How does untreated elevated intraocular pressure eventually lead ...

[CharlieWard]

How does untreated elevated intraocular pressure eventually lead to visual impairment?
 
  a. It compresses blood vessels and causes hypoxia of the photoreceptors.
  b. It clouds the lens and prevents light from striking the photoreceptors.
  c. It constricts the pupil and prevents light from entering the posterior chamber.
  d. It pushes the cornea forward and distorts the placement of the image on the retina.

Question 2

A patient who has been prescribed exenatide (Byetta) reports a weight loss of 11 lb in the last month. What is the nurse's best action?
 
  a. Hold the next dose and contact the prescriber immediately.
  b. Ask the patient to keep a daily diary of all foods eaten for the next month.
  c. Reassure the patient that this is an expected effect of the drug and no action is needed.
  d. Instruct the patient to skip one dose of the drug per day and increase his or her daily calories.

[lolol]

Answer to Question 1

A
The photoreceptors of the retina are the part of the sensory nerve that respond to light and enable vision. These receptors require a constant supply of oxygen. Higher than normal intraocular pressure compresses retinal vessels and limits or prevents blood flow to these receptors. As a re-sult of this lack of oxygen, the receptors die and are not replaced. Loss of any photoreceptors reduces vision. Loss of them all causes total blindness.

Answer to Question 2

C
The actions of exenatide include reducing the sensation of hunger and slowing the rate that food leaves the stomach. Both these actions help the patient eat less and lose weight, a desired outcome for patients with type 2 diabetes. An 11-lb pound weight loss in 1 month is not excessive and no action needs to be taken at this time.

[CharlieWard]

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