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Table 3 Transit-time flowmetry parameters before and after administration of protamine: single grafts with pre- and post-protamine TTFM with ACI > 30 (both pre- and post-protamine) and same MAP range (for each graft)

From: Transit time flow measurement of coronary bypass grafts before and after protamine administration

  N all grafts N arterial grafts N venous grafts All Arterial grafts Venous grafts
Pre-protamine Post-protamine p value Pre-protamine Post-protamine p value Pre-protamine Post-protamine p value
MGF 559 318 241 29 (17–44) 30 (18–48) 0.009 28 (17–43) 28 (17–44) 0.44 30 (18–46) 32 (20–52) 0.001
PI 559 318 241 2.3 (1.8–3.2) 2.2 (1.7–2.9) <  0.001 2.2 (1.8–3.0) 2.2 (1.7–2.9) 0.02 2.4 (1.7–3.5) 2.1 (1.6–2.9) <  0.001
DF 489 289 200 68 (60–73) 66 (58–73) <  0.001 71 (65–76) 70 (63–75) <  0.001 61 (56–69) 60 (54–66) 0.18
BF 552 315 237 0.8 (0–3.0) 0.9 (0–3.0) 0.81 0.9 (0–3.9) 1.1 (0.2–3.7) 0.78 0.4 (0–2.3) 0.5 (0–2.2) 0.96
  1. Data reported as median (25th percentile-75th percentile)
  2. BF Backflow, DF Diastolic fraction, MAP Mean arterial pressure, MGF Mean graft flow, PI Pulsatility index, ONCAB On-pump coronary artery bypass, OPCAB Off-pump coronary artery bypass