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The effect of intravenous lactate on cerebral function during hypoglycaemia
P King1, H Parkin, I A Macdonald
1Diabetes Unit, University Hospital, Nottingham, UK.
Summary
Intravenous lactate infusion protected brain function during induced hypoglycemia. This finding suggests lactate may be a therapeutic agent to prevent cerebral dysfunction in intensive insulin therapy.
Area of Science:
- Neuroscience
- Endocrinology
- Metabolic Research
Background:
- Hypoglycemia, a common complication of intensive insulin therapy, can cause cerebral dysfunction.
- Identifying protective factors against hypoglycemia-induced brain dysfunction is crucial for therapeutic development.
Purpose of the Study:
- To investigate the neuroprotective effects of intravenous lactate during experimentally induced hypoglycemia.
- To determine if lactate administration mitigates cerebral dysfunction markers at low blood glucose levels.
Main Methods:
- Nine healthy volunteers underwent hyperinsulinemic clamps to achieve target blood glucose levels (4.5, 3.3, 2.5 mmol/L).
- Cerebral function was assessed using four-choice reaction time, Auditory Brain Stem Response (ABR), and P300 latency.
- Participants received either sodium lactate or normal saline infusion during separate clamp sessions.
Main Results:
- Lactate infusion prevented the slowing of reaction time observed with saline at 3.3 mmol/L glucose.
- At 2.5 mmol/L glucose, saline infusion significantly impaired reaction time, ABR, and P300, while lactate infusion did not.
- Lactate was associated with reduced stress hormone responses (noradrenaline, adrenaline, growth hormone) at 2.5 mmol/L glucose.
Conclusions:
- Intravenous lactate demonstrates significant neuroprotective effects against hypoglycemia-induced cerebral dysfunction.
- Lactate may serve as a therapeutic strategy to preserve brain function during severe hypoglycemia.
- Further research into lactate's role in managing hypoglycemia is warranted.