A client is prescribed tetrahydrozoline (Tyzine) for redness of the eye. Which rationale supports the use of this medication?
1. Constriction of the pupil
2. Absorption of fluid in the conjunctival sac
3. Vasoconstriction of the arterioles in the eye
4. Relaxation of the radial muscles of the iris
Correct Answer: 3
Rationale 1: Tetrahydrozoline (Tyzine) activates the alpha-1 adrenergic receptors on the radial muscle and contracts the radial muscle, causing pupillary dilation.
Rationale 2: Because of alpha-1 receptor activation, tetrahydrozoline (Tyzine) causes vasoconstriction of the vessels in the eye. There is no absorption of fluid in the conjunctival sac.
Rationale 3: Because of alpha-1 receptor activation, tetrahydrozoline (Tyzine) causes vasoconstriction of the vessels in the eye, reducing the conjunctival congestion and redness.
Rationale 4: Tetrahydrozoline (Tyzine) activates the alpha-1 adrenergic receptors on the radial muscle of the iris and causes contraction of the radial muscle, leading to pupillary dilation.
Global Rationale: Because of alpha-1 receptor activation, tetrahydrozoline (Tyzine) causes vasoconstriction of the vessels in the eye, reducing the conjunctival congestion and redness. This medication will also cause papillary dilation, not constriction. There is no absorption of fluid in the conjunctival sac.
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