[Identification of viable myocardium by 201Tl scintigraphy: a comparison of methods].
The present study was undertaken to compare four different imaging approaches to evaluate uptake defect reversibility. 24 infarcted patients underwent standard stress/redistribution 201Tl imaging (R1). Then, after reinjection of 37 MBq of 201Tl, patients were re-imaged either after 15 min (R2) 24 h later (R3). A separate rest study (R4) following a new tracer injection was done within 2-3 days. Planar images were obtained in the standard three views and subdivided into 216 segments for qualitative analysis based on a visual score. A semiquantitative analysis based upon circumferential profiles was also applied. A stress defect was found in 127 segments (58.7%). By visual inspection reperfusion was considered to occur in 32.3%, 41.7%, 33.0% and 49.6% of the cases with R1, R2, R3, and R4, respectively. The semiquantitative method showed a high reperfusion only with R1 (62%), while the other procedures proved less effective. No improvement was found with R4. Six patients (25%) showed myocardial viability that was not detected with the early reinjection technique.
Servizio di Medicina Nucleare, Osp. degli Infermi Faenza, Bologna.
M
M
Dondi
F
F
Tartagni
L
L
Osele
S
S
Fanti
N
N
Monetti
P
P
Antonioli
I
I
De Tommaso
R
R
Franchi
M R
MR
di Niro
B
B
Magnani
D005260:Female; D006801:Humans; D007267:Injections; D008297:Male; D009203:Myocardial Infarction / Q000000981:diagnostic imaging*; D009206:Myocardium / Q000473:pathology*; D011877:Radionuclide Imaging; D013794:Thallium Radioisotopes / Q000008:administration & dosage
D013794:Thallium Radioisotopes