Paradoxical herniation associated with hyperbaric oxygen therapy after decompressive craniectomy: A case report

BACKGROUND Whether hyperbaric oxygen therapy(HBOT)can cause paradoxical herniation is still unclear.CASE SUMMARY A 65-year-old patient who was comatose due to brain trauma underwent decompressive craniotomy and gradually regained consciousness after surgery.HBOT was administered 22 d after surgery due to speech impairment.Paradoxical herniation appeared on the second day after treatment,and the patient’s condition worsened after receiving mannitol treatment at the rehabilitation hospital.After timely skull repair,the paradoxical herniation was resolved,and the patient regained consciousness and had a good recovery as observed at the follow-up visit.CONCLUSION Paradoxical herniation is rare and may be caused by HBOT.However,the underlying mechanism is unknown,and the understanding of this phenomenon is insufficient.The use of mannitol may worsen this condition.Timely skull repair can treat paradoxical herniation and prevent serious complications.

The Effect of Different Hyperbaric Oxygen Treatment Time Windows on Neurological Function and Prognosis in Acute Cerebral Infarction

Objective:To observe the effects of different hyperbaric oxygen treatment time windows on the prognosis and neurological function of acute cerebral infarction.Method:160 patients with acute cerebral infarction admitted to Xiangyang Central Hospital in Hubei Province were randomly divided into four groups,each with 40 cases,using a random number table method.According to the 2017 guidelines for the treatment of cerebral infarction,the control group received routine treatment for acute cerebral infarction;On the basis of the control group,patients in Group A received hyperbaric oxygen therapy within 48 hours of onset;Group B patients receive hyperbaric oxygen therapy within 3-6 days of onset;Group C patients receive hyperbaric oxygen therapy within 7-12 days of onset.Observe the efficacy,recurrence,and neurological function recovery of four groups of patients after treatment.Result:There was no statistically significant difference in the National Institutes of Health Stroke Scale(NIHSS)and Barthel Index(BI)scores among the four groups before treatment(P>0.05).There were statistically significant differences in NIHSS and BI scores between 14 and 30 days after treatment and before treatment(F=16.352,27.261,11.899,28.326,P<0.05).At 14 and 30 days after treatment,the NIHSS score in Group A decreased compared to the control group,Group B,and Group C,while the BI score increased compared to the control group,Group B,and Group C,with statistical significance(P<0.05).There was no statistically significant difference in NIHSS and BI scores between Group C and the control group after treatment(P>0.05).After 30 days of treatment,the total effective rate of Group A was higher than that of the control group and Group C,and the difference was statistically significant(X2=6.135,P<0.05).The one-year recurrence rate of Group A and Group B is lower than that of Group C and the control group,and the difference is statistically significant(X2=8.331,P<0.05).There was no statistically significant difference in adverse reactions among the four groups(P>0.05).Conclusion:Patients with acute cerebral infarction who receive hyperbaric oxygen therapy within 48 hours can improve neurological function and reduce the recurrence rate.The efficacy of receiving hyperbaric oxygen therapy within 7-12 days of onset is equivalent to that of not receiving hyperbaric oxygen therapy.

Hyperbaric Oxygen Treatment for Long COVID:From Molecular Mechanism to Clinical Practice

Long COVID symptoms typically occur within 3 months of an initial COVID-19 infection,last for more than 2 months,and cannot be explained by other diagnoses.The most common symptoms include fatigue,dyspnea,coughing,and cognitive impairment.The mechanisms of long COVID are not fully understood,but several hypotheses have been put forth.These include coagulation and fibrosis pathway activation,inflammatory and autoimmune manifestations,persistent virus presence,and Epstein-Barr virus reactivation.Hyperbaric oxygen therapy(HBOT)is a therapeutic method in which a person inhales 100%oxygen under pressure greater than that of the atmosphere.HBOT has some therapeutic effects,including improvement of microcirculation,inhibition of cytokine release leading to a reduction in inflammatory responses,inhibition of autoimmune responses,and promotion of neurological repair.Several clinical trials have been carried out using HBOT to treat long COVID.The results suggest that HBOT helps to improve symptom severity,reduce symptom duration,and enhance patients’quality of life.It is believed that HBOT is an effective option for patients with long COVID,which is worth actively promoting.

