Abstract:
:In a postasphyxia neonatal lamb model, the responses of the cerebral circulation to hypoxic hypoxia and changes in systemic arterial blood pressure were examined. Ventilated newborn lambs (n = 14) were subjected to a gradual asphyxial insult, resuscitated, and returned to control ventilator settings. During the time 2-5 hours after asphyxia, the responses of cerebral blood flow (CBF), cerebral oxygen delivery (OD), cerebral oxygen consumption (CMRO2), and cerebral fractional oxygen extraction (E) to changes in either arterial oxygen content (CaO2) or mean arterial blood pressure (MAP) were assessed. These data were compared with measurements from nonasphyxiated lambs (n = 7). With hypoxia (n = 7), cerebral blood flow increased (CBF = 646/CaO2 + 44) compared with nonasphyxiated lambs (CBF = 1121/CaO2 + 11). In asphyxiated lambs, cerebral oxygen delivery decreased (OD = 0.41 CaO2 + 6.87), but cerebral oxygen consumption remained stable due to a proportional increase in cerebral fractional oxygen extraction (E = -0.014 CaO2 + 0.65). In nonasphyxiated lambs, cerebral oxygen delivery, consumption, and fractional extraction were unchanged with hypoxia. In response to alterations in blood pressure, both cerebral blood flow (CBF = 0.84 MAP + 6.62) and oxygen delivery (OD = 0.13 MAP + 0.77) were pressure-passive. With hypotension, cerebral fractional oxygen extraction increased (E = -0.003 MAP + 0.69) but not enough to prevent a decrease in cerebral oxygen consumption (CMRO2 = 0.042 MAP + 1.79). In nonasphyxiated lambs, cerebral blood flow, oxygen delivery, consumption, and fractional extraction did not vary with blood pressure.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
Strokejournal_title
Strokeauthors
Rosenberg AAdoi
10.1161/01.str.19.2.239subject
Has Abstractpub_date
1988-02-01 00:00:00pages
239-44issue
2eissn
0039-2499issn
1524-4628journal_volume
19pub_type
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