Cryosurgery Flashcards Preview

Derm 2020 > Cryosurgery > Flashcards

Flashcards in Cryosurgery Deck (34)
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1
Q

necrosis from cell injury occurs from the periphery of the area of freezing

A

F, centre

2
Q

tissue cells more resistant to destruction than cancer cells

A

F, other way around

3
Q

at periphery, some cells die whilst others remain alive. These have sustained sufficient injury to trigger apoptosis

A

T

4
Q

slow freeze with rapid thaw is the ideal formula for cell destruction

A

F, rapid freeze with slow thaw

5
Q

conductivity of the material interposed between lesion and cryogen will determine the final freezing temperature and the speed of attaining it

A

T

6
Q

air is a better conducting than ice

A

F, air

7
Q

2017 T/F - cones or plastic plates contain the sprayed liquid nitrogen within a defined area – semi open technique

A

T

8
Q

semi open technique is ideal for dome shaped lesions eg. warts, molluscum and small pyogenic granuloma

A

T

9
Q

closed technique uses probes to deliver liquid nitrogen from the unit via a conduit line

A

T, this maintains the LN in a closed system

10
Q

if probe from closed technique adheres to surface, abundant warm water facilitates detachment

A

T

11
Q

Closed technique as undesirable for vascular lesions

A

F, ideal for vascular lesions

12
Q

Semi-closed or chamber technique is not as potent as probe technique

A

F, as potent or more potent

13
Q

chamber technique reserved for benign lesions

A

F - limit to malignancies such as SCC and for palliative cryosurgery

14
Q

cryosurgery can be applied safely to patients with underlying medical conditions

A

T

15
Q

pain is more intense during freezing than thawing stage

A

F, other way around

16
Q

better to under treat with repeat treatment for benign lesions

A

T

17
Q

COTTON SWABS ARE HELPFUL IN CRYOSURGERY

A

F, SHOULD BE AVOIDED –> POOR THERMAL CAPACITY

18
Q

irregular surfaces are better treated with a spray

A

T

19
Q

probe better for irregular surfaces

A

F, use on flat or smooth surfaces

20
Q

presence of blood does not change temperature

A

F, incr local temperature

21
Q

cartilage and bone are very sensitive to freezing

A

F, very resistant

22
Q

LN2 poorly tolerated in genital and perianal areas

A

F, well tolerated

23
Q

open, semi open and closed techniques are used to treat molluscum contagiosum

A

T

24
Q

pigmented lesions very sensitive to freezing

A

T

25
Q

darker skin can hyper pigment even with superficial cryosurgery

A

T

26
Q

melasma can be treated with cryosurgery

A

F - p/157 states do not treat melasma with cryosurgery as there is a tendency for residual hyperpigmentaiton

27
Q

cryosurgery can be helpful for acne lesions

A

T

28
Q

cryosurgery can be helpful for scars

A

T

29
Q

cryosurgery can be helpful for rhinophyma

A

T

30
Q

LN2 should not be used for deep haemangiomas

A

T

31
Q

For Kaposi sarcoma, single freeze thaw cycle employed

A

F, DTFC

32
Q

only Moh’s has shown better results than cryosurgery for lentigo malignant

A

T

33
Q

oedema is more obvious in the face but can be overlooked in other parts of the body

A

T

34
Q

eschar formation is unexpected

A

F , expected p.164