Hyperbaric Medicine for Outpatient Wound Care

Hyperbaric oxygen therapy as adjuvant treatment for surgical site infections after male-to-female gender affirmation surgery: A ten-year experience

INTRODUCTION

Several urological conditions that share an impairment of tissue oxygenation can benefit from hyperbaric oxygen therapy (HBO), limited evidence is available on the impact of HBO in patients undergoing male-to-female (MtF) Gender Affirmation Surgery (GAS).

AIM

To evaluate the efficacy and safety of HBO as adjuvant treatment for surgical site infections in patients undergoing MtF GAS.

METHODS

This research was conducted as an observational retrospective study. Patients undergoing MtF GAS at the principal investigators' Institution from January 2009 to September 2019, with a discharge diagnosis of complicated superficial or deep wound infections, were included. All patients underwent standard management of wound infection. Subjects received HBO or not at the surgeon's discretion and were assigned to the HBO vs. non-HBO group accordingly. Complete wound healing rate (primary outcome), duration of antibiotic therapy, perineal drain time, bladder catheter time, and hospital stay were recorded. All adverse events that occurred during the study period were described.

RESULTS

A total of 156 patients underwent MtF GAS in the study period. Thirty-three patients were enrolled. Fifteen subjects belonged to the HBO group, the other 18 to the non-HBO group. No statistically significant differences were found between the two groups at baseline. Penile inversion vaginoplasty and intestinal vaginoplasty were performed in 9 (60%) and 6 (40%) patients of the HBO group. Only penile inversion vaginoplasty was performed in subjects of the non-HBO group. Complete wound healing was obtained in 15 patients (100%) of the HBO group and 17 patients (94.4%) of the non-HBO group (p = 0.35). Duration of antibiotic therapy, perineal drain time, bladder catheter time, and hospital stay were significantly lower in the HBO group (p<0.05).

CONCLUSION

Our preliminary data suggest a role of HBO as adjuvant treatment for surgical site infection in patients undergoing MtF GAS. Randomized controlled trials properly powered are needed to confirm our findings. This article is protected by copyright. All rights reserved.

Distraction Osteogenesis in Irradiated Rabbit Mandibles With Adjunctive Hyperbaric Oxygen Therapy

PURPOSE

The purpose of this study was to evaluate the effect of hyperbaric oxygen therapy on bone regeneration during distraction of irradiated rabbit mandibles.

MATERIALS AND METHODS

Twenty New Zealand white rabbits were randomly sub-divided into 4 groups. Group 1 served as control, group 2 received preoperative radiation therapy, group 3 received pre- and postoperative hyperbaric oxygen (HBO) therapy, and group 4 received preoperative radiation therapy and pre- and postoperative HBO therapy. All rabbits underwent a corticotomy of the left body of the mandible after placement of a distraction device. Distraction, at a rate of 1 mm/day and a rhythm of 1 turn/day, began after a 3-day latency period for 14 days. Thirty days after completion of the distraction protocol, the animals were euthanized, and histomorphometric and radiographic data of the distraction segments were obtained.

RESULTS

Histomorphometric analysis of new bone fill was greatest in the non-irradiated groups compared to groups receiving radiation therapy, regardless of HBO therapy (P = .03). Pre-corticotomy bone density measurements showed a significant increase in bone density over time (P = .0007). This resulted in a significant relationship between HBO therapy, radiation therapy, and time (P = .0050).

CONCLUSIONS

The results of the study support the use of HBO therapy during distraction osteogenesis. Any additional therapeutic benefit of HBO therapy in irradiated bone would require additional investigation.

Hyperbaric Oxygen for the Treatment of Interstitial Cystitis: Long-Term Results of a Prospective Pilot Study

OBJECTIVE

We conducted a prospective pilot study to assess the safety and efficacy of hyperbaric oxygen (HBO) for the treatment of interstitial cystitis (IC).

