Key result
Moderate pressure-overload hypertrophy induced by DOCA-salt in rats significantly prolonged contraction duration (Tmax 59.7 vs 53.4 msec) while maintaining normal myocardial contractility.
Why the study?
Does moderate pressure-overload hypertrophy alter myocardial contractility and contraction duration in isolated rat hearts?
Population
14 female Wistar rats; 7 with DOCA-salt induced pressure-overload hypertrophy and 7 age-matched controls.
Comparison
DOCA-salt induced pressure-overload hypertrophy… vs Age-matched control rats without DOCA…
Design
Preclinical
Follow-up
8 weeks after surgery
Authors
Loading...
Suggests adaptive timing changes in hypertrophy; leaves open human relevance and clinical translation.
Does moderate pressure-overload hypertrophy alter myocardial contractility and contraction duration in isolated rat hearts?
Absolute Event Rate: 59.7% vs 53.4%
p-value: p=<0.01
In a rat model of moderate pressure-overload hypertrophy, contraction duration is prolonged despite normal myocardial contractility, suggesting an independent response to hemodynamic stress.
Aoyagi et al. (1991) studied Moderate pressure-overload hypertrophy (n=14). DOCA-salt induced hypertrophy vs. Age-matched controls was evaluated on Time to maximum stiffness (Tmax) at baseline in msec (p=<0.01). Moderate pressure-overload hypertrophy induced by DOCA-salt in rats significantly prolonged contraction duration (Tmax 59.7 vs 53.4 msec) while maintaining normal myocardial contractility.