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Methylnaltrexon

Ein neuer Ansatz zur Therapie der opioidinduzierten Obstipation

Methylnaltrexone

A new approach for therapy of opioid-induced obstipation

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Zusammenfassung

Schmerzpatienten unter Therapie mit Opioiden leiden häufig an einer ihr Wohlbefinden sehr beeinträchtigenden Obstipation. Eine entsprechende opioidinduzierte Obstipation kann als gastrointestinale Komplikation regelmäßig auch in der Palliativmedizin sowie bei analgosedierten Patienten auf Intensivstation oder während prolongierter perioperativer Schmerztherapie auftreten. Unbehagen und Unwohlsein bei den betroffenen Patienten sind zum Teil so stark ausgeprägt, dass lieber vermehrt Schmerzen in Kauf genommen werden, als diese Nebenwirkung der Therapie mit Opioiden zu ertragen. Konventionelle Therapieansätze sind vielfach nicht in der Lage diese Obstipation zufriedenstellend zu behandeln: Die opioidinduzierte Darmträgheit ist vielmehr sehr resistent gegenüber den üblichen Laxanzien. Zudem schwindet die Obstipation nicht mit zunehmender Dauer der Therapie, wie dies mit anderen Nebenwirkungen der Opioide der Fall ist. Es ist gut belegt, dass die opioidinduzierte Obstipation über eine Aktivierung von µ-Opioidrezeptoren im Magen-Darm-Trakt vermittelt wird. Selektiv periphere µ-Rezeptorantagonisten (wie Methylnaltrexoniumbromid, Relistor®) können somit eine opioidinduzierte Obstipation effizient therapieren. Eine Interferenz mit der zentralen Analgesie findet dabei nicht statt, da die Blut-Hirn-Schranke aufgrund des Ladungszustandes der Moleküle nicht passiert wird. Eine verringerte Effizienz der Therapie mit Opioiden oder die Entstehung von Entzugssymptomen können hierdurch vermieden werden. Studien haben zudem gezeigt, dass Methylnaltrexon nicht nur sicher und effektiv bei chronisch obstipierten Patienten in der Palliativmedizin eingesetzt werden kann, es bietet auch weitere vielversprechende therapeutische Optionen für zusätzliche Patientengruppen.

Abstract

Chronic pain patients using opioids frequently suffer from constipation which compromises well-being. Such an opioid-induced gastro-intestinal complication can occur regularly in patients in palliative care as well as in analgesic sedated intensive care patients or during prolonged perioperative pain therapy. Discomfort and distress in the affected patients can be so severely pronounced that they would rather suffer from the pain than from the side effect of constipation. Conventional therapy can be insufficient in providing satisfactory relief of constipation, mostly because this opioid-induced bowel hypomotility can be laxative-resistant. Moreover, constipation does not decrease during the course of therapy as do other side effects. It is well known that opioid-induced constipation is mediated via activation of µ-opioid receptors in the gastrointestinal tract. Selective peripheral µ-receptor antagonists (such as methylnaltrexone, Relistor®) can effectively treat opioid-induced constipation. An interference with central analgesia does not occur as the molecules cannot pass the blood-brain barrier due to their charged states. A reduction of opioid therapy or the development of withdrawal symptoms can be avoided. Studies have shown that methylnaltrexone is not only safe and efficient for chronically constipated palliative care patients but offers promising therapeutic options for further patient collectives.

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Der korrespondierende Autor weist auf folgende Beziehung hin: Mit Unterstützung der Wyeth Pharma GmbH.

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Chappell, D., Conzen, P. Methylnaltrexon. Schmerz 23, 471–478 (2009). https://doi.org/10.1007/s00482-009-0824-3

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