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[Changes in the myocardial catecholamines in experimental stress and during assisted circulation]
Zeitschrift Fur Experimentelle Chirurgie
|January 1, 1978
Summary
Stress impacts myocardial catecholamines differently in rats and dogs. Immobilization stress decreased noradrenaline in rats, while coronary occlusion in dogs showed reduced catecholamines in the left atrium but not the injured left ventricle during bypass.
Area of Science:
- Cardiovascular Physiology
- Neuroendocrinology
- Stress Physiology
Context:
- Myocardial catecholamines play a crucial role in cardiac function and response to stress.
- Understanding catecholamine shifts during stress is vital for managing cardiovascular conditions.
- Experimental models in rats and dogs provide insights into stress-induced cardiac changes.
Purpose:
- To investigate the effects of immobilization stress on myocardial catecholamine levels in rats.
- To examine myocardial catecholamine alterations in dogs experiencing stress from coronary occlusion.
- To evaluate the impact of mechanical circulatory support on catecholamine concentrations in stressed canine hearts.
Summary:
- Immobilization stress in rats led to decreased myocardial noradrenaline, which normalized over time, while adrenaline showed opposite changes.
- In dogs with experimentally induced coronary occlusion, 120 minutes of left-sided bypass support reduced left atrial catecholamines.
- Catecholamine levels in the infarcted left ventricular myocardium of dogs remained unchanged after assisted circulation, suggesting localized effects.
Impact:
- Findings suggest myocardial catecholamines may serve as a parameter for assessing the efficacy of assisted circulation.
- The study supports the potential utility of left-sided bypass systems in managing cardiac stress and injury.
- This research contributes to a deeper understanding of the neurochemical responses of the heart to various forms of stress.