[Anthracycline cardiotoxicity evaluated by digitized M-mode echocardiography].
Ten patients with malignant diseases whose mean age was 20.0 +/- 13.2 years received anthracycline derivatives therapy and were evaluated for their left ventricular systolic and diastolic functions by computer-assisted digitized M-mode echocardiography. Fractional shortening (%FS), a parameter of systolic function, was measured. The first derivative of left ventricular dimension change (peak LV dD/dt), posterior wall thinning (peak LVPW thinning rate) and interventricular septum thinning (peak IVS thinning rate) were used as indices of diastolic function. Blood pressure (BP) was measured noninvasively at the end of the echocardiographic examination and hemoglobin concentration (Hb) was measured on the same day. These examinations were performed immediately before administration of anthracycline and one week and one month after the last administration. Statistical analyses were performed using the Student's t-test. The mean BP, HR, LVDd, LVDs, LVPW and IVS remained unchanged following the drug administration. %FS did not change significantly; 36.8 +/- 6.3%, before the administration, 35.3 +/- 6.5%, one week after the administration, and 36.5 +/- 5.1%, one month after the administration. Peak LVdD/dt and the peak LVPW thinning rate decreased appreciably from 4.46 +/- 1.10 to 3.76 +/- 1.08, and from 7.99 +/- 1.55 to 6.41 +/- 1.04, respectively, one week after the administration. The peak IVS thinning rate decreased from 3.54 +/- 0.81 to 2.99 +/- 0.79 after one week (p < 0.01). All of these values returned to the control levels in one month after the drug administration. We concluded that the indices of left ventricular diastolic function were more sensitive for detecting cardiac impairment than those of systolic function during the course of anthracycline therapy.