| Myocardial contractility in chickens (Gallus gallus): analysis of systolic time intervals. | |
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MedLine Citation:
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PMID: 16431146 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The avian cardiovascular system is of special interest because avian hearts are relatively larger than mammalian hearts, and activation of ventricular myocardium in birds has a "flash" pattern. Systolic time intervals and indices of myocardial contractility were examined in anaesthetized open-chest chickens by polycardiography, including synchronous recordings of electrocardiogram, phonocardiogram, and apex cardiogram. The asynchronous contraction time, isometric contraction time, pre-ejection period and ejection time were 26 +/- 3 (Mean +/- SD), 21 +/- 9, 47 +/- 12, and 83 +/- 23 ms, respectively, for heart rates of 260 +/- 57 bpm. The myocardial tension index, isometric contraction index and the pre-ejection period/ejection time ratio were 0.39 +/- 0.11, 0.42 +/- 0.10, and 0.54 +/- 0.14, respectively. A "flash" pattern of ventricular myocardial depolarization causes more rapid excitation and as a consequence shorter asynchronous contraction time of relatively larger chicken hearts compared with rabbit hearts. Inverse relation (P < 0.05) of the asynchronous contraction time to the heart rate in chickens is probably associated with the specific activation pattern of avian ventricles. Establishment of the values of systolic time intervals will facilitate a better understanding of cardiac function in birds. The obtained results are discussed in comparison with the rabbit. The indices calculated from the systolic time intervals show disadvantageous contractile function of chicken heart compared to rabbit heart. |
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Authors:
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Sergey N Kharin; Dmitry N Shmakov |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2006-01-20 |
Journal Detail:
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Title: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology Volume: 143 ISSN: 1095-6433 ISO Abbreviation: Comp. Biochem. Physiol., Part A Mol. Integr. Physiol. Publication Date: 2006 Mar |
Date Detail:
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Created Date: 2006-02-28 Completed Date: 2006-05-04 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9806096 Medline TA: Comp Biochem Physiol A Mol Integr Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 326-31 Citation Subset: IM |
Affiliation:
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Laboratory of Cardiac Physiology, Institute of Physiology of the Komi Science Center, the Ural Branch of the Russian Academy of Sciences, 50 Pervomayskaya st., Syktyvkar, 167000, Komi Republic, Russian Federation. s.kharin@physiol.komisc.ru |
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Chickens / physiology* Electrocardiography Female Myocardial Contraction / physiology* Systole / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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