Retrospective Chart Review Evaluating Efficacy and Tolerability of Ketamine Continuous Infusion for Cancer-Related Pain.

Sustained reduction of discharge opioid prescriptions in an enhanced recovery after thoracic surgery program: A multilevel generalized linear model

ABSTRACTOpioids are first-line therapy for cancer-related pain. In addition, corticosteroids are commonly utilized as adjuvant analgesics for pain and other symptoms in the oncology setting with limited supporting data. A retrospective analysis was conducted evaluating adult hospitalized patients receiving opioids who received once-daily dexamethasone on the recommendation of a specialty palliative care team during their hospitalization from January 1, 2015, to January 1, 2016. Primary end point was to describe prescribing patterns of dexamethasone in this patient population and secondarily examining any effect on oral morphine equivalent daily dose (MEDD), numeric pain score (NPS), and unwanted effects at 24 and 48 hours after the first dose of dexamethasone. Fifty-nine patients received an average dose of 13 mg (SD = 10) of dexamethasone for cancer-related pain, primarily acute pain (n = 36, 61%). Many died before hospital discharge or soon thereafter (n = 28, 47.5%). Although not statistically significant, our study shows a decrease of 23% and 19% in MEDD and NPS, respectively, without change in WBC after dexamethasone. A specialty palliative care team most often used once-daily dexamethasone for cancer-related pain in patients near the end of life. There were trends toward lower MEDD and NPS, but more robust studies are needed for validation.

Background: Pelvic pain around the time of mensturation without any identifiable pathologic lesion present from menarche is called primary dysmenorrhea. The pain is believed to be related to prostaglandin (PG). Women with dysmenorrhoea have a relatively high concentration of PGF 2 alpha in menstrual fluid and suppression of PG synthesis has become the main treatment. Aim: To compare mean reduction in pain in patients presenting with primary dysmenorrhea given vitamin E & Mefenamic acid versus Mefenamic acid alone. Results: It was a randomized controlled trial which was conducted in Department of Obstetrics & Gynecology, THQ Raiwind Hospital, Lahore for 6 months duration w.e.f 01/02/2017 to 31/07/2017. In this study, 18(36%) in Vitamin-E group and 21(42%) in Mefenamic acid group were between 15-20 years while 32(64%) in Vitamin-E group and 29(58%) in Mefenamic acid group were between 21-25 years, mean±sd was calculated as 20.86±2.92 and 20.66±2.86 years respectively, mean dysmenorrheal pain at baseline was recorded as 50.06±10.27 in Vitamin-E group and 50.14±10.28 in Mefenamic acid group, p value < 0.754, showing that both groups are insignificant, mean dysmenorrheal pain after treatment was recorded as 20.50±10.04 in Vitamin-E group and 30.22±10.28 in Mefenamic acid group, p value was < 0.002 showing significant difference between the two group, comparison of mean reduction in dysmenorrheal pain after treatment was recorded as 20.56±0.91 in Vitamin-E group and 10.92±0.75 in Mefenamic acid group, p value was < 0.000, showing significant difference. Conclusion: We concluded that there is a significant mean reduction in dysmenorrhic pain in patients given Mefenamic Acid + Vitamen E as compared to patients given Mefenamic Acid alone. Keywords: Dysmenorrhic pain, Mefenamic Acid + Vitamen E, mean reduction in dysmenorrhic pain

Opioids are commonly used in cancer pain management. The present study aimed to investigate the occurrence of endocrine dysfunction in patients with cancer pain treated with opioids. The study included 20 patients with cancer-associated pain. All data were obtained from malignant tumors diagnosed and followed up at the Oncology Clinic of Akdeniz University Hospital (Akdeniz, Turkey) between May 2009 and December 2013. Serum samples were collected to determine the levels of hypophyseal, gonadal and thyroid hormones. The inclusion criteria for the study were as follows: Chronic cancer pain, daily treatment with a morphine equivalent daily dose (MEDD) of ≥25 mg/dl for ≥1 month, and a visual analog score of <2. All independent predictors were evaluated using logistic regression analysis. The results did not demonstrate any significant association between MEDD and gender, or the levels of adrenocorticotropic hormone, cortisol, prolactin, thyroid-stimulating hormone, free thyroxine, follicle-stimulating hormone and luteinizing hormone. However, the levels of testosterone (P=0.040) and of free testosterone (P=0.041) were significantly affected by the MEDD. Conversely, prolactin levels were demonstrated to significantly increase with MEDD (P=0.083). The results also indicated that the required opioid analgesic dose and MEDD were significantly affected by age (P≤0.001). Opioid therapy in patients with cancer may inhibit gonadal function and cause hyperprolactinemia.

