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Table 3 Main variables in Propensity-matched Patients

From: A comparison of heparinised and non-heparinised normal saline solutions for maintaining the patency of arterial pressure measurement cannulae after heart surgery

Variable NS group (n = 148) Heparin group (n = 148) P value
Duration of AC (hours) 58.3 ± 31.4 62.1 ± 41.4 0.4
Manipulations
 Mobilization (n, %) 12, 8.1% 7, 4.7% 0.2
 Flushing(n, %) 148, 100% 148, 100%
 Number of flushing (times) 33.7 ± 8.8 32.1 ± 7.8 0.1
 Both manipulation (times) 8, 5.4% 4, 2.7% 0.2
Reasons for removal
 AC occlusion (n, %) 5, 3.4% 3, 2.0% 0.5
 Discharge from ICU (n, %) 148, 100% 145, 98.0% 0.1
 Patient’s death (n, %) 0 1, 0.7% 0.3
 HIT (n, %) 0 3, 2.0% 0.1
Condition of the AC at removal
 Patency (n, %) 148, 100% 146, 98.6% 0.2
 Reliability of AP (n, %) 148, 100% 146, 98.6% 0.2
 Acceptable waveform (n, %) 148, 100% 146, 98.6% 0.2
Cannulae size    0.2
 20 G, diameter: 1.1 mm (n, %) 82, 55.4% 71, 48.0%  
 22 G, diameter: 0.9 mm (n, %) 44, 29.7% 49, 33.1%  
 24 G, diameter: 0.7 mm (n, %) 22, 14.9% 28, 18.9%  
ICU stay time (hours) 60.3 ± 37.8 62.2 ± 43.1 0.6
Deep venous thrombosis (n, %) 9, 6.1% 5, 3.4% 0.3
  1. Median (Interquartile Range), NS: Normal Saline, ICU: Intensive Care Unit, AP: Arterial Pressure, Mean ± SD, AC: Arterial catheter, HIT: Heparin-Induced Thrombocytopenia