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Hyperbaric Oxygen Therapy Fof 2Nd Degree Burns

Medical information reviewed by: RAMONA HOTNOG , Kinetoterapeut
i.php?p=14. Terapia hiperbara in tratame

Discover the hyperbaric medicine center opened in our clinic. Centrokinetic has the top-performing hyperbaric chamber in Bucharest, with multiple medical and anti-aging uses. The Baroks chamber has 5 seats, and operates at a constant pressure of 2.5 atmospheres, being fully automated and having protocols for each condition, and can be used individually for each patient. 

Hyperbaric oxygen therapy - benefits

Patients who use the clinic's hyperbaric therapy services benefit from:

  • The only medically accredited hyperbaric therapy chamber in Bucharest, which operates at 2.5 atmospheres (those for aesthetic use go to 1 atmosphere and have no medical benefits).
  • A safe medical procedure, without irradiation, without pain, without other side effects. 
  • The specialized medical team consists of recovery doctors, orthopedists, rheumatologists, neurologists, and neurosurgeons, meaning a multidisciplinary team specialized in all diseases that can be treated with hyperbaric therapy. 
  • Premium conditions at a fair price. Our clinic is recognized for the conditions offered and for the care of each patient. But we do not need to pay exorbitant prices to have access to quality medical services. At Centrokinetic you can find an affordable and fair price. But note that we do not have a contract with the National Health Insurance House (we do not offer state reimbursed services)

Centrokinetic is keeping contact with prestigious clinics and universities in Belgium, the Netherlands, France, and Greece to constantly update treatments to provide patients with the best medical solutions.

Wound healing process

The wound healing process includes inflammation, proliferation, and remodeling phases, the main features of which are inflammation, neoangiogenesis, and epithelialization. Hyperbaric oxygen therapy (HBOT) is one modality postulated to improve wound healing. The objective of this study was to determine whether HBOT could improve selected features of burn wound healing in an experimental rabbit model.

Researchers conducted an experimental study with 36 rabbits given second-degree burns. Subjects were separated into two groups: a control group (n = 18) and an intervention group that was given HBOT at 2.4 atmospheres absolute for 6 days (n = 18). The main outcome measure was wound healing.

Compared with the control group, the HBOT group showed more robust inflammatory cells (P = .025) and epithelialization (P = .024), but no significant difference in angiogenesis (P = .442). The authors conclude that HBOT may improve second-degree burn healing by increasing inflammatory cell migration and re-epithelialization.

Introduction

Burns are among the most devastating skin injuries, requiring complex management and accompanied by high morbidity and mortality. Acute thermal injuries requiring medical treatment affect nearly half a million Americans each year, with approximately 40,000 hospitalizations and 3,400 deaths. Hyperbaric oxygen therapy (HBOT) is the use of 100% oxygen at pressures greater than atmospheric pressure.

The patient breathes 100% oxygen intermittently while the pressure of the treatment chamber is increased to greater than 1-atmosphere absolute (ATA). The treatment of burn wounds with HBOT was first investigated in the mid-1960s and gained attention in the decades following, but controversy remains over potential risks and costs. Recent work in rat models has shown that HBOT reduces the healing time and improves scar appearance of burn injuries. Advancements in hyperbaric chambers have reduced the overall cost associated with treatment, and controlled clinical trials in humans are beginning to produce data supporting the conclusion that HBOT is safe and effective for improving burn wound healing.4,5

The postulated mechanisms of HBOT with a beneficial effect on burn wounds include decreased edema formation because of hyperoxic vasoconstriction, increased collagen formation from accelerated glycosaminoglycan synthesis and hydroxylation, and improved phagocytic killing of bacteria with normoxia/hyperoxia.6 Further, HBOT may decrease morbidity, lessen the need for surgery (especially for second-degree burns), and reduce hospital lengths of stay. However, this modality is still not uniformly accepted.

The authors decided to conduct an experimental animal study to strengthen the evidence for HBOT especially in the treatment of second-degree burns. The purpose of the study was to assess the effects of HBOT on second-degree burn injury inflicted on rabbits in terms of inflammatory cell migration, angiogenesis, and epithelialization.

This experimental study was approved by the Ethical Committee for Biomedical Research at the Universitas Sam Ratulangi, Manado, Indonesia. The data sets generated and/or analyzed during this study are available from the first author upon request.

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Methods

This study involved 36 male rabbits from New Zealand, with an average weight of 1,200 to 1,400 g and kept in a quarantine area. A burn injury with a partial thickness (grade 2) of 2 × 1 cm appeared on the back of the subjects under general anesthesia using intramuscular administration of ketamine (100 mg/kg body weight) as an anesthetic. Anesthetized animals were exposed to direct flame for 5 to 7 seconds through a 1.5 × 1.5 cm window in an asbestos net.

