Pain Clinical Trial
Official title:
Persistent Pain After Colonic Endoscopic Mucosal Resection: Predictors, a Management Algorithm and Outcomes
Endoscopic mucosal resection (EMR) of large (≥20 mm) laterally spreading colonic lesions (LSL) is safe, effective and superior to surgery. This advantage is based on a day stay model of care, however the most common adverse event is abdominal pain and this is a major impediment to this efficiency. No prospective data exist on the optimal selection of analgesics, the necessary recovery period or the triggers that should alert the practitioner to a more serious trajectory and the need for escalation of care. We aimed to characterise potential predictors for persistent (>5 minutes) post-procedural pain (PP) and develop a simple and effective management algorithm for patients with PP based on the need for analgesics in recovery. Data on consecutive patients with a LSL referred for EMR at a single, tertiary referral centre were included. Patient and lesion characteristics and peri-procedural data were prospectively collected. Standard post EMR care included 2 hours in first stage recovery followed by 1 hour in 2nd stage recovery where clear fluids were given and discharge after if the patients were well. PP was graded from 0 to 10 using a Visual Analogue Scale (VAS). If PP occurred >5 minutes, 1 gram of paracetamol was administered parenterally and outcomes were monitored. If pain settled the patient was transferred to second stage recovery after medical review. PP >30 minutes lead to clinical review and upgrade of analgesics to fentanyl, with a starting dose of 25 micrograms (mcg) up to a maximum of 100 mcg. Investigations, admission and interventions for PP are recorded.
Large, sessile, colonic polyps of ≥ 20 mm are at increased risk of progressing to colorectal cancer (CRC). Most colonic polyps are small and pedunculated and can be safely removed by conventional polypectomy. Treatment of large polyps however, is challenging but very important in preventing development of CRC, the second leading cause of cancer deaths worldwide. Early detection and treatment of these polyps, possible through vigilant CRC screening via colonoscopy, shows significant reduction in incidence of CRC. Over the last decade, endoscopic mucosal resection (EMR) has been recognised as a safe and reliable alternative to surgery to remove large, sessile colonic polyps of ≥ 20mm. The benefits of EMR over traditional surgery include reduced risk of peri- and post-operative complications from surgery (particularly in elderly patients with multiple co-morbidities), less health expenditure and reduced length of hospital admission. The majority of patients can be managed safely as outpatients post EMR. EMR has been proven to be a safer alternative to traditional surgery, but is a technically challenging procedure. The most common complication post procedure is non-specific abdominal pain, which occurs in 10-20% of cases. The cause is often innocent such as simple luminal distension during the procedure. The advent of improved EMR techniques, for example using carbon dioxide instead of air insufflation, significantly reduces incidence of abdominal pain and subsequently need for admission. Colonic perforation during colonoscopy rates range from 0.06 to 0.1%. Advanced age, female gender, having a colonoscopy indication of abdominal pain or Crohn's disease, result in a statistically higher risk of colonic perforation. In addition, ICU inpatients have substantially greater odds of perforation. A recent study, conducted over twelve years in a total of 110,785 patients undergoing diagnostic and therapeutic colonoscopies, showed one case of colonic perforation associated with EMR. Currently, it remains difficult to delineate innocent abdominal pain from more serious complications. There are no standard algorithms used in clinical practice to stratify risk post EMR according to patient's symptoms and there are no data supporting previously proposed pain algorithms. There is also a paucity of data regarding pain scales employed in the past to show significant correlation between pain level and risk of perforation or bleeding. The 100mm Visual Analog Scale (VAS) has been documented to have sound correlation in patients presenting to the emergency department with an acute abdomen and could be a useful aid in a formal assessment based on pain post EMR. With the prospectively recorded data in this study, we aim to validate an algorithm to provide decision support in first stage recovery of Endoscopy Departments. This algorithm on assessment and management of post EMR pain, will identify patients at risk for more serious complications, and will allow health carers to recognize these complications and act more accurately. Ultimately, this will improve patient's outcomes. ;
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