Key Points
- To determine the early and late effects of myocardial infarction on left ventricular diastolic function using serial echocardiographic and Doppler imaging in a postinfarction rabbit model.
- Male New Zealand White rabbits were randomly assigned to circumflex artery ligation or sham operation (n = 10 per group).
- Serial echocardiographic and Doppler assessments were performed at baseline, 1 hour, and 3 weeks post-surgery following reproducibility verification.
- At 1 hour postinfarction, early mitral inflow velocity (E wave) and atrial contraction velocity (A wave) decreased, while pulmonary venous systolic-to-diastolic ratio and A wave reversal velocities increased without changes in left ventricular geometry.
- At 3 weeks postinfarction, animals developed severe diastolic dysfunction with an increased mitral E-to-A ratio (2.9 ± 0.9 vs. 1.1 ± 0.3, P < 0.001), increased left atrial area (510 ± 72 vs. 131 ± 23 mm², P < 0.001), and a decreased pulmonary venous systolic-to-diastolic ratio (0.56 ± 0.20 vs. 0.79 ± 0.14, P = 0.008).
Structured PICO
Does circumflex artery ligation induce echocardiographic changes consistent with LV diastolic dysfunction in a rabbit model?
PPopulationMale New Zealand White rabbits (n=20, 10 per group)
IInterventionLigation of the circumflex artery to induce myocardial infarction
OOutcomeEchocardiographic and Doppler changes in left ventricular (LV) diastolic function at 1 hour and 3 weeks post-surgerysurrogate
Coronary artery ligation in rabbits provides a reproducible echocardiographic model of LV diastolic dysfunction that resembles human heart failure with preserved systolic function post-myocardial infarction.