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Use of gated 13N-NH3 micro-PET to examine left ventricular function in rats.

Abstract：

INTRODUCTION:Myocardial perfusion gating techniques offer the possibility of measurement of left ventricular end-systolic (ESV) and end-diastolic volume (EDV) and left ventricular ejection fraction (LVEF) in clinical and preclinical trials. The aim of this study was to evaluate left ventricular volumes (LVV) and LVEF with 13N-NH3 in comparison with the reference 18F-FDG in different rat models. METHODS:In this study, 18 male Wistar rats, 12 control rats and 6 rats with myocardial infarction (MI) were imaged with micro-PET. The ratswere scanned with gated 13N-NH3 and 18F-FDG sequentially for the assessment of LVV and LVEF. A validated three-dimensional segmentation algorithm was used to calculate LVV and LVEF. RESULTS:Mean LVEF measured with 13N-NH3 was 45.6±8.9 and 75.3±9.4%, mean ESV was 0.40±0.12 and 0.14±0.11 ml, and mean EDVwas 0.53±16 and 0.75±0.18 ml for MI and control rats, respectively. Moderate to good correlations were observed between values of 13N-NH3 and 18F-FDG for calculation of ESV [r=0.80, P<.0001, standard error of estimate (SEE)=0.10], EDV (r=0.63, P=.005, SEE=0.14) and LVEF (r=0.84, P<.0001, SEE=9.5). LVEF measured with 13N-NH3 was significantly lower in MI rats in comparison to measurement with 18F-FDG (45.6±8.9 vs 54.9±9.3 %; P=.04). CONCLUSION:Correlations were moderate to good for the assessment of ESV, EDV and LVEF between gated 13N-NH3 and 18F-FDG. LVEF was underestimated with gated 13N-NH3 in rats with myocardial infarction. In healthy rats, LV volumes and LVEF can be measured reproducibly with either approach.

journal_name

Nucl Med Biol

journal_title

Nuclear medicine and biology

authors

Szymanski MK,Kruizinga S,Tio RA,Willemsen AT,Schäfers MA,Stegger L,Dierckx RA,Hillege HL,Slart RH

doi

10.1016/j.nucmedbio.2011.12.009

subject

Has Abstract

pub_date

2012-07-01 00:00:00

pages

724-9

issue

5

eissn

0969-8051

issn

1872-9614

pii

S0969-8051(11)00313-1

journal_volume

39

pub_type

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