164 Background: Cancer pain is initially treated with intermediate strength analgesics such as hydrocodone and subsequently escalated to stronger opioids. There are no studies on the process of opioid rotation (OR) from hydrocodone to strong opioids in cancer patients. Our aim was to determine the conversion ratio (CR) for OR from hydrocodone to morphine equivalent daily dose (MEDD) in cancer outpatients. Methods: We reviewed records of 3,144 consecutive patient visits at our Supportive Care Center in 2011-12 for OR from hydrocodone to stronger opioids. Data regarding demographics, Edmonton Symptom Assessment Scale (ESAS), and MEDD were collected in patients who returned for follow up within 6 weeks. Linear regression analysis was used to estimate the CR between hydrocodone and MEDD. Successful OR was defined as 2-point or 30% reduction in the pain score and continuation of the new opioid at follow up. Results: 170/3,144 patients underwent OR from hydrocodone to stronger opioid. 72% were white, 56% male, and 81% had advanced cancer. The median time between OR and follow up was 21 days. 53% had a successful OR with significant improvement in the ESAS pain and symptom distress scores. In 100 patients with complete OR and no worsening of pain at follow up, the median CR (Q1-Q3) from hydrocodone to MEDD was 1.5 (0.9-2) and hydrocodone dose to MEDD correlation was.52 (P&lt;0.0001). The correlation of CR with hydrocodone dose was -0.52 (P&lt;0.0001). The median CR of hydrocodone to MEDD was 2 in patients receiving &lt; 40mg of hydrocodone/day and 1 in patients receiving ≥ 40mg of hydrocodone/day (P&lt;0.0001). The median conversion ratio of hydrocodone to morphine was 1.5 (n=44) and hydrocodone to oxycodone was 0.9 (n=24). Conclusions: Hydrocodone is 1.5-fold stronger than Morphine. The median conversion ratio from hydrocodone to MEDD varied according to hydrocodone dose/day. [Table: see text]

The Opioid Rotation Ratio From Transdermal Fentanyl to “Strong” Opioids in Patients With Cancer Pain

Uncontrolled cancer pain (CP) may impair quality of life. Given the multidimensional nature of CP, its poor control is often attributed to poor assessment and classification. To determine the characteristics and associations of pain intensity in a specialist CP clinic. Consecutive patients referred to the CP clinic of the Portuguese Cancer Institute (Lisbon, Portugal) had standardized initial assessments and status documentation of the following: Brief Pain Inventory ratings for 'pain now' as the outcome variable; initial pain intensity (iPI) on a 0 to 10 scale; pain mechanism (using the Douleur Neuropathique 4 tool to assess neuropathic pain); episodic pain; Eastern Cooperative Oncology Group rating; oral morphine equivalent daily dose (MEDD); Hospital Anxiety Depression Scale and Emotional Thermometer scores; and cancer diagnosis, metastases, treatment and pain duration. Univariable analyses were conducted to test the association of independent variables with iPI. Variables with P<0.1 were entered into a multivariable regression model, using backward elimination and a cut-point of P=0.2 for final model selection. Of 371 participants, 285 (77%) had moderate (4 to 6) or severe (7 to 10) iPI. The initial median MEDD was relatively low (30 mg [range 20&nbsp;mg to 60 mg]). In the multivariable model, higher income, Eastern Cooperative Oncology Group rating 3 to 4, cancer diagnosis (head and neck, genitourinary and gastrointestinal), adjuvant use and initial MEDD were associated with iPI (P<0.05). The model's R2 was 18.6, which explained only 19% of iPI variance. The diversity of factors associated with pain intensity and their limited explanation of its variance underscore the biopsychosocial complexity of CP. Adequacy of CP management warrants further exploration.