Hyperbaric oxygen therapy as a complementary treatment for radiation proctitis:Useless or useful?-A literature review

Radiotherapy(RT)is the backbone of multimodality treatment of more than half of cancer cases.Despite new modern RT techniques,late complications may occur such as radiation proctitis(RP).The natural history of RP is unpredictable.Minor symptoms may resolve spontaneously or require conservative treatment.On the other hand,for similar and uncomplicated clinical contexts,symptoms may persist and can even be refractory to the progressive increase in treatment measures.Over the last decades,an enormous therapeutic armamentarium has been considered in RP,including hyperbaric oxygen therapy(HBOT).Currently,the evidence regarding the impact of HBOT on RP and its benefits is conflicting.Additional prospective and randomised studies are necessary to validate HBOT’s effectiveness in the‘real world’clinical practice.This article reviewed the relevant literature on pathophysiology,clinical presentation,different classifications and discuss RP management including a proposal for a therapeutic algorithm with a focus on HBOT.

Hyperbaric oxygen therapy improves cognitive functioning after brain injury

Hyperbaric oxygen therapy has been widely applied and recognized in the treatment of brain injury; however, the correlation between the protective effect of hyperbaric oxygen therapy and changes of metabolites in the brain remains unclear. To investigate the effect and potential mechanism of hy- perbaric oxygen therapy on cognitive functioning in rats, we established traumatic brain injury models using Feeney＇s free falling method. We treated rat models with hyperbaric oxygen therapy at 0.2 MPa for 60 minutes per day. The Morris water maze test for spatial navigation showed that the average escape latency was significantly prolonged and cognitive function decreased in rats with brain injury. After treatment with hyperbaric oxygen therapy for 1 and 2 weeks, the rats＇ spatial learning and memory abilities were improved. Hydrogen proton magnetic resonance spectroscopy analysis showed that the N-acetylaspartate/creatine ratio in the hippocampal CA3 region was sig- nificantly increased at 1 week, and the N-acetylaspartate/choline ratio was significantly increased at 2 weeks after hyperbaric oxygen therapy. Nissl staining and immunohistochemical staining showed that the number of nerve cells and Nissl bodies in the hippocampal CA3 region was significantly increased, and glial fibrillary acidic protein positive cells were decreased after a 2-week hyperbaric oxygen therapy treatment. Our findings indicate that hyperbaric oxygen therapy significantly im- proves cognitive functioning in rats with traumatic brain injury, and the potential mechanism is me- diated by metabolic changes and nerve cell restoration in the hippocampal CA3 region.

Hyperbaric oxygen treatment promotes neural stem cell proliferation in the subventricular zone of neonatal rats with hypoxic-ischemic brain damage

Hyperbaric oxygen therapy for the treatment of neonatal hypoxic-ischemic brain damage has been used clinically for many years, but its effectiveness remains controversial. In addition, the mechanism of this potential neuroprotective effect remains unclear. This study aimed to investigate the influence of hyperbaric oxygen on the proliferation of neural stem cells in the subventricular zone of neonatal Sprague-Dawley rats （7 days old） subjected to hypoxic-ischemic brain damage. Six hours after modeling, rats were treated with hyperbaric oxygen once daily for 7 days. Immunohistochemistry revealed that the number of 5-bromo-2＇-deoxyuridine positive and nestin positive cells in the subventricular zone of neonatal rats increased at day 3 after hypoxic-ischemic brain damage and peaked at day 5. After hyperbaric oxygen treatment, the number of 5-bromo-2＇- deoxyuddine positive and nestin positive cells began to increase at day 1, and was significantly higher than that in normal rats and model rats until day 21. Hematoxylin-eosin staining showed that hyperbaric oxygen treatment could attenuate pathological changes to brain tissue in neonatal rats, and reduce the number of degenerating and necrotic nerve cells. Our experimental findings indicate that hyperbaric oxygen treatment enhances the proliferation of neural stem cells in the subventricular zone of neonatal rats with hypoxic-ischemic brain damage, and has therapeutic potential for promoting neurological recovery following brain injury.

