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The objective of this study was to identify the signs of the right ventricular dysfunction in patients with non-massive pulmonary artery thromboembolism (PE) using radionuclide gated blood pool SPECT (GBPS). The study included 55 patients: 40 with PE, and 15 - control group. Radionuclide studies included perfusion-ventilation scintigraphy and GBPS. GBPS results suggest that the signs of right ventricular dysfunction in PE are: the reduction in its stroke volume, as well as reduction in the peak filling and ejection rate. GBPS results allow distinguishing acute thromboembolism and chronic post-thromboembolic pulmonary hypertension.