Comparison of early thallium-201 scintigraphy and gated blood pool imaging for predicting mortality in patients with acute myocardial infarction.

Abstract

SUMMARY The extent of abnormality in early thallium-201 and gated cardiac blood pool scintigrams has been reported to be useful for predicting mortality in patients with acute myocardial infarction (AMI). To compare the two techniques, 91 patients admitted consecutively with evident or strongly suspected AMI underwent both imaging studies within 15 hours of the onset of symptoms. Patients with pulmonary edema or shock were excluded. AMI developed in 84% of patients, and 6-month mortality for the entire group was 16%. A thallium defect score of 7.0 or greater (corresponding to at least a moderate reduction of activity involving 40% of the left ventricular circumference) identified a subgroup of 14 patients with 64% 6-month mortality rate. Similarly, a left ventricular ejection fraction of 35% or less identified a high-risk subgroup of 10 patients with a 6-month mortality of 60%. Mortality in the remaining patients was 8% for thallium score less than 7 and 11% for ejection fraction greater than 35%. The mortality rate was highest among patients who had concordant high-risk scintigrams (five of six, 83%), lowest in those with concordant low-risk studies (five of 64, 8%) and intermediate in those with discordant results (four of 11, 36%). Of a number of clinical variables, only the appearance of Q waves, peak creatine kinase > 1000 IU/l, and history of infarction were significantly associated with mortality. High-risk thallium or blood pool scintigraphic results were significantly more predictive and a thallium score of 7 or greater was more sensitive for detecting nonsurvivors than ejection fraction 35% or less at a similar level of specificity. Stepwise multiple logistic analysis showed that the thallium score was the best predictor of mortality, but that appearance of Q waves and ejection fraction were additive. Using these three variables, 11 patients were calculated to have a 50% or greater chance of dying and eight (73%) actually died, compared with six of 70 (9%) with a calculated chance of death of less than 50%. These results in a prospectively identified and consecutive group of patients support the value of early thallium and blood pool scintigraphy for separating high-and low-risk subgroups of hemodynamically stable infarct patients.PATIENTS with acute myocardial infarction admitted in pulmonary edema or cardiogenic shock are at a high risk for early death. Those who demonstrate lesser degrees of hemodynamic compromise, in clinical class I or II, have a much better prognosis as a

Prognostic value of radionuclide angiography in medically treated patients with coronary artery disease. A comparison with clinical and catheterization variables.

“…In studies without an exercise protocol, rest EF was an important predictor of outcome. [53][54][55][56][57][58] Where exercise studies were conducted, exercise EF was found to be a significant predictor.9,47-49 Two studies reported that the change in EF during exercise was prognostically important,50,51 whereas in other studies9,52 this was not found to be the case. The prognostic importance of exercise EF in our study is most consistent with the observations reported by Morris and coworkers9 in a population of patients who survived acute MI, had rest and exercise RNA gated equilibrium studies after MI, and were subsequently followed.…”

Predictive value of NT-pro BNP after acute myocardial infarction: Relation with acute and chronic infarct size and myocardial function

“…Infarct size is an important prognostic variable with a strong correlation with mortality after acute myocardial infarction (AMI) [1,2]. Left ventricular function is a powerful prognostic indicator too, and is strongly and inversely related to patients' outcome, with rapidly increasing mortality rates at left ventricular ejection fraction (LVEF) <40% [3].…”

Correlation of Plasma Concentrations of B-Type Natriuretic Peptide With Infarct Size Quantified by Tomographic Thallium-201 Myocardial Scintigraphy in Asymptomatic Patients With Previous Myocardial lnfarction

“…Therefore, the present study was designed to examine whether the plasma concentrations of ANP and BNP serve as a clinical indicator of the extent of MI, an important determinant of mortality. 13 For these purposes we examined the relationship of plasma concentrations of ANP and BNP with the infarct size quantitatively calculated with thallium-201 single photon emission computed tomography (SPECT), a noninvasive and accurate method of assessment during the chronic phase of MI. …”

“…13 For these purposes we examined the relationship of plasma concentrations of ANP and BNP with the infarct size quantitatively calculated with thallium-201 single photon emission computed tomography (SPECT), a noninvasive and accurate method of assessment during the chronic phase of MI. 14 …”