Table 2.
Polysomnographic findings in the cohort with a comparison of subjects with vs. without a clinical history of RBD.
| Entire sample (n = 65) |
RBD by history (n = 38) |
No RBD by history (n = 27) |
p-value | |
|---|---|---|---|---|
| Mean total sleep time in minutes (SD) | 316.3 (70.2) | 311.7 (58.6) | 322.8 (84.4) | 0.40 |
| Median AHI (range)a | 8 (0–89) | 8.85 (0–89) | 7.6 (0.9–48.8) | 0.59 |
| Median REM time (range) | 36.0 (2.5–145.5) | 32.8 (2.5–125) | 37.5 (10–145.5) | 0.66 |
| Median REM as percentage of total sleep time (range) | 10.4 (1.2–34.5) | 7.9 (1.2–21.8) | 14.6 (3.9–34.5) | 0.21 |
| Number of REM periods, N (%) | ||||
| 1 | 22 (33.8) | 16 (42.1) | 6 (22.2) | 0.10 |
| 2 | 22 (33.8) | 12 (31.6) | 10 (37.0) | |
| 3 | 13 (20.0) | 6 (15.8) | 7 (25.9) | |
| 4 or 5 | 8 (12.3) | 4 (10.5) | 4 (14.8) | |
| Median REM latency in minutes (range) | 175.5 (52.5–419.0) | 184.5 (52.5–419) | 162.5 (54.5–379.5) | 0.15 |
| Median apnea-hypopnea index (SD; range) | 8 (0–89) | 8.85 (0–89.0) | 7.6 (0.9–48.8) | 0.60 |
| Median periodic limb movement index in NREM (range) | 0 (0–79.9) | 0 (0–45.8) | 0 (0–79.9) | 0.50 |
| Median periodic limb movement index in REM (range) | 0 (0–3.1) | 0 (0–3.1) | 0 (0–0.5) | 0.40 |
| Presence of RSWA by AASM criteria, N (%) | 43 (66.2) | 31 (81.6) | 12 (44.4) | 0.002 |
| Mean number of mini-epochs with RSWA (phasic activity) in (SD; range): | ||||
| mentalis | 7.6 (8.5; 0–42.5) | 10.2 (0.3; 0–42.5) | 4.1 (5.8; 0–27.5) | 0.003 |
| right arm | 7.0 (8.3; 0–45.2) | 9.8 (9.2; 0–45.2) | 3.2 (4.7; 0–21.4) | <0.001 |
| left arm | 7.1 (7.3; 0–34.9) | 9.9 (7.6; 0–34.9) | 3.2 (4.6; 0–21.7) | <0.001 |
| right leg | 7.9 (9.2; 0–51.8) | 9.14 (8.5; 0–35.4) | 6.1 (10.0; 0–51.8) | 0.030 |
| left leg | 9.0 (9.41; 0–41.0) | 10.7 (9.6; 0.2–39.5) | 6.5 (8.7; 0–41.0) | 0.011 |
| mentalis + all limbs | 25.4 (18.2; 1.3–88.0) | 31.8 (15.6; 5.3–68.3) | 16.3 (18.1; 1.3–88.0) | <0.001 |
| all limbs (excluding mentalis) | 20.7 (16.0; 0.9–82.0) | 25.7 (14.0; 4.7–65.2) | 13.6 (16.3; 0.9–82.9) | <0.001 |
a
Two patients with known, treated obstructive sleep apnea were included. Polysomnogram was performed while the patients were receiving continuous positive airway pressure. One patient had a clinical history of dream enactment and had evidence of RSWA on polysomnogram. The other had no clinical history of dream enactment and did not have evidence of RSWA on polysomnogram.