unlike many other necrotic wounds, burns need to be debrided acutely (Figure 1g). When the burn area is extensive or when vital structures could be damaged by surgical debridement, maggot debridement has proven to be a good alternative.10,52-58 Burn wounds are often painful, and maggot therapy is not likely to be less painful than any other manipulation of the damaged tissue. Therefore, anaesthetics will be just as necessary during maggot debridement as during any other form of debridement, and maybe more so.
Undermining Wounds, Difficult to Reach or Visualise
Because medicinal maggots, by nature, crawl into nooks and crannies, they are very appropriate for treating wounds whose boundaries may not be easily visualised. Like miners, the larvae will crawl into the depths of undermined tissue and sinus tracts, debriding within these areas until they need to return to the surface for air, food (assuming that the area no longer contains necrotic tissue or nutritious liquid), or to moult. Treating undermining wounds with maggot therapy can avoid having to open a deep cavity for accurate visualisation and debridement.
Similar to undermined wounds and sinus tracts, medicinal maggots have been used effectively to debride body cavities with infected necrotic tissue, such as necrotising peritonitis or chronic empyema.56 If debridement is not needed in the crevices or out-of-sight areas of these cavities, it may be possible and preferable to apply the maggots within sealed mesh bags so that they stay contained and can be more easily removed.30
Bone infections (‘osteomyelitis’) were a
common indication for maggot therapy during the 1930s, when many orthopaedic surgeons used maggot therapy to perform the ‘fine debridement’ after the surgeon removed the grossly infected or dead bone.31,59,60 We now have procedures and antibiotics that make postoperative infections much less common. Maggot therapy is rarely used for osteomyelitis at all anymore; osteomyelitis is generally considered a surgical disease, treated by removing (resecting) the dead bone and by long-term antibiotics to prevent spread or recurrence of the infection. However, when surgical resection and/or antibiotics are inadequate or are not an option, maggot therapy is sometimes used to debride the bone.61-63 Similarly, infected joints and joint prostheses are generally treated by removing the infected hardware and draining the infection, along with antibiotic coverage. But when the removal of hardware is risky or impossible, maggot therapy has been used alongside the antibiotics to eliminate the infection.64,65
Medicinal maggots dissolve necrotic tissue, but not viable tissue. In that regard, they are not useful for killing live cancer cells. However, when a tumour mass outstrips its blood supply and starts to rot, maggot therapy can be a rapid and effective method for removing the necrotic mass (Figure 1h). Many cancer patients were able to return to a reasonably normal life in public only after maggot therapy removed their foul-smelling, draining, painfully infected tumours.66-68
Because blowflies kill microbes through mechanisms other than those used by typical antibiotics,2 they are effective in killing pathogens that have developed resistance to those antibiotics, such as methicillin-resistant Staphylococcus aureus (MRSA);66-68 and multiresistant Acinetobacter.69
Maggot secretions kill or inhibit representative fungi in the laboratory,70,71 though very little
Figure 1: Chronic wounds amenable to maggot therapy: a) pressure ulcer, b) venous stasis ulcer, c&d) diabetic foot ulcers, e) burn, f) surgical wound dehiscence, g) orthopaedic wound, h) malignancy.
Photos: © Steve Thomas, www.medetec.co.uk.
clinical experience with fungi has been published.72
Several microbes, and especially mixed aerobic and anaerobic infections, can be highly destructive to soft tissue, causing necrosis that rapidly extends down to the deep layers of muscle and bone. Fasciitis is a surgical emergency. Even with immediate resection of the dead tissue, systemic broad-spectrum antibiotics and intensive care, the mortality of these infections can still exceed 40%.73 Frequently, repeated surgical debridement is required, ultimately leading to destruction or resection of vital structures, and the need for major anatomical reconstruction, if the patient survives at all. Maggot therapy has been used successfully to debride these wounds without unnecessarily harming the remaining viable tissue.74-77 In a small but prospective study, patients with Fournier’s gangrene that were
debrided only by maggots if they required more than one initial surgical resection, not only survived their wounds without the need for any additional surgical debridement but also avoided the need for reconstructive surgery.78
Tropical Ulcers (Mycobacteriosis and Tropical Phagedenic Ulcers)
The term ‘tropical ulcers’ collectively refers to painful wounds in typically malnourished individuals living in tropical climates. The wounds often follow trauma, and they may be colonised, if not caused, by Mycobacterium ulcerans (Buruli ulcer, mycobacteriosis) or Fusobacterium and Borrelia (Phagedenic ulcers, Naga sores).79
These are chronic wounds often with very poor outcomes, though antibiotics and improved nutrition can be curative. Buruli ulcers (Mycobacterium ulcerans wounds) often deteriorate following what appears to be appropriate antimicrobial therapy.80 Medicinal maggots were used extensively in the 1930s as an adjunct to surgical resection, in the treatment of tuberculous osteomyelitis. It is reasonable to assume that maggot therapy should adequately debride tropical ulcer wounds as well, but the efficacy and safety of maggot debridement for these wounds remain undefined.
