Peter T. Pons

Epidemiology of trauma deaths : a reassessment

OBJECTIVE Recognizing the impact of the 1977 San Francisco study of trauma deaths in trauma care, our purpose was to reassess those findings in a contemporary trauma system. DESIGN Cross-sectional. MATERIAL AND METHODS All trauma deaths occurring in Denver City and County during 1992 were reviewed; data were obtained by cross-referencing four databases: paramedic trip reports, trauma registries, coroner autopsy reports and police reports. MEASUREMENTS AND MAIN RESULTS There were 289 postinjury fatalities; mean age was 36.8 +/- 1.2 years and mean Injury Severity Score (ISS) was 35.7 +/- 1.2. Predominant injury mechanisms were gunshot wounds in 121 (42%), motorvehicle accidents in 75 (38%) and falls in 23 (8%) cases. Seven (2%) individuals sustained lethal burns. Ninety eight (34%) deaths occurred in the pre-hospital setting. The remaining 191 (66%) patients were transported to the hospital. Of these, 154 (81%) died in the first 48 hours (acute), 11 (6%) within three to seven days (early) and 26 (14%) after seven days (late). Central nervous system injuries were the most frequent cause of death (42%), followed by exsanguination (39%) and organ failure (7%). While acute and early deaths were mostly due to the first two causes, organ failure was the most common cause of late death (61%). CONCLUSIONS In comparison with the previous report, we observed similar injury mechanisms, demographics and causes of death. However, in our experience, there was an improved access to the medical system, greater proportion of late deaths due to brain injury and lack of the classic trimodal distribution.

EIGHT MINUTES OR LESS: DOES THE AMBULANCE RESPONSE TIME GUIDELINE IMPACT TRAUMA PATIENT OUTCOME?

Emergency Medical Services (EMS) agencies are increasingly being held to an ambulance response time (RT) criterion of responding to a medical emergency within 8 min for at least 90% of calls. This recommendation resulted from one study of outcome after nontraumatic cardiac arrest and has never been studied for any other emergency. This retrospective study evaluates the effect of exceeding the 8 min RT guideline on patient survival for victims of traumatic injury treated by an urban paramedic ambulance EMS system and transported to a single Level I trauma center. Of 3576 patients identified by the hospital trauma registry, 3490 (97.6%) had complete records available. Patients were grouped according to ambulance RT: < or = 8 min (n = 2450) or > 8 min (n = 1040). After controlling for other significant predictors, there was no difference in survival after traumatic injury when the 8 min ambulance RT criteria was exceeded (mortality odds ratio 0.81, 95% CI 0.43-1.52). There was also no significant difference in survival when patients were stratified by injury severity score group. Exceeding the ambulance industry response time criterion of 8 min does not affect patient survival after traumatic injury.

Prehospital advanced trauma life support for critical blunt trauma victims

The ability of paramedics to deliver advanced trauma life support (ATLS) in an expedient fashion for victims of trauma has been strongly challenged. In this study, the records of 114 consecutive victims of blunt trauma who underwent laparotomy or thoracotomy were reviewed. Prehospital care was rendered by paramedics operating under strict protocols. The mean response time (minutes +/- SEM) to the scene was 5.6 +/- 0.27. On-scene time was 13.9 +/- 0.62. The time to return to the hospital was 8.0 +/- 0.4. On-scene time included assessing hazards at the scene, patient extrication, spine immobilization (n = 98), application of oxygen (n = 94), measurement of vital signs (n = 114), splinting of 59 limbs, and the following ATLS procedures: endotracheal intubation (n = 31), IV access (n = 106), ECG monitoring (n = 69), procurement of blood for tests including type and cross (n = 58), and application of a pneumatic antishock garment (PASG) (n = 31). On-scene times were analyzed according to the number of ATLS procedures performed: insertion of one IV line (n = 46), 14.8 +/- 1.03 minutes; two IV lines (n = 28), 13.4 +/- 0.92; one IV line plus intubation (n = 7), 14.0 +/- 2.94; two IV lines plus intubation (n = 9), 17.0 +/- 2.38; and two IV lines plus intubation plus PASG (n = 13), 12.4 +/- 1.36. Of the 161 IV attempts, 94% were completed successfully. Of 36 attempts at endotracheal intubation, 89% were successful.(ABSTRACT TRUNCATED AT 250 WORDS)

Prehospital advanced trauma life support for critical penetrating wounds to the thorax and abdomen.

