Predictors for Prehospital Delay in Stroke Treatment

Stroke awareness and help-seeking behaviour: predictors for prehospital delay in stroke treatment

Ane Bull Iversen, MD Section for General Medical Practice Department of Public Health and Department of Neurology Department of Clinical Medicine Aarhus University

Supervisors:

Professor Bo Christensen, PhD, MD Section for General Medical Practice Department of Public Health Aarhus University

Professor Grethe Andersen, PhD, MD Department of Neurology Department of Clinical Medicine Aarhus University

Senior researcher Morten Bondo Christensen, PhD, MD Research Unit for General Practice Department of Public Health Aarhus University

Professor Søren Paaske Johnsen, PhD, MD Center for Clinical Health Services Research Department of Clinical Medicine Aalborg University and Aalborg University Hospital

Background Stroke is the second-leading cause of death worldwide and a leading cause of long-term disability. Each year 12,000 people in Denmark are hit by a stroke. In addition to substantial individual suffering, stroke is also associated with considerable costs to society.

The World Health Organization (WHO) has estimated a marked increase in the stroke prevalence in 2025 as a result of ageing populations. This development will increase the need to identify areas with potential for improvement in the treatment of stroke. Acute reperfusion therapies started within 4.5 to 6 hours (in some up to 24 hours) from symptom onset for AIS have revolutionized the acute stroke treatment and considerably improved the overall prognosis and mortality. However, only 15-25% of Danish patients are eligible to acute treatment. This is primarily due to presentation outside the time window for intravenous thrombolysis and endo¬vascular treatment at the stroke centre. Time is also of utmost importance in patients receiving reperfusions therapies, as the chance of functional independence decreases rapidly during the first few hours after stroke onset.

Numerous attempts have been made to reduce both prehospital and in-hospital delay in stroke by educating hospital personal, physicians, emergency medical services (EMS) and the public, and by reorganizing stroke centres and EMS systems. Nevertheless, much time is still lost before the patient arrives at the hospital. There are many causes for prehospital delay, but most are related to patient-dependent factors and not system delay. Many stroke patients do not recognize their own symptoms as signs of a stroke, do not understand the severity of these symptoms and the importance of contacting EMS immediately. Besides, acute cognitive impairment, aphasia and/or hemiplegia makes it difficult to call for medical assistance without help from a bystander. Increased prehospital delay can also be caused by inappropriate help-seeking behaviour, such as using a private vehicle, visiting a general practitioner (GP) or having a wait-and-see attitude.

Half of the patients and bystanders choose not to contact the EMS, but call their GP or the out-of-hours GP instead. Therefore, it is of great importance that persons working with telephone triage in these health services (e.g. GPs) recognize stroke symptoms and immediately refer the patient to a stroke centre. In a recent German study, GPs generally perceived stroke and transient ischemic attack (TIA) as medical emergencies. However, when using stroke case scenarios, only two thirds of the patients with clear stroke symptoms were referred as a medical emergency.

Several studies have evaluated the effect of educational campaigns on stroke knowledge and help-seeking behaviour. Many of the campaigns have successfully increased the awareness of stroke symptoms in the public, but they have had little effect in improving the behavioural response; this implies that the higher level of knowledge does not necessary result in appropriate actions in the emergency situation. On the other hand, two recent studies found an association between number of stroke symptoms correctly reported and the intention to call an ambulance. Another study found that the ability to recall two core stroke symptoms (facial weakness, limb weakness, or speech problems) was associated with seeking immediate ambulance assistance. The few studies that have examined the effect of stroke educational campaigns on revascularization therapies and reduced symptom to admission times have had inconsistent findings. If future stroke campaigns are to have an impact on the number of patients presenting within the reperfusion time window, it is of great importance to have a detailed knowledge of the reasons for prehospital delay.

To our experience, no former studies have systematically collected detailed information about stroke knowledge in patients and bystanders and combined these data with a complete time-and-event mapping of the prehospital phase for all patients.

Hypotheses

1. Prehospital delay in stroke treatment is mainly caused by:

1. Patient delay: patients and/or bystanders who do not recognize stroke symptoms as signs of severe illness that require immediate contact to the emergency medical services (EMS).

2. System delay: low accuracy in telephone triage and the diagnostic process.

2. National multimedia stroke campaigns can improve the general knowledge of stroke, ensure expedient help-seeking behaviour and increase the number of patients calling EMS directly.

