An auto mechanic accidentally has battery acid splashed in his eyes. His coworkers irrigate his eyes with water for 20 minutes, and then take him to the emergency department of a nearby hospital, where he receives emergency care for corneal injury. The physician prescribes dexamethasone (Maxidex Ophthalmic Suspension), two drops of 0.1% solution to be instilled initially into the conjunctival sacs of both eyes every hour; and polymyxin B sulfate (Neosporin Ophthalmic), 0.5% ointment to be placed in the conjunctival sacs of both eyes every 3 hours. Dexamethasone exerts its therapeutic effect by:
a. increasing the exudative reaction of ocular tissue.
b. decreasing leukocyte infiltration at the site of ocular inflammation.
c. inhibiting the action of carbonic anhydrase.
d. producing a miotic reaction by stimulating and contracting the sphincter muscles of the iris.
Answer B.
Dexamethasone exerts its therapeutic effect by decreasing leukocyte infiltration at the site of ocular inflammation. This reduces the exudative reaction of diseased tissue, lessening edema, redness, and scarring. Dexamethasone and other anti-inflammatory agents don’t inhibit the action of carbonic anhydrase or produce any type of miotic reaction.
a. increasing the exudative reaction of ocular tissue.
b. decreasing leukocyte infiltration at the site of ocular inflammation.
c. inhibiting the action of carbonic anhydrase.
d. producing a miotic reaction by stimulating and contracting the sphincter muscles of the iris.
Answer B.
Dexamethasone exerts its therapeutic effect by decreasing leukocyte infiltration at the site of ocular inflammation. This reduces the exudative reaction of diseased tissue, lessening edema, redness, and scarring. Dexamethasone and other anti-inflammatory agents don’t inhibit the action of carbonic anhydrase or produce any type of miotic reaction.