Table 4.
Left ventricular functions by echocardiography in patients with obstructive sleep apnea syndrome.
| AHI 5–14/h | AHI 15–29/h | AHI ≥30/h | P | |
|---|---|---|---|---|
|
| ||||
| N | 7 | 13 | 20 | |
| Left ventricular ejection fraction in two dimensions by Simpson’s method 55–75%a | 67.4 (7.9) | 67.6 (4.9) | 66.1 (5.6) | .514 |
| Early mitral flow velocity (m/sec) | 0.8 (0.1) | 0.7 (0.2) | 0.7 (0.2) | .601 |
| Atrial mitral flow velocity (m/sec) | 0.7 (0.2) | 0.6 (0.2) | 0.7 (0.2) | .481 |
| Ratio of early and atrial mitral flow velocity >1a | 1.2 (0.3) | 1.2 (0.4) | 1.0 (0.3) | .369 |
| Mitral deceleration time, <220# (m/sec)a | 220.6 (46.5) | 224.3 (54.5) | 225.8 (64.0) | .965 |
| Isovolumic relaxation time, <100# (m/sec)a | 75.1 (10.2) | 100.4 (19.7) | 105.0 (19.3) | .002 |
| Myocardial performance index, 0.39 (0.05)a | 0.5 (0.1) | 0.8 (0.2) | 0.8 (0.2) | .001 |
Data presented as mean (SD).
AHI: Apnea-hypopnea index
a
Normal values.