• Sebastiano Mercadante, Claudio Adile, Francesco Masedu, Marco Valenti, and Federica Aielli.
• Main Regional Center for Pain Relief and Supportive/Palliative Care, La Maddalena Cancer Center, Palermo, Italy. Electronic address: 03sebelle@gmail.com.
• J Pain Symptom Manage. 2019 May 1; 57 (5): 966-970.

ObjectiveThe objective of this study was to assess the characteristics of breakthrough cancer pain (BTcP) in patients with abdominal cancer pain, and the eventual factors associated with its presentation.MethodsPatients with abdominal visceral cancer presenting BTcP were included in the analysis. Pain intensity, current analgesic therapy, number of BTcP episodes, intensity of BTcP, its predictability and triggers, onset (≤10 minutes or >10 minutes), duration, interference with daily activities, medications and doses currently used for BTcP, and time to meaningful pain relief were collected. Adverse effects imputable to a BTcP medication were recorded.ResultsFour hundred fourteen patients were included in the study. The mean background pain was 2.7 (SD 1.19) and most patients (97.6%) were receiving opioids. The mean number of BTcP episodes/day was 2.2 (SD 1.51). The mean intensity of BTcP was 7.3 (SD 1.32). BTcP onset was ≤10 minutes and >10 minutes in 271 (65.5%) and 143 patients (35.5%), respectively, and the mean duration was 52.6 minutes (SD 38.1). Interference of BTcP with daily activity was relevant for 340 patients (82%). In 122 patients (29.5%), BTcP was predictable and ingestion of food (n = 63, 51.6%) was the most frequent trigger. In comparison with unpredictable BTcP, postprandial BTcP had a lower intensity (P = 0.039), had a faster onset (P = 0.042), and was associated with the use of oxycodone/naloxone (P = 0.003), and less use of nonsteroidal anti-inflammatory drugs (P = 0.006).ConclusionPatients with abdominal visceral BTcP represent a subgroup with specific features of BTcP, particularly those with predictable BTcP. Ingestion of food was the prominent trigger for BTcP, having a faster onset and a lower intensity. This group of patients more frequently used oxycodone/naloxone or no anti-inflammatory drugs. These findings suggest consequential therapeutic decisions.Copyright © 2019 American Academy of Hospice and Palliative Medicine. Published by Elsevier Inc. All rights reserved.

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