Sammendrag
There are unresolved questions related to the proper use of editing the
region of interest (ROI) for measurements of global longitudinal strain
(GLS). The purpose of the present study was to compare the semi-automatic
default GLS value by the vendor's software with manually adjusted GLS and
test the impact on GLS measures with different ROI widths. We selected 25
patients post myocardial infarction treated with PCI who had excellent
echocardiographic recordings after 2-5 days and 3 months. The different
GLS values were assessed from these 50 analyses in three steps. The
semi-automatically GLS by default ROIs was compared with manually adjusted
ROIs widths selected by an expert and then with manual adjustments, but
with fixed ROIs being narrow, medium and wide. Their mean age was 64 (+/-
12) years, 52% had ST elevation MI and mean LVEF was 52 (+/- 4)%. Mean
default GLS was - 15.3 (+/- 2.5)% with the widest ROI level selected
semi-automatically in 78% of all widths. The mean expert GLS with manually
adjusted ROI was - 14.7 (+/- 2.4)%, and the medium ROI level was selected
by the expert in 85% of all examinations. The mean adjusted GLS, but with
fixed ROIs widths was - 15.0 (+/- 2.5%)% with narrow ROI, - 14.7 (+/-
2.6)% with medium and - 13.5 (+/- 2.3)% with wide ROI width (p
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