Ricardo Castrellon, Medical Director of the Burn Center at South Miami Hospital, explains the Rule of 9's is about how badly burn you are and it refers to the surface area of your body and this will determine the treatment.
"In your upper extremities, if you have a circumferential burn of your arm, that refers to 9%, so 4.5% for the anterior surface and another 4.5% for the posterior surface, your torso will be 9 and the upper portion nine," he says when explaining how with the palm you can have the percentage of your body is burnt.
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