CLT Cooling & Pain Management 2

Question 1

Which cooling method uses a cryogen spray delivered in short bursts immediately before each laser pulse?

Accepted Answer

Dynamic cooling device (DCD)

Answer

A dynamic cooling device (DCD) delivers millisecond bursts of cryogen spray (typically tetrafluoroethane) just before each laser pulse to selectively cool the epidermis.

Question 2

What is the primary risk of applying ice directly to skin immediately before laser treatment?

Accepted Answer

It can cause frostbite and vasoconstriction that alters treatment response

Answer

Direct ice contact can cause frostbite and vasoconstriction, which alters blood vessel visibility and changes tissue optical properties, affecting treatment outcomes.

Question 3

A patient requests topical anesthetic for full-leg laser hair removal. Which application protocol is most appropriate?

Accepted Answer

Apply 45–60 minutes before under occlusive wrap

Answer

Topical anesthetics like EMLA or LMX4 require 45–60 minutes of contact time under an occlusive wrap to achieve adequate dermal anesthesia.

Question 4

During contact cooling, the sapphire or quartz tip must maintain firm contact with the skin to:

Accepted Answer

Ensure consistent thermal conduction and epidermal protection

Answer

Firm contact ensures consistent thermal conduction between the cooled tip and the epidermis, maintaining protective cooling throughout laser delivery.

Question 5

Forced cold air cooling (e.g., Zimmer Cryo) is advantageous over contact cooling in which scenario?

Accepted Answer

Treating vascular lesions where vessel compression is undesirable

Answer

Forced cold air cooling avoids compressing target vessels, making it ideal for vascular lesion treatments where blood must remain in the vessel for effective photothermolysis.

(CLT) Certified Laser Technician Practice Test

(CLT) Certified Laser Technician Practice Test

CLT Cooling & Pain Management 2