The wounds commonly seen in patients living with leprosy (caused by Mycobacterium leprae) are generally caused by trauma; the leprosy bacterium is not necessarily within the wound.81 These wounds should also respond to maggot therapy, if needed, just like any other traumatic wound.
Medicinal maggots have demonstrated antileishmania activity in vitro and in animal models,82-85 though no human studies have been reported. The endemic trepanematoses (i.e., yaws, pinta, and bejel) can also cause problematic soft-tissue wounds, but penicillin and several other readily available antibiotics are generally curative. No experience treating these lesions with maggot therapy has been published to date.
During a disaster or military conflict, the number of victims often overwhelms the capacity of first responders. This is the perfect opportunity to recruit fly larvae to assist in wound care.86 Often there are insufficient facilities or hospital beds, and unreliable electricity and water supplies. Again, maggot therapy is well suited to these trying circumstances because the larvae require none of those amenities. However, the supply chains for getting medicinal maggots to compromised healthcare settings are hitherto non-existent. Because maggots are highly perishable and cannot be stored for more than a day or two, attention needs to be paid to their production close to the point of care in disasters and conflict, or to reliable logistics solutions that ensure timely and safe delivery of medicinal maggots.87,88
People living in sparsely populated or medically underserved regions have all the same problems as described above, but often in different proportions. Wounds as a result of infectious and parasitic diseases, burns, and traumatic injury are common, as are increasingly wounds related to cancer, diabetes and cardiovascular disease. Again, maggot therapy is a great resource when there is a severe shortage of medical staff and other healthcare resources, provided that reliable supply chains exist to make maggot therapy accessible to these communities.
Death is a part of life whether in a rural part of the world or in a big city. Most people become ill or reach an older age before dying. With aging and chronic illness, organs (including skin) begin to fail. Skin failure is a common pre-terminal occurrence.89 As already noted, maggot therapy is a simple and effective means of treating necrotic, infected, or chronic wounds in the ill or frail person.90 Maggot therapy can quickly provide surgical-quality wound care, at home or in long-term/residential care, at a fraction of the cost of a surgeon, and be costeffective when compared to existing advanced
dressings that deliver only limited wound bed improvement.
Many treatment modalities are not available to persons with wounds depending on their particular age, gender, or both. For example, certain antibiotics and other pharmaceuticals should not be used in children or in childbearing women, or even in women of a particular (‘child-bearing’) age. Often this is the result of real or theoretical complications that have been observed in humans or in animal models. Other times it is simply because the studies supporting safety and efficacy were performed in populations that excluded these high-risk individuals. Maggot therapy does not need to be withheld from anyone on the basis of gender or age.31,91
Whether due to age or underlying medical illnesses, some people are unable to endure the physical or mental stress of aggressive medical interventions such as surgery, anaesthesia, or even frequent phlebotomy (needles). Even if their cardiopulmonary status is stable, an underlying problem such as hypertension, obesity, emphysema or sub-optimally managed diabetes may make surgery and/or anaesthesia excessively risky.92 These conditions are not contraindications to maggot therapy, because maggot therapy does not require general anaesthesia, and does not put any additional physical stress on the body.
Non-healing wounds are often seen in people when they are dying. When managing wounds that cannot heal, including in people who are dying, the focus of holistic management is to
optimise quality of life and to maintain optimal dignity. Maggot therapy can be of particular benefit if wounds are infected, foul-smelling, draining, painful, in need of much care and attention.
