CLT Cooling & Pain Management 3

Question 1

Methemoglobinemia is a rare but serious adverse effect associated with which topical anesthetic?

Accepted Answer

Prilocaine and benzocaine

Answer

Prilocaine and benzocaine can oxidize hemoglobin to methemoglobin, reducing oxygen-carrying capacity; this risk is elevated in infants and with large application areas.

Question 2

The 'pre-cooling, parallel cooling, post-cooling' sequence refers to:

Accepted Answer

Cooling the skin before, during, and after each laser pulse to maximize epidermal protection

Answer

This sequence describes a comprehensive cooling strategy where epidermal protection is maintained before the pulse (pre), during the pulse (parallel), and immediately after (post) to minimize thermal injury.

Question 3

What distinguishes nerve blocks from topical anesthetics in the context of laser procedures?

Accepted Answer

Nerve blocks anesthetize entire anatomic regions and have longer duration than topical agents

Answer

Nerve blocks (regional anesthesia) anesthetize larger anatomic territories and last longer than topical agents but must be administered by qualified medical personnel.

Question 4

Which parameter determines the thermal relaxation time of the epidermis, which cooling systems are designed to exploit?

Accepted Answer

Epidermal thickness and thermal diffusivity

Answer

The thermal relaxation time of the epidermis depends on its thickness (~60–100 µm) and thermal diffusivity, which cooling devices use to selectively remove heat before it damages epidermal cells.

Question 5

A patient with a sulfa drug allergy asks about topical anesthetics. Which agent should be used with caution or avoided?

Accepted Answer

Benzocaine

Answer

Benzocaine is a para-aminobenzoic acid (PABA) ester with cross-reactivity potential in patients allergic to sulfonamides; lidocaine and prilocaine are amides with no sulfa cross-reactivity.

(CLT) Certified Laser Technician Practice Test

(CLT) Certified Laser Technician Practice Test

CLT Cooling & Pain Management 3