Sympathetic Blockade for Pain Associated With Nonaxial Bone Lesions in Patients With Cancer: An Uncontrolled Cohort.

Background: Cancer-related bone pain remains a prevalent and frequently incapacitating ailment. Although conventional approaches effectively alleviate pain in most individuals, a subset of patients may continue to experience intractable pain. Current recommendations for treating cancer-related bone pain include oral analgesics and multimodal adjuvants, radiation therapy, and, in selected cases, intrathecal therapy. Cancer-related bone pain is mediated by a proliferation of sensory and sympathetic fibers. Thus, we believe that this pain can be successfully managed with minimally invasive sympathetic blockade (SB).

Methods: In a retrospective observational cohort, we reviewed patients who underwent single-shot SB for uncontrolled cancer-related bone pain despite receiving opiate analgesics and other interventions. We documented the Edmonton Symptom Assessment Scale (ESAS) ratings, the numeric rating scale (NRS) pain scores, and the morphine equivalent daily dose (MEDD) before and after SB.

Results: The final cohort included 43 patients (median age, 58 years [range, 23-86 years]) with a history of bone pain experienced for a median of 6 months (IQR, 3-12 months). Comparing before and after the SB, patients had pain reduction -6 (IQR, -7 to -4; P<.001), reduction of ESAS scores of -17 (IQR, -23 to -3; P<.001), and reduction of MEDD -57 mg (95% CI, -79 to -34; P<.001). The treatment was well tolerated.

Conclusions: Blockade of sympathetic afferent innervation is an effective and cost-effective modality that can be safely used to palliate intractable pain in patients with malignant bone pain.