From the respiratory point of view, there is increased oxygen consumption, restrictive pulmonary dysfunction, decreased inspiratory capacity, decreased vital capacity and particularly, reduced functional residual capacity.
De acuerdo al índice de masa corporal IMC podemos clasificar a los pacientes en obesidad leve IMC 27-29,9, moderada IMC 30-34,9, severa IMC 35-39,9, mórbida IMC 40-49,9, superobesidad IMC 50-59,9 y súper-superobesidad IMC>60.