Conal contribution to the electrocardiogram of chick embryo hearts

The Anatomical Record
G H PAFF, R J BOUCEK

Abstract

Contraction of the conus arterisus (conus) is visibly delayed in the tubular heart of the chick embryo, and since the electromechanical coupling interval of isolated conal segment is similar to other areas of the embryonic heart, the delayed contraction of the conus indicated an impedance in the spread of the depolarization wave across the ventriculo-conal (VC) junction. A surface electrode placed on the conus of hearts obtained from the 72-hour chick embryo records a deflection, termed the C wave, appearing between the QRS complex and the T wave. To establish that the C wave arose from below the atrioventricular sulcus, atria were removed from a series of hearts from 96-hour embryos and the electrogram revealed a C wave without a P wave. The VC junction responds to digitoxin just as the atrioventricular tissue. Digitoxin prolongs the interval between the QRS and the C wave prior to a complete block in a manner analogous to the PR interval increase prior to the development of the Wenckeback phenomenon or complete atrioventricular block. As the embryonic heart developed after 96 hours, the C wave was no longer identifiable in the ECG.

References

Oct 1, 1979·The American Journal of Anatomy·R P Thompson, T P Fitzharris
Apr 18, 2001·Biological & Pharmaceutical Bulletin·Yuji YoshiyamaKanji Tsuchimoto
Jun 17, 2003·Biological & Pharmaceutical Bulletin·Yuji YoshiyamaMotoko Kanke
Jan 8, 2004·Biological & Pharmaceutical Bulletin·Yuji YoshiyamaKanji Tsuchimoto
Feb 6, 2004·Biological & Pharmaceutical Bulletin·Yuji YoshiyamaMotoko Kanke
Oct 4, 2006·Journal of Cardiovascular Electrophysiology·Alexandre SarreE Raddatz
Nov 5, 2014·Acta Physiologica·D SedmeraE Raddatz
Aug 1, 1992·Circulation Research·F de JongAntoon F M Moorman
Apr 18, 1998·Circulation Research·Antoon F M MoormanW H Lamers
Nov 1, 1990·The Anatomical Record·W H LamersAntoon F M Moorman
Aug 5, 2005·Nihon yakurigaku zasshi. Folia pharmacologica Japonica·Yuji YoshiyamaTakashi Sugiyama
Sep 25, 2003·Physiological Reviews·Antoon F M Moorman, Vincent M Christoffels

Citations

Mar 1, 1970·Circulation Research·R J MyerburgB F Hoffman
Mar 1, 1968·The Anatomical Record·G H PAFFT C Harrell
Jan 1, 1968·Journal of Electrocardiology·A M Master, I Rosenfeld
Aug 1, 1967·Australian Journal of Biological Sciences·A K Tebĕcis
Sep 1, 1959·Circulation Research·R J BOUCEKG H PAFF
Jul 1, 1960·Circulation Research·A de CARVALHO, D de ALMEIDA
Jun 1, 1964·The Anatomical Record·G H PAFFH S KLOPFENSTEIN
Jul 1, 1965·Circulation Research·H IRISAWAA IRISAWA
Nov 1, 1965·The Journal of General Physiology·M Lieberman, A Paes de Carvalho
Nov 1, 1965·The Journal of General Physiology·M Lieberman, A Paes de Carvalho

Related Concepts

Embryo
Embryonic Heart
Heart Block
Electric Impedance
Right Coronary Sulcus
Contraction (Finding)
Gestational Age
Phylogeny
Atrioventricular Block
Digitoxin-Philo

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