STRAIGHT LEG RAISING WHILE PERFORMING ”"TECHNETIUM SESTAMIBI INJECTION AT REST CAN REDUCE INFERIOR WALL ARTIFACT IN PATIENTS WITH A LOW-LIKELIHOOD OF CORONARY ARTERY DISEASE
Keywords:
artifact, coronary artery disease, low-level exercise, technetium-99m sestamibiAbstract
Inferior wall artifacts (IWA) are frequently found in 99mTc sestamibi resting myocardial perfusion imaging (MPI) ofa low-likelihood of coronary artery disease patients (LCP). Straight leg raising (SLR) relatively decreases proportion of sestamibi in the liver, so it may reduce subdiaphragmatic activity that can potentially cause [WA. Aim of the study is to investigate whether SLR while performing 99mTc sestamibi rest injection can reduce the incidence of WA.
Methods: Incidence of hot and cold IWA were compared between 72 LCP performing SLR during 99mTc sestamibi rest injection and 125 LCP without SLR. Three inferior segments from 20-segment model were used for myocardial grading.
Results: Age, sex, body weight and stress method for MPI were not significantly different between the two groups. The SLR group had a significantly higher incidence of non-artifact patients compared with the non-SLR group (18.1% versus 4.8%, P= 0.002). The SLR group also hada significantly lower incidence of hot IWA. (19.4%vs 41.6%, P= 0.002). Incidence of cold IWA were not different between the two groups (P = 0.225). Analysis of cold IWA patients showed less severe, even not significantly (P = 0.085), different, the same as artifact in the SLR group compared with the non-SLR group.
Conclusion: SLR while performing rest injection can reduce the incidence of hot IWA in LCP and may help in the detection of the lesions in the right coronary artery or left circumflex coronary territories.
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