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Usefulness of 5 Minutes 123I-mIBG Scan in Parkinson’s Disease and Heart Failure

Author(s):

Viviana Frantellizzi*, Maria Ricci, Alessio Farcomeni, Mariano Pontico, Arianna Pani and Giuseppe De Vincentis   Pages 1 - 10 ( 10 )

Abstract:


Background: The use of 123I-mIBG has been approved for decades for Parkinson’s disease (PD) diagnosis and as a predictor of mortality and potentially fatal events in patients with Heart Failure (HF). The standardized technique includes an early acquisition (15 minutes from injection), and a late acquisition (240 minutes) Early images mainly represent interstitial uptake, whereas delayed images represent actual neuronal uptake, however, it is reasonable to affirm that different pathological situations, such as PD and HF, imply a different meaning for early and late imaging.

Objective: This prospective study aims to investigate the clinical usefulness of an immediate planar 123I-mIBG image acquisition (5 minutes) both in patients with PD and in patients with HF.

Methods: 115 patients referred to 123I-mIBG cardiac imaging in Nuclear Medicine Center have been enrolled (60 patients with PD, absence of diabetes and/or cardiologic pathology, Hoehn e Yahr classification ≤ 1.5; 55 patients with cardiomyopathy, diagnosis of HF, NYHA class I–III). 123I-mIBG planar anterior thoracic acquisitions were performed after 5 (immediate), 15 (early) and 240 (late) minutes from injection and H/M ratios were calculated.

Results: In PD group H/M mean values resulted 1.58±0.22 for immediate (5 min), 1.61±0.26 for early (15 min) and 1.59±0.37 for late (240 min) acquisitions. In the HF group H/M mean values resulted 1.63±0.24 for immediate (5 min), 1.65±0.22 for early (15 min) and 1.57±0.17 for late (240 min) acquisitions respectively. H/M values obtained at 5 min and 15 min are provided similar results, with no statistical difference (p = ns) regardless of the pathology examined (PD or HF groups). The statistical analyses validated the diagnostic role of immediate acquisition (5 min) and early acquisition (15 min) in PD group as compared to the standardized late acquisition (240 min). On the opposite, in HF group immediate and early acquisition, as compared to late acquisition (240 min), resulted not validated as an MCE major cardiac events predictor.

Conclusion: Our results indicate the potential role of immediate (5 min) or early (15 min) acquisition in replacement of standardized 240 minutes acquisition in PD patients, but this result is not confirmed in HF patients, in which the acquisition at 240 min is confirmed as the most affordable timing for image interpretation, emphasizing the different pathophysiology that underlies these two pathologies.

Keywords:

123 I-mIBG imaging, Parkinson’s disease, Heart failure, Cardiac sympathetic activity, Acquisition technique, Acquisition timing

Affiliation:

Department of Molecular Medicine, Sapienza, “Sapienza” University of Rome, Viale Regina Elena,324, 00161 Rome, Department of Radiological Sciences, Oncology and Anatomical Pathology, Sapienza, “Sapienza” University of Rome, Viale Regina Elena,324, 00161 Rome, Department of Radiological Sciences, Oncology and Anatomical Pathology, Sapienza, “Sapienza” University of Rome, Viale Regina Elena,324, 00161 Rome, , Ph.D. Program in Morphogenesis & Tissue Engineering, Sapienza University of Rome, Rome, Postgraduate School of Clinical Pharmacology and Toxicology, University of Milan “Statale”, Department of Radiological Sciences, Oncology and Anatomical Pathology, Sapienza, “Sapienza” University of Rome, Viale Regina Elena,324, 00161 Rome



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