Key result
Prior MI linked to ~45% lower LV efficiency vs controls, driven by diminished LV work.
Why the study?
The effect of coronary artery disease and prior myocardial infarction on left ventricular mechanical efficiency and cardiac energetics was not fully characterized.
Population
36 patients undergoing coronary arteriography including 8 controls, 15 with CAD without MI, and 13 with CAD and prior MI
Comparison
Patients with CAD without prior MI and patients with CAD and prior MI versus controls with normal coronary arteriograms
Design
Observational study measuring myocardial blood flow, oxygen consumption, and left ventricular function
Authors
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May support efficiency monitoring post-MI; leaves open whether efficiency-targeted interventions improve outcomes.
Observational (n=36)
Absolute Event Rate: 15.9% vs 28.8%
p-value: p=<0.001
Patients with prior myocardial infarction exhibit significantly reduced left ventricular mechanical efficiency driven by decreased left ventricular work despite normal oxygen consumption.
Nichols et al. (1986) conducted an observational in Coronary artery disease and prior myocardial infarction (n=36). Prior myocardial infarction vs. Control patients with normal coronary arteriograms and normal left ventricular function was evaluated on Left ventricular efficiency (p=<0.001). Prior myocardial infarction was associated with significantly reduced left ventricular efficiency compared to controls (15.9% vs 28.8%, P<0.001) as a result of diminished left ventricular work.
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