CLS Vascular Lesion Treatment 2 — Questions and Answers
Question 1: Which laser wavelength is preferred for treating deeper leg veins due to its greater tissue penetration depth?
- 532 nm (KTP)
- 585 nm (PDL)
- 1064 nm (Nd:YAG) (Correct answer)
- 694 nm (Ruby)
Correct answer: 1064 nm (Nd:YAG)
The 1064 nm Nd:YAG laser penetrates deeper into tissue than shorter wavelengths, making it more effective for treating deep leg veins and larger caliber vessels.
Question 2: Which cooling method provides the most consistent and synchronized epidermal protection during vascular laser treatments?
- Ice pack applied before treatment
- Dynamic cooling device (DCD) with cryogen spray (Correct answer)
- Room-temperature contact gel only
- Fan-based air cooling between pulses
Correct answer: Dynamic cooling device (DCD) with cryogen spray
Dynamic cooling devices deliver timed cryogen spray milliseconds before and after each laser pulse, providing precise epidermal protection synchronized with energy delivery.
Question 3: Port wine stains (nevus flammeus) are correctly classified as which type of vascular anomaly?
- Vascular tumors (hemangiomas)
- Capillary malformations (Correct answer)
- Venous malformations
- Lymphatic malformations
Correct answer: Capillary malformations
Port wine stains are congenital capillary malformations — structural abnormalities in capillary development that do not involute spontaneously, unlike hemangiomas.
Question 4: Which Fitzpatrick skin type presents the greatest challenge during vascular laser treatment due to competing chromophore absorption?
- Type I
- Type II
- Type III
- Types V–VI (Correct answer)
Correct answer: Types V–VI
Darker skin types (V–VI) contain abundant epidermal melanin that competes with oxyhemoglobin for laser energy, increasing the risk of dyspigmentation and epidermal burns.
Question 5: For treating small facial telangiectasias (approximately 0.1–0.3 mm in diameter), what is the appropriate pulse duration range based on thermal relaxation time?
- 1–10 microseconds
- 1–10 milliseconds (Correct answer)
- 50–100 milliseconds
- 200–500 milliseconds
Correct answer: 1–10 milliseconds
Small telangiectasias have thermal relaxation times in the 1–10 millisecond range; using pulse durations within this window achieves selective photothermolysis without heat spreading to surrounding tissue.
Question 6: Cherry angiomas (senile angiomas) are most effectively treated with which laser or light source?
- CO2 ablative laser at high fluence
- KTP 532 nm or PDL 585/595 nm (Correct answer)
- Fractional Er:YAG resurfacing laser
- Long-pulsed Nd:YAG 1064 nm exclusively
Correct answer: KTP 532 nm or PDL 585/595 nm
Cherry angiomas are superficial dilated capillary lesions that respond well to visible wavelength lasers (KTP 532 nm or PDL 585/595 nm) targeting their oxyhemoglobin content.
Question 7: What post-treatment response is considered normal and expected after PDL treatment of vascular lesions and should be communicated during patient counseling?
- Immediate permanent blanching with no residual discoloration
- Purpura (bruising) lasting 7–14 days (Correct answer)
- Immediate vesiculation and crusting within hours
- Hyperpigmentation appearing within 24 hours
Correct answer: Purpura (bruising) lasting 7–14 days
PDL characteristically produces purpura that resolves within 7–14 days; patients must be counseled pretreatment that this bruised appearance is a normal and expected treatment outcome.
CLS Vascular Lesion Treatment 2
Which laser wavelength is preferred for treating deeper leg veins due to its greater tissue penetration depth?