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Study of Survivors of Different Types of Cardiac Arrest and Their Neurological Recovery

9. ledna 2014 aktualizováno: Eyad AlThenayan, Lawson Health Research Institute

Neurological Outcomes After Cardiac Arrest in Pulseless Electrical Activity in Comparison to Asystole. Are All Non-shockable Rhythms the Same?

After successful resuscitation from certain types of cardiac arrest, total body cooling is now a well established treatment that improves the chances of the brain recovering. This however, has only been definitively proven after a certain type of cardiac arrest that is "ventricular fibrillation / ventricular tachycardia". The purpose of this study is to explore if total body cooling is beneficial for patients recovering from another type of cardiac arrest that is "pulseless electrical activity".

HYPOTHESIS:

Patients undergoing post-cardiac arrest therapeutic hypothermia have better neurological outcomes if their initial arrest rhythm is pulseless electrical activity (PEA) in comparison to asystole.

Přehled studie

Detailní popis

STUDY RATIONALE AND BACKGROUND INFORMATION:

After successful resuscitation from cardiac arrest the body experiences a period of global reperfusion. During this period, patients may show signs of myocardial stunning, lactic acidosis, neurological injury and reperfusion syndrome. This constellation of findings constitutes what is known as post-cardiac arrest syndrome. The brain appears to be one of the most vulnerable organs to injury during this reperfusion phase and varying degrees of cognitive impairment may be the end result. Inducing mild therapeutic hypothermia has been shown to be protective for the brain in this setting and has been demonstrated to improve neurological recovery. The evidence for this however, is only conclusive in cases where the arrest is in a shockable rhythm i.e. pulseless ventricular tachycardia and ventricular fibrillation.

In 2002, two randomized controlled trials were published showing an improvement in neurological outcomes in patients treated with mild therapeutic hypothermia post resuscitation from shockable cardiac arrest. Therapeutic hypothermia has since been widely adopted by most authorities as part of the comprehensive treatment bundle for post cardiac arrest syndrome. Whether there is any benefit for patients arrested in non-shockable rhythms however, is a matter of controversy. Some have reported improved mortality and better neurological outcomes with therapeutic hypothermia in this patient population. Others have reported no benefit or even a trend towards harm. And although the matter remains controversial, the recommendation still stands for therapeutic hypothermia to be offered for all comatose survivors of cardiac arrest whatever the arrest rhythm.

Most previous reports have examined the differences between shockable and non-shockable rhythms in terms of neurological outcome and mortality rates after therapeutic hypothermia. To our knowledge, no study has examined the differences in outcome between the two types of non-shockable rhythms, that is pulseless electrical activity (PEA) and asystole. We hypothesize that during PEA arrests, patients may retain some degree of cerebral perfusion and hence have better neurological outcomes post-resuscitation. That is in contrast to asystole where patients are likely to have no cerebral perfusion. In this study we attempt to detect any possible differences in neurological recovery (as indicated by the Cerebral Performance Category scale on hospital discharge) after therapeutic hypothermia, between patients arrested in PEA arrest and those arrested in asystole.

Typ studie

Pozorovací

Zápis (Očekávaný)

400

Kontakty a umístění

Tato část poskytuje kontaktní údaje pro ty, kteří studii provádějí, a informace o tom, kde se tato studie provádí.

Studijní místa

    • Ontario
      • London, Ontario, Kanada, N6A 5A5
        • University Hospital, London Health Sciences Centre, University of Western Ontario
      • London, Ontario, Kanada, N6A 5W9
        • Victoria Hospital, London Health Sciences Centre, University of Western Ontario

Kritéria účasti

Výzkumníci hledají lidi, kteří odpovídají určitému popisu, kterému se říká kritéria způsobilosti. Některé příklady těchto kritérií jsou celkový zdravotní stav osoby nebo předchozí léčba.

