Abstract:
OBJECTIVE:The aim of the current study was to assess the effects of epinephrine in a pig model of hypothermic cardiac arrest followed by closed-chest cardiopulmonary resuscitation combined with active rewarming, simulating the clinical management of an arrested hypothermic patient in a hospital without cardiopulmonary bypass facilities. DESIGN:Prospective, randomized animal study. SETTING:University research laboratory. SUBJECTS:Twelve 12- to 16-week-old domestic pigs. INTERVENTIONS:Pigs were surface cooled to a body core temperature of 28 degrees C. After 4 min of untreated cardiac arrest, manual closed-chest CPR and thoracic lavage with 40 degrees C warmed fluid were started. After 3 min of external chest compression animals were randomly assigned to receive epinephrine (45, 45 and 200 microg/kg) or saline placebo in 5-min intervals. MEASUREMENTS AND MAIN RESULTS:Coronary perfusion pressure was about 15 mmHg in placebo group pigs. Coronary perfusion pressure was significantly higher after epinephrine, but restoration of spontaneous circulation was not more frequent (one of six epinephrine versus three of six saline placebo pigs, P=0.34). After 45 microg/kg epinephrine the arterial PO(2) was significantly lower when compared to the saline placebo. The third 200 microg/kg epinephrine dose resulted in a significantly enhanced mixed venous hypercarbic acidosis. CONCLUSIONS:After a short 4-min period of hypothermic cardiac arrest, epinephrine may not be necessary to maintain coronary perfusion pressure around the threshold usually correlating with successful defibrillation, even during prolonged closed-chest CPR combined with active rewarming. The enhanced mixed venous hypercarbic acidosis in epinephrine-treated animals may support the argument against repeated or high dose epinephrine administration during hypothermic CPR.
journal_name
Resuscitationjournal_title
Resuscitationauthors
Kornberger E,Lindner KH,Mayr VD,Schwarz B,Rackwitz KS,Wenzel V,Krismer AC,Mair Pdoi
10.1016/s0300-9572(01)00353-7keywords:
subject
Has Abstractpub_date
2001-09-01 00:00:00pages
301-8issue
3eissn
0300-9572issn
1873-1570pii
S0300957201003537journal_volume
50pub_type
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