Details

Autor(en) / Beteiligte

• Lindner, Karl H
• Ahnefeld, Friedrich W
• Pfenninger, Ernst G
• Schuermann, Winfried
• Bowdler, Ingrid M

Titel

Effects of epinephrine and norepinephrine on cerebral oxygen delivery and consumption during open-chest CPR

Ist Teil von

• Annals of emergency medicine, 1990-03, Vol.19 (3), p.249-254

Ort / Verlag

United States: Mosby, Inc

Erscheinungsjahr

1990

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• The effect of epinephrine and norepinephrine on cerebral oxygen delivery and consumption after five minutes of cardiopulmonary arrest and three minutes of open-chest cardiac massage was studied in 21 pigs. Norepinephrine, like epinephrine, has a marked α- and β 1-sympathomimetic activity, but compared with epinephrine, the degree of β 2-stimulation is weak. Epinephrine probably stimulates cerebral oxygen and glucose consumption by its β 2-adrenergic effect. After three minutes of CPR, three groups of seven animals each blindly received either placebo (control group), 45 μg/kg epinephrine, or 45 μg/kg norepinephrine. During CPR but before drug administration, cerebral blood flow was 23 ± 14 mL/min/100 g in the control group, 30 ± 7 mL/min/100 g in the epinephrine group, and 30 ± 11 mL/min/100 g in the norepinephrine group. At 90 seconds after epinephrine, cerebral blood flow increased to 54 ± 14 mL/min/100 g and after norepinephrine, to 58 ± 22 mL/min/100 g ( P < .05). Cerebral perfusion pressure for both drugs was significantly higher than the control group. Compared with mechanical measures alone, cerebral oxygen delivery rose from 4.3 ± 1.2 to 7.4 ± 1.7 mL/min/100 g after epinephrine and from 3.7 ± 1.4 to 7.3 ± 2.7 mL/min/100 g after norepinephrine ( P < .05). There was no increase in cerebral oxygen consumption after both catecholamines, and cerebral oxygen extraction ratio decreased. Cerebral glucose delivery increased in relation to glucose consumption, and extraction ratio did not change significantly after both catecholamines. Our study indicates that the effects of either epinephrine or norepinephrine at a dose of 45 μg/kg during open-chest CPR on the cerebral delivery and on the consumption of oxygen and glucose do not differ significantly.