Research plan

Study 1: Characterization of stroke symptom knowledge, help-seeking behaviour and prehospital delay in a cohort of consecutive stroke patients and their bystanders (cross sectional descriptive study).

Aims:

1. To explore the knowledge of stroke in stroke patients and their bystanders.

2. To explore the process from onset of symptoms until admission to hospital (including contact to EMS and/or GP/out-of-hours GP) and the reasons for prehospital delay.

3. To explore the association between stroke knowledge, help-seeking behaviour and receiving revascularization therapy.

Primary objectives:

To determine:

- The proportion of stroke patients/bystanders knowing at least two core symptoms of stroke (defined as facial palsy, palsy of extremities and aphasia/dysarthria).

- The proportion of stroke patients/bystanders making a direct EMS call.

Secondary objectives:

To determine:

- The proportion of stroke patients/bystanders contacting their GP or out-of-hours GP in first line.

- The proportion of patients contacting a family member or friend in first line.

- The average number of stroke symptoms each patient/bystander can identify.

- The proportion of patients arriving at hospital within 3 hours of symptom onset overall and stratified by whether the patients made a direct EMS call or had knowledge of at least to core stroke symptoms.

- The proportion of patients receiving revascularization therapy overall and stratified by whether the patients made a direct EMS call or had knowledge of at least to core stroke symptoms.

- Whether stroke characteristics (stroke severity, type of stroke, stroke lateralization), medical history with earlier stroke and/or socioeconomic status are associated with prehospital delay.

Method:

Based on detailed pilot interviews with 30 consecutive stroke patients from The Department of Neurology at Aarhus University Hospital, the investigators developed a structured interview assessing the knowledge in both the patient and the bystander of stroke risk factors, symptoms of stroke and their help-seeking behaviour.

The interview will be combined with background demographic characteristics and clinical information. The investigators will use the patient's medical record (EPJ) and the Danish Stroke Register (DSR) to complete this form. Registration of the patient's route from onset of symptoms to admission to stroke centre will provide us with a complete overview of the timeline.

For patients arriving by ambulance, the investigators will use the prehospital patient journal (PPJ) to document the different phases of prehospital delay. For patients who have been in contact with their GP, the GP will receive an electronic questionnaire to explore the time- and event pathway from first contact until admitting the patient to hospital, alternatively encouraging the patient/ bystander to contact EMS. The GPs will be remunerated for returning a completed questionnaire, and the investigators expect a response rate of 80%. For patients who have been in contact with the out of-hours GP, the investigators will use the out of-hours medical record. Number of contacts to GP, out-of-hours GP or EMS will be registered.

Selection of patients and bystanders:

All consecutive patients (and bystanders) with AIS, transient ischemic attack (TIA) and intracerebral haemorrhage (ICH) admitted to the Department of Neurology and the vascular out-patient clinic at Aarhus University Hospital and Regional Hospital West Jutland (Holstebro) in the period 28 January 2018 - 10 May 2018 will be interviewed.

The investigators expect a total of 500 eligible patients and 300 bystanders included during the 3-month period. Patients will be interviewed during the acute in-hospital stroke phase.

The bystander is defined as the person who was with the patient, or was called for by the patient, when the patient got ill. This is usually a close relative, but can also be a friend, college or a nurse in home-nursing. Every effort will be made to interview the bystander, either in person or by telephone.

Inclusion /exclusion criteria: see other section

Interview:

The structured interviews will be performed by trained research nurses or a research physician from the Department of Neurology, Aarhus University Hospital (AUH), or Regional Hospital West Jutland (Holstebro).

Study 2: Stroke awareness and help-seeking behaviour before and 6 months after initiation of a national stroke awareness campaign.

Aim: To evaluate the immediate effect of the national campaign six months after initiation.

Primary objectives:

To determine

- Whether a stroke campaign has increased the proportion of stroke-patients and bystanders making a primary EMS call.

- Whether a stroke campaign has increased the proportion of stroke patients, bystanders and patients with risk factors of stroke, knowing at least two core symptoms of stroke.

Secondary objectives:

Objectives from study 1

Method:

The national stroke awareness campaign is planned to run in 2019 and 2020 and is organized through the network of Danish Council for Resuscitation in collaboration with TrygFonden. The TrygFonden supports projects that contribute to better health and safety in the Danish population; from first aid courses to research projects. Coinciding this campaign Danish Regions have taken initiative to a nationwide networking between the pre-hospital organization and acute stroke hospitals in order to increase stroke identification by EMS and paramedics and reduce prehospital time-delays.

