Intrathecal Analgesia Via a Percutaneous Port For the Management of Movement-Evoked Breakthrough Cancer Pain of Refractory Lower Extremity Cancer Pain: A Retrospective Review and Commentary

Abstract

Background and Objectives: Intrathecal analgesia (ITA) is a trusty treatment option for refractory and intractable cancer pain. However, there is still no general consensus on the analgesic effect of movement-evoked breakthrough pain (MEBTP) in the ITA setting. This study examined the effect of patient-controlled intrathecal analgesia (PCIA) on analgesic efficacy, emphasizing movement evoked breakthrough pain (MEBTP) in patients with refractory lower extremity cancer pain. Methods: A retrospective chart review included all patients with refractory lower extremity cancer pain who received Intrathecal morphine infusion therapy via percutaneous port (IMITPP) at our hospital between January 2017 and December 2020. Data on the numerical pain rating scales (NRS) scores, opioid doses, and complications were collected from medical records prior to IMITPP and at a one-month postimplant visit.Results: A total of 16 patients were included in the study group. Mean SRPI (spontaneous resting pain intensity) decreased from 8.75 pre- IMITPP to 3.75 post- IMITPP, (P < 0.001); mean MEPI (movement-evoked breakthrough pain intensity) fell from 8.83 pre- IMITPP to 4.25 post- IMITPP (P < 0.001); mean daily morphine equivalent dosing decreased from 360 mg/d to 48mg/d (P< 0.001); mean daily morphine equivalent dosing for MEBTP decreased from 87 mg/d to 6 mg/d (P< 0.001). Both total and breakthrough dosing of conventional opioid medications significantly decreased following the initiation of ITT with PCIA. The mean perceived time to onset with conventional movement evoked breakthrough medications was 38 minutes, and the mean perceived time to onset with PCIA was 8 minutes (P < 0.001). Conclusions: IMITPP was associated with improved pain control in patients with refractory lower extremity cancer pain. Compared with conventional MEBTP medication, appropriate PCIA provided superior analgesia and a much faster onset of action.