Intrathecal morphine for pelvic and sacral pain caused by cancer

WITHDRAWN: Comparative efficacy of epidural, subarachnoid, and intracerebroventricular opioids in patients with pain due to cancer

2013: This review is now being updated by a new author team. The publication of the protocol is expected in late 2013.

October 2015: after discussion with the authors and PaPaS editors, the decision was made to halt the development of the protocol that was being planned to replace and update this review. It was felt that the review question was no longer a priority.

The editorial group responsible for this previously published document have withdrawn it from publication.

Spinal opioids in adult patients with cancer pain: a systematic review: a European Palliative Care Research Collaborative (EPCRC) opioid guidelines project

BACKGROUND

A systematic review, undertaken according to an initiative to revise European Association for Palliative Care guidelines on the use of opioids for cancer pain, which aimed to analyse analgesic efficacy and side effects of spinal opioids in adult cancer patients previously treated with systemic opioids.

METHODS

Search strategy elaborated with MeSH terms and words related to cancer, palliative care, pain, spinal route and opioids. PubMed, Embase and Cochrane assessed in Nov 2009. Studies were analysed and classified according to quality of evidence and strength of recommendation.

RESULTS

Out of 2939 abstracts, 44 articles were selected (nine randomized controlled trials (RCTs), two non-randomized cohort studies, 28 uncontrolled prospective studies, and five case series). Relief of pain and/or side effects were reported in 42 articles; however, there were few studies of high quality design (RCTs) and these studies had methodological limitations that reduced their quality of evidence to very low.

CONCLUSION

There are few RCTs and these are of very low quality. As a result, they provide weak recommendation for using spinal opioids in adult cancer patients. Further studies are clearly needed.

Comparative efficacy of epidural, subarachnoid, and intracerebroventricular opioids in patients with pain due to cancer

BACKGROUND

Since the 1970s, when endogenous opioids and opioid receptors were first isolated in the central nervous system, attempts have been made to optimize opioid therapy by delivering the medication centrally rather than systemically. Although the vast majority of cancer patients obtain satisfactory pain relief from individualized systemic treatment, there remain the few whose pain is refractory to systemic treatments. These patients may obtain relief from neuraxial opioid therapy: intracerebroventricular, epidural or subarachnoid.

OBJECTIVES

To compare intracerebroventricular therapy with other neuraxial treatments and to determine whether intracerebroventricular (ICV) has anything to offer over epidural (EPI) and subarachnoid (SA) catheters in terms of efficacy, adverse effects, and complications.

SEARCH STRATEGY

A number of electronic databases were searched to retrieve information for inclusion in this review. Non-English language reports are awaiting assessment. Unpublished data were not sought.

SELECTION CRITERIA

Randomised studies of intracerebroventricular therapy for patients with intractable cancer pain were sought. However, this level of evidence was not available so data from uncontrolled trials, retrospective case series and uncontrolled prospective cohort studies were assessed.

DATA COLLECTION AND ANALYSIS

Our search did not retrieve any controlled trials. We therefore used data from uncontrolled studies to compare incidences of analgesic efficacy, adverse effects, and complications. We found 72 uncontrolled trials assessing ICV (13 trials, 337 patients), EPI (31 trials, 1343 patients), and SA (28 trials, 722 patients) in cancer patients. From these we extracted data on analgesic efficacy, common pharmacologic adverse effects, and complications.

MAIN RESULTS

Data from uncontrolled studies reported excellent pain relief among 73% of ICV patients compared with 72% EPI and 62% SA. Unsatisfactory pain relief was low in all treatment groups. Persistent nausea, persistent and transient urinary retention, transient pruritus, and constipation occurred more frequently with EPI and SA. Respiratory depression, sedation and confusion were most common with ICV. The incidence of major infection when pumps were used with EPI and SA was zero. There was a lower incidence of other complications with ICV therapy than with EPI or SA.

AUTHORS' CONCLUSIONS

Neuraxial opioid therapy is often effective for treating cancer pain that has not been adequately controlled by systemic treatment. However, long-term use of neuraxial therapy can be complicated by problems associated with the catheters. The data from uncontrolled studies suggests that ICV is at least as effective against pain as other neuraxial treatments and may be a successful treatment for patients whose cancer pain is resistant to other treatments.

