Key result
Subcutaneous isoproterenol elicits VF in ~80% of older rats compared to younger cohorts.
Why the study?
Does age affect the incidence of isoproterenol-induced ventricular fibrillation in rats?
Population
Rats of different ages (1 month, 2 months, 10-12 months, and 19-21 months)
Comparison
Isoproterenol administration vs Comparison across different age groups
Design
Preclinical
Authors
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Aging heightens isoproterenol-induced VF susceptibility in rats; leaves open translation to human age-related arrhythmia risk.
Does age affect the incidence of isoproterenol-induced ventricular fibrillation in rats?
Absolute Event Rate: 80% vs 0%
Aging increases the susceptibility of rats to isoproterenol-induced ventricular fibrillation, a phenomenon that appears unrelated to age-dependent changes in cardiac beta-receptor sensitivity.
Guideri et al. (1987) studied Isoproterenol-induced ventricular fibrillation. Isoproterenol vs. Different age groups (1-month and 2-month old rats) was evaluated on Ventricular fibrillation. Subcutaneous injection of isoproterenol elicited ventricular fibrillation in approximately 80% of rats at 10-12 months of age, compared to 0% in 1-month-old and 12% in 2-month-old rats.
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