Neuroprotection of hyperbaric oxygen therapy in sub-acute traumatic brain injury:not by immediately improving cerebral oxygen saturation and oxygen partial pressure

Although hyperbaric oxygen （HBO） therapy can promote the recovery of neural function in patients who have suffered traumatic brain injury （TBI）, the underlying mechanism is unclear. We hypothesized that hyperbaric oxygen treatment plays a neuroprotective role in TBI by increasing regional transcranial oxygen saturation （rSO2） and oxygen partial pressure （PaO2）. To test this idea, we compared two groups： a control group with 20 healthy people and a treatment group with 40 TBI patients. The 40 patients were given 100% oxygen of HBO for 90 minutes. Changes in rSO2 were measured. The controls were also examined for rSO2 and PaO2, but received no treatment, rSO2 levels in the patients did not differ significantly after treatment, but levels before and after treatment were significantly lower than those in the control group. PaO2 levels were significantly decreased after the 30-minute HBO treatment. Our findings suggest that there is a disorder of oxygen metabolism in patients with sub-acute TBI. HBO does not immediately affect cerebral oxygen metabolism, and the underlying mechanism still needs to be studied in depth.

Hyperbaric Oxygen Treatment Improves Hearing Level via Attenuating TLR4/NF-κB Mediated Inflammation in Sudden Sensorineural Hearing Loss Patients

Objective Hyperbaric oxygen treatment(HBOT)has demonstrated efficacy in improving hearing levels of patients with idiopathic sudden sensorineural hearing loss(ISSHL);however,the underlying mechanisms are not well understood.HBOT alleviates the inflammatory response,which is mediated by Toll-like receptor(TLR)4 and nuclear factor(NF)-κB.In this study we investigated whether HBOT attenuates inflammation in ISHHL patients via alteration of TLR4 and NF-κB expression.Methods ISHHL patients(n=120)and healthy control subjects(n=20)were enrolled in this study.Patients were randomly divided into medicine group treated with medicine only(n=60)and HBO group receiving both HBOT and medicine(n=60).Audiometric testing was performed pre-and posttreatment.TLR4,NF-кB,and TNF-αexpression in peripheral blood of ISSHL patients and healthy control subjects was assessed by ELISA before and after treatment.Results TLR4,NF-κB,and TNF-αlevels were upregulated in ISSHL patients relative to healthy control subjects;the levels were decreased following treatment and were lower in the HBO group than that in the medicine group post-treatment(P<0.05 and P<0.01).Conclusion HBOT alleviates hearing loss in ISSHL patients by suppressing the inflammatory response induced by TLR4 and NF-κB signaling.

Changes of plasma C-reactive protein in patients with craniocerebral injury before and after hyperbaric oxygenation: A randomly controlled study

Changes of plasma C-reactive protein in patients with craniocerebral injury before and after hyperbaric oxygenation： A randomly controlled study BACKGROUND： Plasma inflammatory factor, such as C-reactive protein, whose content is regarded as a sensitively pathological marked protein and quantitative indexes of central nervous system injury, has been paid more and more attention in clinic. OBJECTIVE： To observe the effects and clinical significance of C-reactive protein in patients with craniocerebral injury after hyperbaric oxygenation. DESIGN： Randomized controlled study. SETTING： Departments of Neurosurgery, Laboratory and Hyperbaric Oxygen, the Second Affiliated Hospital, Medical College of Shantou University. PARTICIPANTS： A total of 60 patients with craniocerebral injury were selected from Department of Neurosurgery, the Second Affiliated Hospital, Medical College of Shantou University from October 2006 to April 2007. There were 37 males and 23 females and the mean age was 26 years. All subjects were certainly diagnosed as history of craniocerebral injury. Patients hospitalized at 24 hours after injury, Glasgow Coma Score ranged from 3 to 12 points, and all patients were certainly diagnosed with CT or MR scanning. Patients and their relatives provided confirmed consent. All the subjects were randomly divided into hyperbaric oxygenation group and control group with 30 in each group. METHODS： Patients in the control group were treated with routinely neurosurgical therapy after hospitalization; however, based the same basic treatment in the control group, patients in the hyperbaric oxygenation group received hyperbaric oxygenation by using iced-wheel four-door 2-cabin air-compression chamber （made in Yantai） from 24 hours to 10 days after operation or injury. After entering the cabin, patients who had a clear consciousness breathed the oxygen by using face mask; contrarily, patients directly breathed the oxygen. Therapeutic project： Expression was increased for about 15–20 minutes, maintained for about 70–80 minutes, and decreased for 20 minutes. Otherwise, pressure was maintained from 0.2 to 0.25 MPa. Hyperbaric oxygenation took an hour for once a day and 10 times were regarded as a course. Venous blood was collected before treatment and on the next day of the first course end. Content of C-reactive protein in plasma was measured with immune turbidimetry in hyperbaric oxygenation group; in addition, content of C-reactive protein in plasma was directly measured with the same method at the corresponding time in the control group. If the content was less or equal to 8 mg/L, it was regarded as normal value. Effects of the two groups were evaluated based on Glasgow Coma Score before and after treatment. MAIN OUTCOME MEASURES： Content of plasma C-reactive protein and Glasgow Coma Score in the two groups before and after treatment. RESULTS： All 60 patients were involved in the final analysis. ① Content of plasma C-reactive protein： The two contents were obviously higher than normal value after craniocerebral injury. There was no significant difference in the two groups before treatment （P 〉 0.05）, but both contents were decreased after treatment, and there was significant difference between HBOT group and control group after treatment （t =4.756, P 〈 0.01）. In addition, there was significant difference in hyperbaric oxygen therapy group before and after treatment （t =5.236, P 〈 0.01）. ② Glasgow Coma Score： There was no significant difference in the two groups before treatment （P 〉 0.05）, but scores were increased in both groups after treatment （t =9.92, 2.51, P 〈 0.01, 0.05）; on the other hand, therefore, there was significant difference between the two groupsafter treatment （t =9.21, P 〈 0.01）. CONCLUSION： Hyperbaric oxygenation can remarkably decrease content of plasma C-reactive protein in patients with craniocerebral injury at the phase of stress.

