Impact of obesity and acquisition protocol on (123)I-metaiodobenzylguanidine indexes of cardiac sympathetic innervation(93 visite) Pellegrino T, Piscopo V, Boemio A, Russo B, De Matteis G, Pellegrino S, Giorgio SM, Amato M, Petretta M, Cuocolo A
*** IBB - CNR *** 1 Institute of Biostructure and Bioimaging, National Council of Research, Via De Amicis 95, 80145 Naples, Italy ; 2 Department of Advanced Biomedical Sciences, 3 Department of Translational Medical Sciences, University Federico II, Via Pansini 5, 80131 Naples, Italy.,
BACKGROUND: This study was designed to assess the impact of obesity and acquisition protocol on (123)I-metaiodobenzylguanidine (MIBG) indexes of cardiac sympathetic innervation. METHODS: Forty-five patients with heart failure (HF) (38 men, age 58+/-15 years) underwent (123)I-MIBG cardiac imaging. Of these patients, 10 were obese [body mass index (BMI) >/=30 kg/m(2)]. Ten-minute planar images of the thorax in anterior view were performed 15 minutes ("early" image) and 3 hours and 50 minutes ("late" image) after tracer administration in both supine- and prone-position. Early and late (123)I-MIBG heart-to-mediastinum (H/M) ratios and washout rate were computed. RESULTS: In overall study population, early and late (123)I-MIBG H/M ratios and washout rate were comparable between supine- and prone-position acquisitions. Obese patients had a lower early and late (123)I-MIBG H/M ratios both in supine (P<0.01) and prone (P<0.05) positions compared to non-obese subjects. CONCLUSIONS: Our results indicate that in HF patients, obesity has a significant impact on (123)I-MIBG indexes of cardiac sympathetic innervation. Prone-position did not change early and late (123)I-MIBG H/M ratios and washout rate compared to supine position both in obese and non-obese HF patients.