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Flashcards in Derm Deck (76):
1

what is the most common subcutaneous neoplasm

lipoma

2

what is the most common tumor diagnosed in the US?

Basal cell carcinoma

3

biggest risk factor for BCC

UV exposure, during adolescence

4

Most common form of BCC

nodular form. pearly nodules with rolled edges. Rodent ulcer.

5

Treatment options for BCC

Moh's surgery, Excisional surgery, Cautery and destruction or radiation

6

The definitive treatment for non-morpheform BCC lesions

Excision surgery with 4 mm margins and extension into subcutaneous tissue

7

treatment of choice for morpheaform, recurrent and infiltrative BCC

Mohs surgery

8

cautery and destruction for BCC

should never be for facial lesions and should only be used for patients that are somehow not candidates for excision or mohs

9

SCC that tend to be slower growing

develop from actinic keratosis

10

SCC that tend to be more aggressive

develop from Bowen disease, erythroplasia of Queyrat, chronic radiation dermatitis, scars and chronic ulcers. Also lesions that develop from normal appearing skin of the lips, genital and anal area.

11

SNLB

Sentinel lymph node biopsy- maps the first node basin that any disease would travel to if it were metastatic. Used for high risk SCC > 2mm or for MM > 1 cm Palpable lymph node is a contraindication for SNLB.

12

High risk tumors

> 2cm in diameter and/or involvement into the subcutateous tissue

13

Indications for Moh's surgery

nail bed lesions, verrucous carcinomas, invasive lesions, poorly differentiated times and at sites where cosmesis is critical

14

increases risk of developing Malignant melanoma x2

10+ tanning bed sessions as an adolescent/young adult

15

most common subtype of Malignant Melanoma

Superficial Spreading (70%). Not found on the hands or feet

16

Skin lesion diameter that is concerning

> 6 mm

17

margin size for MM tumors

1 cm

18

margin size for MM tumors 1-2 mm

1-2 cm

19

margin size for MM tumors 2-4 mm

2 cm

20

margin size for MM tumors > 4mm

2 cm

21

margin size for MM in-situ tumor

0.5 cm

22

Factors affecting the severity of a burn

The degree of heath, length of time in contact with her, and what part of skin is affected

23

1st degree burn

partial thickness, epidermis only. Is dry, red and Painful.

24

treatment for a 1st degree burn

cool moist gauze, fans, and OTC topicals

25

2nd degree burn

partial thickness burn that causes the epidermis to separate. These are red, wet and very painful.

26

3rd degree burn

full thickness burn into the corium and fat layers. These are leathery, dry and insensate. Granulation occurs and skin is friable. Will contract and be hypertrophic

27

admission criteria for a burn

airway compromise, need fluid resuscitation, > 10-15% TBSA, unable to take PO, burn to face, ears, hands, genitals, feet, suspected abuse, skin grafting indicated

28

Burn unit transfer criteria

2nd or 3rd degree burns that are > 10%TBSA in pts 10-50 yo, or burns that are >20%TBSA in other age groups. Burns that involve the face, hands, feet, genitals, perineum or major joints. any 3rd degree burn > 5%TBSA. Electrical and chemical burns apply and any case that involves an inhalation injury.

29

Parkland formula

Fluid replacement formula for burn patients. mL of LR to give = 4mL x kg body weight x % burn. This is in addition to maintenance fluids. The first 1/2 of estimated volume to supplement is given in 1st 8 hrs, and the remainder is spread out over 16 hours.

30

Silver sulfadiazine

broad spectrum gr+ and - coverage for burn wounds that is only moderately affective in penetrating an eschar. Application is typically painless. When used over large burns pts may develop transient leukopenia- usually self limiting.

31

Aqueous silver nitrate 0.5%

Topical medication for burns, has broad spectrum coverage including fungal coverage but is prone to leaching electrolytes

32

Mafenide acetate

topical medication for burns that has broad spectrum coverage and is best for penetrating burn eschar

33

Circumferential and 3rd degree burns pose specific risk of

compromising circulation and complicating breathing because of contractors that form

34

Escharotomy

cutting and releasing the tension of the scar eschar. Old way to do it on the trunk was the checkerboard pattern. Now we do make long axillary lines down to subcostal margin and then connect along the bottom of the abdomen. Bivalve cuts medially and laterally is indicated for limb escharotomy

35

Risks associated with electrical burns > 500 volts

Compartment syndrome, cardiac arrhythmia, myoglobinuria

36

Suspect inhalation injury if

burn exposure was in a small enclosed space, facial burns, singed nasal hairs, carbon debris in mouth, pharynx or sputum

37

porcine xenograft

adheres to the would coagulum and provides good pain control

38

Split thickness allograft

vascularizes and proves durable temporary closure of wounds

39

hydrocolloid dressings

provide vapor and bacteria barrier and absorbs wound exudate

40

impregnated gauzes

provide vapor and bacteria barrier and allow drainage

41

AlloDerm R semipermeable membrane

cell-free, allogenic human dermis. Requires immediate thin overlying autograft

42

IntegraR semipermeable membrane

Is a scaffold for neodermis- requires a delayed thin autograft

43

Taking a skin graft

Take skin along the dermatome, make sure it is thin enough so that the donor site is able to heal, and make sure the bleeding points are close together to ensure adequate blood supply.