Epidural and intrathecal analgesia for cancer pain

The three-step analgesic ladder approach developed by the World Health Organization works well in treating the vast majority (70-90%) of patients suffering from pain related to cancer. In those patients who do not get pain relief by this three-step approach, intraspinal agents can be a fourth step in managing pain of malignant origin. Although morphine is the only opioid approved by the US Food and Drug Administration for intraspinal use, many different opioid analgesics are used intraspinally, including hydromorphone, fentanyl, sufentanil, meperidine and methadone in the treatment of cancer pain. Many non-opioid agents have also been used intraspinally either alone or in combination with opioids in the treatment of intractable cancer pain. This chapter summarizes the clinical use of these agents with some practical points.

Evidence-based review of the literature on intrathecal delivery of pain medication

Evidence-based medicine depends on the existence of controlled clinical trials that establish the safety and efficacy of specific therapeutic techniques. Many interventions in clinical practice have achieved widespread acceptance despite little evidence to support them in the scientific literature; the critical appraisal of these interventions based on accumulating experience is a goal of medicine. To clarify the current state of knowledge concerning the use of various drugs for intraspinal infusion in pain management, an expert panel conducted a thorough review of the published literature. The exhaustive review included 5 different groups of compounds, with morphine and bupivacaine yielding the most citations in the literature. The need for additional large published controlled studies was highlighted by this review, especially for promising agents that have been shown to be safe and efficacious in recent clinical studies.

Intrathecal morphine delivered via subcutaneous pump for intractable pain in pancreatic cancer

BACKGROUND

Pain secondary to unresectable pancreatic cancer is frequently severe and extremely difficult to control with traditional methods of analgesia. This retrospective study reports the analgesic effects of intrathecal morphine sulfate by implanted infusion pumps in nine patients with unresectable adenocarcinoma of the pancreas.

METHODS

Nine patients were implanted over a 2-year period. Preoperative morphine i.v. equivalents were a mean of 81.51 mg/day, with a range of 20-140 mg/day. Patients were hospitalized for a trial dose of 1-2 mg of intrathecal Duramorph, 1 mg/ml, via lumbar puncture to assess whether adequate pain relief could be achieved and whether there would be drug-related side effects.

RESULTS

All patients who received a trial dose experienced excellent pain relief, and subsequently underwent implantation of a lumbar subarachnoid catheter and infusion pump during the same hospitalization. The mean number of days from diagnosis to pump implant was 119, with a range of 3-587 days. The mean maximum daily dose was 21.28 mg, with a range of 3-73.10 mg. No patient experienced respiratory depression or excess sedation which prevented achievement of pain control. Minor supplemental narcotic use was documented in three of the nine patients. Assessment of pain control was made by the level of activity and the analog pain scale, with 0 being no pain and 10 being the worst pain imaginable. All of the patients experienced good to excellent relief of pain. The mean duration of intrathecal morphine sulfate use until death was 137.3 days, with a range of 52-354 days.

CONCLUSIONS

This series of nine patients indicates that long-term administration of intrathecal morphine via implanted infusion pump in patients with pancreatic cancer is both efficacious and safe. All patients and their families reported an improved quality of life with an increased level of activity.

Response of intractable pain to continuous intrathecal morphine: a retrospective study

We have treated 37 patients with intractable pain (35 with cancer-related pain) by continuous intrathecal morphine infusion via implanted pump. These patients were carefully selected according to specific criteria, and each demonstrated a significant reduction in pain following a test dose of intrathecal morphine. All patients had good pain relief from intrathecal morphine infusion, even with pain located in cervical dermatomes. Systemic narcotics could be withdrawn from most patients. Significant side effects were rare and typically self-limited. Many patients required gradually increasing doses, seemingly related to disease progression. Two patients with non-malignant pain have had variable dose requirements over 28 and 44 months without clear tolerance. In these patients we observed a reduction in side effects associated with systemic opioids when continuous intrathecal opioid infusion was instituted. Intrathecal opioid administration may have fewer complications than ablative pain relief procedures. In properly selected patients, this method offers an effective alternative for pain relief.