Subjects were randomly assigned to two groups, 18 rabbits each. Group A (intervention group) received HBOT therapy in 90-minute sessions at 2.4 ATA for 6 consecutive days, while group B (control group) did not receive any treatment except surface Vaseline ointment. wound. On day 14, all subjects were euthanized, and the burn area was excised and sent to the pathology laboratory for histological examination. Standard tissue elements were prepared and stained with hematoxylin-eosin.

Histological outcome tests included inflammatory cell count, angiogenesis, and epithelialization. Angiogenesis was determined by counting the number of blood vessels per mm 2. All the microscopic measurements were performed by an independent pathologist.

What are the effects of oxygen therapy on the body?

  • Decreases inflammation
  • Increases the body's oxygen saturation by 20-30%
  • Increases the body's immunity
  • Increases blood circulation and stimulates the formation of new capillaries
  • Decreases toxins in the body
  • Stimulates the production of new blood cells
  • Increases healing rate
To evaluate the inflammation, stained and mounted sections of hematoxylin-eosin and CD68 (a monocyte/macrophage marker) were scanned for virtual microscopy at 40× magnification. Subsequently, using virtual microscopy software NDP (Hamamatsu Photonics, Hamamatsu City, Japan), JPEG images of all sections except those stained with hematoxylin-eosin were taken at 2.5× magnification (10× digital zoom) and loaded into CellD software (Olympus Life Science, Hamburg, Germany) for computerized quantitative analysis. Thresholds for the number of pixels, hue, saturation, and intensity were set and verified by the human eye.

Angiogenesis was examined by microvessel density using an established, validated protocol. Seven areas with the highest density of microvessels (vascular hotspots) were identified at low magnification of the stained sections using a light microscope. Within these areas, individually stained microvessels were counted at 400× magnification using a square grid graticule resulting in a field size of 0.0625 mm2. Transglutaminase-stained positive endothelial cells or endothelial cell clusters separated from microvessels and connective tissue elements were considered single countable microvessels; branching structures with continuity of the vessel were counted as one. In cases of discontinuity, structures were counted as two distinct vessels. Three fields per defect section were counted in the vascular hot-spots. Microvessel density was defined as the mean score from all three fields per mm2.

The epithelialized area was quantified by computerized morphometry. The burn areas were photographed at a fixed focus distance, using identical lighting on each occasion. A Minolta SRT MC-II camera (Konica Minolta, Tokyo, Japan) mounted on a stand and fitted with a 100-mm macro-objective lens, together with a uniform batch of AGEA 100 ASA color film, was used. The epithelialization areas were marked, and the photographs were then converted into a digital display using a computerized morphometric analysis system, and the wound area and areas of epithelialization were quantified (Image Measure Software; Phoenix Corporation, Seattle, Washington).

A Kolmogorov-Smirnov test was applied to determine if the two data sets were normally distributed.

Results

All subjects completed the 14 days of observation and were euthanized. Histologic examination showed that group A (HBOT) had fewer inflammatory cells and angiogenesis and had more epithelialization compared with the control group (Table).

The Kolmogorov-Smirnov test showed that the data were not normally distributed, so the differences between the two groups were analyzed with a Mann-Whitney U-test. There were significant differences between groups A and B in terms of inflammatory cells (P = .025) and epithelialization (P = .024; Figure), whereas there was no significant difference for angiogenesis (P = .442).

Discussion

Burns are classified by depth into superficial (epidermal), partial-thickness, and full-thickness burns. The tissue damage is not just caused by the inciting event alone; prolonged inflammation results in an accumulation of cytotoxic cytokines and free radicals, along with neutrophil plugging of dermal venules. Increased vascular permeability and interstitial hydrostatic pressure augmentation lead to edema with vascular congestion. Hypercoagulability with thrombosis further impairs blood flow, whereas oxidative stress damages endothelial cells and compromises vascular patency. The main burden is a failure of oxygen and nutrient supply to injured cells.

A number of studies have investigated the utility of various agents in modulating the mechanisms of burn wound progression. During HBOT, oxygen pressures higher than 1 ATA will increase the O2 gradient pressure to promote oxygen diffusion into tissue. Oxygen may also dissolve in plasma and may reach oxygen-deficient tissue through macro- and microcirculation.

i.php?p=5. Terapia hiperbara in ischemia

Inflammatory cell reduction

The number of inflammatory cells decreased after HBOT. A previous study by Thom12 showed that 2.8- to 3-ATA HBOT mediated inhibition of neutrophil β2 integrin adhesion. An early event associated with postischemic tissue reperfusion is the adherence of circulating neutrophils to vascular endothelium by β2 integrins. When animals or humans are exposed to hyperbaric oxygen for at least 45 minutes, the ability to circulate neutrophils to adhere to target tissues is temporarily inhibited, therefore, reducing the number of inflammatory cells within the wound cavity. This hyperbaric oxygen-mediated inhibition of neutrophil β2 integrin adhesion also has been shown to ameliorate reperfusion injuries.