Hyperbaric oxygen therapy improves local microenvironment after spinal cord injury

Clinical studies have shown that hyperbaric oxygen therapy improves motor function in patients with spinal cord injury. In the present study, we explored the mechanisms associated with the recovery of neurological function after hyperbaric oxygen therapy in a rat model of spinal cord injury. We established an acute spinal cord injury model using a modification of the free-falling object method, and treated the animals with oxygen at 0.2 MPa for 45 minutes, 4 hours after injury. The treatment was administered four times per day, for 3 days. Compared with model rats that did not receive the treatment, rats exposed to hyperbaric oxygen had fewer apoptotic cells in spinal cord tissue, lower expression levels of aquaporin 4/9 mRNA and protein, and more NF-200 positive nerve fibers. Furthermore, they had smaller spinal cord cavities, rapid recovery of somatosensory and motor evoked potentials, and notably better recovery of hindlimb motor function than model rats. Our findings indicate that hyperbaric oxygen therapy reduces apoptosis, downregulates aquaporin 4/9 mRNA and protein expression in injured spinal cord tissue, improves the local microenvironment for nerve regeneration, and protects and repairs the spinal cord after injury.

Early hyperbaric oxygen therapy inhibits aquaporin 4 and adrenocorticotropic hormone expression in the pituitary gland of rabbits with blast-induced craniocerebral injury

In the present study, rabbits were treated with hyperbaric oxygen for 1 hour after detonator-blastinduced craniocerebral injury. Immunohistochemistry showed significantly reduced aquaporin 4 expression and adrenocorticotropic hormone expression in the pituitary gland of rabbits with craniocerebral injury. Aquaporin 4 expression was positively correlated with adrenocorticotropic hormone expression. These findings indicate that early hyperbaric oxygen therapy may suppress adrenocorticotropic hormone secretion by inhibiting aquaporin 4 expression.

Hyperbaric oxygen therapy combined with Schwann cell transplantation promotes spinal cord injury recovery

Schwann cell transplantation and hyperbaric oxygen therapy each promote recovery from spinal cord injury, but it remains unclear whether their combination improves therapeutic results more than monotherapy. To investigate this, we used Schwann cell transplantation via the tail vein, hyperbaric oxygen therapy, or their combination, in rat models of spinal cord contusion injury. The combined treatment was more effective in improving hindlimb motor function than either treatment alone; injured spinal tissue showed a greater number of neurite-like structures in the injured spinal tissue, somatosensory and motor evoked potential latencies were notably shorter, and their amplitudes greater, after combination therapy than after monotherapy. These findings indicate that Schwann cell transplantation combined with hyperbaric oxygen therapy is more effective than either treatment alone in promoting the recovery of spinal cord in rats after injury.

Combination of allopurinol and hyperbaric oxygen therapy:A new treatment in experimental acute necrotizing pancreatitis?

