Left ventricular twisting and untwisting motion in childhood cancer survivors

Echocardiography. 2011 Aug;28(7):738-45. doi: 10.1111/j.1540-8175.2011.01429.x. Epub 2011 May 25.

Abstract

Background: Anthracycline has been shown to degrade titin that plays a role in myocardial twisting and untwisting. This study aimed to test the hypothesis that left ventricular (LV) twisting and untwisting motion may be altered in children after anthracycline therapy.

Methods: Thirty-six childhood leukemia survivors aged 15.6 ± 5.5 years and 20 healthy controls aged 16.8 ± 7.7 years (P = 0.54) were studied. LV twisting and untwisting motion was determined using speckle tracking imaging, whereas LV ejection fraction and systolic and diastolic mitral annular velocities were determined respectively by three-dimensional and tissue-Doppler echocardiography.

Results: Compared with controls, patients had significantly lower LV ejection fraction (P = 0.01) but similar systolic and diastolic mitral annular velocities (all P > 0.05). Their peak LV torsion (P = 0.003), systolic twisting velocity (P < 0.001), and diastolic untwisting velocity (P = 0.04) were significantly lower than controls, which could be attributable to their reduced apical rotation (P = 0.03) and apical untwisting rate (P = 0.002). For the whole cohort, LV systolic torsion and twisting velocity correlated significantly with apical untwisting rate (P < 0.001) and LV diastolic untwisting velocity (P < 0.001). In patients, none of the twisting or untwisting parameters were found to correlate with cumulative anthracycline dose (all P > 0.05). Twenty-eight (78%) patients had LV ejection fractions ≥50%. Although their systolic and diastolic mitral annular velocities were similar to those of controls, their peak LV torsion (P = 0.005), apical untwisting rate (P = 0.01), and LV systolic twisting velocity (P = 0.001) remained significantly lower.

Conclusion: Impairment of LV twisting and untwisting motion is evident in children after anthracycline therapy, even in those with "normal" LV ejection fractions.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Anthracyclines / adverse effects*
  • Anthracyclines / therapeutic use
  • Case-Control Studies
  • Child
  • Child, Preschool
  • Echocardiography, Doppler / methods*
  • Echocardiography, Three-Dimensional / methods*
  • Female
  • Humans
  • Image Interpretation, Computer-Assisted
  • Male
  • Precursor Cell Lymphoblastic Leukemia-Lymphoma / drug therapy*
  • Survivors
  • Torsion Abnormality / chemically induced*
  • Torsion Abnormality / diagnostic imaging*
  • Torsion Abnormality / physiopathology*
  • Ventricular Dysfunction, Left / chemically induced*
  • Ventricular Dysfunction, Left / diagnostic imaging*
  • Ventricular Dysfunction, Left / physiopathology*
  • Young Adult

Substances

  • Anthracyclines