44

Can uses a skin graft if

the wound has adequate vascular supply, there is no infection, and hemostasis is assured. Points like color matching, contour, durability, and donor morbidity need to also be considered.

45

Common sites for graft harvesting

anterior thigh and buttocks

46

Full thickness graft

Takes full layer of epidermis and dermis. Goes down to the subq.

47

Thick split-thickness graft

Takes full epidermis + 2/3 of the dermis

48

Intermediate Split-thickness graft

Takes full epidermis + 1/3 of the dermis

49

Thin split-thickness graft

takes epidermis only

50

most widely used method for obtaining skin graft

Electric or air powered dermatomes- because of their reliability and ease of operation

51

To ensure survival of the graft

make sure there is adequate vascularity of the recipient bed, make sure there is complete contact between the graft and the bed, and make sure the graft-bed unit is immobilized and that it is relatively abacterial

52

care of a meshed skin graft

should be covered for 24-48 hrs. often covered with Xeroform gauze, but can also use a wound vac or bolster dressing. Dressings can be left on for 5-7 days if the grafted wound was free from infection

53

Advantages of a split thickness skin graft

contract less, more resistant to surface trauma, more similar to normal skin compared to thinner grafts. Aesthetically marginally acceptable

54

Disadvantages of split-thickness skin graft

have a higher fail rate of taking to the recipient site, donor sites are slower to heal compared to thinner grafts, and donor sites heal with more scarring compared to thinner grafts

55

advantages of meshed split thickness skin graft

can be placed in an irregular and even contaminated wound bed, fewer hemostasis complications, can get more coverage from less skin

56

disadvantages of meshed split thickness skin graft

poor cosmesis- alligator hide look

57

advantages of full thickness skin grafts

these are the most aesthetically desirable for the recipient because they have the least amount of contracture and have the greatest ability to withstand trauma.

58

disadvantages of full thickness skin grafts

the size and number of available donor sites is limited. the donor site has to heal by primary intention and will have a scar. Also, conditions at the recipient site must be optimal for a successful transplant

59

Best donor sites for full thickness skin grafts

eyelid skin, post-auricular, supraclavicular, antecubital, inguinal and genital areas. Areas of thin skin are best.

60

indications for using Integra biologic skin substitute

area over a tendon, where simple skin graft alone would not suffice

61

random pattern skin flap

consists of skin and subq tissue and has peripheral artery blood supply, but in no particular relation or orientation. This is the least reliable type of flap but is commonly used. Can rotate these flaps. The ratio of length to width cannot exceed 1.5 : 1 (unless the flap is cut from the face or scalp).

62

axial pattern skin flap

these flaps have very well defined blood supply running along the long axis of the flap- can be very long and skinny. Most common axial flaps are deltopectoral and forehead flaps

63

muscle and musculocutaneous flaps

consist of skin and underlying muscle- these flaps have revolutionized reconstructive surgery. skin over major parts of muscles are supplied by one primary axial vessel- this entire area can be circumscribed and relocated to an area in need. These flaps are best for wound areas caused by radiation, osteomyelitis or areas at high risk of infection.

64

latissimus dorsi muscle flap

supplied by thoracodorsal vessels and often used in mastectomy reconstruction

65

pectorals major muscle flap

used to cover defects in the sternum, neck and lower face. Supplied by subclavian artery and internal mammary artery.

66

tensor fasciae latae muscle flap

can be used to reconstruct the lower abdominal wall, to cover defects from ulcers of the pubis and groin, and is the method of choice for covering greater trochanteric pressure ulcers. supplied by lateral femoral circumflex a.

67

rectus femoris muscle flap

used for reconstruction of lower abdominal wall and for ulcers in the pubis and groin. has a shorter arc of rotation but is more robust of a flap compared to the tensor face latae. Supplied by the profunda femoris a and superficial femoral aa.

68

rectus abdomens myocutaneous flap

TRAM flaps are the workhorse for autologous tissue breast reconstruction. Supplied by epigastric arcade composed of deep superior and inferior epigastric aa

69

trapezius muscle flap

covers defects in the neck, face and scalp. supplied by transverse cervical aa

70

temporalis muscle flap

commonly used to cover orbital defects, supplied by temporal aa

71

Gluteus maximus muscle flap

used to cover pressure sores, supplied by superior and inferior gluteal aa

72

Gracilis muscle flap

supplied by metal femoral circumflex aa, and can be used for ischial pressure sores and vaginal reconstruction

73

gastrocnemius muscle flaps

used to cover the knee an anterior tibia, and is supplied by sural aa

74

free skin flaps

microvascular surgery is used to remove a flap of skin and reconnect its blood supply with the recipient blood supply.

75

DIEP flap

Deep inferior epigastric perforator flap- a free flap that is commonly used in breast reconstruction

76

perforator skin flap

takes a flap of skin that is supplied by a major vascular pedicle, the idea being that this will arborize at the new site. There is decreased donor site morbidity here.