Long-term pain relief produced by intrathecal morphine infusion in 53 patients

The present report details the characteristics of the analgesic effects of morphine administered chronically by infusion pumps implanted in 53 patients suffering from terminal metastatic disease. The median postimplant survival time in these patients was 4 months. Patients (mean age 58 years) were characterized according to the duration of pain before pump implantation (mean 16 months), prior consumption of systemic opioids (mean one to six daily analgesic equivalents of morphine), and their response to a trial intrathecal dose of morphine (1 to 2 mg). The median infusion dose at 2 weeks was 3.8 mg/day. The analgesic index, calculated as (quality of pain relief x duration of pain relief in hours)/morphine dose in mg, that was observed after the trial dose of morphine was determined for each patient. A close correlation was observed between the acute (2-week) infusion dose necessary to produce pain relief and the analgesic index such that the infusion dose = -8.0 x log (analgesic index) + 17.1. By 16 weeks, the mean spinal morphine dose for the group had increased by a factor of about 2.5; however, significant variation in the dose incrementation was documented. The maximum increase was observed in patients with a low analgesic index, and this rapid incrementation was usually correlated with an unsatisfactory overall outcome. Evidence that long-term infusion continues to yield analgesia was evidenced in six cases where there was an unanticipated loss of drug infusion and a corresponding increase in parenteral narcotic consumption. These data indicate the long-term efficacy and safety of spinal opioid infusion in patients with terminal cancer, and emphasize the advantage of assessing the sensitivity of the patient to spinal opioids by a standardized trial injection prior to pump placement as a prognostic indication of outcome.

Thoracic epidural morphine in the palliation of chest wall pain secondary to relapsing polychondritis

Relapsing polychondritis is a rare disease of unknown etiology characterized pathologically by degeneration of the chondrocyte and replacement with fibrous connective tissue. The following case report presents the pain management of a 34-yr-old man suffering from intractable pain secondary to relapsing polychondritis. Systemic narcotic analgesics, adjunctive drugs, and peripheral nerve blocks with local anesthetic and steroid failed to adequately control the patient's pain. Thoracic epidural morphine was used to provide excellent relief of pain. Factors in the selection of an implantable narcotic delivery system as well as practical considerations including tolerance and potential side effects of intraspinal narcotics are discussed. Ethical issues surrounding the chronic use of intraspinal narcotics in the setting of chronic benign pain are also discussed.

Intraspinal opiates for treatment of intractable pain in the terminally ill cancer patient

The discovery of opiate receptors and then their endogenous ligands in 1974 (Snyder et al., 1974) has elucidated a vast pharmacology of opiates providing a basis for their diverse clinical applications. With the awareness of quality of life as a primary goal in terminal cancer patients, widespread attention has been drawn to the direct delivery of long-term intraspinal analgesics to cancer patients for who all medical pain control regimens have failed (Coombs & Saunders, 1974). Intraspinal administration of opiates and nonopiate analgesics is not only appealing on theoretical grounds but provides a minimally invasive method to insure otherwise unobtainable pain relief while eliminating obtundation and systemic side-effects associated with conventional therapy (Cobb et al., 1984; Harbaugh et al., 1982; Leavens et al., 1982; Malone et al., 1985; Onofrie et al., 1981; Poletti et al., 1981). Although intraspinal opiates have been used in the treatment of postoperative and benign-pain syndromes (Asari et al., 1981; Cousins & Mather, 1984), in our discussion we review the basic science, current techniques and possible future improvements in spinal analgesia in the control of chronic cancer pain.

A new permanent exteriorized epidural catheter for narcotic self-administration to control cancer pain

The lack of an available exteriorized permanent epidural catheter led to the application of the Broviac catheter technology to the development of an epidural catheter. The resulting three-piece silicone-rubber catheter system allows specific spinal-level location of the catheter tip from a lumbar entry site, and exteriorization for ease of self-administration. Fifty-five cancer patients with metastatic disease and intractable pain received 58 catheters. No catheter infections were found during 3891 catheter-days of use, and only 18 minor side effects were noted, with no respiratory depression observed. Hospitalizations for pain control was decreased by 90% after catheter placement. Therefore, the authors recommend early placement of this silicone-rubber epidural catheter to control pain unrelieved by oral analgesics.