Key result
Aging prolongs QRS duration by ~69% in rat hearts, suggesting impaired impulse propagation.
Why the study?
Does aging impair ventricular activation and alter myocardial structure in rats?
Population
11 rats (4 control and 7 aged rats)
Comparison
Aging (aged rats) vs Control rats
Design
Preclinical
Authors
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May create arrhythmogenic substrate in aged rats; leaves open relevance to human age-related arrhythmias.
Does aging impair ventricular activation and alter myocardial structure in rats?
Effect estimate: QRS duration: +69%
Aging in rats leads to delayed ventricular activation and abnormal activation patterns due to impaired impulse propagation through the conduction system, potentially creating an arrhythmogenic substrate.
Rossi et al. (2008) studied Aging (n=11). Aging vs. Control rats was evaluated on Total ventricular activation time (QRS duration: +69%). Aged rat hearts exhibited a significantly delayed total ventricular activation time (QRS duration +69%) compared with control hearts, suggesting impaired impulse propagation.
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