Comparison of Single-Shot Intrathecal Morphine Injection and Continuous Epidural Bupivacaine for Post-Operative Analgaesia after Elective Abdominal Hysterectomy

Low rate of rescue epidural analgesia after open colorectal surgery with intrathecal morphine: a retrospective cohort study

PURPOSE

The use of intrathecal morphine in open colorectal surgery has been limited despite being a promising analgesic alternative used in other types of open abdominal surgery. Intrathecal morphine has a higher success rate than thoracic epidural analgesia, the current standard method of analgesia in open colorectal surgery. Intrathecal morphine is occasionally used in open colorectal surgery when thoracic epidural analgesia placement fails and in instances when patients receive intrathecal morphine for a planned laparoscopic surgical procedure which is converted to laparotomy intraoperatively. This retrospective single-centre cohort study aimed to evaluate outcomes after intrathecal morphine in patients undergoing open colorectal surgery.

METHODS

All patients who received intrathecal morphine before open colorectal surgery at a secondary hospital in Sweden between 2016 and 2020 were included. Routinely collected data from the Swedish PeriOperative Registry and patients' medical records were reviewed, and data regarding postoperative outcomes including the incidence of postoperative rescue thoracic epidural analgesia and adverse events were extracted.

RESULTS

In total, 108 patients were included with a median age of 74 years. Four patients (4%) received rescue thoracic epidural analgesia postoperatively, and the median hospital length of stay was 8 days. The median intrathecal morphine dose was 200 µg. Respiratory complications occurred in two patients (2%).

CONCLUSION

The incidence of rescue thoracic epidural analgesia after intrathecal morphine in open colorectal surgery was low, and there were few adverse events. The results suggest that intrathecal morphine could be a viable alternative for postoperative pain management in open colorectal surgery.

Effect of Neuraxial Analgesic Procedures on Intraoperative Hemodynamics During Routine Clinical Care of Gynecological and General Surgeries: A Case-Control Query of Electronic Data

Background

The purpose of this study was to determine whether neuraxial analgesic procedures affect intraoperative hemodynamics and/or postoperative outcomes. Previous studies have examined effects in small samples of patients in highly controlled research environments. This study examined “real-world” data from a large sample of subjects receiving routine clinical cares.

Methods

A matched case–control analysis of electronic medical records from a large, academic hospital was performed. Patients who underwent neuraxial procedures preoperatively for postoperative analgesia for abdominal surgery (n=1570) were compared with control patients matched according to age, sex, ASA class and type of surgical procedure. Intraoperative hemodynamic measures, fluids and pressor utilization were quantified. Postoperative outcomes were determined based on the changes in laboratory values, the ordering of imaging studies and admission to an intensive care unit during the seven days following surgery as well as 30-day mortality.

Results

Medical records of 1082 patients who received an epidural catheter placement and 488 patients who received a lumbar intrathecal morphine injection were compared with an equal number of matched control patients. Preoperative placement of an epidural catheter for the management of postoperative pain was demonstrated to be associated with significant reductions in mean arterial pressure intraoperatively and poorer postoperative outcomes (more intensive care unit [ICU] admissions, more myocardial injuries) when compared with controls. A similar analysis of preoperatively administered intrathecal morphine injections was not associated with intraoperative alterations in blood pressure and had improved outcomes (less ICU admissions) in comparison with controls.

Conclusion

In a “real-world” sample, intrathecal morphine administration proved to be highly beneficial as a neuraxial analgesic procedure as it was not associated with intraoperative hypotension and was associated with improved clinical outcomes, in contrast to opposite findings associated with epidural catheter placement. There should be a careful consideration of elective neuraxial method utilized for postoperative pain control, with the present study raising significant concerns related to the use of epidural analgesia and its potential effect on clinical outcomes.