This initiative has started in 2017 and will run through 2018 and several years. The stroke awareness campaign will therefore run in an optimal situation of collaboration between stroke health care professionals and public service.

The investigators will evaluate the effect of the campaign and optimization of the prehospital service by comparing the results from study 1 described above and will conduct a similar study in 2020 when the campaign has been running for six months.

Methodological considerations

Sample size calculation:

Study 1 (and 2):

The sample size calculation is based on data from the pilot study examining stroke knowledge and help seeking behavior in patients with acute stroke. The proportion of stroke patients (bystanders) who made a direct call to EMS was 40%. To detect a 15 % absolute increase in in patients/bystanders making a direct EMS call after a national stroke campaign, at a power of 80% and a significance level of 5%, a sample size of at least 346 will be required. To account for patients with pre-stroke modified Rankin Scale (mRS) ≥ 3, patients who cannot be reached and patients/bystanders not willing to participate the investigators therefore plan to include 500 patients and 300 bystanders.

Planned statistical analyses:

Cohort characteristics are summarized using percentages or medians and interquartile range (Q1-Q3) as appropriate. Data with non-normal distributions and/or with unequal variance are compared using the Mann-Whitney U-test. In addition, comparisons will be made using multivariable linear and binary regression with adjustment for potential confounding factors.

Data handling and records:

All study data will be recorded in an electronic Case Report Form (REDCap) with identification via a study identification number. The study will be governed by the rules and regulations laid down in the Danish Act on Processing of Personal Data. Approval is obtained from the Danish Data Protection Agency. No personal data will be shared with any foreign countries.

Patient participation will be recorded in the medical record. Data will be deleted after 15 years.

Feasibility The PhD-fellow, M.D. Ane Bull Iversen (ABI) will be part of "acute conditions" - group led by Senior researcher, GP, PhD Morten Bondo Christensen at the Research Unit for General Practice, Department of Public Health, Aarhus University, where also the main supervisor Professor, GP, PhD Bo Christensen is employed. The group and the academic environment possess the required expertise in general practice medicine, epidemiology, data management and biostatistics to fully support this project during the entire PhD programme.

ABI will be employed at the Department of Neurology, Aarhus University Hospital, where co-supervisor Grethe Andersen is professor and head of the Danish Stroke Center. Co-supervisor Søren Paaske Johnsen is professor at the Department of Clinical Medicine, Aalborg University and Aalborg University Hospital.

ABI will be responsible for the development and the execution of the structured interviews and questionnaires and cooperation with other departments. She will also be responsible for the data collection and the data analysis. In addition to writing her PhD thesis, she will also be responsible for writing the first drafts and the final versions of all papers.

ABI is a medical doctor in residency for general practice. She has obtained clinical experience with general practice through 18 months of specialty training in general medicine.

Ethics and approvals Approval is obtained from the Danish Data Protection Agency and the Multipractice Study Committee of the Danish College of General Practitioners. Approval from The Central Denmark Region Committees on Health Research Ethics is not necessary.

Economy A grant from TrygFonden will cover most of the salary for the PhD-fellow and for part-time research nurses during the three-year period. The research group has received a grant from the Committee for Quality Improvement and Continuing Medical Education in general practice in the Central Denmark Regions and the Multipractice Study Committee of the Danish College of General Practitioners. (The latest to compensate participating GPs for answering the questionnaire).

Publication policy The results of the study, both negative, inconclusive and positive, will be disseminated as widely as possible. This will take place through publication of scientific papers in international peer-reviewed journals, conference presentations and press releases (if relevant).

Perspectives This study will provide new information about stroke patients, bystanders and persons at high risk of getting a stroke, their knowledge on stroke and their help-seeking behaviour. If more knowledge about the factors that cause prehospital delay in stroke treatment are obtained, the investigators will also know which areas to focus on in the future to improve the outcome for stroke patients.

Part of this project will examine the effect of TrygFondens national stroke campaign, which is expected to have impact on general knowledge and help-seeking behaviour. If more people know about the core symptoms of stroke, more people will also know how to react to these symptoms by calling EMS which will eventually increase reperfusion therapy rates. This is expected to considerably improve stroke morbidity and mortality and to reduce both the individual suffering and the societal costs.