Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/90058
Title: The local repolarization heterogeneity in the murine pulmonary veins myocardium contributes to the spatial distribution of the adrenergically induced ectopic foci
Authors: Potekhina, V. M.
Averina, O. A.
Razumov, A. A.
Kuzmin, V. S.
Rozenshtraukh, L. V.
Issue Date: 2019
Publisher: Springer
Citation: The local repolarization heterogeneity in the murine pulmonary veins myocardium contributes to the spatial distribution of the adrenergically induced ectopic foci / V. M. Potekhina, O. A. Averina, A. A. Razumov, V. S. Kuzmin, et al. . — DOI 10.1007/s12576-019-00724-2 // Journal of Physiological Sciences. — 2019. — Vol. 6. — Iss. 69. — P. 1041-1055.
Abstract: An atrial tachyarrhythmias is predominantly triggered by a proarrhythmic activity originate from the pulmonary veins (PV) myocardial sleeves; sympathetic or adrenergic stimulation facilitates PV proarrhythmia. In the present study the electrophysiological inhomogeneity, spatiotemporal characteristics of the adrenergically induced ectopic firing and sympathetic nerves distribution have been investigated in a murine PV myocardium to clarify mechanisms of adrenergic PV ectopy. Electrically paced murine PV demonstrate atrial-like pattern of conduction and atrial-like action potentials (AP) with longest duration in the mouth of PV. The application of norepinephrine (NE), agonists of α- and β-adrenergic receptors (ARs) or intracardiac nerves stimulation induced spontaneous AP in a form of periodical bursts or continuous firing. NE- or ARs agonists-induced SAP originated from unifocal ectopic foci with predominant localization in the region surrounding PV mouth, but not in the distal portions of a murine PV myocardium. A higher level of catecholamine content and catecholamine fiber network density was revealed in the PV myocardial sleeves relative to LA appendage. However, no significant local variation of catecholamine content and fiber density was observed in the murine PV. In conclusion, PV mouth region appear to be a most susceptible to adrenergic proarrhythmia in mice. Intrinsic spatial heterogeneity of AP duration can be considered as a factor influencing localization of the ectopic foci in PV. © 2019, The Physiological Society of Japan and Springer Japan KK, part of Springer Nature.
Keywords: ACTION POTENTIAL
ARRHYTHMIA
ECTOPIC FOCI
ECTOPIC FOCUS
PULMONARY VEINS
NORADRENALIN
ACTION POTENTIAL
ANIMAL
BAGG ALBINO MOUSE
CARDIAC MUSCLE
DRUG EFFECT
ELECTROPHYSIOLOGY
INNERVATION
LUNG
MALE
MEMBRANE POTENTIAL
MOUSE
PHYSIOLOGY
PULMONARY VEIN
VASCULARIZATION
ACTION POTENTIALS
ANIMALS
ELECTROPHYSIOLOGICAL PHENOMENA
LUNG
MALE
MEMBRANE POTENTIALS
MICE
MICE, INBRED BALB C
MYOCARDIUM
NOREPINEPHRINE
PULMONARY VEINS
URI: http://hdl.handle.net/10995/90058
https://elar.urfu.ru/handle/10995/90058
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85074998049
WOS ID: 000496208500001
PURE ID: 11443413
ISSN: 1880-6546
DOI: 10.1007/s12576-019-00724-2
metadata.dc.description.sponsorship: 18-34-00931
The study is supported by RFBR 18-34-00931 grant. AP Action potentials AR Adrenergic receptors EAD Early afterdepolarization DAD Delayed afterdepolarization DD Diastolic depolarization SAP Spontaneous action potentials RMP Resting membrane potentials LA Left atria LAA Left atria appendage PKA Proteinkinase A PV Pulmonary veins PNS Postganglionic nerves stimulation NCX Natrium-sodium exchanger NE Norepinephrine PHE Phenylephrine ISO Isoproterenole
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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