AIM： To investigate the individual and combined effects of allopurinol and hyperbaric oxygen （HBO） therapy on biochemical and histopathological changes, oxidative stress, and bacterial translocation （BT） in the experimental rat acute pancreatitis （AP）. METHODS： Eighty-five Sprague-Dawley rats were included in the study. Fifteen of the eighty-five rats were used as controls （sham, Group I ）. AP was induced via intraductal taurocholate infusion in the remaining seventy rats. Rats that survived to induction of acute necrotizing pancreatitis were randomized into four groups. Group H received saline, Group m allopurinol, Group IV allopurinol plus HBO and Group v HBO alone. Serum amylase levels, oxidative stress parameters, BT and histopathologic scores were determined. RESULTS： Serum amylase levels were lower in Groups Ⅲ, Ⅳ and v compared to Group H （974 ± 110, 384 ± 40, 851 ＋ 56, and 1664 Ⅳ 234 U/L, respectively, P 〈 0.05, for all）. Combining the two treatment optionsrevealed significantly lower median [25-75 percentiles] histopathological scores when compared to individual administrations （13 [12.5-15] in allopurinol group, 9.5 [7-11.75] in HBO group, and 6 [4.5-7.5] in combined group, P 〈 0.01）. Oxidative stress markers were significantly better in all treatment groups compared to the controls. Bacterial translocation into the pancreas and mesenteric lymph nodes was lower in Groups m, iV and v compared to Group H （54%, 23%, 50% vs 100% for translocation to pancreas, and 62%, 46%, 58% vs 100% for translocation to mesenteric lymph nodes, respectively, P 〈 0.05 for all）. CONCLUSION： The present study confirms the benefit of HBO and allopurinol treatment when administered separately in experimental rat AP. Combination of these treatment options appears to prevent progression of pancreatic injury parameters more effectively.

Umbilical cord-derived mesenchymal stem cell transplantation combined with hyperbaric oxygen treatment for repair of traumatic brain injury

Transplantation of umbilical cord-derived mesenchymal stem cells（UC-MSCs） for repair of traumatic brain injury has been used in the clinic. Hyperbaric oxygen（HBO） treatment has long been widely used as an adjunctive therapy for treating traumatic brain injury. UC-MSC transplantation combined with HBO treatment is expected to yield better therapeutic effects on traumatic brain injury. In this study, we established rat models of severe traumatic brain injury by pressurized fluid（2.5–3.0 atm impact force）. The injured rats were then administered UC-MSC transplantation via the tail vein in combination with HBO treatment. Compared with monotherapy, aquaporin 4 expression decreased in the injured rat brain, but growth-associated protein-43 expression, calaxon-like structures, and CM-Dil-positive cell number increased. Following combination therapy, however, rat cognitive and neurological function significantly improved. UC-MSC transplantation combined with HBO therapyfor repair of traumatic brain injury shows better therapeutic effects than monotherapy and significantly promotes recovery of neurological functions.

Hyperbaric oxygen preconditioning improves postoperative cognitive dysfunction by reducing oxidant stress and inflammation

Postoperative cognitive dysfunction is a crucial public health issue that has been increasingly studied in efforts to reduce symptoms or prevent its occurrence. However, effective advances remain lacking. Hyperbaric oxygen preconditioning has proved to protect vital organs, such as the heart, liver, and brain. Recently, it has been introduced and widely studied in the prevention of postoperative cognitive dysfunction, with promising results. However, the neuroprotective mechanisms underlying this phenomenon remain controversial. This review summarizes and highlights the definition and application of hyperbaric oxygen preconditioning, the perniciousness and pathogenetic mechanism underlying postoperative cognitive dysfunction, and the effects that hyperbaric oxygen preconditioning has on postoperative cognitive dysfunction. Finally, we conclude that hyperbaric oxygen preconditioning is an effective and feasible method to prevent, alleviate, and improve postoperative cognitive dysfunction, and that its mechanism of action is very complex, involving the stimulation of endogenous antioxidant and anti-inflammation defense systems.

