J. Naito et al., ANALYSIS OF TRANSMURAL TREND OF MYOCARDIAL INTEGRATED ULTRASONIC BACKSCATTER IN PATIENTS WITH OLD MYOCARDIAL-INFARCTION, Ultrasound in medicine & biology, 22(7), 1996, pp. 807-814
Citations number
47
Categorie Soggetti
Radiology,Nuclear Medicine & Medical Imaging",Acoustics
Changes in myocardial integrated backscatter (IB) reflect myocardial v
iability in patients with myocardial infarction, IB may be obtained se
parately in the subendocardial and subepicardial layers to establish a
transmural trend, The purpose of this study is to examine the possibi
lities that the measurement of the transmural trend in myocardial IB m
ay provide a new estimate of transmurality of infarction in patients w
ith old myocardial infarction, A calibrated myocardial IB and its tran
smural trend were measured both in the septum and posterior wall in 21
normal subjects, 24 patients with anteroseptal old myocardial infarct
ion (13 patients with Q-wave myocardial infarction and 11 patients wit
h non-Q-wave myocardial infarction), The transmural trend in myocardia
l IB was assessed by measuring the acoustic parameter separately in th
e right and left ventricular halves of the septum, and in the endocard
ial and epicardial halves of the posterior wall, The magnitude of cycl
ic variation of IB (a difference between minimum and maximum peaks) wa
s lower, and calibrated myocardial IB (the maximum value of myocardial
IB at end diastole calibrated with the power of Doppler signals from
the blood along the same ultrasound beam) was higher in patients with
anteroseptal old myocardial infarction in the septum, compared with no
rmal subjects. Among patients with myocardial infarction, the differen
ce in these IB parameters between the right and left ventricular halve
s of the septum was found only in patients with non-Q-wave myocardial
infarction, The transmural trend of myocardial IB was likely to reflec
t the transmurality of myocardial infarction, Therefore, our data give
another insight into the assessment of transmural inhomogeneity of my
ocardial fibrosis or viability in patients with myocardial infarction.