Maggot therapy controls the infection, debrides the necrotic tissue, and thereby diminishes or eliminates the drainage, odour and pain of a necrotic wound or terminal ulcer. Maggot therapy can provide comfort in these ways, without adding additional stress to a patient in their last days of life.77
Maggot therapy can be used safely and effectively even in people receiving other drugs and treatments. Medicinal maggots and their debridement efficacy appear to be unaffected by antibiotics,93,94 and most other drugs in pharmacologic doses, and various medical and life support interventions.56,95-97 In fact, maggots have proven to be safe and effective in patients receiving anticoagulants or intensive care that made surgical debridement unsafe.56,98 Unpublished anecdotal reports suggest that medicinal maggots may not survive on animals receiving systemic or topical insecticides, such as ivermectin or flea and tick treatments. No work has been published concerning the impact of cancer chemotherapy on medicinal maggots.
One of the most favourable aspects of maggot therapy is its flexibility regarding the care setting. Patients can be treated as in-patients, as outpatients, in the community, in field hospital situations, and even in the most austere healthcare settings that lack any medical resources.31,86,99 This is because the application of, and treatment with, medicinal maggot dressings does not require energy or sophisticated equipment. Maggots are also well-adapted to unhygienic environments
“Many treatment modalities are not available to persons with wounds depending on their particular age, gender, or both... Maggot therapy does not need to be withheld from anyone on the basis of gender or age.”31,91
and therefore will perform their therapeutic action equally well in the modern hospital environment, the battlefield, and the disaster zone.
The lack of stable shelter is not an impediment to using maggot therapy.86,99 Maggot therapy will still be effective, even if exposed to the elements, as long as the maggots receive enough air and the wounds are well-drained to prevent suffocation and drowning. Extreme climatic conditions should not be a deterrent either. In general, if the weather is tolerable to the patient, it will be tolerated by medicinal maggots.100,101 Wound temperatures encountered by medicinal maggots will depend on the body region, general condition of the patient and the environmental temperature, but will in most instances not be lower than 30℃ or exceed 40℃, which is a temperature range that promotes high activity and rapid growth in medicinal maggots.100,102 and lies well below the lethal temperature threshold of around 47°C.103 Environmental temperature is only a concern during transport of young medicinal maggots that are deprived of food until they reach the point of care and patient. To slow down activity and maintain optimal health, medicinal maggots should be kept at 6 to 25℃ and be applied to the wound within 48 hours of dispatch87. In other words, most limitations imposed on healthcare provision by the environment, facilities, or equipment will have little to no impact on the work of the maggots.
Social support systems are occasionally called into play to help with medical issues. In some parts of the world, patients are discharged to home while still recovering. Friends and family may need to assist in the care of their loved ones at home or in the hospital. Maggot therapy is simple enough that dressings can be applied, maintained, and/ or removed by the patient or the patient’s caregivers.104
Without financial resources, the purchase of specialised medical supplies can seem like an insurmountable problem.
Fortunately, medicinal maggots are not very costly to produce (except when regulatory agencies are involved). Many labs provide free or subsidised larvae to patients with limited finances. Some therapists procure larvae themselves when a commercial product is unavailable.99,105 Even when financial resources are sparse, maggot therapy remains a viable and cost-effective solution for wound care.
Moreover, the use and application of medicinal maggots requires no electricity, no batteries, no running or sterile water, and no refrigeration.86,99 Maggot dressings can be made from materials readily available at any facility that is modestly prepared to manage wounds (e.g., gauze and tape). While specialised or maggot-specific dressing supplies can simplify the application of maggot therapy, such amenities are not required.
While maggot therapy is not a panacea and will not resolve the underlying causes, particularly of chronic wounds, it is appropriate for the treatment of a wide variety of infected, necrotic, non-healing skin and soft-tissue wounds. Maggot therapy may also be used for acute wounds in need of urgent debridement, and non-necrotic wounds that simply will not close. In all of these situations, maggot therapy has proven to be very effective and relatively safe, at a low or reasonable cost. Maggot therapy can make a significant contribution to the treatment of people with wounds in disasters and armed conflict, in underserved populations, and in palliative care. With respect to patient characteristics, maggot therapy is also highly accommodating as it can be used to treat people of all ages, genders and levels of frailty.
Indeed, it should be a treatment of choice for debridement and wound maintenance where people are unfit to endure general anaesthesia or are at their end of life. Moreover, medicinal maggots can be deployed in both high- and lowresource care settings irrespective of healthcare infrastructure and hygiene levels as they do not require any special facilities, resources, or highlyskilled personnel. Table 2 provides a summary of the ideal wound dressing characteristics, and how maggot therapy compares favourably to that ideal.
Table 2: The degree to which maggot therapy compares with the ideal wound dressing.
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