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[Effects of fructose on left ventricular function during hypoxia]
Masui. the Japanese Journal of Anesthesiology
|June 1, 1994
Summary
Fructose infusion during hypoxia worsened cardiac function and metabolism in dogs, leading to higher mortality and lower arterial pH compared to saline. Myocardial glucose uptake increased with fructose.
Area of Science:
- Cardiology
- Metabolic Research
- Hypoxia Studies
Background:
- Hypoxia significantly impacts cardiac function and myocardial metabolism.
- Understanding substrate utilization during low oxygen is crucial for cardiac health.
- Fructose's role in myocardial metabolism under stress requires further investigation.
Purpose of the Study:
- To compare the effects of fructose versus saline infusion on cardiac function and myocardial metabolism during induced hypoxia.
- To evaluate survival rates and key metabolic markers in dogs under hypoxic conditions with different infusions.
Main Methods:
- Mongrel dogs were subjected to induced hypoxia (PaO2 = 15 mmHg) for two hours.
- Intravenous infusions of fructose (1 g.kg-1.h-1) or saline (5 ml.kg-1.h-1) were administered.
- Cardiac function (LV dp/dt max), blood glucose, lactic acid, and arterial pH were monitored.
Main Results:
- Fructose infusion led to higher mortality rates compared to saline.
- Blood lactic acid levels increased significantly in both groups, but were higher in the fructose group.
- Arterial pH decreased more in the fructose group, and myocardial glucose uptake tended to be higher.
Conclusions:
- Fructose infusion exacerbates cardiac dysfunction and metabolic derangement during hypoxia.
- Fructose may impair cardiac function under hypoxic stress, indicated by increased lactic acid and decreased pH.
- Survival is significantly reduced with fructose administration during severe hypoxia.