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Derm Surg questions > Lasers > Flashcards

Lasers Flashcards

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Dermatology Board Prep flashcards
1
Q

What laser wavelength is best for treating scar erythema?

A

595 PDL laser (Pulse Dye Laser)

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2
Q

what is the penetration of a CO2 laser

A

1mm

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3
Q

ErYag laser is what wavelength?

A

2940 (infrared light frequency)

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4
Q

name three properties of laser electromagnetic radiation.

A
  1. monochromaticity - all the same wavelength
  2. coherence - the wavelengths travel in phase
  3. collimation - the wavelengths travel in parallel
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5
Q

how is a photon made?

A

energy pump excites the laser media exciting electrons when electrons drop back to their normal energy level they release a photon.

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6
Q

at what wavelength does uvb become uva

A

315

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7
Q

What wavelength does uvb start and below becomes UVC

A

280

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8
Q

In what phase is it easier to do laser hair removal anagen catagen or telogen

A

anagen more melanosomes during growth phase.

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9
Q

what wavelength does melanin absorb light

A

600-1200nm

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10
Q

What does the acroynm LASER stand for?

A

Light Amplification by Stimulated Emission of Radiation

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11
Q

What are photons

A

electromagnetic radiation

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12
Q

What type of dye is used in Pulse Dye Lasers

A

Rhodamine dye (liquid laser Media)

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13
Q

If the laser medium is a semiconductor what type of laser is it?

A

Diode

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14
Q

what is the wavelength of the CO2 laser

A

10600nm

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15
Q

what wavelength does the diode laser fall in

A

800nm infrared

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16
Q

why does penetration decrease at 1300nm if the longer wavelengths penetrate deeper

A

Because at 1300nm and above water is a target and the photons get absorbed so there is less penetration.

17
Q

what is the wavelength for the alexandrite laser

A

755

18
Q

what is the wave length for the Ruby laser

A

694

19
Q

whats the wavelenght for KTP laser

A

532

20
Q

What’s the wavelenght for PDL

A

585-600

21
Q

calculate the Thermal reaction time of a chromophore .1 microns

chromophore .5 microns

A

Thermal Reaction time is = chromophore diameter squared

10 nanoseconds

250 nanoseconds

22
Q

When do you see suture granulomas (time frame) and what suture material is most associated with them?

A

1-3 months

Vicryl (polyglcan 910)

23
Q

what is the doseage interval for post op pain management for skin surgery and dose amounts first line therapy

A

Tylenol one gram q8 hours with Ibuprofen q4 hours

24
Q

What is the most effective wave lenght for sunburn

A

300nm

25
Q

what is the genetic DNA damage by UVB

A

Cyclobutane-pyrimidine dimers which thymine-thymine dimers are most common.

26
Q

imediate pigment darkening and persistant darking from UV is due to what?

A

Photo oxidation of melain

Derm Surg questions (26 decks)

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