Quantitative assessment of @entity4214 myocardial washout rate: importance of peak heart rate and lung XXXX uptake in defining normal values.

@entity1 @entity296 @entity66 @entity4214 @entity951 @entity453
Traditionally, the results of exercise @entity4214 scintigraphy were interpreted by transient defect analysis using initial and delayed images. Recently, washout rate analysis has been used for the relative quantification of exercise @entity4214 scintigraphy. A diffuse slow washout from all myocardial regions has been defined as the indicator of extensive @entity453 . However, slow washout has occasionally been observed in normal cases and in healthy @entity296 which are not supplied by a stenosed artery in @entity1 with single or @entity66 . We evaluate the factors influencing washout rate in 100 normal @entity1 and 63 @entity1 with @entity951 (33 cases of @entity66 and 30 cases of @entity66 ). The washout rates were calculated using circumferential profile analysis. In normal @entity1 , washout rate was closely related to peak heart rate (r = 0.72) and inversely related to lung @entity4214 uptake (r = -0.56). A diffuse slow washout was observed in seven (7%) of 100 normal @entity1 , six (18%) of 33 cases of @entity66 and eight (24%) of 30 cases of @entity66 . The @entity1 with diffuse slow washout showed significantly higher lung @entity4214 uptake values and lower peak heart rates than those without diffuse slow washout (P less than 0.01). Thus, this false positive slow washout should be considered in the interpretation of quantitative exercise @entity4214 scintigraphy.