Methadone has been reported to be as effective as morphine for cancer pain management. It is commonly used as an alternative opioid in case of insufficient relief. Our aim was to assess efficacy and tolerance of opioid rotation to methadone for refractory cancer pain management in palliative care unit (PCU) inpatients. All the patients undergoing opioid rotation to methadone from 2008 to 2011 in two PCUs (Lyon and Nice, France) were included. Pain assessments were undertaken on day 0 (D0), day 3 (D3), day 7 (D7), and day 14 (D14) using a visual analogue scale (VAS; 0-10) and the Douleur Neuropathique 4 (DN4) scale for neuropathic pain. Patients reported pain relief using a 4-point Likert scale (1=no relief; 4=important relief ). Nineteen patients (7 females) with a median age of 55 (Q1-Q3; 44-58) underwent methadone rotation. The most common type of cancer was gastrointestinal. Seventeen patients had a diagnosis of mixed pain syndromes. Morphine equivalent daily dose (MEDD) prior to switching was 480 mg (Q1-Q3; 100-1021), and at least two nonmethadone opioid rotations had already been done for 13 patients. Between D0 and D7, the VAS score decreased by 4 points (p<0.001). The DN4 score became negative on D7 for 11 of 17 patients (65%). On D7, 16 of 18 patients (89%) expressed moderate to greater than moderate pain relief. Methadone was discontinued in one patient on D7 because it was deemed ineffective and for 8 patients, who were unable to take oral drugs, it was discontinued after D14. Our results suggest that methadone is effective and well tolerated for refractory cancer pain.

e24139 Background: The ketamine is used to control refractory cancer pain as adjuvant to opioids. However, usefulness of ketamine has not yet been confirmed due to lack of previous studies. Additionally, most of prior studies were studied in heterogenous patients, and continuous intravenous infusion (CIVI) method was rare. The CIVI method using gradual dose titrations of ketamine is safe. So, it is suitable to terminally ill cancer patients who have available IV access but vulnerable to AEs. This phase II single-arm study investigated efficacy and safety of CIVI of Ketamine in these population. Methods: Cancer patients with expected limited survival time within several months and refractory cancer pain were enrolled. Refractory cancer pain indicates requirements of breakthrough analgesics ≥ 4 times/day or average pain score &gt; personalized pain goal (PPG) in spite of intravenous Morphine Equivalent Daily Dose (MEDD) &gt; 120 mg/day. The CIVI of ketamine was increased from 0.05 mg/kg/hr to 0.5 mg/kg/hr by 0.05 mg/kg/hr every 8hr when average pain score exceeded PPG or breakthrough was needed ≥ 2 times/8hr during 5 days. The primary end-point was overall pain response rate, which indicates complete response (both breakthrough ≤ 3/day and NRS ≤ PPG) plus partial response (breakthrough ≤ 3/day), without unacceptable toxicities. A total of 26 patients are needed to verify assumption of response rate of 40% with width of 0.4 for two-sided 95% CI and assuming 5% drop-out rate. This study was prematurely terminated at enrollment of 21 patients. Results: Among 21 enrolled patients between SEP 2019 and JAN 2023, 20 were analyzed except 1 due to early transfer. Most pain mechanisms were mixed type (n = 15, 75%), while some reported nociceptive pain (n = 3, 15%) or neuropathic pain (n = 2, 10%). The baseline background opioids were MEDD 186 mg/day (range, 124-592), number of breakthrough opioids were 5 (IQR, 5-7). The median PPG were 4 (range, 3-6). After application of ketamine, overall pain response rate was 45% (n = 9), complete pain response was 35% (n = 7) and partial pain response was 10% (n = 2). The other 11 were non-responders (six failed to achieve overall pain response despite of maximal dose or completing 5 days of ketamine, five patients discontinued the treatment due to AEs). AEs included confusion (n = 9, 45%), dizziness (n = 3, 15%), and hypertension (n = 2, 10%). Communication capacities were sustained in 10 patients and decreased in other 10 patients. OS were 21 days (95% CI, 18.1-23.9). Conclusions: Our study showed efficacies and safeties of gradually increasing CIVI of ketamine for terminally ill cancer patients with refractory cancer pain. The CIVI of ketamine can be a useful tool in these patients considering limited treatment options. Further studies comparing usefulness of CIVI of ketamine and usual practice with opioids escalation are needed (NCT03362073). Clinical trial information: NCT03362073 .

Assessing Risk for Drug Overdose in a National Cohort: Role for Both Daily and Total Opioid Dose?

Please confirm that an ethics committee approval has been applied for or granted: Yes: I’m uploading the Ethics Committee Approval as a PDF file with this abstract submissionBackground and AimsIntrathecal...

