Table 2.
Results from 26 nights of respiratory polygraphy in hospitalized patients with acutely decompensated heart failure and stratified by overnight troponin T change (increase vs. decrease)
| All nights | Troponin T increase.a | Troponin T decrease.a | |
|---|---|---|---|
| Test result | (n = 26) | (n = 11) | (n = 15) |
| AHI.b (events/h), median (IQR) | 21.6 (35.3) | 44.6 (36.3) | 14.9 (19.6) |
| CAI.c (events/h), median (IQR) | 3.0 (22.5) | 22.7 (36.2) | 0.6 (9.0) |
| T90.d (%), median (IQR) | 34.0 (51.0) | 44.0 (36.0) | 23.0 (83.0) |
| ODI.e (events/h), mean (SD) | 24.8 (18.0) | 30.9 (18.4) | 20.4 (17.0) |
| CSR present, n (%) | 12 (46) | 5 (45) | 7 (47) |
| SDB type.f, n (%) | |||
| Central | 8 (31) | 6 (55) | 2(13) |
| Obstructive | 18 (69) | 5 (45) | 13(87) |
AHI apnea–hypopnea index, CAI central apnea index, CSR Cheyne-Stokes respirations, ODI oxygen desaturation index, SDB sleep disordered breathing.
aRefers to overnight troponin change (increase vs. decrease)
bAHI4% (4% desaturation is required for events to be classified as apnea)
cCentral apneas per hour of valid signal time during respiratory polygraphy
dPercentage of valid signal time with an oxygen saturation < 90%
eDesaturation events ≥ 4% per hour of valid signal time
fPredominant respiratory event type (central vs. obstructive) determined by comparing the AHI and CAI (methods)