Effect of atrial artificial electrical stimulation on depolarization and repolarization and hemodynamics of the heart ventricle in rainbow trout Oncorhynchus mykiss.
Activation-recovery interval
Atrial pacing
Fish
Heart
Oncorhynchus mykiss
Pumping function
Rainbow trout
Ventricle
Journal
Fish physiology and biochemistry
ISSN: 1573-5168
Titre abrégé: Fish Physiol Biochem
Pays: Netherlands
ID NLM: 100955049
Informations de publication
Date de publication:
Aug 2021
Aug 2021
Historique:
received:
06
01
2021
accepted:
25
06
2021
pubmed:
10
7
2021
medline:
26
8
2021
entrez:
9
7
2021
Statut:
ppublish
Résumé
The spatial-temporal organization of the activation, repolarization and hemodynamics of the heart ventricle in rainbow trout, Oncorhynchus mykiss, adapted to a temperature of 5-7 °C, were studied from the normal sinus rhythm (21.6 ± 4.9 bpm) to the highest possible heart rhythm (HR) (60 bpm), during which deterioration of the contractile activity of the myocardium occurred. Regardless of the HR, the main pattern of excitation of the heart ventricle was the movement of the depolarization wave from the dorsal areas of the base in the base-apical and ventral directions with the capture of the entire thickness of the walls, with a slight difference in the time of activation of the subendocardium compared to the subepicardium. The increase in HR above the sinus rhythm caused significant shortening of local repolarization durations in all areas and layers (endocardial, intramural and subepicardial) of the heart ventricle. Changes in local durations of repolarization led to an increase in the heterogeneity of repolarization of the ventricular myocardium; as a result, a deterioration of its contractility was observed. In relation to the sinus rhythm, the maximal systolic pressure in the heart ventricle decreased, the diastolic and end-diastolic pressure increased, and the maximum rates of pressure rise and fall decreased. In rainbow trout adapted to a temperature of 5-7 °C at sinus rhythm, the pumping function of the heart was probably within the upper limit of the physiological norm, and a further increase in the heart rate led to a decline in myocardial contractility.
Identifiants
pubmed: 34241764
doi: 10.1007/s10695-021-00983-0
pii: 10.1007/s10695-021-00983-0
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1329-1339Informations de copyright
© 2021. The Author(s), under exclusive licence to Springer Nature B.V.
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