Japanese investigators at Osaka University analyzed data from heart failure patients who underwent iodine-123 metaiodobenzylguanidine (I-123 MIBG) SPECT scans. They found patients with higher levels of blood-flow defects on SPECT scans were significantly more at risk of dying from cardiac events than those with low levels.
SPECT scans identify high-risk heart failure patients https://www.auntminnie.com/index.aspx?sec=sup&sub=mol&pag=dis&ItemID=133789