The present investigation aimed at comparatively analyzing the dynamic science internationalization in hemorrhagic stroke prevention as reflected in four data-bases and at outlining the most significant primary information sources and scientists in this interdisciplinary field. In July 2015, a problem-oriented retrospective search of relevant publications primarily published between 1990 and 2014 and abstracted in Web of Science (WoS), Biosis and MEDLINE of Web of Knowledge as well as in Scopus was carried out. Several scientometric distributions were created to identify some essential peculiarities of the international scientific communications. There were 574 publications in 160 journals abstracted in Scopus, 408 papers in 191 journals abstracted in MEDLINE, 251 publications in 115 journals abstracted in WoS, and 114 publications in 69 journals abstracted in Biosis. In Scopus, WoS and Biosis, there were publications by authors from 60, 27 and 21 countries, respectively. USA authors dominated followed by those from Japan, Germany and Italy. Stroke, Journal of Neurosurgery, Neurosurgery and Acta Neurochirurgica belonged to ‘core’ journals. A. L. Kwan and N. F. Kassell presented with most publications. J. He’s et al. paper published in JAMA in 1998 already received 259 citations in WoS. H-index was relatively high - of 35 in WoS and of 27 in Biosis. There were considerable differences between these data-bases testifying to the necessity to make use of at least two secondary information sources for effective information retrieval. The files with researchers’ names, addresses and publications could be used by scientists from smaller countries for further improvement of their international collaboration.
 

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