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The pig as a model for myocardial ischemia and exercise
Laboratory Animal Science
|August 1, 1986
Summary
Pigs, particularly Yucatan miniature swine, serve as excellent models for studying human coronary physiology and exercise. Their limited collateral circulation makes them ideal for research into developing coronary collateral circulation.
Area of Science:
- Cardiovascular Physiology
- Comparative Physiology
- Exercise Physiology
Background:
- Pigs are established models for coronary physiology, collateral circulation, and exercise studies.
- Yucatan miniature swine and young farm pigs were compared for their utility in myocardial ischemia, infarction, and exercise research.
Purpose of the Study:
- To evaluate Yucatan miniature swine and young farm pigs as models for human coronary physiology, collateral circulation, and exercise.
- To compare the exercise capacity and physiological responses of different pig breeds.
Main Methods:
- Comparative analysis of Yucatan miniature swine and Hampshire pigs regarding exercise capacity.
- Assessment of maximal oxygen consumption (VO2 max) changes after a 10-week training program.
- Induction of myocardial ischemia and infarction through acute and slow coronary artery occlusion.
Main Results:
- Yucatan pigs demonstrated greater exercise capacity than Hampshire pigs, attributed to higher hematocrit and larger heart size.
- Both breeds achieved a 25% increase in VO2 max after 10 weeks of training.
- Acute coronary occlusion led to extensive infarction, while slow occlusion resulted in limited infarction (5%) due to collateral dependence.
Conclusions:
- Yucatan miniature swine are suitable models for human coronary physiology and exercise studies.
- The pig's collateral circulation is limited, similar to humans, making it a valuable model for studying collateral development.
- Slow coronary occlusion in pigs effectively creates a model for investigating ischemia and collateral-dependent vascular beds relevant to human conditions.