Residual exertional ischemia and unfavorable left ventricular remodeling in patients with systolic dysfunction after anterior myocardial infarction.
OBJECTIVE
This study investigated whether exercise-induced myocardial ischemia influences left ventricular remodeling after anterior myocardial infarction.


BACKGROUND
The effects of acute and recurrent ischemia on ventricular function are well established. However, to our knowledge the role of exertional ischemia in the remodeling response after infarction has not been investigated.


METHODS
Ninety-one patients with a first anterior Q wave myocardial infarction were studied at 5 weeks by rest echocardiography and exercise scintigraphy. The echocardiographic examination was repeated 6 months later. On the basis of the presence and extent of reversible perfusion defects on exercise scintigraphy, patients were assigned to groups with no exertional ischemia (group 1, n = 20 [22%], mild to moderate ischemia (group 2, n = 45 [49%]) and severe exertional ischemia (group 3, n = 26 [29%]).


RESULTS
Initial left ventricular volumes were similar, and no differences were found among the three groups in the remodeling response over the 6-month period of the study. However, patients in groups 2 and 3 with an ejection fraction < or = 40% showed significant (p < 0.01) ventricular enlargement over time, which was similar between the two groups (end-diastolic volume [mean +/- SD] from 74 +/- 13 to 80 +/- 17 ml/m2 in group 2 and from 72 +/- 11 to 81 +/- 19 ml/m2 in group 3; regional dilation from 42 +/- 16% to 52 +/- 22% in group 2 and from 38 +/- 18% to 46 +/- 27% in group 3). In contrast, ventricular dimensions did not change in group 1 patients with an ejection fraction < or = 40% as well as in patients in all three groups with an ejection fraction > 40%.


CONCLUSIONS
Exercise-induced myocardial ischemia may contribute to progressive ventricular enlargement in patients with poor left ventricular function after a large anterior myocardial infarction.
Giannuzzi
P
P
Clinica del Lavoro Foundation, Medical Center of Rehabilitation, Veruno, Italy.
Marcassa
C
C
Temporelli
P L
PL
Galli
M
M
Corrà
U
U
Imparato
A
A
Silva
P
P
Gattone
M
M
Campini
R
R
Giordano
A
A
D000704:Analysis of Variance; D017023:Coronary Angiography; D004452:Echocardiography; D004562:Electrocardiography; D005080:Exercise Test; D017079:Exercise Tolerance / Q000502:physiology; D006321:Heart / Q000000981:diagnostic imaging; D006801:Humans; D017379:Hypertrophy, Left Ventricular / Q000175:diagnosis / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000150:complications / Q000503:physiopathology*; D017202:Myocardial Ischemia / Q000175:diagnosis / Q000503:physiopathology*; D011446:Prospective Studies; D011877:Radionuclide Imaging; D013599:Systole / Q000502:physiology*; D017256:Technetium Tc 99m Sestamibi; D018487:Ventricular Dysfunction, Left / Q000175:diagnosis / Q000503:physiopathology*
D017256:Technetium Tc 99m Sestamibi