The dose of oxygen pressure in this study was 2.4 ATA. This is lower than Bilic et al6(2.5 ATA) and other studies, where the range of pressure was between 2 to 3 ATA; however, this lower dose showed the same effect in terms of the number of inflammatory cells within the wound cavity. Future HBOT studies may explore the optimal cut-off point for hyperbaric dosing based on this finding.

Theoretically, HBOT does not inhibit neutrophil antibacterial function because the G protein-coupled “inside-out” pathway for activation (such as that triggered by endotoxin) remains intact, and actin S-nitrosylation is reversed as a component of this activation process. Although many fear that HBOT may temporarily inhibit the adherence of circulating neutrophils to target tissues, resulting in immunocompromise, the most compelling evidence comes from studies in sepsis models, where HBOT has a beneficial effect. A separate anti-inflammatory pathway for HBOT also involves impaired proinflammatory cytokine production by monocyte macrophages. This action has been shown in animal models and human beings.17,18 The effect on monocytes may be the basis for reduced levels of circulating pro-inflammatory cytokines under stress conditions.

Decreased Angiogenesis

Regional angiogenic stimuli influence the efficiency of new blood vessel growth by local endothelial cells (termed angiogenesis), and these cells stimulate the recruitment and differentiation of circulating stem/progenitor cells to form new vessels (vasculogenesis). It is posited that HBOT has beneficial effects on these processes. Various studies with macrophages in culture, in wound fluid, using rat models, and in human volunteers have shown that HBOT increases active vascular endothelial growth factor (VEGF) production. There are various proposed mechanisms for how HBOT does so. One mechanism simply involves the correction of wound hypoxia. As part of the hemostatic process of wound healing, capillaries vasoconstrict, which increases the diffusion distance that oxygen must traverse to reach the endothelial cells. Given that VEGF requires oxygen, the greater diffusion distance decreases the amount of oxygen available to VEGF. The efficacy of HBOT is in the increase in oxygen partial pressure gradients between healthy and hypoxic tissues.

Increased epithelialization

Hyperbaric oxygen therapy theoretically influences the epithelialization of second-degree burns by minimizing the destructive effect of hypoxia and encouraging a faster rate of mitosis of epithelial cells and cell migration to the wound cavity. In practice, however, previous studies have established conflicting results about whether HBOT increases the rate of epithelialization in second-degree burns. Korn et al. stated that epithelial cells may survive without oxygen for a while, but cannot divide and migrate. It is possible that HBOT increases the oxygenation of hypoxic tissue that may not survive without additional oxygen during ischemia. The present study demonstrated faster epithelialization in the intervention group versus the control group, which supports the conclusion that adequate oxygen is mandatory for wound healing.

Limitations and recommendations for future research

Angiogenesis begins during the proliferation phase, which can continue for up to 3 weeks after injury. However, this study revealed no significant difference in angiogenesis between the HBOT and control groups. This may be because the rabbits were euthanized after 14 days when the proliferation phase was still in progress. It is possible that a study conducted for a longer period of time would result in significant differences.

More trials to assess the clinical efficacy of HBOT in humans are needed to determine the optimum dose of ATA and how many sessions are needed. Like any medical therapy, the risk and benefits of HBOT must be carefully weighed. An untreated pneumothorax is the only absolute contraindication to HBOT.

Conclusions

These results show that HBOT has a beneficial effect on burn wound healing by reducing edema and ensuring there is adequate oxygen in microcirculation. It may speed up epithelialization and suppress unnecessary inflammation that could negatively affect normal wound healing. With further research, HBOT may become an adjuvant therapy to surgery.

IN CASE YOU HAVEN'T ALREADY HEARD ABOUT US

Centrokinetic is the place where you will find clear answers and solutions for your motricity problems. The clinic is dedicated to osteoarticular diseases and is divided into the following specialized departments:

  • Orthopedics , a department composed of an extremely experienced team of orthopedic doctors, led by Dr. Andrei Ioan Bogdan, primary care physician in orthopedics-traumatology, with surgical activity at Medlife Orthopedic Hospital, specialized in sports traumatology and ankle and foot surgery. .
  • Pediatric orthopedics , where children's sports conditions are treated (ligament and meniscus injuries), spinal deformities (scoliosis, kyphosis, hyperlordosis) and those of the feet (hallux valgus, hallux rigidus, equine larynx, flat valgus, hollow foot).
  • Neurology , which has an ultra-performing department, where consultations, electroencephalograms (EEG) and electromyography (EMG) are performed. 
  • Medical recovery  for adults and  children , department specialized in the recovery of performance athletes, in spinal disorders, in the recovery of children with neurological and traumatic diseases. Our experience is extremely rich, treating over 5000 performance athletes.
  • Medical imaging , the clinic being equipped with ultrasound and MRI, high-performance devices dedicated to musculoskeletal disorders, and complemented by an experienced team of radiologists: Dr. Sorin Ghiea and Dr. Cosmin Pantu, specialized in musculoskeletal imaging.

Find the latest news by following the Facebook and YouTube accounts of the Centrokinetic clinic.  

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