Patients who received NP were more likely to be non-whites (P < 0.0001), ASA III-IV (P = 0.011), to have experienced congestive heart failure (P = 0.046) and to have used preoperative steroids (P = 0.006) compared to those who received MBP alone, ABP alone, or MBP + ABP. Here, MBP is linked to congestive heart failure.