Discussion
The effects of diabetes on the respiratory functions were controversial.
Some studies showed that pulmonary functions were not affected in patients with diabetes [13], but some
authors suggested that predicted vital capacity, total lung
capacity, DLCO [14], and PImax [7] were lower in diabetic
patients. Spirometry parameters such as FVC% and FEV1%
were also found to be lower in patients with diabetes when
compared with non-diabetic patients [5,15].