Describe the relationship between perfusion, ischemia, ...

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Describe the relationship between perfusion, ischemia, infarction, and necrosis.
 
  What will be an ideal response?

Question 2

Compare and contrast the combining forms phagia and phasia. Give examples of contextual clues that will help you distinguish between the use of dysphagia and dysphasia. Give an example of a condition that causes dysphasia.
 
  What will be an ideal response?

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Answer to Question 1

Perfusion refers to the flow of oxygenated blood through a tissue. Ischemia results when there is too little perfusion, causing an oxygen deficit. Infarction is complete lack of perfusion and a complete lack of oxygen. Necrosis, or tissue death, results from a period of oxygen starvation due to no perfusion.

Answer to Question 2

The combining form phagia means to eat or swallow. The combining form phasia refers to the ability to speak. Contextual clues for dysphagia would be difficulty swallowing, difficulty eating, or a reference to an upper GI tract disorder. Dysphasia is a neurological disorder caused by a brain lesion, not a problem localized to the upper GI tract. Dysphasia often follows a stroke (cerebrovascular accident) or other type of brain injury. Contextual clues for dysphasia might include CVA, stroke, cerebral hemorrhage, or a reference to a neurological disorder.

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