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Table 2 Statistically significant differences between those diagnosed with Covid-19 pre-surgery compared to those diagnosed post-operatively. All definitions as per NACSA and ICNARC datasets

From: Cardiac surgery outcome during the COVID-19 pandemic: a retrospective review of the early experience in nine UK centres

Variable Covid-19 positive pre-surgery Frequency (%)/mean ± SD or Median[IQR] (n = 17) Covid-19 positive post-surgery Frequency (%)/mean ± SD or Median[IQR] (n = 35) p (Covid-19 positive vs Covid-19 negative)
Demographics
 Age (years/median [IQR]) 60 [45–65] 70 [57–74] 0.029
 Female gender 2 (11.8) 2 (5.7) 0.589
 Ethnicity
  White 8 (80.0) 22 (95.7) 0.212
  Asian 0 (0.0) 0 (0.0)  
  Black 2 (20.0) 1 (4.4)  
  Other 0 (0.0) 0 (0.0)  
Cardiac risk factors
 BMI (kg/m2/median [IQR]) 25.6 [24.7–28.3] 27.4 [25–33] 0.084
Examination and investigation
 Pre-op heart rhythm
  Sinus rhythm 16 (94.1) 28 (80.0) 0.030
  Atrial fibrillation/flutter 0 (0.0) 7 (20.0)  
  Complete heart block/pacing 1 (5.9) 0 (0.0)  
  Ventricular fibrillation/tachycardia 0 (0.0) 0 (0.0)  
  Other abnormal rhythm 0 (0.0) 0 (0.0)  
Pre-operative risk assessment
 EuroSCORE (median [IQR]) 2.8 [1.6–6.4] 4.9 [2.5–6.5] 0.400
Intra-operative details
 Aortic cross clamp time (minutes) 72 [45–84] 92 [75–139] 0.017
Outcome
 Number of days ventilated 1 [1–2] 2 [1–5] 0.017
 Post-operative length of stay (days) 7 [5–11] 12 [7–21] 0.024
 In-hospital mortality 0 (0) 13 (37.1) 0.005