CLT Vascular & Pigmented Lesion Treatment 3

Question 1

Which laser system is FDA-cleared and most commonly used for treating spider veins (leg telangiectasias) on fair-skinned patients?

Accepted Answer

Nd:YAG laser at 1064 nm

Answer

CO2 laser at 10,600 nm

Answer

Excimer laser at 308 nm

Answer

Diode laser at 810 nm with high fluence

Question 2

Post-inflammatory hyperpigmentation (PIH) after pigmented lesion treatment is best prevented by:

Accepted Answer

Pre-treating with topical hydroquinone and sun avoidance

Answer

Increasing fluence to complete treatment in fewer sessions

Answer

Using epidermal cooling only after the procedure

Answer

Skipping test spots and proceeding directly to full treatment

Question 3

The principle of selective photothermolysis requires that pulse duration be:

Accepted Answer

Equal to or shorter than the thermal relaxation time of the target

Answer

Longer than the thermal relaxation time of the target

Answer

Independent of the target's thermal relaxation time

Answer

At least 10 times the thermal relaxation time

Question 4

Which condition is an absolute contraindication to laser treatment of vascular lesions?

Accepted Answer

Active cutaneous infection or open wound at the treatment site

Answer

History of mild sunburn

Answer

Patient age over 60

Answer

Previous treatment with topical retinoids

Question 5

A patient develops milia 4 weeks after laser treatment of a vascular birthmark. The most likely cause is:

Accepted Answer

Occlusion of hair follicles during wound healing

Answer

Allergic reaction to topical anesthetic

Answer

Laser-induced hyperpigmentation

Answer

Over-aggressive cooling that froze the skin

Question 6

When treating a nevus of Ota, which laser modality provides the most effective removal with lowest risk of scarring?

Accepted Answer

Q-switched Nd:YAG at 1064 nm

Answer

Long-pulsed alexandrite

Answer

Pulsed dye laser at 595 nm

Answer

Fractional CO2 laser

Question 7

Dynamic cooling devices (DCD) used with pulsed dye laser primarily protect which skin structure?

Accepted Answer

The epidermis

Answer

Dermal collagen

Answer

Subcutaneous fat

Answer

Sebaceous glands