Abstract
Survivors of childhood cancer are at risk of cancer therapy-related cardiac dysfunction (CTRCD) characterized by systolic impairment, with little known about diastolic function. Left atrial strain (LAS) is a surrogate measure of left ventricular filling. We hypothesized that survivors (1) have lower LAS versus controls, and (2) survivors exposed to higher anthracycline dosage have even lower LAS. Cross-sectional study of 45 survivors exposed to anthracyclines ≥ 1 year after chemotherapy and 45 healthy controls. Echo variables included mitral spectral and tissue Doppler, left ventricular ejection fraction (LV EF), LV dimension, LA volume, LV global longitudinal strain (GLS), and LAS. Peak strain (Ɛ) and strain rate (SR) at three phases were obtained: atrial contraction (ac), reservoir (res), and conduit (con). Two sub-analyses of cancer survivors were performed: (1) those with anthracycline dosage ≥ 250 mg/m2, and (2) those with Ɛres in the lowest quartile. On the whole, survivors had lower Ɛres and Ɛcon values. The majority of survivors had relatively normal LAS, while a subset had very low LAS values and were more likely to be older. Survivors exposed to ≥ 250 mg/m2 anthracycline also had lower Ɛres than those < 250 mg/m2. There were no differences in mitral spectral/tissue Doppler, LV dimension, left atrial volume, or GLS. A subset of childhood cancer survivors have lower LAS than their healthy counterparts, while most are essentially normal. Those exposed to higher anthracycline dosage have even lower Ɛres. Longitudinal study of LAS may prove useful in monitoring for CTRCD.
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Abbreviations
- α:
-
Intraclass correlation coefficient
- ac:
-
Atrial contraction
- CI:
-
Confidence interval
- con:
-
Conduit
- CTRCD:
-
Cancer therapy-related cardiac dysfunction
- DT:
-
Deceleration time
- Ɛ:
-
Peak strain
- e′:
-
Tissue Doppler of lateral annulus
- GLS:
-
Global longitudinal strain
- IQR:
-
Interquartile range
- LAS:
-
Left atrial strain
- LV EF:
-
Left ventricular ejection fraction
- res:
-
Reservoir
- rho:
-
Spearman’s correlation coefficient
- SR:
-
Strain rate
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Acknowledgements
The authors would like to thank the staff at the Texas Children’s Hospital Cardiovascular Clinical Research Core for the help in data collection and analysis for this project.
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Supplementary file1 Supplemental Table: Comparisons of cancer survivors with Ɛres in the top 3 quartiles (n = 34) versus normal controls. (DOCX 12 kb)
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Loar, R.W., Colquitt, J.L., Rainusso, N.C. et al. Assessing the left atrium of childhood cancer survivors. Int J Cardiovasc Imaging 37, 155–162 (2021). https://doi.org/10.1007/s10554-020-01970-x
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DOI: https://doi.org/10.1007/s10554-020-01970-x