Kritéria způsobilosti

Věk způsobilý ke studiu

18 let až 90 let (Dospělý, Starší dospělý)

Přijímá zdravé dobrovolníky

Ne

Pohlaví způsobilá ke studiu

Všechno

Metoda odběru vzorků

Vzorek nepravděpodobnosti

Studijní populace

All patients admitted to the intensive care unit (ICU) with a diagnosis of postcardiac arrest between Jan 2008 and Dec 2012 will be examined.

Popis

Inclusion Criteria:

  • Admission to adult ICU (age ≥18 years) at London Health Sciences Centre
  • Primary reason for ICU admission: postcardiac arrest
  • Both in-hospital and out-of-hospital cardiac arrest will be included
  • ICU admission between Jan 2008 and Dec 2012.

Exclusion Criteria:

- ICU admissions primarily for reasons other than cardiac arrest.

Studijní plán

Tato část poskytuje podrobnosti o studijním plánu, včetně toho, jak je studie navržena a co studie měří.

Jak je studie koncipována?

Detaily designu

  • Observační modely: Kohorta
  • Časové perspektivy: Retrospektivní

Kohorty a intervence

Skupina / kohorta
Intervence / Léčba
Shockable arrest
Initial arrest rhythm shockable. This is either pulseless ventricular tachycardia (pulseless VT) or ventricular fibrillation (VF).
No therapeutic hypothermia was induced.
Ostatní jména:
  • No therapeutic hypothermia.
  • Řízení.
Hypothermia was induced after successful resuscitation from cardiac arrest.
Ostatní jména:
  • Podchlazení
  • Induced hypothermia
  • Mild therapeutic hypothermia
  • Chlazení
  • Targeted temperature management
Pulseless electrical activity
Initial arrest rhythm is pulseless electrical activity.
No therapeutic hypothermia was induced.
Ostatní jména:
  • No therapeutic hypothermia.
  • Řízení.
Hypothermia was induced after successful resuscitation from cardiac arrest.
Ostatní jména:
  • Podchlazení
  • Induced hypothermia
  • Mild therapeutic hypothermia
  • Chlazení
  • Targeted temperature management
Asystole
Initial arrest rhythm is asystole.
No therapeutic hypothermia was induced.
Ostatní jména:
  • No therapeutic hypothermia.
  • Řízení.
Hypothermia was induced after successful resuscitation from cardiac arrest.
Ostatní jména:
  • Podchlazení
  • Induced hypothermia
  • Mild therapeutic hypothermia
  • Chlazení
  • Targeted temperature management

Co je měření studie?

Primární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Cerebral performance category score on hospital discharge
Časové okno: Upon discharge from hospital, assessed up to 36 months postcardiac arrest

Neurological outcome on discharge from hospital as defined by the cerebral performance category (CPC) scale. The CPC scale is a 5 point scale. The outcome measure will be dichotomized into good or bad. Good outcome will be equivalent to CPC scores of 1 & 2 (where the patient is independent), and bad outcome will be equivalent to CPC scores of 3, 4 & 5 (where the patient is either dependent or dead).

CPC Scale:

  1. Functioning normally and independent, possibly with a minor disability.
  2. Moderately disabled, still independent.
  3. Conscious but with a severe disability, dependent.
  4. Unconscious (comatose or in a persistent vegetative state).
  5. Brain dead or dead by traditional criteria.
Upon discharge from hospital, assessed up to 36 months postcardiac arrest

