Golden time: Analysis of the response time of the Mobile Urgency Care Service (Samu) Golden time: análise do tempo de resposta do Serviço de Atendimento Móvel de Urgência (Samu) Tiempo de oro: análisis del tiempo de respuesta del Servicio de Emergencia Móvil (Samu)

Background and Objectives: To analyze the golden time developed by the Mobile Emergency Care Service (Samu) in Floriano, Piauí, Brazil. There are few productions that primarily emphasize the service’s response time (golden hour), crucial for students and professionals in the field, whose knowledge on the issue can lead to saving lives. Methods: This is a descriptive, documentary, and quantitative study that analyzed emergency care records for the year 2018. It is based on the survey of the variables of the golden time stages, their nature, and the duration of events, analyzed by descriptive and inferential statistics. This study met all ethical principles based on the approval opinion of the ethics committee (No. 96443518.4.0000.5660). Results: The most frequent golden time performed by Samu was 15 to 30 minutes, in 58.5% of the cases. Adult clinical urgencies and emergencies were the most common types of events (35.50%). Conclusion: The most frequent service provided by Floriano’s Samu was clinical urgencies and emergencies in adults, with a response time of 15 to 30 minutes.


INTRODUCTION
-Golden hour‖ is a theory from the late 1960s whose purpose is to offer trauma victims the best possible emergency care in the shortest time between the event and the action of the rescuers, which is a crucial period for rescue of the victim 1 . Currently, it is recommended to use the term -golden time‖ instead of -golden hour‖, as it is not possible to set an exact time for the victim care in different situations. Thus, the term "golden time" is ideal because the rescue may take more than one hour to arrive.
According to the Ministry of Health, pre-hospital care (PHC) is defined as the assistance provided in a first level of care to patients with acute conditions, whether they are of a clinical, traumatic or psychiatric nature, whose purpose is to provide early assistance to victims of health problems of different natures at the place of their occurrence 2 .
In Brazil, the PHC system is divided into mobile and fixed services, so that mobile care has the mission of providing immediate assistance to victims who are referred to the fixed PHC or to hospital care. This work can be performed by professionals whose specific training for the rescuer activity is a criterion used to enable them to work in pre-hospital services. This occurs in many countries like the United Kingdom, the USA, and France, but not in Brazil 3 .
No occurrence, scene, or patient is the same, requiring the team to have the flexibility to act according to each situation. The objective of pre-hospital emergency care is always the same: (1) reach the victim; (2) identify and treat injuries as early as possible; and (3) immobilize it and transport it to the reference institution 4 .
The PHC has predefined time intervals in order to provide greater agility in the passage between the trauma site and the hospital, including: the travel time from the base to the scene (activation of the service and arrival at the site); the on-scene interval (arrival at the site and on-site care); the travel time from the scene to the reference service (departure from the scene); and the golden time (activation of the service and arrival at the hospital).
This process provides for emergency care within realistic timescales to achieve positive results in saving lives. The concept assumes that, in the first hour of effective care, the person who suffered trauma is more likely to survive than after this period 5,6 .
Considering all the obstacles in this process, we raise the following question: is the response time of the Mobile Emergency Care Service (Samu) in the city of Floriano (Piauí, Brazil) adequate? To answer it, we analyzed the golden time of Samu in this municipality.

METHODS
This is a descriptive, documentary study with a quantitative approach carried out in the city of Floriano, in the period between February and March 2019 on the decentralized basis of Samu.
The municipality of Floriano is located in a reference point, right at the entrance to the south and southeast of Piauí. According to data from the Brazilian Institute of Geography and Statistics (IBGE), for the year 2020 it is estimated that its population is 60,025 people. It is the fifth richest city in the state, with a gross domestic product per capita of R$ 17,285.07 7 , with the service sector being the most important for the municipality's economy. During the morning, its shopping malls serves a large number of people from various cities in southern Piauí and Maranhão, causing traffic-related disorders in that location. Floriano also stands out as an educational pole, as it has a vast education network, especially at higher and technical levels. In terms of health services, the municipality offers extensive care in both the public and private sectors. It has a medium-sized regional hospital and basic health units throughout the territory, and it is a reference in neurosurgery assistance, with emergency care, outpatient emergency, and surgical procedures. The city also has a network of private clinics with a small private hospital. These services meet the demand of the macro-region in several specialties. Samu, implemented in 2006, works in support, hospital transport, clinical cases, and trauma in the region.
We used the records of emergency care carried out in 2018 by nursing students to constitute the study population. Then, we collect the variables related to the stages of the golden time, the nature of the emergency care, and the time of the event. Thus, of the 4,038 complications due to external and clinical causes, we established the weighted average of monthly occurrences (336.5) for verification.
We included services classified as cases of urgency or emergency that occurred on urban public roads in the municipality, regardless of sex and age, as well as those that required displacement from the Advanced Support Unit, Basic Support Unit or other. Calls for clinical, obstetric, traumatic. or psychiatric health care were also included. Cases of predominance in rural areas, such as snakebites, were excluded.
Data analysis was carried out using descriptive and inferential statistics, in which categorical variables are presented using distributions of absolute and relative frequencies.
For quantitative variables, measures of centrality (mean) and variability (standard deviation)

RESULTS
The average time spent by Samu in each stage was 5 to 15 minutesoccurring in 50.5% of the trips from the base to the scene, in 65% of the services on site and in 59% of the trips from the scene to the reference service -, with the exception of golden time, which ranged from 15 to 30 minutes in most cases (58.5%) ( Table 1). illness, stab wounds, thermal shock, situations in which the victim had already been removed when the service arrived at the scene, and those in which the victim died before help arrived ( Figure 1). minutes, the latter being the time that was most frequent in the emergency care (Table 2).

