Overview: Few pathologie phenomena, as shock, can originate from so many causes and involve so many complex physiologie mechanisms: The complexity of the phenomenon, thus, has resulted in extensive study and raised many uncertainties. Different conditions, such as hemorrhage, trauma, burns, bacterial infection, and anaphylaxis, can cause a shock state which initiates a chain of biochemical events that tends to maintain the shock. Recent progress in bio- chemistry, physiology, and pharmacology has tended to clarify this chain of events, and elucidate the possible trigger mechanism. Besides the
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