SERUM NATRIURETIC PEPTIDE CONCENTRATION AND PARAMETERS OF CENTRAL HEMODYNAMICS IN FIREFIGHTERS AT THE BEGINNING AND AT THE END OF THE 24-HOURS SHIFT

Abstract

Aim: to study associations between concentration of N-terminal pro-brain natriuretic peptide (NT-proBNP) and indices of central hemodynamics in firefighters at the beginning and at the end of the 24-hours shirt. Methods: Altogether, 240 firefighters (aged 25-47 years) in the Tver region participated in the study. They were divided into three groups: 1-6, 7-15, 16-25 yearsof experience. Serum NT-proBNP level was measured using EIA assay. Several central hemodynamic parameters were assessed by tetrapolar thoracic rheography at the beginning and end of the 24-hours shift. Independent-samples ANOVA with Bonferroni post-hoc tests were applied for numeric variables. Before-after comparisons were performed using paired t-tests. Associations between the studied variables were assessed by Pearson's correlation coefficients. Results: The average concentration of NT-proBNP increased from 2.23 ± 0.11 at the beginning to 2.95 ± 0.10 f / mol / ml (p = 0.037) at the end of the shift in the first group. In the second and in the third groups an increase was from 4.11 ± 0.09 to 5.81 ± 0.18 f / mol / ml (p = 0.009) and from 3.41 ± 0.10 to 4.59 ± 0.17 f / mol / ml (p = 0.020). The correlation coefficients for the associations between NT-proBNP and volume of blood circulation changed from r = -0.46 (-0.65; -0.37) to r = 0.73 (0.69; 0.77), shock index from r = -0.42 (-0.62; -0.22) to r = 0.71 (0.65; 0.77) and cardiac index with r = -0.32 (-0.55; -0.19 ) to r = 0.82 (0.81; 0.83). Conclusion: NT-proBNP concentration in firefighters reflects the state of central hemodynamics and its change before and after extreme loads.