Changes in brain function and anatomical structure following treatment of hyperbaric oxygen for visual pathway abnormalities in 16 cases Evaluation of functional magnetic resonance imaging combined with diffusion tensor imaging

BACKGROUND： There is a growing research focus on the combination of blood oxygenation level dependent functional magnetic resonance imaging （BOLD-fMRI） and diffusion tensor imaging （DTI） to evaluate visual cortical function and structural changes in the cerebrum, as well as morphological changes to the white matter fiber tracks, after visual pathway lesions. However, the combined application of BOLD-fMRI and DTI in treating of visual pathway abnormalities still requires further studies. OBJECTIVE： To observe and evaluate the effects of hyperbaric oxygen on visual pathway abnormalities, and to evaluate the characteristics of cerebral function and anatomic structural changes by using BOLD-fMRI combined with DTI technique. DESIGN： Case contrast observation. SETTING： Fuzhou General Hospital of Nanjing Military Area Command of Chinese PLA. PARTICIPANTS： Sixteen patients （9 males and 7 females, 15-77 years old） with lateral or bilateral visual disorder induced by visual pathway lesions were selected from the Department of Neurology, Fuzhou General Hospital of Nanjing Military Area Command of Chinese PLA from January 2006 to May 2007. These patients comprised the lesion group. Measures of interventional therapy： hyperbaric oxygen of two normal atmospheres for three courses （10 d/course） and routine internal medicine treatment. In addition, 12 healthy subjects of similar sex and age to the lesion group were regarded as the control group. The control group underwent routine ophthalmological and ocular fundus examinations; diagnostic results were normal. The experiment received confirmed consent from the local ethic committee, and all patients provided informed consent. METHODS： BOLD-fMRI and DTI manifestations in the lesion group were observed before and after hyperbaric oxygen intervention, and the results were compared with the control group. The subjects were positioned on their back, and BOLD-fMRI images were collected with the following GRE EPI sequence： TR = 2 000 ms, TE = 40 ms, layer thickness = 5 mm, and 20-layer successive scanning to cover the whole brain. While, DTI images were collected with SE EPI sequence of single excitation： TR=10 000 ms, TE = 112 ms, layer thickness = 4 mm, layer spacing = 0.5 mm, and a 30-layer successive scanning, matrix = 128×128. A diffusion gradient was applied at 13 directions, and one layer without diffusion weighted imaging was collected at b =1 000 s/mm^2. Numbers of activated voxels in cortical-activated regions, and fractional anisotropy in bilateral cerebral optical radiation regions, were calculated. Displacement, continuity, and destruction of fibrous tracts were analyzed. MAIN OUTCOME MEASURES： Results of BOLD-fMRI and DTI examinations. RESULTS： All 16 patients and 12 controls were included in the final analysis. ① Numbers of activated voxels through the use of BOLD-fMRI： prior to hyperbaric oxygen therapy, the number of activated voxels in the bilateral cortex of occipital lobe were significantly less in the lesion group than in the control group （t =3.23, P 〈 0.01）. In addition, the number of activated voxels significantly increased after treatment compared to before treatment （t = 2.46, P 〈 0.05）. ② Fractional anisotropy in optical radiation regions of bilateral cerebrum： fractional anisotropy in the lesion group was significantly less than the control group （t =2.89, P 〈 0.05）. In addition, fractional anisotropy after treatment was significantly higher than before treatment （t = 2.48, P 〈 0.05）. Moreover, fractional anisotropy of optical neuropathy was significantly higher in 6 patients in the lesion group than the occipital lobe optical central lesion （t = 2.35, P 〈 0.05）. CONCLUSION： BOLD-fMRI combined with DTI can indicate the occurrence, development, and therapeutic course of action for optical pathway lesions. The results acquired from these methods can provide information for function and structure, which can provide reliable verification in the treatment of cerebral function.

Effects of hyperbaric oxygen on intestinal mucosa apoptosis caused by ischemia-reperfusion injury in rats

