Safe use of opioids to manage pain in patients with cirrhosis

Oral oxycodone/naloxone for pain control in cirrhosis: Observational study in patients with symptomatic metastatic hepatocellular carcinoma

BACKGROUND & AIMS

Pain management in cirrhosis is a clinical challenge. Most analgesics are metabolized in the liver and cirrhosis may deeply alter their concentration, favouring the appearance of side effects. We aimed to assess the efficacy and safety of oral prolonged-release association of oxycodone/naloxone tablets (OXN) in the treatment of moderate/severe cancer pain in cirrhotic patients with metastatic hepatocellular carcinoma (HCC).

METHODS

We enrolled n = 32 HCC patients with moderate/severe cancer pain unresponsive to paracetamol alone or associated with codeine or tramadol. All patients received an initial OXN dose of 5 mg bid to be gradually increased in case of insufficient analgesia. At baseline and follow-up visits, we evaluated: pain intensity (using the Numerical Rating Scale, NRS), patients' autonomy in daily activities (Barthel Functioning Index); bowel dysfunction (Bowel Function Index, BFI), signs of hepatic encephalopathy (HE) and other opioid-induced side effects.

RESULTS

No clinically significant adverse effects were reported (median follow-up 122 days). No significant worsening of the BFI score was noted and no cases of HE were detected. Two patients (6.3%) discontinued treatment before T14 because of mild nausea and dizziness. The remaining n = 30 patients were assessed for efficacy. Treatment led to a significant reduction in the mean of pain scores both at T14 (-37.1 ± 16.3%, P < .001) and at T28 (-55.6 ± 21.5%, P < .001); Barthel scores showed gradual and significant increase from T0 (81.6 ± 13.0) to T14 (86.5 ± 11.4, P = .001) and to T28 (88.3 ± 13.6, P = .009).

CONCLUSIONS

OXN may be considered a safe and effective option in the fragile population of cirrhotic patients.

Opioid Drugs in Patients With Liver Disease: A Systematic Review

CONTEXT

The liver, one of the most important organs of the body, is known to be responsible for several functions. The functional contribution of the liver to the metabolism of carbohydrates, protein, drugs and toxins, fats and cholesterol and many other biological processes are still unknown. Liver disorders are classified into two types: acute and chronic. Different drugs are used in liver diseases to treat and control pain. Most pain relief medications such as opioids are metabolized via the liver; therefore, the adverse reactions of drugs are probably higher for patients with liver disease. The current study aimed to evaluate the effects of opioid drugs on patients with liver disease; therefore, it is necessary to select suitable opioids for such patients.

EVIDENCE ACQUISITION

This review was written by referring to research literature including 70 articles and four textbooks published from 1958 to 2015 on various reputable sites. Searches were carried out on the key phrases of narcotic pain relievers (opioids), acute and chronic hepatic failure, opioid adverse drug reactions, drug-induced liver injury (DILI) and other similar keywords. References included a variety of research papers (descriptive and analytical), intervention and review articles.

RESULTS

In patients with liver disease, administration of opioid analgesics should be observed, accurately. As a general rule, lower doses of drugs should be administered at regular intervals based on the signs of drug accumulation. Secondly, the interactions of opioid drugs with different levels of substrates of the P450 cytochrome enzyme should be considered.

CONCLUSIONS

Pain management in patients with liver dysfunction is always challenging to physicians because of the adverse reactions of drugs, especially opioids. Opioids should be used cautiously since they can cause sedation, constipation and sudden encephalopathy effects. Since the clearance of these drugs in patients with hepatic insufficiency is decreased, the initial dose must be decreased, the intervals between doses should be increased and some patients need to be continuously assessed.

Chronic pain among liver transplant candidates

CONTEXT

Little systematic research has been conducted to understand pain among persons with end-stage liver disease, especially among liver transplant candidates. Appropriate pain assessment and management are important areas of consideration as treatment options are limited.

OBJECTIVE

To describe the nature of chronic pain in patients with end-stage liver disease, the extent to which pain affects daily level of functioning, and the variety and effectiveness of current treatments.

DESIGN

Retrospective chart review.

SETTING

Academic medical center in the Southeastern United States.

PATIENTS

Data were collected from 108 consecutive adult liver transplant candidates.

RESULTS

Most (77%) reported having experienced moderate levels of bodily pain within the past 24 hours. Patients with only alcoholic cirrhosis reported less pain than patients with cirrhosis due to other causes (alcoholism and hepatitis C, nonalcoholic steatohepatitis, only hepatitis C). Pain interfered significantly across all 10 functional domains assessed. Although 90% reported being prescribed a variety of analgesic agents (most commonly short-acting opioids), patients reported experiencing only 33% pain relief.

CONCLUSIONS

Pain is a significant problem among liver transplant candidates, and current pain treatments are perceived to be relatively ineffective. Increased understanding is needed to safely and effectively evaluate and treat such medically complicated patients.