Peculiarities of circulatory system response on influence of modern tantalum manufacture factors in workers.

Objective of this study was to examine functional condition of cardiovascular system among workers at "Ulba Metallurgical Plant" JSC (located in Ust-Kamenogorsk, Eastern Kazakhstan)--one of the world largest enterprises with the full production cycle from processing of tantalum containing raw materials to finished products. All workers that participated in the examination were divided into three groups: (I)--up to 5 years of occupation; (II)--from 5 to 9.9 years of occupation; and (III)--more than 10 years of occupation experience in the tantalum industry. The cardiovascular system, health concern and their contributing factors were assessed. In group I the factor of profitability of blood circulation was up to 3000 conventional units, which corresponds to the optimal fatigue; In group II the factor of profitability of blood circulation was increased up to 3525±327,3 conv. units--critical values zone. In group III the factor of profitability of blood circulation was up to 3000 conv. units. A relative improvement in the central hemodynamic indices compared with those in group II may be due to the development of adaptation. The assessments of functional condition of cardiovascular system among the workers specialize in different stages of tantalum production revealed the necessity of paying special attention at the cycle of tantalum processing and the years of work experience in an occupation.