Key result
QRS wave form shifts across 20 vertebrate species mirror developmental changes seen in chick and rat embryos.
Why the study?
The activation process in the ventricles as indicated by QRS complex wave forms has not been comparatively studied across multiple vertebrate species from an electrocardiographical perspective.
Observational
Answers are grounded in this paper and cite their sources.
Aligns phylogenetic QRS transitions with ontogenic patterns across vertebrates; extends evolutionary insights into ventricular activation but leaves clinical translation open.
Bipolar electrocardiograms along the longitudinal heart axis (A-B lead) were recorded on twenty species of vertebrates. The wave forms of the QRS complex indicating the activation process in the ventricles were compared among these species from a comparative electrocardiographical point of view. They were arranged phylogenically in the order of Rs→RS→rS or Rs (qRs) types. The shifting process in the wave forms of the QRS complex was the same as that observed ontogenically in the chick embryo and the rat foetus.
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SAWAZAKI et al. (1976) reported an observational. Phylogenic species variation vs. Various vertebrate species was evaluated on Wave forms of the QRS complex. Phylogenic variation across 20 vertebrate species shifted QRS complex wave forms in the order of Rs→RS→rS or Rs types, matching ontogenic observations in chick embryos and rat fetuses.
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