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Anaesthesia Site Editor
Prime Minister Rank
Posts: 1,741
Join Date: Mar 2005
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6) myocardial oxygen demand -
04-24-2005, 04:00 PM
a) is increased in tachycardia
b) is reduced with a reduction in preload
c) is increased by increased LVEDP
d) extracts 90%of delivered oxygen in the coronary circulation
e) increases can only be met by increased coronary vasodilation
TTFFT
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Revise Medicine Moderator
Senior Consultant Rank
Posts: 262
Join Date: Oct 2005
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10-01-2006, 03:44 PM
c) T
Increased LVEDP increases the workload of the heart thus increasing oxygen demand. About 70% of the delivered oxygen is extracted by the coronary circulation. Any increase in demand can only be met by an increase in perfusion.
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