Assessment of Global Longitudinal Strain for the Prediction of Anthracycline Induced Cardiotoxicity

Study population:

This is a single-centre, prospective cohort study. The patients are evaluated at four time points: visit 1 (V1), before the initiation of anthracycline therapy; visit 2 (V2), after reaching a cumulative dose of 150 mg/m²; visit 3 (V3), at the end of the treatment; and visit 4 (V4), 1 year after V1.

Clinical examination at each visit and standard echocardiography are performed. The study is approved by our ethics committee (EudraCT number 2011-002721- 22).

Two-dimensional echocardiography:

Echocardiography examinations are performed using a Vivid E9 imaging device (GE Medical systems, Horten, Norway). The left ventricular end-diastolic and endsystolic volumes are measured from the apical two- and four-chamber views; LVEF are calculated using Simpson's rule. GLS is computed from high frame rate (>50 frames per second) apical views (four-, two-, and three-chamber). By tracing the endocardial borders on an end-systolic frame, myocardial speckles are automatically tracked on the subsequent frames. Adequate tracking is verified, and manually corrected if necessary. GLS is obtained as the average of regional strains. Percentage change in GLS and absolute reduction in GLS are calculated between baseline and V2. Other classic diastolic and systolic parameters are recorded according to current guidelines. Digital loops are stored for off-line analysis. For LVEF and GLS, digital loops are done in triplicate to assess inter- and intraobserver variability. LVEF and GLS are analysed by two readers. The readers are blinded to each other's measurements and to the patient visit number.

Echocardiographic definition of AIC:

According to a recent consensus paper, anthracycline cardiotoxicity is defined as a decrease in the LVEF of >10 percentage points, to a value <53%, at V4. This decrease has to be confirmed by a repeat echocardiography performed a few weeks after V4.

Inclusion criteria

• patients suffering from lymphoma or leukemia and requiring anthracycline therapy;
• over 18 years old;
• baseline LVEF >50%.

Exclusion criteria

• moderate to severe aortic or mitral valve disease;
• pregnant or breastfeeding women;
• atrial fibrillation;
• very poor image quality defined by two or more myocardial segments inadequately visualized (17-segment model);
• unstable cardiac condition such as pericardial effusion or acute coronary syndrome.