Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Regional dysfunction correlates with myofiber disarray in transgenic mice with ventricular expression of ras
Ist Teil von
American journal of physiology. Heart and circulatory physiology, 2000-03, Vol.278 (3), p.H898-H906
Ort / Verlag
United States
Erscheinungsjahr
2000
Quelle
MEDLINE
Beschreibungen/Notizen
1 Department of Bioengineering and
2 Department of Medicine, University of
California San Diego, La Jolla, California 92093
A hallmark of certain
cardiac diseases such as familial hypertrophic cardiomyopathy is focal
myofiber disarray. Regional ventricular dysfunction occurs in human
subjects with hypertrophic cardiomyopathy; however, no direct evidence
exists to correlate regional dysfunction with myofiber disarray. We
used a transgenic mouse, which exhibits regional myofiber disarray via
ventricular expression of the human oncogene ras, to
investigate the relationship between myofiber disarray and septal
surface strain. An isolated ejecting mouse heart preparation was used
to record deformation of markers on the septal surface and to determine
nonhomogeneous septal surface strain maps. Myofiber disarray made in
histological tissue sections was correlated with gradients in surface
systolic shortening. Significantly smaller maximum principal shortening
was associated with disarray located near the right ventricle (RV)
septal surface. There was also significantly smaller surface shear
strain associated with disarray located either near the RV surface or
at the midwall. Because surface shear is a local indicator of torsion,
we conclude that myofiber disarray is associated with reduced septal
torsion and reduced surface shortening.
hypertrophic cardiomyopathy; fiber angle; surface strain; ventricular torsion