Table 2.
Comparisons among scintigraphic data of patients affected by ET, ETRBD+, and ETRBD−.
| Variables | All ET group (N = 55) | ETRBD+ group (N = 10) | ET RBD– group (N = 45) | p-valuea |
|---|---|---|---|---|
| DAT-SPECT IMAGING* | ||||
| Putamen R/Occ ratio | 4.41 ± 0.61 | 4.64 ± 0.45 | 4.36 ± 0.6 | 0.12a |
| Putamen L/Occ ratio | 4.38 ± 0.62 | 4.62 ± 0.60 | 4.34 ± 0.61 | 0.20a |
| CARDIAC MIBG SCINTIGRAPHY** | ||||
| Heart/Mediastinum ratio early image | 1.72 ± 0.25 | 1.81 ± 0.3 | 1.70 ± 0.24 | 0.28a |
| Heart/Mediastinum ratio delayed image | 1.73 ± 0.28 | 1.84 ± 0.33 | 1.69 ± 0.25 | 0.21a |
ETRBD+ group, Essential tremor (ET) patients with Rem sleep behavior disorder (RBD); ETRBD−, ET patients without RBD; DAT-SPECT, Dopamine transporter ligand (DAT)-Single photon emission computerized tomography (SPECT); Putamen/Occ ratio [Putamen specific (Left/Right) to non-specific (occipital) area]; MIBG, Cardiac I-123 Metaiodobenzylguanidine (MIBG) scintigraphy;
*
Normal values: Put/Cau right (mean ± SD, 4.29 ± 0.34) and Put/Cau left (mean ± SD, 4.19 ± 0.39).
**
Normal values: Heart/Mediastinum ratio: mean ± SD, 1.94 ± 0.18 early; 2.02 ± 0.19 delayed.
a
Two-sample t-test. P-values are calculated ETRBD+ group vs. ETRBD− group.