The online version of this article (doi:10.1186/1476-7120-10-40) contains supplementary material, which is available to authorized users.
The authors declare that they have no competing interest.
MMDR: acquisition of data, analysis and interpretation of IBS and data drafted the article. APF: revised it critically for important intellectual content. JLO: participated in the conception of the study and acquisition of data. MVS: substantial contributions to conception and design. AS: helped to draft the article and revised it critically for important intellectual content. ECC: participated in the acquisition of anatomo-pathological data, its analysis and interpretation. MR: gave important contributions to analysis and interpretation of anatomo-pathologic data. BCM: conceived the study and revised it critically for important intellectual content. All authors read and approved the final manuscript.
In the clinical setting, the early detection of myocardial injury induced by doxorubicin (DXR) is still considered a challenge. To assess whether ultrasonic tissue characterization (UTC) can identify early DXR-related myocardial lesions and their correlation with collagen myocardial percentages, we studied 60 rats at basal status and prospectively after 2mg/Kg/week DXR endovenous infusion. Echocardiographic examinations were conducted at baseline and at 8,10,12,14 and 16 mg/Kg DXR cumulative dose. The left ventricle ejection fraction (LVEF), shortening fraction (SF), and the UTC indices: corrected coefficient of integrated backscatter (IBS) (tissue IBS intensity/ phantom IBS intensity) (CC-IBS) and the cyclic variation magnitude of this intensity curve (MCV) were measured. The variation of each parameter of study through DXR dose was expressed by the average and standard error at specific DXR dosages and those at baseline. The collagen percent (%) was calculated in six control group animals and 24 DXR group animals. CC-IBS increased (1.29±0.27 x 1.1±0.26-basal; p=0.005) and MCV decreased (9.1± 2.8 x 11.02±2.6-basal; p=0.006) from 8 mg/Kg to 16mg/Kg DXR. LVEF presented only a slight but significant decrease (80.4±6.9% x 85.3±6.9%-basal, p=0.005) from 8 mg/Kg to 16 mg/Kg DXR. CC-IBS was 72.2% sensitive and 83.3% specific to detect collagen deposition of 4.24%(AUC=0.76). LVEF was not accurate to detect initial collagen deposition (AUC=0.54). In conclusion: UTC was able to early identify the DXR myocardial lesion when compared to LVEF, showing good accuracy to detect the initial collagen deposition in this experimental animal model.
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- Early detection of doxorubicin myocardial injury by ultrasonic tissue characterization in an experimental animal model
Minna Moreira Dias Romano
João Lucas O’Connel
Marcus Vinícius Simões
Érica C Campos
Benedito Carlos Maciel
- BioMed Central
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