Jose Rivers

Intrapartum epidural analgesia and maternal temperature regulation.

OBJECTIVE: To examine maternal temperature changes after epidural analgesia. METHODS: A prospective cohort of nulliparas at term was monitored with hourly maternal tympanic temperatures after epidural analgesia (n=99). Temperature response after epidural analgesia was examined in the group as a whole. Subsequently, mean maternal temperature curves were compared between women who remained afebrile throughout labor (n=77) and women who developed intrapartum fever with body temperature greater than 100.4ºF (n=22). Baseline maternal characteristics were assessed. RESULTS: Women who later developed intrapartum fever had a higher mean temperature within 1 hour after epidural analgesia. In contrast, women who remained afebrile had no increase in core temperature. During the first 4 hours after epidural analgesia initiation, women who later develop intrapartum fever have an increase in mean tympanic temperature of 0.33ºF per hour. CONCLUSION: Epidural analgesia is not associated with increased temperature in the majority of women. Hyperthermia is an abnormal response confined to a minority subset, which occurs immediately after exposure. Our findings do not support a universal perturbation of maternal thermoregulation after epidural analgesia. LEVEL OF EVIDENCE: II

Prophylactic Acetaminophen Does Not Prevent Epidural Fever in Nulliparous Women: A Double-Blind Placebo-Controlled Trial

OBJECTIVE: Epidural analgesia is associated with a four- to five- fold increase in noninfectious maternal fever in nulliparous women. Fever prophylaxis may safely reduce both unnecessary neonatal sepsis evaluations and the potential effect of fever on the fetus.STUDY DESIGN: We performed a randomized double-blind placebo-controlled study. Immediately after epidural placement, full-term nulliparas with a temperature of <99.5°F received acetaminophen 650 mg or placebo, per rectum, every 4 hours. Tympanic membrane temperatures were measured hourly. Our power to detect an effect of acetaminophen treatment on maternal temperature over time was 90%.RESULTS: In all, 21 subjects were randomized to each arm. Treatment with acetaminophen did not impact maternal temperature curves. Fever >100.4°F was identical in the acetaminophen and placebo groups (23.8%, p=1.0). Neonatal surveillance blood cultures did not reveal occult infection.CONCLUSIONS: Acetaminophen prophylaxis prevented neither maternal hyperthermia nor fever secondary to epidural analgesia, suggesting that the mechanism underlying fever does not include centrally mediated perturbations of maternal thermoregulation.

Randomized, controlled trial comparing the effects of anesthesia with propofol, isoflurane, desflurane and sevoflurane on pain after laparoscopic cholecystectomy

BACKGROUND Pain is the primary complaint and the main reason for prolonged recovery after laparoscopic cholecystectomy. The authors hypothesized that patients undergoing laparoscopic cholecystectomy will have less pain four hours after surgery when receiving maintenance of anesthesia with propofol when compared to isoflurane, desflurane, or sevoflurane. METHODS In this prospective, randomized trial, 80 patients scheduled for laparoscopic cholecystectomy were assigned to propofol, isoflurane, desflurane, or sevoflurane for the maintenance of anesthesia. Our primary outcome was pain measured on the numeric analog scale four hours after surgery. We also recorded intraoperative use of opioids as well as analgesic consumption during the first 24h after surgery. RESULTS There was no statistically significant difference in pain scores four hours after surgery (p=0.72). There were also no statistically significant differences in pain scores between treatment groups during the 24h after surgery (p=0.45). Intraoperative use of fentanyl and morphine did not vary significantly among the groups (p=0.21 and 0.24, respectively). There were no differences in total morphine and hydrocodone/APAP use during the first 24h (p=0.61 and 0.53, respectively). CONCLUSION Patients receiving maintenance of general anesthesia with propofol do not have less pain after laparoscopic cholecystectomy when compared to isoflurane, desflurane, or sevoflurane.

Perforated Crohn's disease presenting during pregnancy

Severe exacerbations of Crohns disease (CD) requiring acute surgery are rare, and rarer still are those that occur during pregnancy. We present a case of perforated CD in an obstetric patient. A 24-year-old woman at 27 weeks gestation, with abdominal pain, leucocytosis and concern for preterm labour, presented to our institution. MRI was obtained and demonstrated a phlegmon in the small bowel mesentery near the distal ileum, with concern for perforation. The patient was taken for an emergent exploratory laparotomy. Intraoperatively, an ileal perforation with small bowel fistula was observed and an ileocolectomy with primary anastomosis was performed. Pathology of the resection revealed CD, a new diagnosis for the patient. She was ultimately discharged on postoperative day 13 and later went on to deliver a healthy term infant, and, 5 years later, has had no significant recurrence.