The effects of hypoglycaemia on cerebral blood flow and metabolism in the new-born calf

The Journal of Physiology
R M Gardiner

Abstract

1. The effects of insulin hypoglycaemia on cerebral blood flow and metabolism have been examined in unanaesthetized, unrestrained calves between 1 and 26 days after birth. 2. Cerebral blood flow was measured with an inert gas technique using molecular hydrogen, and cerebral metabolism was quantified by determination of arterio-cerebral venous (A--V) concentration differences for oxygen, glucose, lactate, pyruvate, acetoacetate, beta-D-hydroxybutyrate and ammonia. 3. During normoglycaemia the mean (A--V) difference for glucose was close to one sixth that of oxygen, on a molar basis. A small net loss of pyruvate from the brain was found, but there was no significant (A--V) difference for lactate. Arterial concentrations of acetoacetate and beta-D-hydroxybutyrate were low, and no utilization of ketone bodies by the brain was demonstrated. 4. Moderate hypoglycaemia (arterial plasma glucose concentration 1--2 m-mole/l.) had no measurable effect on either cerebral blood flow or metabolism. 5. During profound hypoglycaemia (arterial plasma glucose concentration less than 1.0 m-mole/l.) cerebral glucose uptake was sufficient to account for only 56% of the cerebral oxygen consumption. Cerebral oxygen consumption fell in comatose animals...Continue Reading

Citations

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