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Understanding Topical Anesthetics

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Questions and Answers

What is the primary effect of local anesthetics on nerve impulses?

They increase the conduction of nerve impulses along nerve fibres

They amplify the strength of nerve impulses along nerve fibres

They change the direction of nerve impulses along nerve fibres

They block the conduction of nerve impulses along nerve fibres (correct)

Which of the following is NOT a property of an ideal topical anesthetic?

Effective for a reasonable duration

Non-toxic

Quick in onset

Interacts with other drugs (correct)

What is the primary advantage of using anesthetics in ophthalmology and optometric procedures?

They reduce the risk of hypersensitivity reactions

They increase the accuracy of tonometry

They allow for more efficient procedures (correct)

They reduce the cost of the procedure

What is a potential disadvantage of using anesthetics in ophthalmology procedures?

They may cause hypersensitivity reactions Signup and view all the answers

Which of the following is an indication for the use of anesthetics?

Contact lens fitting Signup and view all the answers

What is the order of blockade of nerve fibres by local anesthetics?

Pain, touch, temperature, motor Signup and view all the answers

What is the classification of cocaine in terms of anesthetic type?

Ester Signup and view all the answers

What is the probable cause of delayed healing in cases of trauma to corneal epithelium in patients using mydriatics?

Action of preservative in multiuse bottles Signup and view all the answers

What is a major disadvantage of using cocaine as an anesthetic?

Its high toxicity and potential for dependence Signup and view all the answers

What is the result of the influx of sodium ions in nerve transmission?

Depolarization, causing a positive charge Signup and view all the answers

What is a characteristic of amide-type anesthetics?

High lipid solubility and long duration of action Signup and view all the answers

What is the purpose of using proxymetacaine hydrochloride in optometry?

To reduce the discomfort of anesthesia administration Signup and view all the answers

Which type of nerve fibers are more sensitive to blockade by local anaesthetics?

Small nerve fibers Signup and view all the answers

What is the legal status of cocaine for optometrists in practice?

It is not legally available for use Signup and view all the answers

What is the significance of protein binding in local anesthetics?

It affects the duration of action of the anesthetic Signup and view all the answers

What is the primary difference between ester- and amide-type anesthetics?

Their chemical structure Signup and view all the answers

What is the mechanism by which local anaesthetics cause a return to resting potential?

Influx of potassium ions Signup and view all the answers