fig4

Figure 4. Intraoperative transit-time flow measurement of a left internal thoracic artery graft (LITA) to the left anterior descendent coronary artery (yellow arrow). The x-axis of the graph represents time in seconds and the y-axis represents flow in mL/min. The red box depicts the mean flow through the graft (LITA), which in this case is 28 mL/min. The yellow box depicts the pulsatility index, which in this case is 1.3. The acoustic coupling index (ACI) (black arrow) is 59% (if the background of this number is green, it portrays adequate contact between the probe and the graft for a correct transit-time flow measurement).