Constipation is one of the most common problems in patients receiving palliative care and can cause extreme suffering and discomfort. The aims of this study are to raise awareness of constipation in palliative care, provide clear, practical guidance on management and encourage further research in the area. A pan-European working group of physicians and nurses with significant experience in the management of constipation in palliative care met to evaluate the published evidence and produce these clinical practice recommendations. Four potentially relevant publications were identified, highlighting a lack of clear, practical guidance on the assessment, diagnosis and management of constipation in palliative care patients. Given the limited data available, our recommendations are based on expert clinical opinion, relevant research findings from other settings and best practice from the countries represented. Palliative care patients are at a high risk of constipation, and while general principles of prevention should be followed, pharmacological treatment is often necessary. The combination of a softener and stimulant laxative is generally recommended, and the choice of laxatives should be made on an individual basis. The current evidence base is poor and further research is required on many aspects of the assessment, diagnosis and management of constipation in palliative care.
Sedative dose increases in the last hours of life were not associated with shortened survival overall, suggesting that the doctrine of double effect rarely has to be invoked to excuse sedative prescribing in end-stage care.
The frequency of the use of laxatives, and the relationship between doses of laxatives and of opioid analgesia, were determined by a prospective study of 498 hospice inpatients with advanced cancer. Laxatives were required by 87% of patients taking oral strong opioids, 74% of those on weak opioids and 64% of those not receiving opioid analgesia. The form of the relationship appears to be hyperbolic, as suggested by the presentation of the results arranged by opioid quartile and by the improved correlation obtained by subjecting the opioid data to a logarithmic transformation. It is concluded that opioids account for about a quarter of the constipation found in terminally ill cancer patients in a hospice. However, the dose of laxative required is likely to be significantly higher if an opioid is being taken than if not. The form of the relationship between laxative and strong opioid doses is what might be expected from the mediation of opioid-induced constipation by opioid receptors.
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