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Jeffrey L. Saver, MD; Eric E. Smith, MD, MPH; Gregg C. Fonarow, MD; Mathew J. Reeves, PhD; Xin Zhao, MS; DaiWai M. Ols

The Golden Hour and Acute Brain Ischemia: Presenting Features and Lytic Therapy in Over 30,000 Patients Arriving within 60 Minutes of Onset at GWTG-S Hospitals. Jeffrey L. Saver, MD; Eric E. Smith, MD, MPH; Gregg C. Fonarow, MD; Mathew J. Reeves, PhD; Xin Zhao, MS; DaiWai M. Olson, PhD, RN;

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Jeffrey L. Saver, MD; Eric E. Smith, MD, MPH; Gregg C. Fonarow, MD; Mathew J. Reeves, PhD; Xin Zhao, MS; DaiWai M. Ols

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  1. The Golden Hour and Acute Brain Ischemia: Presenting Features and Lytic Therapy in Over 30,000 Patients Arriving within 60 Minutes of Onset at GWTG-S Hospitals Jeffrey L. Saver, MD; Eric E. Smith, MD, MPH; Gregg C. Fonarow, MD; Mathew J. Reeves, PhD; Xin Zhao, MS; DaiWai M. Olson, PhD, RN; Lee H. Schwamm, MD

  2. Disclosures • The Get With The Guidelines®–Stroke (GWTG-Stroke) program is provided by the American Heart Association/American Stroke Association. The GWTG-Stroke program is currently supported in part by a charitable contribution from Bristol-Myers Squib/Sanofi Pharmaceutical Partnership and the American Heart Association Pharmaceutical Roundtable. GWTG-Stroke has been funded in the past through support from Boehringer-Ingelheim and Merck. • The individual author disclosures are listed in the manuscript

  3. Background • The benefit of intravenous thrombolytic therapy in acute brain ischemia is strongly time dependent • Therapeutic yield is maximal in the first minutes after symptom onset and declines steadily during the first 3 hours

  4. Background • The Joint Commission target for Primary Stroke Centers is to achieve a Door-to-Needle time of within 60 minutes in 80% of patients • Hospitals participating in the Get With The Guidelines®–Stroke Quality Improvement program have been shown to successfully deliver intravenous fibrinolytic therapy to patients arriving within the first 60 minutes of onset

  5. Introduction • The benefit of intravenous thrombolytic therapy in acute brain ischemia is strongly time dependent. Therapeutic yield is maximal in the first minutes after symptom onset and declines rapidly over the next 4.5 hours. • In the typical large artery ischemic stroke, in each minute in which reperfusion is delayed, 2 million nerve cells die. • Patients receiving treatment within the first 60 minutes (the “Golden Hour”) of onset of symptoms, have the greatest opportunity to benefit from recanalization therapy • Hyperacute-arriving patients and their treatment have not previously not been well characterized

  6. Objective To examine the frequency, characteristics and treatment of Ischemic Stroke patients arriving at hospitals within the “Golden Hour”

  7. MethodsData Source • Hospitals participating in GWTG-Stroke who utilize the web-based patient management tool for data collection • Outcome Sciences, Inc. served as the data collection and coordination center • The Duke Clinical Research Institute (DCRI) served as the data analysis center

  8. MethodsStudy Population • Between April 1, 2003 to December 31, 2007 • 905 GWTG-Stroke Hospitals • 431,170 Ischemic Stroke and TIA patients arriving to Hospital Emergency Departments (ED’s) within 60 minutes of “last known well time”

  9. MethodsCase Identification • Trained hospital personnel instructed to ascertain consecutive Acute Stoke Admissions • Methods included regular surveillance of Emergency Dept. records, ward census logs and/or neurological consultations • The eligibility of each acute stroke admission was confirmed at chart review prior to abstraction

  10. MethodsCharacteristics • Patient Data included: • Demographics • Medical history • Initial head computerized tomography findings • In-hospital treatment and events • Discharge treatment • Mortality • Discharge destination

  11. MethodsCharacteristics • Hospital level data included: • Bed size • Academic or non-academic status • Annual volume of stroke discharges • Geographical region

  12. MethodsData Analyzed • Contingency tables were developed to assess differences in: • Demographics (age, sex) • Stroke severity • Arrival Mode (ambulance, private vehicle) • Door-to-Needle (DTN) Time • Door-to-Imaging (DTI) Time • Outcome Destination at Discharge • Generalized estimating equations logistics regression models, accounting for in-hospital clustering, were generated to identify independent predictors of Onset-to-Door Time (OTD) and Door-to-Needle Time (DTN) < 60 minutes

  13. ResultsAnalysis Sample • During the 4.75 year time period, at 905 hospital sites, data for 431,170 Ischemic Stroke and TIA patients were entered into the GWTG-Stroke database. • Main analysis performed upon 106,924 patients in this cohort with Ischemic Stroke, a documented last known well-time and presentation directly to the Emergency Department by ambulance or private vehicle.

