Page 527 - First Aid for the USMLE Step 1 2020, Thirtieth edition [MedicalBooksVN.com]_Neat

Musculoskeletal, skin, and connective tissue ` dERmatology Musculoskeletal, skin, and connective tissue ` dERmatology section iii 483

Rule of 9’s The extent of a burn injury can be estimated as a percentage of the body surface area.

4.5 Entire head 4.5
9%
Entire torso
18%
9 9
Entire arm (L) 9%
4.5 4.5 Entire arm (R) 9% 4.5 4.5
Entire
9 9
abdomen
18%
1
Perineum
1%
9 9 9 9
Entire leg (L) 18%
Entire leg (R) 18%
Total 100%

Burn classification
dEpth inVolVEmEnt appEaRanCE sEnsation
Superficial burn Epidermis only Similar to sunburn; localized, painful, Painful
dry, blanching redness with no blisters
Superficial partial- All of epidermis and some dermis Blisters, blanches with pressure, Painful to temperature
thickness swollen, warm and air
Deep partial- All of epidermis and some dermis Blisters (easily unroofed), does not Painless; perception of
thickness burn blanch with pressure pressure only
Full-thickness burn All of skin (epidermis and dermis) White, waxy, dry, inelastic, leathery, Painless; perception of
does not blanch with pressure deep pressure only
Deeper injury burn All of skin and at least partial White, dry, inelastic, does not blanch Painless; some
involvement of muscle and/or with pressure perception of deep
fascia pressure

FAS1_2019_11-Musculo.indd 483 11/7/19 5:24 PM