TY  - JOUR
AU  - Francesc Carreras
AU  - Jaume Garcia
AU  - Debora Gil
AU  - Sandra Pujadas
AU  - Chi ho Lion
AU  - R.Suarez-Arias
AU  - R.Leta
AU  - Xavier Alomar
AU  - Manuel Ballester
AU  - Guillem Pons-Llados
PY  - 2012//
TI  - Left ventricular torsion and longitudinal shortening: two fundamental components of myocardial mechanics assessed by tagged cine-MRI in normal subjects
T2  - IJCI
JO  - International Journal of Cardiovascular Imaging
SP  - 273
EP  - 284
VL  - 28
IS  - 2
PB  - Springer Netherlands
KW  - Magnetic resonance imaging (MRI)
KW  - Tagging MRI
KW  - Cardiac mechanics
KW  - Ventricular torsion
N2  - Cardiac magnetic resonance imaging (Cardiac MRI) has become a gold standard diagnostic technique for the assessment of cardiac mechanics, allowing the non-invasive calculation of left ventric- ular long axis longitudinal shortening (LVLS) and absolute myocardial torsion (AMT) between basal and apical left ventricular slices, a movement directly related to the helicoidal anatomic disposition of the myocardial fibers. The aim of this study is to determine AMT and LVLS behaviour and normal values from a group of healthy subjects. A group of 21 healthy volunteers (15 males) (age: 23–55 y.o., mean:30.7 ± 7.5) were prospectively included in an obser- vational study by Cardiac MRI. Left ventricular rotation (degrees) was calculated by custom-made software (Harmonic Phase Flow) in consecutive LV short axis planes tagged cine-MRI sequences. AMT was determined from the difference between basal and apical planes LV rotations. LVLS (%) was determined from the LV longitudinal and horizontal axis cine-MRI images. All the 21 cases studied were interpretable, although in three cases the value of the LV apical rotation could not be determined. The mean rotation of the basal and apical planes at end-systole were -3.71° ± 0.84° and 6.73° ± 1.69° (n:18) respectively, resulting in a LV mean AMT of 10.48° ± 1.63° (n:18). End-systolic mean LVLS was 19.07 ± 2.71%. Cardiac MRI allows for the calculation of AMT and LVLS, fundamental functional components of the ventricular twist mechanics conditioned, in turn, by the anatomical helical layout of the myocardial fibers. These values provide complementary information about systolic ventricular function in relation to the traditional parameters used in daily practice.
SN  - 1569-5794
UR  - http://www.springerlink.com/content/j51723m3726h1074/
UR  - http://dx.doi.org/10.1007/s10554-011-9813-6
N1  - IAM;
ID  - Francesc Carreras2012
ER  -