Ver el código de «EBQ:HACA»

{{JC info
| title=Mild Therapeutic [[Hypothermia]]to Improve the Neurologic Outcome After Cardiac Arrest
| abbreviation=HACA
| expansion=[[Hypothermia]]After Cardiac Arrest
| published=2002
| author=Holzer M, et al
| journal=The New England Journal of Medicine
| year=2002
| volume=346
| issue=8
| pages=549-556
| pmid=11856793
| fulltexturl=http://www.nejm.org/doi/full/10.1056/nejmoa012689
| pdfurl=http://www.nejm.org/doi/pdf/10.1056/nejmoa012689
| status = Complete
}}

==Clinical Question==
Does mild hypothermia improve neurologic outcomes compared with standard care normothermia in patients surviving ventricular fibrillation or pulseless ventricular tachycardic arrest?

==Conclusion==
'''In patients who have been successfully resuscitated after cardiac arrest due to ventricular fibrillation, therapeutic mild hypothermia increased the rate of a favorable neurologic outcome and reduced mortality'''

==Major Points== 
{{Therapeutic hypothermia overview}}

==Study Design==
*Randomized, Multicenter, unblinded treatment with blinded final outcome assessment.
*N=275
**Normothermia control group (n=138)
**[[Hypothermia]]treatment group (n=137)
==Population==
*Emergency Department enrollment 
===Patient Demographics===
*Age: 59 yrs  
*Male: 77%
*Witnessed arrest: 99%
*VF or Pulseless VT: 97%
*Bystander CPR: 
**49% normothermic group
**43% hypothermic group
*Thrombolysis after resuscitation: 19%
*Total epinephrine dosing: 3mg
*Location of cardiac arrest:
**Home: 51%
**Public Place: 37%
**Other: 12%

===Inclusion Criteria===
*Witnessed cardiac arrest
*Ventricular fibrillation or nonperfusing ventricular tachycardia as initial cardiac rhythm
*Presumed cardiac origin of the arrest
*Age of 18 to 75 years
*Estimated interval of 5 to 15 minutes from the patient’s collapse to the first attempt at resuscitation 
*No more than 60 minutes from collapse to restoration of spontaneous circulation

===Exclusion Criteria===
Patients were excluded if they met any of the following criteria: 
*Tympanic-membrane temperature below 30°C on admission
*Comatose state before the cardiac arrest due to the administration of drugs that depress the central nervous system
*Pregnancy
*Response to verbal commands after ROSC and before randomization
*[[Hypotension]](mean arterial pressure, less than 60 mm Hg) for more than 30 minutes after ROSC
*Hypoxemia (arterial oxygen saturation, less than 85 percent) for more than 15 minutes after ROSC
*Terminal illness that preceded the arrest
*Factors that made participation in follow-up unlikely
*Enrollment in another study
*Cardiac arrest after the arrival of emergency medical personnel
*Coagulopathy
==Interventions== 
All patients received the same intensive care and were sedated with midazolam and fentanyl as well as maintained on mechanical ventilation.  Pancuronium was used (0.1mg/kg Q2hrs) to reduce shivering.
===[[Hypothermia]]Group===
*The hypothermia group was cooled to 32°C to 34°C using the TheraKool device in order to reach the target bladder temperature within 4 hours and maintained fro 24hs since the start of the cooling.
*Passive rewarming occurred at 24hrs to a normothermic temperature >36° C over a median of 8hrs
*Neurologic outcomes were measured using the Pittsburgh cerebral performance scale.

==Outcomes==
*Analysis was performed using the intention to treat principle
===Primary Outcome===
'''Favorable neurologic outcome at 6 months:'''
*Normothermia group: 39%
*[[Hypothermia]]group: 55% 
:p value = 0.009
:CI 1.08-1.81
:RR 1.4
===Secondary Outcomes=== 
'''6-month mortality'''
*55% Normothermia group
*41% [[Hypothermia]]group
:p value = 0.02
:CI 0.58 - 0.95
:RR  0.74
===Subgroup analysis===
'''Complication Rate during first seven days after cardiac arrest'''
*Normothermia: 70%
*Hypothermia: 73%
:P=0.70

==Criticisms & Further Discussion==
*Although there was no blinding for treating physicians the followup for neurologic assessment was blinded
*Only 8% of all patients assessed for eligibility were included in the trial 
*This trial only established a benefit for the two arrest rhythms of VF and VT with no evidence of PEA
*Similar ICU care was reported in both groups
*The [[EBQ:TTM Trial|TTM Trial]] found no mortality benefit to the 33°C temperature when compared to a normothermic targeted temperature.  Most likely this is due to the fact that both groups were prevented from developing fevers.  The more important treatment strategy for hypothermic arrest may be prevention of the development of fever which enhances the harmful repercussion effects on the brain.

==Funding==
*Grants from Biomedicine and Health Programme (BIOMED 2) implemented under the Fourth RTD Framework Programme of the European Union, Austrian Ministry of Science and Transport, and Austrian Science Foundation.
*Kinetic Concepts provided TheraKool cooling blanket device

==See Also==
{{[[Hypothermia]]Cardiac Arrest Links}}

==Sources==
<references/>

[[Category:EBQ]]
[[Category:Cardiology]]
[[Category:Neurology]]
[[Category:Critical Care]]
[[Category:Featured]]