Myocardial Perfusion Scintigraphy in the Prediction of the Existence of Hemodynamically Significant Coronary Artery Stenosis
Nuclear Medicine Prediction of the Hemodynamic Significance of Coronary Artery Stenosis
Abstract
Introduction/Aim. Anatomically unsignificant stenosis of coronary arteries obtained on coronary angiography, can show hemodynamic significance and as such cause myocardial ischemia. The goal was to assess the diagnostic accuracy of myocardial perfusion scintigraphy (SPECT MPI) in the detection of hemodinamicaly significant coronary artery stenosis in patients with moderate risk for ischemia, without previously detected coronary disease.
Patients and methodology. The study included 258 patients, of which 54% females and 46% males, average age of 59.0 ± 10.1 years. SPECT MPI was done by a two-day protocol with 99mTc-MIBI. The pathological finding was the existence of perfusion defects. Coronary angiography (CA) was done by standard protocol. Anatomically significant coronary artery narrowing was >70%. Stenoses from 30% to 69% were considered hemodynamically significant in patients with reversible perfusion defects on SPECT MPI.
Results. The sensitivity (SE) of SPECT MPI was 89%, specificity (SP) 42%, positive predictive value (PPV) 86%, negative predictive value (NPV) 50%, and total diagnostic accuracy (ACC) was 74% when the results were compared with stenosis >70%. By including stenosis from 30% to 69%, the obtained values of diagnostic indicators of SPECT MPI reliability were: SE 91%; SP 100%; PPV 100%; NPV 50% and ACC 91%.
Conclusion. With CA only, it is not possible to prove the existence of hemodynamic significance of coronary artery stenoses from 30% to 69%. SPECT MPI shows high SE, SP, PPV, and ACC in detecting the existence of left ventricular myocardium perfusion disorder in either stenosis of coronary arteries with or without anatomically significant value.
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