ABCS Non-Surgical Cosmetic Procedures and Aesthetic Medicine 3 ā Questions and Answers
Question 1: Which chromophore is primarily targeted by the 1064 nm Nd:YAG laser?
- Oxyhemoglobin
- Melanin (Correct answer)
- Water
- Tattoo ink only
Correct answer: Melanin
At 1064 nm, melanin is the predominant chromophore, though this wavelength has relatively low melanin absorption, making it safer for darker skin tones than shorter wavelengths.
Question 2: Cryolipolysis (CoolSculpting) induces fat reduction primarily through which mechanism?
- Necrosis of adipocytes from ice crystal formation
- Apoptosis triggered by controlled cooling without freezing tissue (Correct answer)
- Lipolysis via beta-adrenergic stimulation from cold exposure
- Fibrosis compressing adipose lobules
Correct answer: Apoptosis triggered by controlled cooling without freezing tissue
Cryolipolysis selectively triggers apoptosis in adipocytes at temperatures above freezing (around 4Ā°C), exploiting fat cells' heightened sensitivity to cold compared to surrounding tissues.
Question 3: Which of the following best describes the zone of coagulation in a fractional ablative laser treatment?
- Entire epidermis removed with no untreated islands
- Columns of ablated tissue surrounded by intact skin bridges (Correct answer)
- Superficial dermis heated below coagulation threshold
- Subcutaneous fat selectively heated via conduction
Correct answer: Columns of ablated tissue surrounded by intact skin bridges
Fractional ablative lasers create microscopic treatment zones (MTZs)ācolumns of ablated/coagulated tissueāsurrounded by untreated skin that accelerates healing and reduces downtime.
Question 4: A patient on warfarin therapy is requesting a chemical peel. At which peel depth does bleeding risk become clinically significant?
- Very superficial (stratum corneum only)
- Superficial (into epidermis)
- Medium depth (papillary dermis)
- Deep (reticular dermis) (Correct answer)
Correct answer: Deep (reticular dermis)
Deep chemical peels penetrating the reticular dermis carry meaningful bleeding risk and require coagulation status assessment; superficial and medium peels generally do not induce significant bleeding.
Question 5: Which muscle is responsible for the 'bunny lines' that appear on the nose with facial expression?
- Procerus
- Nasalis (Correct answer)
- Levator labii superioris alaeque nasi
- Depressor septi nasi
Correct answer: Nasalis
The nasalis muscle (transverse portion) contracts to produce diagonal wrinkles on the dorsal nose known as bunny lines, which are treated with small doses of botulinum toxin.
Question 6: What is the mechanism by which intense pulsed light (IPL) treats facial telangiectasias?
- Photodynamic activation of porphyrins in vessel walls
- Selective photothermolysis targeting oxyhemoglobin in vessels (Correct answer)
- Collagen contracture compressing vessel lumens
- Non-selective thermal destruction of superficial vasculature
Correct answer: Selective photothermolysis targeting oxyhemoglobin in vessels
IPL uses broad-spectrum light filtered to target oxyhemoglobin (peak absorption ~541 and 577 nm), causing selective thermal damage to the vessel wall through selective photothermolysis.
Question 7: Which adverse effect is most commonly associated with high-frequency focused ultrasound (HIFU) treatments for skin tightening?
- Post-inflammatory hyperpigmentation
- Permanent nerve palsy
- Transient erythema and mild edema (Correct answer)
- Superficial burns requiring wound care
Correct answer: Transient erythema and mild edema
Transient erythema, mild edema, and tenderness are the most common side effects of HIFU, typically resolving within hours to a few days after treatment.
ABCS Non-Surgical Cosmetic Procedures and Aesthetic Medicine 3
Which chromophore is primarily targeted by the 1064 nm Nd:YAG laser?