Zefirov TL, Khabibrakhmanov II, Ziyatdinova NI, Zefirov AL. Peculiar Aspects in Influence of α
1-Adrenoceptor Stimulation on Isolated Rat Heart.
Bull Exp Biol Med 2016;
162:4-6. [PMID:
27878488 DOI:
10.1007/s10517-016-3530-z]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Indexed: 11/26/2022]
Abstract
The study examined the effect of α1-adrenoceptor stimulation with methoxamine on chronotropic function of isolated heart perfused ex vivo according to Langendorff and cardiac chronotropy in vivo. Stimulation of α1-adrenoceptors in isolated heart induced gradually developing bradycardia, which progressed during several minutes. Similar stimulation in vivo produced a short-term bradycardia probably terminated by the compensatory influences in the whole organism. Comparison of the data obtained in both experimental paradigms during α1-adrenoceptor stimulation revealed unidirectional changes in cardiac chronotropy characterized with time-related peculiarities.
Collapse