Sekundární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Hospital length of stay postcardiac arrest
Časové okno: Days spent in hospital after successful resuscitation from cardiac arrest, assessed up to 36 months from the date of cardiac arrest
Hospital length of stay (LOS) post-cardiac arrest will be calculated from the day of the cardiac arrest to the day of hospital discharge. If prior to the arrest the patient was an inpatient, we will only count the days from the arrest to discharge. Days spent in hospital prior to the arrest will not be included.
Days spent in hospital after successful resuscitation from cardiac arrest, assessed up to 36 months from the date of cardiac arrest
Intensive care unit length of stay postcardiac arrest
Časové okno: Days spent in the intensive care unit after successful resuscitation from cardiac arrest, assessed up to 36 months from the date of cardiac arrest
The length of stay (LOS) in the intensive care unit (ICU) in days, after successful resuscitation from cardiac arrest.
Days spent in the intensive care unit after successful resuscitation from cardiac arrest, assessed up to 36 months from the date of cardiac arrest
Neurological status after hospital discharge
Časové okno: Assessed up to 12 months from hospital discharge
Neurological status as documented on the patient's first outpatient clinic visit, assessed up to 12 months from hospital discharge. This will be analyzed as a secondary outcome only if enough data is generated on chart review.
Assessed up to 12 months from hospital discharge

Další výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Time to obeying commands
Časové okno: Assessed up to 21 days postcardiac arrest
Total time in days from the cardiac arrest until the patient is able to obey commands, as documented in the patient's chart.
Assessed up to 21 days postcardiac arrest
Documented negative neurological prognosticators
Časové okno: Upon withdrawal of life support, assessed up to 3 months postcardiac arrest

For patient's in which the reason for withdrawal of life support is poor neurological outcome, the number of negative neurological prognosticators recorded in the chart will be examined.

Examples of negative prognosticators include: negative somatosensory evoked potentials on post arrest day 3, post arrest status epilepticus, absent brain stem reflexes beyond post arrest day 2... etc.

Upon withdrawal of life support, assessed up to 3 months postcardiac arrest
Post arrest neurological investigations (including imaging studies)
Časové okno: Performed within 21 days from cardiac arrest
All neurological investigations done within 21 days from cardiac arrest will be examined including electroencephalograms, somatosensory evoked potentials, brain magnetic resonance imaging, brain computerized tomography (CT) scans... etc.
Performed within 21 days from cardiac arrest

Spolupracovníci a vyšetřovatelé

Zde najdete lidi a organizace zapojené do této studie.

Vyšetřovatelé

  • Vrchní vyšetřovatel: Eyad Althenayan, MD, Western University, Canada
  • Ředitel studie: Philip Jones, MD, FRCPC, Western University, Canada
  • Studijní židle: Bryan Young, MD, FRCPC, Western University, Canada
  • Ředitel studie: Ahmed F Hegazy, MD, FRCPC, Western University, Canada
  • Ředitel studie: Ana Igric, MD, FRCSC, Western University, Canada
  • Ředitel studie: Carolyn Benson, MD, Western University, Canada

Publikace a užitečné odkazy

Osoba odpovědná za zadávání informací o studiu tyto publikace poskytuje dobrovolně. Mohou se týkat čehokoli, co souvisí se studiem.

Obecné publikace

Termíny studijních záznamů

Tato data sledují průběh záznamů studie a předkládání souhrnných výsledků na ClinicalTrials.gov. Záznamy ze studií a hlášené výsledky jsou před zveřejněním na veřejné webové stránce přezkoumány Národní lékařskou knihovnou (NLM), aby se ujistily, že splňují specifické standardy kontroly kvality.

Hlavní termíny studia

Začátek studia

1. ledna 2014

Primární dokončení (Očekávaný)

1. prosince 2014

Dokončení studie (Očekávaný)

1. února 2015

Termíny zápisu do studia

První předloženo

4. ledna 2014

První předloženo, které splnilo kritéria kontroly kvality

9. ledna 2014

První zveřejněno (Odhad)

13. ledna 2014

Aktualizace studijních záznamů

Poslední zveřejněná aktualizace (Odhad)

13. ledna 2014

Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality

9. ledna 2014

Naposledy ověřeno

1. ledna 2014

Více informací

Tyto informace byly beze změn načteny přímo z webu clinicaltrials.gov. Máte-li jakékoli požadavky na změnu, odstranění nebo aktualizaci podrobností studie, kontaktujte prosím register@clinicaltrials.gov. Jakmile bude změna implementována na clinicaltrials.gov, bude automaticky aktualizována i na našem webu .

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