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a Catheterisation
Laboratory S Giovanni Hospital, Via N Piccolomini 34, 00165 Rome, Italy, b Istituto Anatomia Patologica, Pavia, Italy
Correspondence to: Dr Prati f.prati{at}libero.it
Accepted 9 January
2001
OBJECTIVE
To test the efficacy of
high frequency intravascular ultrasound (IVUS) transducers in
identifying lipid/necrotic pools in atherosclerotic plaques.
METHODS
40 MHz transducers were used
for in vitro IVUS assessment of 12 arterial segments (10 coronary and
two carotid arteries, dissected from five different necropsy cases).
IVUS acquisition was performed at 0.5 mm/s after ligature of the
branching points to generate a closed system. Lipid/necrotic areas were
defined by IVUS as large echolucent intraplaque areas surrounded by
tissue with higher echodensity. To obtain histopathological sections
corresponding to IVUS cross sections, vessels were divided into
consecutive 3 mm long segments using the most distal recorded IVUS
image as the starting reference. Samples were then fixed with 10%
buffered formalin, processed for histopathological study, serially cut, and stained using the Movat pentacrome method.
RESULTS
122 sections were analysed.
Lipid pools were observed by histology in 30 sections (25%). IVUS
revealed the presence of lipid pools in 19 of these sections (16%;
sensitivity 65%, specificity 95%).
CONCLUSIONS
In vitro assessment of
lipid/necrotic pools with high frequency transducers was achieved with
good accuracy. This opens new perspectives for future IVUS
characterisation of atherosclerotic plaques.
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