Table 2

Diagnostic coronary angiography and echocardiography findings

CharacteristicsSleep apnoea
(n=513)
Non-sleep apnoea
(n=494)
P value
Coronary angiography
Clinical presentation, n (%)0.22
 ST–segment elevation myocardial infarction60 (11.7)49 (9.6)
 Non–ST–segment elevation myocardial infarction205 (40.1)185 (36.1)
 Unstable angina94 (18.4)103 (20.1)
 Stable angina129 (25.2)143 (27.9)
 Other23 (4.5)13 (2.5)
Number of diseased coronary vessels, n (%)0.27
 120 (3.9)14 (2.8)
 256 (10.9)68 (13.8)
 3437 (85.2)412 (83.4)
Left main artery stenosis ≥50%155 (30.4)157 (31.8)0.63
Proximal left anterior descending artery stenosis ≥50%379 (74.8)368 (74.8)0.99
SYNTAX score, median (IQR)33 (26–41)33 (26–41)0.92
Echocardiography
Left ventricular ejection fraction, median (IQR), %50 (37–60)55 (45–60)<0.0001
Left ventricular ejection fraction, n (%)<0.0001
 >50%223 (48.0)264 (61.1)
 30%–50%158 (34.0)120 (27.8)
 <30%84 (18.1)48 (11.1)
Left atrium diameter, median (IQR), mm41 (37–45)38 (35–42)<0.0001
Left ventricular end–diastolic internal diameter, median (IQR), mm52 (47–57)49 (45–54)<0.0001
Left ventricular end–systolic internal diameter, median (IQR), mm36 (31–44)33 (29–39)<0.0001
Left ventricular mass index, median (IQR), g/m2 108 (89–132)98 (82–123)<0.0001
Aortic root diameter, median (IQR), mm33 (30–36)32 (30–35)0.011
E/A, median (IQR)0.87 (0.67–1.32)0.86 (0.70–1.20)0.41
Pulmonary artery systolic pressure, median (IQR), mm Hg30 (25–39)29 (24–34)0.016
  • Data were missing from the categories of clinical presentation (n=3), left main stenosis (n=3) and left anterior descending artery stenosis (n=8). Preoperative echocardiography data were available in 897 of 1007 patients.