Changes in heart rate during electrical stimulation of the atrium in rainbow trout (Oncorhynchus mykiss) at low temperature

Authors

  • Natalya Kibler Laboratory of Cardiac Physiology, Institute of Physiology, Komi Science Center of the Ural Branch of the Russian Academy of Sciences, ul. Pervomayskaya, 50, Syktyvkar, 167982, Russian Federation; Syktyvkar Humanitarian Pedagogical Colledge, Oktyabrskiy pr., 24, Syktyvkar, 167001, Russian Federation https://orcid.org/0000-0002-9775-7717
  • Vladimir Nuzhny Laboratory of Cardiac Physiology, Institute of Physiology, Komi Science Center of the Ural Branch of the Russian Academy of Sciences, ul. Pervomayskaya, 50, Syktyvkar, 167982, Russian Federation https://orcid.org/0000-0002-5573-5499
  • Dmitry Shmakov Laboratory of Cardiac Physiology, Institute of Physiology, Komi Science Center of the Ural Branch of the Russian Academy of Sciences, ul. Pervomayskaya, 50, Syktyvkar, 167982, Russian Federation https://orcid.org/0000-0001-7799-9236

DOI:

https://doi.org/10.21638/spbu03.2022.204

Abstract

In this work, we investigated the effect of high heart rate (HR) in vivo on the electrical properties and pumping functions of the heart ventricle of the rainbow trout (Oncorhynchus mykiss) at low ambient temperatures. HR was altered by atrial pacing. The electrocardiogram (ECG) parameters and hemodynamic parameters of the heart ventricle of rainbow trout adapted to a temperature of 5–7 °C were studied from the normal sinus rhythm (21.6 ± 4.9 bpm) to the maximum possible HR. Results show that a HR of about 60 bpm is the upper limit of the normal functional activity of the ventricle of the heart. An increase in heart rate up to 60 bpm leads to an increase in the PQ interval and QRS complex, a decrease in the QT interval on the ECG, and a violation of the rhythmic activity of the heart (i.e., the occurrence of extrasystole), as well as to a considerable change in the hemodynamic parameters of the ventricle of the heart and a decrease in its contractile properties. After a period of ventricular extrasystole for several minutes (10–15 min), the activity of the sinus node resumes but with a lower HR compared with the initial HR. The duration of the QRS complex recovers to the initial one, and the PQ and QT intervals increase. Maximum systolic pressure and end-diastolic pressure also return to their original values after extrasystolic contraction. After the experimental extrasystole, the phenomenon of the absence of an increase in HR is observed. The arising extrasystole probably has a functional nature and is one of the mechanisms of electromechanical homeostatic control in the heart.

Keywords:

heart rate, electrocardiogram, hemodynamics, heart ventricle, temperature, rainbow trout

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References

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Published

2022-06-24

How to Cite

Kibler, N., Nuzhny, V., & Shmakov, D. (2022). Changes in heart rate during electrical stimulation of the atrium in rainbow trout (<em>Oncorhynchus mykiss</em>) at low temperature. Biological Communications, 67(2), 113–119. https://doi.org/10.21638/spbu03.2022.204

Issue

Vol. 67 No. 2 (2022)

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Full communications

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Articles of Biological Communications are open access distributed under the terms of the License Agreement with Saint Petersburg State University, which permits to the authors unrestricted distribution and self-archiving free of charge.