Hyperbaric oxygen for persistent post-concussive symptoms: long-term follow-up.

We report results of an observational cohort study investigating long-term follow-up in participants from two completed United States military trials of hyperbaric oxygen (HBO2) for persistent post-concussive symptoms (PCS), as well as challenges in recruitment and retention in active-duty military personnel. After informed consent, participants completed an electronic survey assessing PCS, post-traumatic stress disorder (PTSD), anxiety, depression and quality of life. Of 132 HBO2 study participants, 40 (30%) completed the survey (42 could not be contacted; 50 were lost to follow-up or declined). All were male, age 28.1 ±6.6 years (mean ±1SD). Time to follow-up was 39.2 ±6.1 months. At follow-up, participants reported continued symptoms of PTSD, depression, anxiety and reduced quality of life. Among DARPA/VCU study participants, total PCS scores worsened in the 1.5 atmospheres absolute (ATA) equivalent HBO2 group (mean change 7.4 ±15.8) and improved in the sham (-8.0 ±7.7) and 2.0 atmospheres absolute equivalent HBO2 groups (-3.3 ±7.4). Individual changes varied widely, range -23 to +28 points. In participants from the HOPPS study, total PCS scores worsened in all groups: local care (10.5 ±8.7), sham (7.9 ±11.9) and 1.5 ATA HBO2 (1.0 ±19.4). In this limited, cross-sectional sample, PCS and PTSD symptoms did not appear to improve over time by descriptive analyses. Low participation rates and potential response bias limit our ability to perform statistical hypothesis testing and to draw conclusions from these data. Future studies should prospectively plan longitudinal follow-up and regular engagement with participants to minimize attrition.

Relationship of combat experiences and alcohol misuse among U.S. Special Operations Soldiers.

This study examined the association between specific combat experiences and postdeployment hazardous drinking patterns on selected military populations that are considered high risk, such as personnel belonging to U.S. Army Special Operations Forces. Data collection were conducted in a 5-year span in which 1,323 Special Operations Forces Soldiers were surveyed anonymously from 3 to 6 months after returning from deployment to Iraq/Afghanistan regarding their combat experiences and mental health. Combat items were independently analyzed and placed into the following categories: (1) Fighting, (2) Killing, (3) Threat to oneself, (4) Death/Injury of others, and (5) Atrocities. Alcohol misuse was measured using the Alcohol Use Disorders Identification Test-Consumption. Of the Soldiers sampled, 15% (N = 201) screened positive for alcohol misuse 3 to 6 months postdeployment. Combat experiences relating to fighting, threat to oneself, and atrocities were significantly related to alcohol misuse when analyzed individually. However, when factors were analyzed simultaneously, combat experiences in the fighting category were significantly associated with a positive screen for alcohol misuse. In conclusion, Soldiers belonging to certain elite combat units are significantly more likely to screen positive for alcohol misuse if they are exposed to specific types of fighting combat experiences versus any other type of combat exposure.