Opioid-Induced Constipation in Patients with Cancer Pain in Japan (OIC-J Study): A Post Hoc Analysis

Opioid-induced constipation (OIC) can limit the clinical benefit of opioid treatment. This post-hoc analysis evaluated the association between the Rome IV diagnostic criteria and other measures for OIC, including the Bowel Function Index (BFI), correlation between demographics and OIC onset, impact of OIC on pain treatment, and impact of patient–healthcare professional (HCP) communication on patient satisfaction. Patients recorded bowel habits in paper diaries for 14 days following opioid initiation. Study-specific questionnaires were used to evaluate patient awareness of OIC and satisfaction. Patients were ≥20 years old, initiating strong opioid therapy for cancer pain, had an ECOG PS ≤ 2, and had no constipation (≥3 bowel movements within 7 days of enrollment). A total of 220 patients were enrolled. The sensitivity and specificity of BFI for identifying OIC were 81.2% and 54.7%, respectively. Age <65 versus ≥65 years (odds ratio (OR) = 0.510, 95% confidence interval (CI): 0.267–0.977) and the presence or absence of comorbidities (OR = 0.443, 95% CI: 0.221–0.885) were correlated with OIC onset. The proportion of inpatients with sustainable pain control at week 2 was similar in patients with or without OIC (60.0% vs. 67.2%, respectively). By patient assessment, there was a significant correlation between an adequate level of patient–HCP communication and satisfaction with OIC treatment (OR = 9.538 (95% CI: 1.577–57.681)). Using BFI to screen for OIC represents a valid approach in patients with cancer pain. Patient–HCP communication is essential for effective management of OIC in patients with cancer pain.

The prevalence of constipation at admission and after 1 week of palliative care: a multi-center study

AIM

To assess the prevalence and intensity of constipation in advanced-cancer patients referred to palliative care, and to assess changes after 1 week of specialist palliative care.

METHODS

This was a prospective multi-center study in advanced patients for a period of 1 year. At admission (T0), age, gender, primary tumor, concomitant diseases, Karnofsky status, Palliative prognostic score (PaP), Edmonton Symptom Assessment scale (ESAS), Memorial Delirium Assessment Scale (MDAS), and bowel function index (BFI) were collected. In BFI, high values represent severe constipation. The use of medication was also recorded, as well as possible causes of constipation. The same parameters were recorded 1 week after admission for palliative care (T7).

RESULTS

A total of 246 patients were screened for constipation. The mean BFI at T0 was 42.4 (SD = 26.92). One hundred and sixty-three patients (66.3%) had a BFI >28. The mean BFI at T7 was 35.7 (SD = 28.8), with a significant decrease from T0 to T7 (p = .000). A significant decrease of BFI in patients with a BFI >28 was reported (p = .000). In patients with a BFI ≤28 there was a significant worsening of constipation (p = .000). In patients with a BFI >28 at T0 there was a significant increase in the use of laxatives at T7 in comparison with patients having a BFI ≤28 (p = .002). In patients with a BFI ≤28 at T0, who had a significant worsening of BFI (Δ > 12), the use of laxatives was significantly lower in comparison to patients who had a BFI >28 (p = .000). In the multivariate analysis, dehydration and the use of benzodiazepines were independently associated with higher BFI scores.

CONCLUSION

Constipation is present in approximately two-thirds of patients, and is principally associated with dehydration and the use of benzodiazepines. Patients with normal bowel function at initial assessment may see a worsening in their condition a week later due to lack of prevention or subsequent under-treatment.