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We examined the relationship between late potentials and left ventricular function from a hemodynamic point of view in 50 patients with prior myocardial infarction. Late potentials were found in 15 (30%) of 50 patients. A left ventricular aneurysm was found in 28 patients. Late potentials were detected in 14 (50%) of 28 patients with the aneurysm but in 1 (5%) of 22 patients without it (p less than 0.01). In the 50 patients, a hemodynamic data from the late potential positive group (n = 15) were compared to those from the late potential negative group (n = 35). The late potential positive group had a significantly lower ejection fraction, cardiac index and stroke volume than the late potential negative group. We further studied the 28 patients with left ventricular aneurysm in a similar way. The cardiac index and stroke volume were also significantly lower in the late potential positive group. The ejection fraction tended to be lower in the late potential positive group. These results suggest that left ventricular function and left ventricular aneurysm are among the factors that influence the development of late potentials.
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