Impact of time and distance on outcomes following tourniquet use in civilian and military settings: A scoping review

BACKGROUND

The last two decades have seen the reintroduction of tourniquets into guidelines for the management of acute limb trauma requiring hemorrhage control. Evidence supporting tourniquet application has demonstrated low complication rates in modern military settings involving rapid evacuation timeframes. It is unclear how these findings translate to patients who have prolonged transport times from injury in rural settings. This scoping review investigates the relationship between time and distance on metabolic complications, limb salvage and mortality following tourniquet use in civilian and military settings.

METHODS

A systematic search strategy was conducted using PubMed, Embase, and SafetyLit databases. Study characteristics, setting, mechanism of injury, prehospital time, tourniquet time, distance, limb salvage, metabolic response, mortality, and tourniquet removal details were extracted from eligible studies. Descriptive statistics were recorded, and studies were grouped by ischemia time (< 2 h, 2-4 h, or > 4 h).

RESULTS

The search identified 3103 studies, from which 86 studies were included in this scoping review. Of the 86 studies, 55 studies were primarily in civilian environments and 32 were based in military settings. One study included both settings. Blast injury was the most common mechanism of injury sustained by patients in military settings (72.8% [5968/8200]) followed by penetrating injury (23.5% [1926/8200]). In contrast, in civilian settings penetrating injury was the most common mechanism (47.7% [1633/3426]) followed by blunt injury (36.4% [1246/3426]). Tourniquet time was reported in 66/86 studies. Tourniquet time over four hours was associated with reduced limb salvage rates (57.1%) and higher mortality rates (7.1%) compared with a tourniquet time of less than two hours. The overall limb salvage and mortality rates were 69.6% and 6.7% respectively. Metabolic outcomes were reported in 28/86 studies with smaller sample sizes and inconsistencies in which parameters were reported.

CONCLUSION

This scoping review presents literature describing comparatively safe tourniquet application when used for less than two hours duration. However, there is limited research describing prolonged tourniquet application or when used for protracted distances, such that the impact of tourniquet release time on metabolic outcomes and complications remains unclear. Prospective studies utilizing the development of an international database to provide this dataset is required.

Maintaining Surgical Readiness While Deployed to Low-Volume Military Treatment Facilities: A Pilot Program for Clinical and Operational Sustainment Training in the Deployed Environment

INTRODUCTION

Maintaining readiness among Army surgeons is increasingly challenging because of declining operative experience during certain deployments. Novel solutions should be considered.

MATERIALS AND METHODS

A pilot program was conducted to rotate surgical teams from a military treatment facility with a low volume of combat casualty care to one with a higher volume. Pre- and postrotation surveys were conducted to measure relative operative experience, trauma experience, and perceived readiness among rotators.

RESULTS

Operative volumes and trauma volumes were increased and that perceived readiness among rotators, especially those with the fewest previous deployments, was improved.

CONCLUSIONS

Maintaining readiness among Army surgeons is a difficult task, but a combination of increased trauma care while in garrison, as well as increased humanitarian care during deployments, may be helpful. Additionally, rotating providers from facilities caring for few combat casualties to facilities caring for more combat casualties may also be feasible, safe, and helpful.

Surgery at Sea: Exploring the Training Gap for Isolated Military Surgeons

OBJECTIVE

Newly-graduated military general surgeons often find themselves isolated at sea, solely responsible for all surgical care of several thousand sailors, regardless of the surgical specialty training required for any individual procedure. This educational need assessment explored trends in afloat surgical care over the last 25 years, and assessed trainees' preparedness for their expected role as an isolated surgeon.

DESIGN

A sample of deidentified US Navy Ship's Surgeon case logs were reviewed to determine afloat case load trends in 5 common afloat case categories (urologic/gynecologic, anorectal, hernia, appendectomy, and hand/orthopedic/trauma) from 1990s to 2017. Individual procedures were mapped to American College of Surgeons/Military Health System Knowledge, Skills, and Attitudes line items to ensure afloat-relevant skills were identified. Recent military resident case logs were then compared with afloat cases to evaluate relevant trainee experience.

SETTING

US Navy ships at sea from 1995 to 2017.

PARTICIPANTS

US Navy afloat-deployed surgeons, totaling 1340 cases within the study period.

RESULTS

Case log analysis of 1340 surgeries, comprising >200 months at sea, reflected 46 named procedures; 34 of 46 (74%) correlated to an intraoperative knowledge, skills, and attitudes item. The most common surgeries were vasectomy, (304 of 1340, 23%). No difference in case mix was apparent comparing pre- and post-2000 deployments (representing afloat laparoscopic integration) in 4 of 5 categories, while hernias proportionally declined. Case volume per deployment markedly declined overall (p < 0.001) and in each category. Resident case log analysis from 2012 to 2016 showed experience was limited in urologic/gynecologic, orthopedic, and open appendectomy categories.

CONCLUSIONS

No formal case repository exists for afloat surgery, making detailed analysis problematic. Current training provides excellent surgical education but minimal exposure to rare-but-real cases expected on deployments, which may not translate to competency for the isolated, afloat surgeon. Military surgical leadership should embrace training for these cases and assertively invest in the development of the military's newest surgeons.

Cardiac massage for trauma patients in the battlefield: An assessment for survivors

INTRODUCTION

Survival from traumatic cardiopulmonary arrest (TCA) has been reported at a rate as low as 0-2.6% in the civilian pre-hospital setting, and many consider resuscitation of this group to be futile. The aim of this investigation was to describe patients who received cardiac massage during TCA in a battlefield setting; we also aimed to identify predictors of survival.

METHODS

We conducted a review of the Department of Defense Trauma Registry to identify patients who received cardiac massage in the battlefield between 2007 and 2014. Patients were also grouped according to location of cardiac arrest: pre-hospital (PH) and in-hospital (IH). The groups were compared and evaluated by injury, transport time, type of resuscitation, and pre-hospital procedures. Outcome variables included survival to discharge and 30-day survival. Categorical variables were analysed using chi-square or Fisher's exact tests. Wilcoxon tests were performed for continuous variables. Regression modelling was used to assess for predictors of survival.

RESULTS

75 of all 582 patients (13%, 95% CI 10-16) survived to 30 days, and all survivors were transported out of the battlefield; 23 PH (7.8%, 95% CI 5.2-12) and 52 IH (17%, 95% CI 13-22) patients survived to 30 days (p < 0.001). Closed-chest cardiac massage with the administration of intravenous medications was associated with 30-day survival among IH patients.

CONCLUSIONS

We report a 13% survival to 30 days among all patients receiving cardiac massage in a battlefield setting. Closed-chest cardiac massage predicted survival among IH TCA victims who also received intravenous medications in this review of combat-related TCA.

Military Weapon Injury Among Illegal Immigrants at the Southern Border of Israel: A Single Level I Trauma Center Series

This article describes the characteristics of injuries of illegal immigrants admitted to a Level I trauma center after being shot at the southern border of Israel. This is a retrospective descriptive study. Some of the variables were compared to a group of soldiers who sustained penetrating injury at the same region where the illegal migrant were injured. The study includes 162 patients. The lower body absorbed a higher percentage of the injuries (61 %). The hospitalization time is longer for the migrant patients compared to the soldiers (13 ± 2 vs. 3 ± 0.3 days p = 0.0001). This study on wounded immigrants shows that a conjoint military and civilian system can result in favourable outcomes. The manuscript is an attempt to bring this unique situation, its type of injuries, and the difficulties of the health system in coping with it, to the notice of all authorities that may address a similar challenge.