  14. Results - Patient Characteristics

  15. Patient and Hospital Level Characteristics Independently Associated with ED Arrival within the First 60 Minutes of Onset

  16. ResultPatient Characteristics • Patients with documented “Last Known Well Time”, saw a: • Higher arrival by EMS • Higher use of TPA • Higher Stroke Severity • Lower frequency of Blacks

  17. 106,924 ischemic stroke patients arrived directly to GWTG-S hospital EDs by ambulance or private vehicle Results Onset-to-Door Time Among < 60 mins patients, mean onset to door (OTD) time: 39.9 mins (SD 14.8)

  18. ResultsTime Of Arrival cohorts • Race/Ethnicity • Slightly more often were non-Hispanic white in both 1 hour or under and 1-3 hour arrival • Less often Black or Asian in same time frames • Stroke Severity • Greatest among Golden Hour arriving patients • Intermediate among 1-3 hour arriving patients • Least among beyond 3 hour arriving patients • Frequency of Arrival to Hospital by Ambulance • 79% in 1 hour or under patients • 72.2% in 1-3 hour patients • 55% in beyond 3 hour patients • All above groups similar in age and gender • Arrival occurred mildly more often at hospitals located in the Northeast and West

  19. ResultsSymptom Onset-to-Door Time • Patient and Hospital Factors independently associated with Symptom OTD Time less than or equal to 1 hour (Golden Hour) • Increased odds of early arrival • Severe neurologic deficit • Arrival by ambulance rather than private transport • Atrial Fibrillation • Decreased odds of early arrival • Hospital location in the South • Higher annual number of Stroke Admissions

  20. Results • IV TPA given to: • 12,545 direct ED IS patients • 159 direct ED aborted IS patients (TPA-induced TIA) • 11.8% of all direct ED, IS patients with documented OTD • 5.0% of all direct ED IS patients

  21. Mean OTD 56.3 mins, DTN 84.1mins IV TPA more frequent among golden hour patients than 1-3 hour 27.1% vs 12.9%, p < 0.0001 Results

  22. Results: IV TPA DTN Times DTN in all 12,545 IV TPA patients: 86 mins (SD 42) Longer DTN in golden hr patients: mean 90.6 v 76.7 mins, p < 0.0001 Inverse relation OTD – DTN times: r = - 0.30

  23. ResultsDTN Time among Golden Hour Patients

  24. ResultsTarget DTN Time ≤ 60 Minutes Target DTN ≤ 60 mins achieved in 18.3% of golden hour-arriving patients Modest increase in proportion of patients with target DTN times by calendar year Absolute increase 1.2% per year, p=.027

  25. ResultsTarget DTN Time ≤ 60 Minutes No substantial increase in proportion of patients with target DTN times duration of hospital participation in GWTG-S p = 0.65

  26. Limitations • Participation in GWTG is voluntary and may select for higher performing hospitals. • Hospitals participating in GWTG-Stroke are likely to have more well-organized stroke systems of care than nonparticipating hospitals, so other US hospitals are likely on average to have worse lytic treatment rates and door to needle times than observed in this cohort. • The last known well time was documented in 42% of patients. • Additional factors important in fostering rapid care were not captured in the GWTG-Stroke database and therefore not analyzed, including policies of local Emergency Medical Service (EMS) agencies, hospital provision of education programs to EMS, location of CT or MRI scanners in the ED, and policies regarding need for ancillary testing before treatment such as coagulation studies, CT angiography and CT perfusion imaging, or multimodal MRI imaging, etc.

  27. Conclusions • At GWTG-S hospital ED’s, these patients arrive within 1 hour of onset symptoms: • More than 1/4 of patients with documented Onset Time • At least 1/8 of all Ischemic Stroke patients • These Golden Hour patients: • receive thrombolytic therapy more frequently but more slowly than late arrivers. • Target Door-To-Needle Time of less than 60 minutes achieved in less than 1/5 of these patients • The findings support public health initiatives to increase early presentation and shorten Door-to-Needle times in patients arriving within the Golden Hour.

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