The role of advanced trauma life support (ATLS) in the prehospital care of the critically injured is highly controversial. This study analyzes the efficacy of ATLS in the management of critical penetrating wounds of the thorax and abdomen. In the 2 1/2-year period ending July 1984, 203 consecutive patients underwent emergency laparotomy or thoracotomy for gunshot and stab wounds. All patients were treated in the field by advanced paramedics (EMT-P). For gunshot wounds the mean time (+/- S.E.M.) responding to the scene was 4.5 (+/- 0.29) minutes, on the scene 10.1 (+/- 0.41) minutes, and returning to the hospital 6.4 (+/- 0.32) minutes. For stab wounds the mean time responding to the scene was 4.8 (+/- 0.21) minutes, on the scene 9.5 (+/- 0.37) minutes, and returning to the hospital 5.7 (+ 0.30) minutes. The number of intravenous lines started averaged 1.8 per patient. Eighty-one patients had PASG applied and 28 patients underwent endotracheal intubation (21 orally, seven nasally). Thirty-three patients had no obtainable blood pressure, of whom six survived (18%). One hundred sixty (94%) of the remaining 170 patients who had any initial blood pressure survived. One hundred nine (55%) patients had an increase in BP greater than or equal to 10 mm Hg (average, 35.6 mm Hg), 64 (32%) had no significant change, and 25 (13%) had a fall greater than or equal to 10 mm Hg (average, 24.2 mm Hg) from the field to the emergency department. Twenty (80%) of the 25 patients with a fall in blood pressure survived.(ABSTRACT TRUNCATED AT 250 WORDS)

Prehospital venous access in an urban paramedic system--a prospective on-scene analysis.

Prehospital intravenous access has been central to the debate of paramedic intervention during management of trauma in the field. Some have suggested that excessive time requirements for IV access are detrimental to patient salvage. This prospective study objectively quantified the time required to place a peripheral IV line in our urban paramedic system. A third-party observer, nonparamedic, timed the procedure on scene with a stopwatch. Total intravenous time, including obtaining a 30-cc blood sample, was defined as the period from removal of the catheter cover until the catheter was taped. The study group included 125 patients (51 trauma and 74 nontrauma). The average total time to obtain IV access and sample blood was 2.20 +/- 0.20 and 2.71 +/- 0.18 minutes in trauma and nontrauma patients, respectively. In a subset of 63 patients in whom blood sampling time was determined separately, subtracting that from total IV time provided a net of 0.58 +/- 0.09 minutes to obtain access. Fourteen patients had a second IV line started (without blood sampling), requiring 1.25 +/- 0.38 and 0.70 +/- 0.24 minutes, respectively, for trauma and nontrauma patients. Paramedics were successful on their first IV attempt in 90% of trauma and 84% of nontrauma patients; ultimate success was 100%. This on scene study documents the time required for prehospital IV access, performed by a well-trained paramedic in an E.M.S. system with strong medical control, is less than 90 seconds.

An advanced emergency medical care system at National Football League games.

An ongoing emergency medical care system involving paramedics and physicians at National Football League games is described. Medical converage was provided from three manned first aid stations in the stadium. During the 1978 football season 298 patients were seen by the medical team. Of those, 35 (11.75%) were sent to area hospitals. Two patients who sustained cardiac arrest were successfully resuscitated and eventually discharged home. There appeared to be a direct relationship between the recorded temperature during the game and the number of patients evaluated.

The efficacy of intravenous droperidol in the prehospital setting.

Droperidol is used for sedating combative patients in the emergency department (ED). We performed a randomized, prospective, double-blind study to evaluate the efficacy of droperidol in the management of combative patients in the prehospital setting. Forty-six patients intravenously received the contents of 2-cc vials of saline or droperidol (5 mg). Paramedics used a 5-point scale to quantify agitation levels prior to and 5 and 10 min after administration of the vials. Twenty-three patients received droperidol and 23 received saline. At 5 min, patients in the droperidol group were significantly less agitated than were patients in the saline group. At 10 min, this difference was highly significant. Eleven patients in the saline group (48%) required more sedation after arrival in the ED versus 3 patients (13%) in the droperidol group. We conclude that droperidol is effective in sedating combative patients in the prehospital setting.

Prehospital spine immobilization for penetrating trauma--review and recommendations from the Prehospital Trauma Life Support Executive Committee.

