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Table 1 Baseline characteristics of the 70 patients with Bismuth IV hilar obstruction

From: CO2 or air cholangiography reduces the risk of post-ERCP cholangitis in patients with Bismuth type IV hilar biliary obstruction

 Contrast agentAirCO2P-values
Study time framesOctober 2013 – February 2015May 2015–June 2016July 2016 – November 2017 
Patients221830 
Age57.74 ± 9.3458.32 ± 13.6658.64 ± 11.520.523
Male-to-Female ratio16:614:419:110.60
Symptoms
 Jaundice22 (100%)18 (100%)30 (100%)> 0.99
 Abdominal pain6 (27.3%)3 (16.7%)4 (13.3%)0.46
 Fever2 (9.1%)4 (22.2%)7 (13.3%)0.391
 Pruritus6 (27.3%)3 (16. 7%)5 (16.7%)0.647
 WBC (×109/L)7.15 ± 2.658.70 ± 3.827.17 ± 3.300.131
Liver function tests
 Serum bilirubin (umol/L)320.39 ± 100.86264.23 ± 82.92252.89 ± 74.940.976
 ALP (median, [Q1, Q3])450.21 (110.35, 609.14)413.97 (125.39, 598.16)501.47 (150.46, 622.16)0.108
 γ-GT (median, [Q1, Q3])350.69 (169.83, 626.72)410.34 (209.83, 598.14)408.91 (217.38, 663.27)0.195