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Normal Limits of Left Ventricular Volumes and Ejection Fraction Measured by Gated Myocardial Perfusion SPECT: Comparison of Tc-99m MIBI and Tl-201  

Hyun, In-Young (Departments of Nuclear Medicine Inha University College of Medicine)
Seo, Jeong-Kee (Departments of Internal Medicine, Inha University College of Medicine)
Kwan, Jun (Departments of Internal Medicine, Inha University College of Medicine)
Park, Keum-Soo (Departments of Internal Medicine, Inha University College of Medicine)
Choe, Won-Sick (Departments of Nuclear Medicine Inha University College of Medicine)
Lee, Woo-Hyung (Departments of Internal Medicine, Inha University College of Medicine)
Publication Information
The Korean Journal of Nuclear Medicine / v.37, no.3, 2003 , pp. 147-152 More about this Journal
Abstract
Purpose: We evaluated radioisotope and sex-specific differences of normal limits for left ventricle volumes (LWs) and ejection fraction (EF) using myocardial perfusion gated SPECT (g-SPECT). Materials and Methods: Rest Tl-201/post-stress Tc-99m MIBI g-SPECT measurements with acquisitions of 8-frame were evaluated for 70 patients (mean age $55{\pm}14.56%$ female) who either had < 10% pretest likelihood of CAD (n = 12) or had normal coronary angiography (EF > 50%) (n = 58). LVEF, LWs were automatically determined by quantitative gated SPECT using QGS program. Results: Similar results were obtained for mean LVEF between Tc-99m MIBI ($62%{\pm}7%$ and Tl-201 ($63%{\pm}8%$) g-SPECT measurements. In Contrast, Tl-201 g-SPECT had significantly lower LWs values ($EDV;\;74{\pm}23mL,\;ESV;\;28{\pm}14mL$) than Tc-99m MIBI g-SPECT ($EDV;\;82{\pm}25mL,\;ESV;\;32{\pm}15mL$) (p<0.05). Women had significantly lower EDV ($Tc-99m\;MIBI;\;71{\pm}18mL,\;Tl-201;\;65{\pm}17mL$), and ESV values ($Tc-99m\;MIBI;\;27{\pm}10mL,\;Tl-201;\;23{\pm}8mL$) compared with EDV ($Tc-99m\;MIBI;\;96{\pm}27mL,\;Tl-201;\;85{\pm}24mL$), and ESV Values ($Tc-99m\;MIBI;\;40{\pm}17mL,\;Tl-201;\;36{\pm}16mL$) of men (p<0.05). Women had significantly higher LV EF Values ($65%{\pm}7%$) than men ($60%{\pm}8%$) by Tl-201 gated SPECT (p<0.05). Conclusion: These data suggest significant differeuces in normal limits for LWs and EF, according to genders and radiopharmaceutical. Therefore, the evaluation of cardiac function in patients should consider radioisotope and sex-matched normal values.
Keywords
Ejection fraction; Gated SPECT; Left ventricular volumes; Normal limits;
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