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[Pharmacological correction of cerebral circulation in experimental acute myocardial ischemia]
Insights
Myocardial ischemia reduced brain circulation in cats. Certain drugs like strophanthine and curantyl helped restore compensatory brain blood flow mechanisms.
Area of Science:
- Cardiovascular Physiology
- Cerebrovascular Regulation
Context:
- Acute myocardial ischemia in anesthetized cats.
- Investigating the impact of ischemia on total brain circulation.
Purpose:
- To evaluate the effects of specific pharmacological agents on cerebral blood flow during myocardial ischemia.
- To understand the mechanisms underlying cerebral circulatory changes during ischemia.
Summary:
- Myocardial ischemia caused reduced brain circulation due to increased cerebrovascular resistance and lower perfusion pressure.
- Administration of curantyl, euphylline, and nonachlazine mitigated this reduction by alleviating cerebrovascular constriction.
- Strophanthine, alone or with curantyl, prevented significant alterations in brain blood supply, suggesting restoration of compensatory mechanisms.
Impact:
- Highlights the protective role of strophanthine and curantyl in maintaining cerebral perfusion during ischemic events.
- Provides insights into pharmacological interventions for managing brain blood flow compromise during cardiac emergencies.
Abstract:
In acute experiments on anesthetized cats myocardial ischemia led to a reduction of the total brain circulation because of the increased resistance of brain vessels and lowered perfusion pressure. After administering curantyl, euphylline and nonachlazine myocardial ischemia brought about less pronounced decrease of the total brain circulation largely at the expense of elimination of brain vessels constriction. After administering strophanthine alone or combined with curantyl myocardial ischemia did not lead to any essential alterations in brain blood supply. It is likely that strophanthine and curantyl recover the compensatory mechanisms of the brain vessels lost during acute myocardial ischemia.