Kazan medical journalKazan medical journal0368-48142587-9359Eco-Vector8077010.17816/kazmj80770Research ArticleTachy-arrhythmia and tachycardia A. Dumas and Austett (Rg. Med. No. 39, 1932)KramovN.info@eco-vector.com151219323210-129839832109202121092021Copyright © 2021, Eco-Vector2021Kazan Medical archiveКазанский медицинский архив