Nomogram to predict intervention after high-grade renal trauma

Nomogram for the regression model predicting bleeding interventions after HGRT.
How to read the nomogram: For HRD, take the size of hematoma in centimeters and draw a vertical line to the red bar labeled Points in the box to get the points. Then, sum the points of the HRD with the other five variables using the point values in the parentheses for each variable. Take the sum of the points and make a dot on the Total Points bar below the box on the nomogram. Connect this dot from the Total Points bar to the bottommost bar to obtain the predicted probability of undergoing bleeding interventions.
Example 1: A patient is presented to the emergency department with a normal and stable blood pressure (ie, no hypotension/shock during the first 4 hours of admission; 0 points) and with isolated high-grade renal injury (ie, no concomitant injuries; 0 points) after a knife injury (penetrating injury; 34 points) to the left kidney; in the initial trauma CT scan, there is a 3 cm (HRD, 3 cm; 25 points) hematoma confined to the perirenal space (no pararenal; 0 points) without active VCE (no VCE, 0 points). Total points are 59 (0 + 0 + 34 + 25 + 0 + 0) corresponding to an intervention probability of less than 10%.
Example 2: A patient is transferred to the emergency department in shock (16 points) after high-speed motor vehicle accident (blunt injury; 0 points). After initial fluid resuscitation and hemodynamic stabilization, the patient undergoes trauma CT scan, which shows liver and splenic lacerations without active bleeding (concomitant injuries; 16.5 points) and multiple deep lacerations in the right kidney with VCE from renal vessels (VCE; 29 points) and a 9 cm hematoma (HRD, 9 cm; 75 points) extending inferiorly into the pelvis (pararenal extension; 20 points). Total points are 156.5 (16 + 0 + 16.5 + 29 + 75 + 20) corresponding to an intervention probability of approximately 90%, suggesting that it is highly likely that the patient would need early angiography with or without angioembolization or an open intervention.