Robinson Laser Chapters Flashcards Preview

Derm 2020 > Robinson Laser Chapters > Flashcards

Flashcards in Robinson Laser Chapters Deck (25)
Loading flashcards...
1
Q

Hair follicle is divided into two anatomic units - the infundibulum and isthmus

A

False -3 : infundibulum, isthmus and inferior segment .

2
Q

Infundibulum includes the region from the hair follicle orifice to the sebaceous duct entrance

A

True

3
Q

The isthmus includes the region between the entrance of the sebaceous duct and Ar rector pili muscle

A

True

4
Q

3 layers of the hair shaft are Henle, Huxley and cuticle

A

False. These are the layers of the inner root sheath

5
Q

Three layers of the 3 years of the inner root sheath are cuticle , cortex and medulla

A

False - these are the layers of the hair shaft itself

6
Q

Hair features such as the amount of pigment and hair shaft diameter increase from LANUGO to TERMINAL hairs

A

True

7
Q

Chemical depilatories contain thioglycolates that dissolve hairs by disrupting disulphides bonds

A

True

8
Q

Tweezing and waxing provide temporary hair loss for several months

A

False. - weeks

9
Q

Antiandrogenic medications including OCP and SPIRONOLACTONE have variable success in treating hirsutism

A

True

10
Q

Vaniqa is 20% eflornithine hydrochloride

A

False 13.9%

11
Q

Eflornithine inhibits ornithine decarboxylase reversibly

A

False - irreversible

12
Q

A hx of keloids or hypertrophic scar does not preclude laser hair removal

A

False

13
Q

If an active tan is present, or there is recent sun exposure -= laser treatment needs to be postponed for 2 weeks

A

False - six weeks

14
Q

Patients with numerous lentigines should be aware that laser hair removal might result in permanent removal of these freckles

A

True

15
Q

It is not necessary to damage stem cells in the bulge area at the interface of the outer roots health and connective tissue sheath

A

False - it is necessary

16
Q

Telogen hair bulbs are pigmented and good active targets for light absorption

A

False non pigmented - not active targets for light absorption

17
Q

Q=switched lasers produce instantaneous hair shaft vaporisation and a photo acoustic effect through delivering very short pulses

A

True

18
Q

Shorter pulse widths allow for higher tolerated fluences for all skin types

A

False - longer

19
Q

A smaller spot size <9mm allows for a greater likelihood photons can be scattered back into the incident collimated beam with result beam broadening

A

False, a larger >9mm spot

20
Q

Temporary hair removal is possible with all devices at any fluence

A

True

21
Q

A critical threshold fluence is not required to obtain long term hair removal

A

False

22
Q

Sublethal laser doses induce catagen and telogen

A

True , thus may be possible to synchronise follicular growth to some degree using lower fluences

23
Q

Once follicles are in early anagen, larger fluences with longer pulse durations can be used to destroy the follicle

A

True

24
Q

Pigment changes occur after hair removal include hyper but permanent hypopigmentation

A

False - can have temporary or permanent hypopigmentation also

25
Q

Leukotrichia can be temporary but not permanent after PIL and laser hair removal therapy

A

False can be permanent