METHODS

Six patients underwent 30 sessions of 100% oxygen inhalation in a hyperbaric chamber and were followed up over 15 months. The measures of efficacy were changes in pain and urgency (visual analog scales), alteration in the patient's assessment of overall change in his well-being (Patient Global Assessment Form), and changes in frequency and functional bladder capacity (48-hours voiding log). Evaluation of symptom severity regarding pain and voiding problems was done using the O'Leary-Sant index.

RESULTS

Four patients rated the therapeutic result as either excellent or good and assessed their well-being after HBO treatment as improved. Two patients showed only short-term amelioration of some of their symptoms. At 12 months follow-up the baseline functional bladder capacity increased from 37-161 ml (range) to 160-200 ml in the responder group. The 24-hour voiding frequency decreased from 15-27 to 6-11 voids per day, a pain scale improvement from 20-97 mm at baseline to 3-30 mm at 12 months follow-up and an urgency scale improvement from 53-92 mm to 3-40 mm, respectively was observed at 12 month follow-up. The symptom and pain index score decreased from 23-35 at baseline to 3-17 at 12 months follow-up.

CONCLUSION

HBO appears to be effective to treat IC patients. Treatment was well tolerated and resulted in a sustained decrease of pelvic pain and urgency, improvement of voiding patterns and increase of functional bladder capacity for at least 12 months.

The use of hyperbaric oxygen in urology

PURPOSE

We review the use of hyperbaric oxygen therapy in urology, and present the mechanisms of hyperoxia action in whole body hyperbaric chamber treatments, patient outcomes and patient selection criteria.

MATERIALS AND METHODS

The literature on hyperbaric oxygen use in urology was reviewed.

RESULTS

Hyperbaric oxygen is a treatment alternative for patients with an underlying ischemic process unresponsive to conventional therapy. Specific factors which may influence patient selection of hyperbaric oxygen include cancer and absolute contraindications of active viral disease, intercurrent pneumothorax and treatment with doxorubicin or cisplatin. This technique is particularly useful in the treatment of intractable hemorrhagic cystitis secondary to pelvic radiation therapy. Further investigation of the efficacy of hyperbaric oxygen is warranted for patients with necrotizing fasciitis (Fournier's gangrene), posttraumatic ischemic injury and/or impaired wound healing.

CONCLUSIONS

Hyperbaric oxygen is a therapeutic alternative which complements the surgical and medical options for select patients.

War injuries of the crural arteries

Twenty-eight patients with military crural vascular injuries are presented. In the group undergoing immediate repair (21 patients), the time interval between trauma and surgery was 20 min to 30 h (mean 8 h 30 min). In those receiving delayed repair (seven patients), the interval between trauma and surgery was 3-47 (mean 14) days. Hyperbaric oxygenation therapy was used in conjunction with surgery and antibiotic therapy in 13 of the 28 patients. Explosive injuries were found in 14 patients and high-velocity missile injuries in nine; associated fractures were present in 20. Twenty of the 28 patients with crural vascular injuries had combined arterial and venous injuries, while eight had isolated arterial injuries. Twenty-five patients with distal ischaemia required arterial repair; five late amputations resulted. Military crural vascular injuries should be treated with soft tissue debridement, removal of foreign material, and microvascular arterial and concomitant vein reconstruction. This should be followed by external skeletal stabilization for bony and/or soft tissue instability, with fasciotomy for any associated compartment syndrome. The wound should be left open, with delayed closure or split skin grafting. It was felt that hyperbaric oxygen therapy reduced the amputation rate following combat-related crural vessel injuries.

Objectives to direct the training of emergency medicine residents on off-service rotations: hyperbaric medicine

Objectives for Emergency Medicine residents on Hyperbaric Medicine rotations is the 22nd article in this continuing series of "off-service" goals and objectives. The role of the emergency medicine physician in hyperbaric treatment is evolving as part of a multidisciplinary approach to patients with widely divergent disease states who may benefit from serum hyperoxia and compression. Therefore, emergency residents with interests in this area will benefit from clear goals and objectives during a 2 to 4-week Hyperbaric Medicine Elective.