Pharmacology - Opthalmology Drugs Flashcards Preview

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Flashcards in Pharmacology - Opthalmology Drugs Deck (20):
1

What drug is recommended for quick dilation of eyes - eye exam?

Tropicamide

Antimuscarinic agent

2

What are the effects of antimuscarinic agents on the eye?

Pupillary dilation
Paralysis of the ciliary body

Use for eye exams

3

Class: Timolol

Non-specific beta blocker

4

What are the contraindications for Timolol?

CHF, asthma, bradycardia

5

Class: Latanaprost

Prostaglandin

6

What are the contraindications for Latanaprost?

Cystoid macular edema;
Herpes

7

Class: Brimondine

Alpha-2-agonist

8

What are the contraindications for Brimondine?

If it's used with MAO inhibitor can cause fatigue/drowsiness

9

Class: Dorzolamide

Carbonic anhydrase inhibitor

10

What are the contraindications for Dorzolamide?

Allergies to sulfonamides

11

How do you test for the type of lesion seen in Horner's syndrome (as in, pre vs. postganglionic)?

Paradrine 1% (hydroxyamphetamine) causes pupillary dilation when 3rd order neuron is intact.

If one gives Paredrine and notes pupillary dilatation, then the lesion is at the level of the 1st or 2nd order neuron, as the 3rd order neuron is intact, but not receiving a stimulus. If the pupil does not dilate with paredrine, then the 3rd order neuron is dysfunctional signifying a more benign process.

12

What is Adie's syndrome?

aka Tonic pupil

Adie’s syndrome is characterized by a dilated pupil with sector palsies of the pupillary sphincter. It is a benign syndrome, and thought to result from a viral infection or trauma to the ciliary ganglion.

13

Methacholine 2.5% or pilocarpine 1/8% are direct agonists of:

Methacholine 2.5% or pilocarpine 1/8% are direct agonists of the parasympathetic system which under normal circumstances do not produce pupillary constriction.

It is not until the pilocarpine is at 1% concentration or the methacholine at 10% that constriction takes place in the heathly individual.

In Adies syndrome, these agents will produce pupillary constriction confirming the diagnosis.

14

If a patient's pupil did not constrict with 1% pilocarpine, what is the likely cause?

Pharmacalogic blockade

Cycloplegics are muscarinic antagonists which combine with postsynaptic receptors to block the action of acetylcholine. Cycloplegics come in varying strengths and duration and are used commonly by ophthalmologists to facilitate eye examinations.

15

What are the tests for Adie's syndrome?

Pilocarpine 1/8%
Methacholine 2.5%

Pupil will constrict

16

What are the tests for Horner's syndrome?

Paradrine 1% - if lesion preganglionic, pupil dilates
if lesion is postganglionic, pupil does not dilate

17

What are the adverse effects of the cholinergics/anticholinesterases such as pilocarpine and echothiophate?

Respiratory - Bronchospasm
Gastrointestinal - Salivation, nausea, vomiting, diarrhea, abdominal pain, tenesmus
Miscellaneous - Lacrimation, sweating
SLUDGE

18

What are the adverse effects of the anticholinergics such as atropine?

Neurologic - Ataxia, nystagmus, restlessness, mental confusion, hallucination, violent and aggressive behavior
Miscellaneous - Insomnia, photophobia, urinary retention

19

What are the adverse effects of the adrenergics, such as epinephrine and phenylephrine?

Cardiovascular - Extrasystoles, palpitation, hypertension, myocardial infarction
Miscellaneous - Trembling, paleness, sweating

20

What are the adverse effects of the beta-blockers such as timolol?

Cardiovascular - Bradycardia, hypotension, syncope, palpitation, congestive heart failure

Respiratory - Bronchospasm

Neurologic - Mental confusion, depression, fatigue, lightheadedness, hallucinations, memory impairment, sexual dysfunction

Miscellaneous - Hyperkalemia

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