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Objectives   This work aimed to study the efficacy of hybrid  99m Tc-Pyrophosphate SPECT/CT for diagnosis of latent inflammatory processes in the myocardium of patients with atrial fibrillation (AF).Methods   The study comprised 34 patients aged 44 ± 9 years with AF of unknown etiology referred for radiofrequency ablation. The data were acquired using hybrid  99m Tc-Pyrophosphate SPECT/CT. To evaluate and interpret the results of hybrid study and to determine localization of radiopharmaceutical accumulation, scintigraphic and CT images were fused. SPECT/CT results were compared with data of endomyocardial biopsy.Results   Sensitivity, specificity, and accuracy of  99m Tc-Pyrophosphate SPECT/CT in diagnosing myocarditis were 91%, 100%, and 94%, respectively. Proposed diagnostic criteria for myocarditis comprised intensity of the radiopharmaceutical accumulation in the myocardium and the ratios of focus/lung, focus/vertebral column, and focus/LV pool. Minimum cutoff values for the histologically verified myocarditis were >1.47 for focus/lung index, >0.11 for focus/vertebral column ratio, and >1.26 for focus/lung index.Conclusions   SPECT/CT-based quantitative assessment of  99m Tc-Pyrophosphate accumulation in the myocardium is a highly informative noninvasive method for diagnosis of inflammatory process in the heart in patients with AF of undefined etiology.

cardiology research and practice

Diagnostic Efficacy of Cardiac Scintigraphy with <sup>99m</sup>Tc-Pyrophosphate for Latent Myocardial Inflammation in Patients with Atrial Fibrillation

Diagnostic Efficacy of Cardiac Scintigraphy with 99mTc-Pyrophosphate for Latent Myocardial Inflammation in Patients with Atrial Fibrillation

Diagnostic Efficacy of Cardiac Scintigraphy with ^99mTc-Pyrophosphate for Latent Myocardial Inflammation in Patients with Atrial Fibrillation