Effectiveness of hyperbaric oxygen and ozone applications in tissue healing in generated soft tissue trauma model in rats: an experimental study.

BACKGROUND: Soft tissue trauma is a type of acute traumatic ischemia. We investigated in this study whether the edema, inflammation and ischemia caused by the trauma could be affected positively by hyperbaric oxygen (HBO) and ozone therapy. METHODS: Soft tissue trauma was generated in a total of 63 adult male Sprague-Dawley rats. Subsequently, rats were divided into three groups. The first group was treated with ozone, the second group with HBO, and the third group served as controls. Tissue and blood samples were taken at the end of the procedures. Tissue lipid peroxidation (LPO), superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), inducible nitric oxide synthase (iNOS), heme oxygenase (HO)-1, and hypoxia-inducible factor (HIF)-1 levels were detected. Hematoxylin-eosin staining was used to determine the inflammation and edema histopathologically. RESULTS: We also detected HIF-1 activity, which decreases when the oxygen concentration increases, HO-1 activity, which has anti-inflammatory effects, and iNOS activity, which releases in any type of acute case. We determined a statistically significant reduction in iNOS and LPO levels in both the HBO and Ozone groups. A significant decrease in inflammation was detected in both the Ozone and HBO groups compared with the Control group, and a significant decrease in edema was detected in all three groups. CONCLUSION: We think that HBO and Ozone therapy have beneficial effects on biochemical and histopathological findings. Related clinical trials will be helpful in clarifying the effects.

Effect of hyperbaric oxygen treatment in a rat model of abdominal aortic aneurysm.

Matrix metalloproteinase (MMP) plays a pivotal role in the pathophysiology of abdominal aortic aneurysms (AAA). Experimental studies have demonstrated that hyperbaric oxygen (HBO2) therapy decreases MMP levels in different tissues. However, the effect of HBO2 therapy on AAA has yet to be investigated. This study aimed to examine the effects of HBO2 on MMPs in an experimental AAA model. The model was implemented with CaCl2 in 12-week-old male Wistar albino rats. The rats were randomized into four groups: Group I: received NaCl (n = 6) (Sham group); Group II: received NaCl and were treated with HBO2 (n = 6); Group III: received CaCl2 (n = 6); and Group IV: received CaCl2 and were treated with HBO2 (n = 6). HBO2 therapy was applied for five of seven days over a period of six weeks. Although in the CaCl2 groups, aortic diameters were significantly higher than the NaCl groups (p < 0.05), there was no difference between pre- and post-HBO2 in the CaCl2 groups (p > 0.05). In the CaCl2 group, the MMP-2 and MMP-9 levels were significantly higher than those in the NaCl group (p < 0.05). HBO2 therapy had no statistically significant effect on the MMP-2 and MMP-9 levels in Groups III and IV. However, it was observed that both levels clearly decreased in Group IV. In conclusion, the study suggested that HBO2 may have favorable effects on MMP levels.

Hyperbaric oxygen therapy alleviates oxidative stress and tissue injury in renal ischemia/reperfusion injury in rats.

Hyperbaric oxygen (HBO) therapy has been shown to attenuate renal ischemia/reperfusion (I/R) injury in rats, when applied in the early reperfusion period. The aim of this study was to elucidate possible beneficial effects of HBO therapy on renal I/R injury, when applied 24 h after ischemia. Rats were randomized into three groups: (1) control group (n = 20), (2) I/R group (n = 20), and (3) I/R + HBO group (n = 20). Renal I/R injury was created by interrupting renal blood flow for 30 min with a non-traumatic vascular clamp. HBO therapy was administered 24 h after I/R injury and continued for 5 days. At the end of the study, rats were sacrificed under anesthesia, blood was drawn, and right kidneys were harvested for analysis. Renal I/R injury increased serum and tissue malondialdehyde (MDA) levels and reduced superoxide dismutase (SOD) and glutathione peroxidase (GPx) levels. HBO therapy attenuated MDA levels by increasing SOD and GPx activities. HBO therapy also prevented neutrophil infiltration and tissue injury in kidneys. Taken together, HBO therapy has been found to be effective in the delayed period of I/R injury.

Evaluation and comparison of the effects of hyperbaric oxygen and ozonized oxygen as adjuvant treatments in an experimental osteomyelitis model.

BACKGROUND: We evaluated and compared the efficacy of ozone (O(3)) and hyperbaric oxygen (HBO) therapies in an experimental rat model of osteomyelitis. MATERIALS AND METHODS: Forty-eight male Sprague-Dawley rats were divided into sham, osteomyelitis (control), vancomycin (V), vancomycin + HBO (VHB), vancomycin + O(3) (VO), and vancomycin + HBO + O(3) (VOHB) groups. Osteomyelitis was induced by a bone injection of 10(8) CFU/mL methicillin-resistant Staphylococcus aureus. HBO was administered daily at 2.8-atm pressure for 90 min; O(3) therapy was provided as intraperitoneal injections of 0.7 mg/kg O(3)/O(2) gas mixture once daily. Treatments were continued from d 7 to 21 after induction of osteomyelitis. Bone tissues and blood samples were harvested for biochemical, histopathologic, and microbiologic analyses. RESULTS: Rats in the sham, VO, and VOHB groups gained weight but those in the control, V, and VHB groups did not. Levels of malondialdehyde, superoxide dismutase, and glutathione peroxidase were lower in the VHB, VO, and VOHB groups than in V and control groups. Levels of interleukin-10 and -1ß and tumor necrosis factor-α were decreased in the VHB, VO, and VOHB groups; transforming growth factor-ß was increased in these groups compared with V and control groups (P ≤ 0.001). Bacteria counts in VOHB were significantly lower than those in group of V (P = 0.012). Histopathologic scores in group VO were significantly lower than those in group V (P = 0.046). CONCLUSIONS: O(3) was as effective as HBO in decreasing oxidative parameters and inflammatory cytokines. Rats in the VO and VOHB groups gained more weight than did the other groups. Bacteria counts were significantly decreased in group VOHB compared with the other groups. Histopathologic scores in group VO were significantly decreased compared with the other groups.