Author/Editor		Kirn, Borut
Title		Error evaluation of ventricular mechanisms measurement in patients with discoordinate ventricular contraction
Type		članek
Vol. and No.		Letnik 3
Publication year		2014
Language		eng
Abstract		In patients with discoordinate ventricular contraction, accurate identification of local mechanics from all heart regions is essential. Current measurement techniques are imperfect because a large part of the ventricular wall may be excluded, resulting in non-physiological average strain. In order to evaluate this error, we propose to compare the measured average strain to a reference strain obtained by averaging through a series of measurements. We assessed magnetic resonance (MR)-tagged images and determined circumferential strain in 160 regions of the ventricular wall in 10 patients with idiopathic dilated cardiomyopathy and left bundle branch block and 9 healthy volunteers. For each subject a global strain was calculated as the average of all measured strains. Then a reference strain was determined as the average of global strains for both experimental groups. The reference strains of a patient group and healthy controls both had a physiological pattern, with a peak shortening of -0.034 and -0.15, respectively. A large difference between the measured global strain and the reference strain indicates measurements which have large regions of ventricular wall which are excluded in the measurements.
Keywords		ventricular contraction measurement techniques reference strain krčenje prekata merilne metode referenčni sev