BACKGROUND:Hyperbaric oxygen(HBO)is an effective adjuvant therapy for ischemiareperfusion(I/R)injury of the brain,small intestine and testis in addition to crushing injury.Studies have shown that HBO increases the activity of villi of the ileum 30 minutes after I/R injury.The present study aimed to observe the effect of HBO on apoptosis of epithelial cells in the small intestine during different periods of I/R and to elucidate the potential mechanisms.METHODS:Rats were subjected to 60-minute ischemia by clamping the superior mesenteric artery and 60-minute reperfusion by removal of clamping.The rats were randomly divided into four groups:I/R group,HBO precondition or HBO treatment before ischemia(HBO-P),HBO treatment during ischemia period(HBO-I),and HBO treatment during reperfusion(HBO-R).After 60-minute reperfusion,samples of the small intestine were prepared to measure the level of ATP by using the colorimetric method and immunochemical expression of caspase-3.The levels of TNF-αin intestinal tissue were measured using the enzyme-linked immunosorbent assay method(Elisa).RESULTS:TNF-αlevels were significantly lower in the HBO-I group than in the HBO-P(P<0.05),HBO-R and I/R groups;there was no significant difference between the HBO-R and I/R groups(P>0.05).The expression of caspas-3 was significantly lower in the HBO-I group than in the HBO-P group(P<0.05);it was also significantly lower in the HBO-P group than in the I/R and HBO-R groups(P<0.05).ATP level was significantly lower in the HBO-I group than in the HBO-P group(P<0.05),and also it was significantly lower in the HBO-P group than in the I/R and HBO-R groups(P<0.05).CONCLUSIONS:There is an association between HBO,small intestinal I/R injury,and mucosa apoptosis.HBO maintains ATP and aerobic metabolism,inhibites TNF-αproduction,and thus prevents intestinal mucosa from apoptosis.Best results can be obtained when HBO is administered to patients in the period of ischemia,and no side effects are produced when HBO is given during the Period of Reperfusion.

Hyperbaric oxygen therapy as a new treatment approach for Alzheimer's disease

Hyperbaric oxygen therapy as a new treatment approach for Alzheimer’s disease（AD）：Alongside the increase in life expectancy,the prevalence of age-related disorders,such as neurodegenerative diseases,is on the rise.For example,AD,the most common form of dementia in the elderly,accounts for 60–80%of all dementia cases.

Hyperbaric oxygen therapy and chemokine administration - a combination with potential therapeutic value for treating diabetic wounds

Non-healing wounds impart serious medical problems to people with diabetes.Amongst 15%of diabetic patients,the incidence of foot ulcer is the most prevailing,which confers a significant risk of limb amputation,mainly due to hypoxia and impairment in cell signaling.Alteration in the expression of chemokines and the related factors in diabetic conditions delays the recruitment of different cell types,including fibroblasts,keratinocytes,and immune cells such as macrophages to the site of injury,further impairing neovasculogenesis,reepithelialization,and extracellular matrix formation.Thus,proper activation of effector cells through an accurate signal pathway is necessary for better therapeutic application.Hyperbaric oxygen therapy(HBOT)is the current treatment prescribed by medical practitioners,shown to have increased the wound healing rate by reducing the need for significant amputation among the diabetic population.However,the risk of morbidity associated with HBOT needs complete attention through rigorous research to avoid adverse outcomes.Altering the level of pro-angiogenic chemokines may regulate the inflammatory response,further promote vascularization,and enhance the complete healing of wounds in diabetic patients.Thus,a combination of better therapeutic approaches could pave the way for developing a successful treatment for diabetic foot and wound healing.

The mechanism by which hyperbaric oxygen treatment alleviates spinal cord injury: genome-wide transcriptome analysis

Accumulating studies have demonstrated that hyperbaric oxygen(HBO)treatment alleviates spinal cord injury(SCI).However,the underlying mechanism by which HBO alleviates SCI remains to be elucidated.In this study,we performed genome-wide transcriptional profiling of the spinal cord between SCI mice and mice that received HBO treatment by high-throughput RNA sequencing at 1 week after SCI.We also compared genome-wide transcriptional profiles from SCI mice and sham-operated mice.We found 76 differentially co-expressed genes in sham-operated mice,SCI mice,and HBO-treated SCI mice.Using Gene Ontology and Kyoto Encyclopedia of Genes and Genomes enrichment analysis,we identified the biological characteristics of these differentially expressed genes from the perspectives of cell component,biological process,and molecular function.We also found enriched functional pathways including ferroptosis,calcium signaling pathway,serotonergic synapse,hypoxia-inducible factor-1 signaling pathway,cholinergic synapse,and neuroactive ligand-receptor interaction.We performed quantitative reverse transcription-polymerase chain reaction and validated that HBO treatment decreased the expression of Hspb1(heat shock protein beta 1),Hmox1(heme oxygenase 1),Ftl1(ferritin light polypeptide 1),Tnc(tenascin C)and Igfbp3(insulin-like growth factor binding protein 3)and increased the expression of Slc5a7(solute carrier family 5 choline transporter member 7)after SCI.These results revealed the genome-wide transcriptional profile of the injured spinal cord after HBO treatment.Our findings contribute to a better understanding of the mechanism by which HBO treats SCI and may provide new targets for SCI intervention.