How does rule of nines relate to burns?

The rule of nines is a method for estimating the total body surface area (BSA) affected by burns. It is based on dividing the body into 11 areas, each representing a multiple of 9%.

The rule of nines is as follows:

- Head and neck: 9%

- Anterior trunk: 18%

- Posterior trunk: 18%

- Right upper extremity: 9%

- Left upper extremity: 9%

- Right lower extremity: 18%

- Left lower extremity: 18%

- Perineum and genitalia: 1%

To use the rule of nines, the burned areas are estimated as a percentage of the total BSA. For example, a burn that covers the entire anterior trunk would be estimated to be 18% BSA. A burn that covers the entire right arm and hand would be estimated to be 18% BSA.

The rule of nines is a quick and easy way to estimate the BSA affected by burns. This information is important for determining the severity of the burn and the need for treatment.

In addition to the rule of nines, other methods for estimating BSA affected by burns include the Lund and Browder chart and the Berkow chart. These charts are more accurate than the rule of nines, but they are also more complex to use.