Dysfunction of respiratory system in patients with diabetes mellitus and coronary artery disease

Abstract

Aims: we aimed to estimate the main parameters characterizing respiratory pulmonary function in patients with isolated type 2 diabetes mellitus (T2DM) and coronary artery disease (CAD), as well as with their combination.
 Materials and methods: the study included 198 patients divided into 3 groups: I with isolated CAD [94 (47.5%)], II with T2DM without the signs of CAD [64 (32.3%)], III with combined CAD and T2DM [40 (20.2%)]. The assessment of carbohydrate and lipid metabolism, as well as the measurement of inflammatory markers were performed using unified clinical and biochemical methods. Respiratory pulmonary function and diffusion lung capacity (Dlco) were assessed using Elite Dl-220v body plethysmograph.
 Results: the parameters reflecting the respiratory pulmonary function and the level of gas diffusion through alveolar-capillary membrane (ACM) in patients with CAD both with and without diabetes was within the normal values. The exception was the level of residual volume, which was below the prognostic values in all the studied groups. At the same time, in diabetic patients with CAD the values of forced and slow vital lung capacity, forced expiratory volume for 1-second, as well as the level of diffusion were significantly lower as compared to the corresponding values in patients with isolated CAD and didnt differ in comparison with the values of diabetic patients except for the level of diffusion. It should be noted that a number of respiratory parameters had a correlation relationships with glycemic level, inflammatory markers and with the indicators characterizing dyslipidemia and myocardial dysfunction.
 Conclusions: in the course of the study it was found out that the diabetic patients had respiratory system dysfunction in comparison to the patients with isolated CAD. The presence of diabetes in patients with CAD worsens not only the somatic background but probably contributes to the respiratory dysfunction in the form of lower velocity and volumetric parameters, but also in the indicator showing respiratory metabolism.