The aim of the study was to determine if cardiovascular autonomic neuropathy (CAN) is associated with changed concentration of exhaled carbon monoxide (eCO) in adolescents with type 1 diabetes (T1D). A total of 46 T1D patients and 25 healthy controls (15-19 years) were enrolled. The parameters eCO and carboxyhemoglobin (HbCO) were established using a MICRO-4 Smokerlyser. CAN was examined by standard cardiovascular tests. Adolescents with T1D did not significantly differ in eCO compared to healthy subjects. eCO and HbCO were significantly lower in CAN-positive subjects (n=19) (1.36 ± 1.65 ppm vs. 3.09 ± 2.31, p=0.01 and 0.58 ± 0.49% vs. 1.04 ± 0.44, p<0.01, respectively) compared to CAN-negative subjects (n=27), whereas no significant difference was found in other measured parameters. By multivariate logistic regression, eCO and HbCO were associated with higher risk of CAN (OR=1.824, p<0.05 and OR=10.989, p<0.01). Our results indicate that eCO is decreased in CAN-positive diabetic subjects. Further studies are necessary to investigate the possible role of eCO as a marker for CAN.
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