Treatment with 24 h-delayed normo- and hyperbaric oxygenation in severe sepsis induced by cecal ligation and puncture in rats

Effects of postoperative hyperbaric oxygen therapy on hematological and biochemical parameters in patients diagnoses with pyometra in sepsis

The aim of this study was to evaluate the impact of hyperbaric oxygen therapy (HBOT) on hematologic and biochemical markers in dogs with pyometra in sepsis. Eighteen patients were equally distributed between the control group (CG) and the hyperbaric group (HG). All patients underwent ovariohysterectomy, supportive therapy, and insertion of a central venous catheter. HG attended three HBOT sessions (2 absolute atmospheres, 45 min) postoperatively. Blood tests were performed on admission, 1 h postoperatively, 24 h, 48 ​​h, and 72 h postoperatively. Both groups showed a significant reduction in red blood cells (Hm) and hematocrit (Hto) after surgery, but this effect was reversed after three HBO sessions and maintained in CG. Despite the initial reduction in hemoglobin (Hg) in HG, the values ​​increased again after the end of the protocol. A reduction of >50 % in leukocytes was noted in HG in the last evaluation in relation to the values ​​at admission. Significant reduction was also found for neutrophils, metamyelocytes and rods in HG. There was no difference in biochemical markers. HBO associated with OVH and supportive therapy can be considered in the treatment of pyometra, with rapid and marked improvement, after three sessions, in the e red blood cells and leukogram.

Early hyperbaric oxygen therapy improves survival in a model of severe sepsis

Sepsis is a major clinical challenge, with therapy limited to supportive interventions. Therefore, the search for novel remedial approaches is of great importance. We addressed whether hyperbaric oxygen therapy (HBOT) could improve the outcome of sepsis using an acute experimental mouse model. Sepsis was induced in male CD-1 mice by cecal ligation and puncture (CLP) tailored to result in 80-90% mortality within 72 h of the insult. After CLP, mice were randomized into two groups receiving HBOT or not at different times after the initial insult or subjected to multiple HBOT treatments. HBOT conditions were 98% oxygen pressurized to 2.4 atmospheres for 1 h. HBOT within 1 h after CLP resulted in 52% survival in comparison with mice that did not receive the treatment (13% survival). Multiple HBOT at 1 and 6 h or 1, 6, and 21 h displayed an increase in survival of >50%, but they were not significantly different from a single treatment after 1 h of CLP. Treatments at 6 or 21 h after CLP, excluding the 1 h of treatment, did not show any protective effect. Early HBO treatment did not modify bacterial counts after CLP, but it was associated with decreased expression of TNF-α, IL-6, and IL-10 expression in the liver within 3 h after CLP. The decrease of cytokine expression was reproduced in cultured macrophages after exposure to HBOT. Early HBOT could be of benefit in the treatment of sepsis, and the protective mechanism may be related to a reduction in the systemic inflammatory response.