Linked Life Data

17935862

Source:http://linkedlifedata.com/resource/pubmed/id/17935862

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2008-2-25
pubmed:abstractText
The aim of our study was to determine if strain (S) and strain rate (SR) imaging are more sensitive indices with respect to standard echocardiographic parameters to assess cardiac function in an experimental model of doxorubicin (DOX)-induced cardiomyopathy. DOX was administered intraperitoneally 4x/wk at the dose of 1.25 mg/kg/d over four weeks in Wistar rats (n = 26). Other 14 Wistar rats were used as controls. Echocardiographic studies were performed before DOX treatment (baseline), after two and four weeks of treatment. At two and four weeks of DOX treatment, rat hearts were collected for histologic analysis. After two weeks of DOX treatment, there were no significant changes in standard echocardiographic parameters and in myocardial velocities, but after four weeks of treatment, ejection fraction significantly decreased and left ventricle dimensions significantly increased. Also, myocardial velocities were significantly reduced after four weeks of treatment. Conversely, S and SR values changed significantly already after two weeks of treatment. At baseline, S and SR values were 27 +/- 7% and 7.4 +/- 1.7, respectively, and they significantly decreased to 12 +/- 6% (p < 0.0001) and 6 +/- 1.5 (p < 0.005) at two weeks of treatment. These changes were also significant compared with control rat parameters (p < 0.001). At four weeks of DOX treatment, a progressive worsening occurred. Strain and SR further significantly decreased to 10 +/- 4% (p < 0.0001 vs. baseline) and 4.6 +/- 1.6 (p < 0.0001 vs. baseline), respectively. These changes were supported by histologic findings. Indeed, damage in myocardial tissue was demonstrated by histology already after two weeks of DOX treatment, with a damage progression after four weeks of treatment. Our data demonstrate that S and SR imaging are more sensitive indices in identifying early myocardial systolic changes induced by DOX than standard echocardiographic parameters and myocardial velocities. We believe that our model will be very supportive to further assess these new diagnostic strategies to provide a precocious diagnosis of LV dysfunction with a unique opportunity to initiate preventive cardioactive therapy. (E-mail: giodisal@yahoo.it).
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0301-5629
pubmed:author
pubmed:issnType
Print
pubmed:volume
34
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
370-8
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Myocardial strain analysis in a doxorubicin-induced cardiomyopathy model.
pubmed:affiliation
Department of Experimental Medicine and Excellence Research Centre for Cardiovascular Diseases, Second University of Naples, Naples, Italy.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't