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Indirect calorimetry in cardiac patients
1Medical Centre Leeuwarden, The Netherlands.
International Journal of Clinical Monitoring and Computing
|January 1, 1988
Summary
Cardiac function significantly impacts metabolism after open heart surgery. Lowered cardiac index leads to reduced energy expenditure and shifts metabolism from fat to carbohydrates, highlighting the need for cardiac assessment in metabolic studies.
Area of Science:
- Cardiology
- Metabolic Medicine
- Postoperative Care
Background:
- Open heart surgery can lead to significant physiological changes.
- Cardiac function plays a crucial role in maintaining metabolic homeostasis.
- Understanding postoperative metabolic alterations is vital for patient recovery.
Purpose of the Study:
- To investigate the relationship between cardiac function and metabolic changes in patients after open heart surgery.
- To identify specific metabolic alterations associated with diminished cardiac index.
- To explore the potential for predicting energy expenditure based on cardiac function.
Main Methods:
- Studied nineteen patients following open heart surgery.
- Monitored cardiac function, specifically cardiac index.
- Assessed metabolic parameters including energy expenditure and respiratory quotient.
Main Results:
- Diminished cardiac index correlated with lower energy expenditure.
- An increased respiratory quotient was observed with reduced cardiac function.
- Metabolism shifted from fat utilization to carbohydrate utilization.
- Protein metabolism remained unaffected.
- These metabolic changes are linked to stagnant hypoxia due to decreased oxygen transport.
Conclusions:
- Cardiac function is a critical determinant of metabolic state post-open heart surgery.
- Assessment of cardiac function is essential for estimating energy expenditure, potentially replacing indirect calorimetry.
- A formula for predicting resting energy expenditure based on cardiac function was developed.