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Prolactin response to the severity of surgical insult.

Prolactin levels are elevated significantly during the recovery process from surgical insult, implying a role for prolactin in the neuroendocrine immune network. This study examined the importance of severity of surgical insult to the prolactin response. Two groups of surgical patients were chosen consecutively and studied prospectively. Seven patients scheduled for "clean" elective surgery, i.e., herniorrhaphy and laparoscopic cholecystectomy, were compared with seven patients scheduled for prolonged abdominal exploration. Blood was drawn for prolactin and cortisol at 8:00 AM on the day of surgery and on postoperative days one, three, and five. Using a two-tailed test, preoperative prolactin levels and levels on postoperative days three and five were significantly different in the prolonged surgery group (.012 and .002, respectively). There were no statistically significant differences in preoperative and postoperative prolactin levels in the clean surgery group. Cortisol levels were not significantly elevated in either group. These results indicate that the prolactin response to surgery is related to the severity of the surgical insult.