DISCUSSION
The transportation time to the specialized health service is an essential factor to be considered in the prognosis of the traumatized person, as it is extremely important that the PHC systems are strengthened and organized 8 .
In a highly urbanized area, where traffic conditions fluctuate constantly, transport infrastructure is a major contributor to ease of maintenance and reliable vehicle circulation.
Thus, the stage of travel time from the base of Samu to the scene of the occurrence is the most affected by interference from external actions 9 .
The average time required to provide an ideal care to the victim is around 30 and 40 minutes. Thus, it can be said that the time used by Floriano's service fits the recommendations, since about 80% of the emergency cares were performed within 30 minutes, making patients more likely to have a positive prognosis 1 .
One of the premises of the PHC is to arrive at the scene of the injury early, to intervene in the shortest possible time, reducing sequelae or deaths, and to improve the survival conditions of the victims, ensuring proper care and transportation. These premises have a strong impact on health problems in which time is a determining factor for the outcome of care 10. These scenarios, in turn, lead to an important issue in this analysis: the concept of potentially preventable death, that is, one that could be prevented if the right treatment was administered, at the ideal time 11 .
In this sense, the present study shows a transition from the most frequent cases answered by Samu, since clinical care for adults is the most requested service, countering the idea that traffic accidents are the major cause of traumatic conditions, as found for the country and states 12 .
Traffic accidents are among the main causes of mortality worldwide, especially in developing countries, such as Brazil. In addition, they are responsible for the main cause of disease burden in developed countries, in which an individual dies in traffic accidents every 20 minutes. This occurs due to the carelessness of citizens, who abuse speed limits, neglect safety measures, and constantly abuse alcohol intake 13 . The United Nations has recognized urban traffic accidents for several years as a serious public health problem worldwide, as they are accompanied by a high rate of morbidity and mortality 14 .
The cases of sudden illness appear as one of the less frequent. Its cause may be linked not only to loss of consciousness, but also to a range of situations and problems, such as heart attack, stroke, among others, as indicated by the current guidelines of the American Heart Association, focused mainly on the prevention of sudden illness 15 . It is also worth mentioning the -XABCDE‖ approaches to assisting multiple trauma patients, which allow a preliminary assessment in order to avoid aggravating the victim's condition or even a sudden illness 15. In turn, trauma has occupied a prominent place in the statistics of diagnoses and hospital admissions. Therefore, it is characterized as a pandemic of modern life and a serious public health problem, since it reached the first place as the etiology of morbidity and mortality of the general population 11 .
The less frequent cases in the group of trauma-orthopedic events are falls, with an average time of 22 minutes, in accordance with the predicted. Thus, all times observed in this group are within the parameters recommended by the golden time metric.
Among clinical events, cases of emergency medical care in adults predominated. In these events, especially those that require specialized referral services or even vacancies in the intensive care unit, there is a tendency to occur a significant increase in the time spent by Samu in the rescue, which can be explained by common situations in Brazilian health services, such as overcrowding, excess demands and lack of a specific unit to receive the case.
We note that cases of snakebites did not count in the occurrence count. This can be justified by the fact that the sample is exclusively urban and by the sample fluctuations, although Samu serves the urban and rural areas.
The maximum time observed was different from what is expected, being inconsistent with reality. This can be attributed to transfers made to other hospitalsin this case, to the capital Teresina -, or even to a mistake in the annotation. This may imply a misinterpretation of the data, leading the reader to imagine that the service needs a much longer time than recommended for its performance, when, in fact, what happened was an incorrect record.
At this point, users affected by clinical conditions in situations that destabilize their vital condition require early and qualified intervention. These are one of the reasons for seeking health services, which include mobile care 16 .
Still in the category of clinical cases, those of drowning are noteworthy, and it can be inferred that they have demanded greater dedication from rescuers because they are slightly more complex events. Burns, on the other hand, differ from what is expected in their maximum emergency care time, despite their minimum time following the parameters recommended by the golden timewhich is necessary, since it is a traumatic event.
As for events of a surgical nature, aggressions also reach a high average time, although the minimum is within the recommended time. In these situations, the provision of assistance presents complicating factors, such as popular crowding, making it difficult for professionals to withdraw the victim.

CONCLUSION
In this study of the PHCs of Samu de Floriano (Piauí, Brazil), we found that the most frequent cases were adult clinical urgencies or emergencies, usually taking 15 to 30 minutes to provide assistance. It is worth mentioning some limitations of the study, such as the lack of a reference that explains the topic addressed, in addition to the specific difficulties that may occur in the service. Therefore, this study should not be exhausted by the results presented, but new perspectives must be stimulated and implemented with the aim of improving the PHC service.