Table 3

Summary of outcomes by year

OutcomeYear
2002
(n=803, 7.1%)
2003
(n=1020, 9.1%)
2004
(n=984, 8.8%)
2005
(n=942, 8.4%)
2006
(n=921, 8.2%)
2007
(n=1124 100.0%)
2008
(n=1997, 17.8%)
2009
(n=1875, 16.7%)
2010
(n=1573, 14.0%)
Total
(n=11 239)
Pvalue
Unadjusted new-onset AF281 (35.0%)334 (32.7%)288 (28.3%)282 (29.9%)251 (27.2%)333 (29.6%)582 (29.1%)549 (29.3%)412 (26.2%)3312 (29.5%)0.006
Adjusted* new-onset AFNA†NA†31.0%33.1%30.1%33.3%35.9%36.0%31.7%33.1%0.139
Number of AF episodes‡§ 1.3±3.40.9±2.30.7±1.80.7±2.30.9±2.40.9±2.40.9±2.60.9±2.40.8±2.40.9±2.40.005
Adjusted* number of AF‡NA†NA†0.4±0.10.5±0.10.5±0.10.7±0.10.8±0.10.7±0.10.6±0.20.6±0.20.005
Time to first AF (hours)¶**55 (52, 58)56 (54, 58)56 (54, 59)53 (51, 56)50 (47, 54)53 (51, 56)53 (50, 55)50 (47, 53)50 (46, 55)52 (50, 56)0.049
Adjusted* time to first AF (hours)¶**NA†N A†59 (56, 63)51 (47, 54)51 (48, 55)54 (51, 57)52 (50, 55)50 (47, 53)50 (45, 55)52 (48, 55)0.007
Duration of first AF  (hours)‡¶7.4±15.17.0±18.98.4±10.99.5±15.89.8±20.79.2±13.88.6±12.68.7±13.37.4±11.68.9±14.50.087
Adjusted* first AF duration (95% CI)NA†NA†7.1 (5.4 to 8.9)7.7 (6.0 to 9.4)8.6 (6.8 to 10.4)7.5 (5.9 to 9.1)6.7 (5.0 to 8.3)7.0 (5.2 to 8.8)3.8 (1.2 to 6.3)7.2 (5.3 to 9.1)0.109
Duration of longest AF (hours)‡¶12.1±22.511.3±15.812.1±18.011.7±20.016.3±25.214.3±19.712.7±20.512.5±18.111.9±16.612.7±19.50.031
Adjusted* longest AF (95% CI)NA†NA†11.5 (9.0 to 14.1)12.5 (10.0 to 15.0)15.9 (13.3 to 18.5)14.0 (11.8 to 16.3)12.6 (10.2 to 14.9)12.8 (10.2 to 15.3)9.2 (5.6 to 12.8)13.1 (10.4 to 15.9)0.035
Total AF duration  (hours)¶**22 (18, 26)21 (18,23)20 (17, 24)22 (19, 26)25 (22, 30)23 (20, 27)22 (19, 25)21 (17, 24)18 (14, 24)21 (18, 25)0.250
Adjusted total AF duration (hours)¶**NA†NA†20 (16, 27)23 (18, 28)26 (22, 30)23 (20, 27)21 (18, 25)21 (17, 24)18 (14, 24)22 (18, 26)0.320
Operative mortality20 (2.5%)19 (1.9%)31 (3.2%)15 (1.6%)16 (1.7%)10 (0.9%)30 (1.5%)24 (1.3%)20 (1.3%)185 (1.7%)0.002
Adjusted* operative mortalityNA†NA†2.5%1.6%1.2%1.2%1.6%2.1%1.4%1.7%0.156
Stroke19 (2.4%)11 (1.1%)17 (1.6%)15 (1.5%)17 (1.5%)14 (1.5%)30 (1.5%)29 (1.6%)22 (1.4%)174 (1.6%)0.704
Adjusted* strokeNA†NA†1.7%1.8%1.6%1.7%2.0%2.0%1.7%1.8%0.965
Discharge in unresolved AF6 (0.8%)7 (0.7%)7 (0.7%)7 (0.7%)12 (1.3%)13 (1.2%)20 (1.0%)16 (0.9%)6 (0.4%)94 (0.8%)0.340
Adjusted* discharge unresolved AFNA†NA†0.6%0.8%1.2%1.0%0.8%0.9%0.3%0.8%0.347
Length of stay (LOS)(days)**7 (6, 10)7 (6, 10)7 (5, 10)7 (6, 10)7 (5, 9)7 (5, 10)7 (5, 10)7 (5, 10)7 (5, 9)7 (5, 10)0.082
Adjusted LOS**NA†NA†8.3 (7.8, 8.8)8.9 (8.5, 9.3)8.6 (8.3, 9.0)9.2 (8.9, 9.5)9.1 (8.8, 9.4)8.5 (8.1, 8.9)8.5 (8.2, 8.9)8.8 (8.4, 8.4)0.035
  • *Adjusted by STS risk of mortality and time of operation.

  • †STS risk score was not available for this year.

  • ‡Mean±SD.

  • §Calculated including all 11 239 study subjects.

  • ¶Calculated for the 3312 subjects with at least one AF event.

  • **Median (IQR), log-transformed.

  • AF, atrial fibrillation (defined as any documented event detected via continuous in-hospital ECG/telemetry monitoring, regardless of duration); STS, Society of Thoracic Surgeons.