Evaluation of relationships between indicators of the oxidative-antioxidative system and force of respiratory muscles in the case of community-acquired pneumonia

The objective: to evaluate relationships between the oxidative-antioxidative system (OAS) and the force indicators of respiratory muscles (RM) in patients with community-acquired pneumonia (CAP).

Subjects and methods. 78 men from 18 to 26 years old admitted to an in-patient unit with non-severe (NSCAP) and severe community-acquired pneumonia (SCAP) were examined. Force of expiratory (MEP, MRPD) and inspiratory (MIP, MRPD, SNIP) respiration muscles was registered by MicroRPM (CareFusion, UK). The state of OAS was assessed by the level of malondialdehyde (MDA), total antioxidative activity, superoxide dismutase (SOD), catalase, glutathione reductase (GR), glutathione peroxidase (GP), and reduced glutathione. Cluster and correlation analysis methods were used for data processing.

Results. CAP patients were divided into 3 clusters based on typical combinations of respiratory muscle force indicators and OAS. The first cluster included NSCAP, the second one included NSCAP and SCAP, and the third cluster included SCAP In patients of the 1st cluster, the dysfunction of expiratory respiration muscles prevailed, while in patients of the 2nd and 3rd cluster, it was inspiratory respiration muscle dysfunction. Significant negative correlations of MDA with MEP, MRPD during expiration, SNIP, and MIP were found, as well as positive correlations with GP, GR, catalase, and SOD. In convalescents of the 1st cluster, dysfunction of expiratory respiration muscles was improving, and in the 2nd and 3rd clusters, the dysfunction of expiratory and inspiratory respiration muscles was going down. In CAP patients, respiratory muscle dysfunction is associated with imbalanced OAS and the effect of these factors on respiratory muscle contractive activity.

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