Cancer pain: other: Correlation of splanchnic nerve block efficacy and cancer staging

180 Background: There is no standardized and universally accepted pain classification system for the assessment and management of cancer pain in both clinical practice and in research studies. The Edmonton Classification System for Cancer Pain (ECS-CP) is an assessment tool that has demonstrated value in assessing pain characteristics and response. The purpose of the study was to determine the relationship between the negative ECS-CP features and some pain related variables like pain intensity and opioid use. Also, we explored whether the number of negative ECS-CP features was associated with higher pain intensity. Methods: Electronic charts of 100 patients at the outpatient supportive care clinic in a comprehensive cancer center were reviewed for patient characteristics, initial ECS-CP assessment, the morphine equivalent daily dose (MEDD), opioid rotation, the Edmonton Symptom Assessment Score (ESAS), Memorial Delirium Assessment Scale (MDAS), performance status, and the use of adjuvant analgesics. Results: Ninety one out of the 100 charts were therefore eligible for analysis. The median age was 58.4 years. The most common primary cancer site was gastrointestinal cancer (22.1%). The median pain intensity was 6 and the median MEDD was 45mg. Incident pain was the most common ECS-CP feature (60%) and cognitive dysfunction was the least frequent feature (2%). Neuropathic pain was associated with higher median pain intensity (7 vs. 5, p=0.007) and median MEDD requirement (83 vs. 30, p=0.013). Psychological distress was associated with higher median pain intensity (7 vs. 5, p=0.042). Incident pain was also associated with a trend for higher pain intensity (6 vs 5, p= 0.06). A higher number of negative ECS-CP features was associated with higher pain intensity (p=0.01). Conclusions: The ECS-CP was successfully completed in the majority of patients, demonstrating its utility in routine clinical practice. Neuropathic pain and psychological distress were associated with higher pain intensity. Also, neuropathic pain was associated with higher MEDD. A higher sum of negative ECS-CP features was associated with higher pain intensity. Further studies will be needed to explore this observation.

181 Background: Cancer patients frequently undergo opioid rotation (OR) for uncontrolled pain or opioid induced neurotoxicity. TDF is one of the most common opioids prescribed to cancer patients. However, the accurate ORR from other opioids to TDF is unknown and various currently used methods result in a wide variation of ORRs. Our aim was to determine the ORR of morphine equivalent daily dose (MEDD) to TDF when correcting for MEDD of breakthrough opioids (net MEDD) in cancer outpatients. Methods: We reviewed records of 22,532 consecutive patient visits at our Supportive Care Center in 2010-13 for OR from to TDF by a palliative medicine specialist. Data regarding Edmonton Symptom Assessment Scale (ESAS) and MEDD were collected in patients who returned for follow up within 5 weeks. Linear regression analysis was used to estimate the ORR between TDF dose and net MEDD (MEDD prior to OR minus MEDD of breakthrough opioid used along with TDF after OR). Successful OR was defined as 2-point or 30% reduction in pain score and continuation of the new opioid at follow up. Results: 129 patients underwent OR to TDF from other opioids. The mean age was 56 years, 59% male, and 88% had advanced cancer. The median time between OR and follow up was 14 days. Uncontrolled pain (80%) was the most frequent reason for OR and 59% had a successful OR with significant improvement in ESAS pain, constipation, and symptom distress scores. In 101 patients with OR and no worsening of pain at follow up, the median ORR (range) from net MEDD to TDF mg/day was .01 (-0.02-0.04) and correlation of TDF dose to net MEDD was .77 (P &lt; .0001). The ORR was not significantly impacted by variables such as mucositis, serum albumin, and body mass index (BMI). The ORR of .01 suggests that MEDD of 100mg is equivalent to 1mg TDF/day or 40mcg/hour TDF patch (1000mcg/24hours). Conclusions: The median ORR from MEDD to TDF mg/day is .01 and the ORR from MEDD to TDF mcg/hour patch is 0.4. Further validation studies are needed. [Table: see text]

Intrathecal Drug Delivery Systems are underutilised in the management of refractory cancer pain despite evidence of their efficacy. Not all patients who are offered this treatment modality accept it. There is no current evidence that indicates if the use of intrathecal drug delivery systems impacts on place of care for patients with cancer related pain. This service evaluation compared place of care, place of death and morphine equivalent daily dose at end of life for patients in whom Intrathecal Drug Delivery was successfully established versus those who chose comprehensive medical management. A retrospective longitudinal cohort study of 45 patients with cancer pain comparing those who had ongoing analgesia successfully delivered via an implanted Intrathecal Drug Delivery System (n = 28) with those who continued to receive comprehensive medical management (n = 17). There was a markedly greater time spent in the community in the intrathecal group than the medical management group (median 126.5vs 25.5 days; p = 0.002) and a lower morphine equivalent daily dose at end of life (median 127.5vs 440.0 p = 0.022). In patients with advanced cancer, the successful establishment of intrathecal analgesia is associated with more time in the community and a lower morphine equivalent daily dose at end of life. The study has low numbers, and the sample was retrospectively selected. Nevertheless, these findings suggest the initial investment of time in an inpatient setting may be beneficial. Further research is required, using larger, prospective studies of patient outcomes in this setting.