Spine immobilization in trauma patients suspected of having a spinal injury has been a cornerstone of prehospital treatment for decades. Current practices are based on the belief that a patient with an injured spinal column can deteriorate neurologically without immobilization. Most treatment protocols do not differentiate between blunt and penetrating mechanisms of injury. Current Emergency Medical Service (EMS) protocols for spinal immobilization of penetrating trauma are based on historic practices rather than scientific merits. Although blunt spinal column injuries will occasionally produce unstable vertebral injuries, which may result in subsequent neurologic propagation if not managed appropriately in the field, this has not been demonstrated to be the case with penetrating trauma.1 Patients with penetrating trauma have different management priorities than those with blunt mechanisms. In patients with penetrating wounds of the head and neck, cervical collars hinder provider assessment of the neck for evolving injuries, tissue edema, subcutaneous emphysema, hematoma development or expansion, and tracheal deviation— with many of these injuries often identified only after removal of the cervical collar.2,3 Airway management is a significant issue in the penetrating trauma population who have had their cervical spine immobilized by prehospital personnel. Endotracheal intubation is more difficult in patients with cervical immobilization.4 More attempts at intubation occur in patients with cervical spine immobilization than occur without, and there is a higher incidence of esophageal intubation and tube dislodgement in this group.5 In the case of penetrating injuries, delays in transport prolong the time before patients receive the prompt surgical care needed to arrest hemorrhage. Even with experienced prehospital providers, spine immobilization is time consuming. The time required for experienced emergency medical technicians to properly immobilize a cervical spine has been reported to be 5.64 minutes ( 1.49 minutes).6 This scene delay can be catastrophic for a patient with penetrating trauma requiring urgent surgical intervention for airway compromise or hemorrhage. Studies have demonstrated that cervical collars increase intracranial pressure in patients with head injuries.7–9 The mechanism for this rise in intracranial pressure is unknown but has been postulated to be due to jugular venous compression by the cervical collar.10 Finally, no study has demonstrated that penetrating trauma can produce an unstable spine injury. Progression of spinal cord injury has not been demonstrated to occur following penetrating trauma, which has a different mechanism of injury from blunt trauma. The PreHospital Trauma Life Support (PHTLS) program is a national and international educational effort sponsored jointly by the National Association of Emergency Medical Technicians and the American College of Surgeons Committee on Trauma. The Executive Committee of PHTLS is comprised of surgeons, emergency physicians, and paramedics. The mission of PHTLS is to further the knowledge of prehospital providers of all levels in the management of victims of trauma. To that end, PHTLS publishes textbooks and offers educational courses for prehospital providers at both basic and advanced levels of training. The PHTLS program was modeled after the American College of Surgeons Committee on Trauma Advanced Trauma Life Support course for physicians.

Emergency Department Documentation in Cases of Intentional Assault

STUDY OBJECTIVE Emergency department records are an important source of injury surveillance data. However, documentation regarding intentional assault has not been studied and may be suboptimal. The purpose of this study was to analyze physician documentation of assailant, site, and object used in intentional assault. METHODS The ED log of an urban Level I trauma center was retrospectively reviewed to identify eligible patients presenting consecutively in November 1996. All acutely injured patients not involved in a motorized vehicle crash were identified. RESULTS From the ED log, 1, 483 patients were identified as possible study subjects; 1,457 (98%) charts were located and reviewed and 971 (67%) met inclusion criteria. Of these, 288 (30%) cases resulted from intentional assault. In 67% of patients, there was no documentation of the identity of the assailant. For 13% of cases, there was no documentation regarding the object or force used in the assault. In 79% of cases there was no documentation regarding the site of assault. For 24 cases (8%), the assailant was documented as an intimate partner or ex-partner. Police involvement in these cases was documented 54% of the time, despite the fact that this state mandates police reports for cases of acute partner violence. Social service involvement and shelter referrals were documented in less than one fourth of domestic violence cases. CONCLUSION Although the ED commonly treats patients who have been assaulted, basic surveillance data are often omitted from the chart. Structured charting may provide more complete data collection.

Adult versus pediatric prehospital trauma care: is there a difference?

BACKGROUND Management of the injured child in the prehospital setting continues to be debated. Issues raised in the literature include time spent on scene, skill maintenance and performance, and reported poorer outcomes compared with adults. METHODS Retrospective 2-year review of all pediatric (n = 232) and adult (n = 3,375) patients treated by a single emergency medical services agency and transported and admitted to a Level I trauma center. Patients were divided into two groups, pediatric (age 0 to 12 years) and adult (age >12 years) and further stratified into three Injury Severity Score subgroups; 1 to 15, 16 to 25, and more than 25. RESULTS There were no significant differences in scene time for any of the groups. The percentage of patients with intravenous access or endotracheal intubation in the field and the mean Injury Severity Score were not different for the moderate or severely injured groups, although in the minor trauma group fewer pediatric patients had intravenous access or intubation performed. There were no differences in outcome for any of the groups. CONCLUSION Paramedics are able to provide pediatric trauma patients a level of care comparable to that provided adult patients with similar outcome.