Prehospital physicians balance the need to stabilize patients prior to transport, minimizing the delay to transport patients to the appropriate level of care. Literature has focused on which interventions should be performed in the prehospital environment, with airway management, specifically prehospital intubation (PHI), being a commonly discussed topic. However, few studies have sought additional factors which influence scene time or quantify the impact of mission characteristics or therapeutic interventions on scene time.

The goal of this study was to identify specific interventions, patient demographics, or mission characteristics that increase scene time and quantify their impact on scene time.

A retrospective, database model-building study was performed using the prehospital mission database of South Australian Ambulance Service (SAAS; Adelaide, South Australia) MedSTAR retrieval service from January 1, 2015 through August 31, 2016. Mission variables, including patient age, weight, gender, retrieval platform, physician type, PHI, arterial line placement, central line placement, and finger thoracostomy, were assessed for predictors of scene time.

A total of 506 missions were included in this study. Average prehospital scene time was 34 (SD = 21) minutes. Four mission variables significantly increased scene time: patient age, rotary wing transport, PHI, and arterial line placement increased scene time by 0.09 (SD = 0.08) minutes, 13.6 (SD = 3.2) minutes, 11.6 (SD = 3.8) minutes, and 34.4 (SD = 8.4) minutes, respectively.

This study identifies two mission characteristics, patient age and rotary wing transport, and two interventions, PHI and arterial line placement, which significantly increase scene time. Elderly patients are medically complex and more severely injured than younger patients, thus, may require more time to stabilize on-scene. Inherent in rotary wing operations is the time to prepare for the flight, which is shorter during ground transport. The time required to safely execute a PHI is similar to that in the literature and has remained constant over the past two years; arterial line placement took longer than envisioned. The SAAS MedSTAR has changed its clinical practice guidelines for prehospital interventions based on this study’s results. Retrieval services should similarly assess the necessity and efficiency of interventions to optimize scene time, knowing that the time required to safely execute an intervention may reach a minimum duration. Defining the scene time enables mission planning, team training, and audit review with the aim of improved patient care.

Inter-facility transport of critically ill patients is associated with a high risk of adverse events, and critical care transport (CCT) teams may spend considerable time at sending institutions preparing patients for transport. The effect of mode of transport and distance to be traveled on on-scene times (OSTs) has not been well-described.

Quantification of the time required to package patients and complete CCTs based on mode of transport and distance between facilities is important for hospitals and CCT teams to allocate resources effectively.

This is a retrospective review of OSTs and transport times for patients with hypoxemic respiratory failure transported from October 2009 through December 2012 from sending hospitals to three tertiary care hospitals. Differences among the OSTs and transport times based on the mode of transport (ground, rotor wing, or fixed wing), distance traveled, and intra-hospital pick-up location (emergency department [ED] vs intensive care unit [ICU]) were assessed. Correlations between OSTs and transport times were performed based on mode of transport and distance traveled.

Two hundred thirty-nine charts were identified for review. Mean OST was 42.2 (SD=18.8) minutes, and mean transport time was 35.7 (SD=19.5) minutes. On-scene time was greater than en route time for 147 patients and greater than total trip time for 91. Mean transport distance was 42.2 (SD=35.1) miles. There were no differences in the OST based on mode of transport; however, total transport time was significantly shorter for rotor versus ground, (39.9 [SD=19.9] minutes vs 54.2 [SD=24.7] minutes; P <.001) and for rotor versus fixed wing (84.3 [SD=34.2] minutes; P=0.02). On-scene time in the ED was significantly shorter than the ICU (33.5 [SD=15.7] minutes vs 45.2 [SD=18.8] minutes; P <.001). For all patients, regardless of mode of transportation, there was no correlation between OST and total miles travelled; although, there was a significant correlation between the time en route and distance, as well as total trip time and distance.

In this cohort of critically ill patients with hypoxemic respiratory failure, OST was over 40 minutes and was often longer than the total trip time. On-scene time did not correlate with mode of transport or distance traveled. These data can assist in planning inter-facility transports for both the sending and receiving hospitals, as well as CCT services.

WilcoxSR , SaiaMS , WadenH , McGahnSJ , FrakesM , WedelSK , RichardsJB . On-scene Times for Inter-facility Transport of Patients with Hypoxemic Respiratory Failure. Prehosp Disaster Med. 2016;31(3):267–271.

To document the existence and nature of variation in times to trauma care between urban and rural locations; to assess the impact of identified variations on outcome.

Retrospective case review

Washington state, 1986

Motor-vehicle-collision fatalities

Previously unreported definitions of urban and rural location and possibly preventable death were used to conduct a comparative analysis of urban and rural fatalities. Trauma care times in the prehospital and the emergency department (ED) phases of care were abstracted. Their relationships to corresponding crude death rates and possibly preventable death rates also were examined.

Prehospital times averaged two times longer in rural locations than in urban areas. First-physician contact in the ED averaged six times longer in rural locations than in urban settings. Concomitantly, the crude death rate in rural settings was three times that of the urban areas. The overall possibly preventable death rate was double the urban rates in rural incidents. When stratified by phase of care, rate of possibly preventable death showed no urban/rural variation for the prehospital phase, but was three times greater for the ED phase in rural areas than in urban ones.

Trauma care times and adverse outcome appear to be associated. Allocation of resources to decrease length of and geographic variation in time to definitive care, particularly in the ED phase, seems appropriate.

To test the hypothesis that a prehospital time threshold (PhTT) exists that when exceeded, significantly increases the mortality of trauma patients transported directly from the scene of injury to a trauma center rather than to the closest hospital.

Review of data contained within the Illinois Trauma Registry encompassing the period from fall 1989 through spring 1991.

A total of 5,215 injured persons with an Injury Severity Score (ISS) >10, cared for in an Illinois level-I or -II trauma center outside of the city of Chicago.

Injury severity expressed as ISS, scene time (ST), transport time (TrT), total emergency medical services time (TEMST), and outcome were determined for each patient. Patients were stratified into groups on the basis of ISS.

Patient outcomes were significantly different statistically between ISS groups (p <0.001, X2). Mean ST and TEMST, but not TrT, were significantly different statistically between ISS groups (p <0.001, analysis of variance). Lower ISS was associated with longer times. Mean ST, TrT, and TEMST were significantly different statistically between survivors and nonsurvivors (p <0.001, two-sample t-tests). Survival was associated with longer times. Each of the mean times remained significantly different between survivors and nonsurvivors after controlling for severity of injury (p <0.001, two-way analysis of variance).

No PhTT beyond which time patient transport to the closest hospital would have decreased mortality was identifiable, because no prehospital time <90 minutes exerted a significant adverse effect upon survival.