Robinson Laser Chapters

Question 1

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

Answer 1

False -3 : infundibulum, isthmus and inferior segment .

Question 2

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

Answer 2

True

Question 3

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

Answer 3

True

Question 4

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

Answer 4

False. These are the layers of the inner root sheath

Question 5

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

Answer 5

False - these are the layers of the hair shaft itself

Question 6

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

Answer 6

True

Question 7

Chemical depilatories contain thioglycolates that dissolve hairs by disrupting disulphides bonds

Answer 7

True

Question 8

Tweezing and waxing provide temporary hair loss for several months

Answer 8

False. - weeks

Question 9

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

Answer 9

True

Question 10

Vaniqa is 20% eflornithine hydrochloride

Answer 10

False 13.9%

Question 11

Eflornithine inhibits ornithine decarboxylase reversibly

Answer 11

False - irreversible

Question 12

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

Answer 12

False

Question 13

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

Answer 13

False - six weeks

Question 14

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

Answer 14

True

Question 15

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

Answer 15

False - it is necessary

Question 16

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

Answer 16

False non pigmented - not active targets for light absorption

Question 17

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

Answer 17

True

Question 18

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

Answer 18

False - longer

Question 19

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

Answer 19

False, a larger >9mm spot

Question 20

Temporary hair removal is possible with all devices at any fluence

Answer 20

True

Question 21

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

Answer 21

False

Question 22

Sublethal laser doses induce catagen and telogen

Answer 22

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

Question 23

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

Answer 23

True

Question 24

Pigment changes occur after hair removal include hyper but permanent hypopigmentation

Answer 24

False - can have temporary or permanent hypopigmentation also

Question 25

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

Answer 25

False can be permanent