ABC | Volume 114, Nº2, February 2020

Update Update of the Brazilian Guideline on Nuclear Cardiology – 2020 Arq Bras Cardiol. 2020; 114(2):325-429 Figure 2 – Linear association between intravenous dose per gram of myocardium and blood flow per minute, using the radiopharmaceuticals 201 Tl and MIBI- 99m Tc. Once coronary flow exceeds 2.5 ml.min.g -1 , a loss of linear relationship is observed (phenomenon of “roll off”). Source: Adapted from Berman DS. 116 % dose per gram of tissue MIBI - 99m TC 201 Tl Coronary flow ml.min.g −1 Figure 1 – Hibernation represented as persistent decrease of blood flow and contractile function. Recovery of function is immediate following restoration of coronary flow. %: percent values; NLS: normals. Source: Adapted from Dilszian. 277 HIBERNATING MYOCARDIUM REGIONAL FUNCTION REGIONAL FLOW % NLS VALUES HYPO-PERFUSION MAINTAINED NORMALIZATION OF FLOW 336