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Beating Normal

Fibrillating

Arrested

Fig. 1. Influence of temperature on myocardial metabolism. Although it is expected that hypothermia decreases myocardial oxygen consumption in the beating and fibrillating heart, there also exists a significant difference between the normothermic and hypothermic arrested heart. This indicates that the heart still has a measurable oxygen demand while arrested. Also notable is the difference in myocardial oxygen consumption between the fibrillating and arrested heart at either temperature.

Beating Normal

Fibrillating

Arrested

Fig. 1. Influence of temperature on myocardial metabolism. Although it is expected that hypothermia decreases myocardial oxygen consumption in the beating and fibrillating heart, there also exists a significant difference between the normothermic and hypothermic arrested heart. This indicates that the heart still has a measurable oxygen demand while arrested. Also notable is the difference in myocardial oxygen consumption between the fibrillating and arrested heart at either temperature.

cardiac arrest differ in their degrees of MVO2 reduction. In all cases, the arrested heart still has an oxygen demand; hence, there will always be an imbalance of oxygen demand and delivery (i.e., some degree of ischemia).

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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