Intrathecal Drug Delivery as a Rescue Strategy in Patients with Spinal Cord Stimulation: A Single-Center Case Series

Background: Chronic pain is the leading cause of years lived with disability worldwide, with low back pain representing the most prevalent and disabling condition. Spinal cord stimulation (SCS) and intrathecal drug delivery (IDD) systems are established neuromodulation techniques for refractory chronic pain. However, a subset of patients experiences partial or declining benefit with either modality alone. In such cases, combined therapy may represent a rescue strategy. Methods: retrospective case series at a single center, including patients previously implanted with SCS who subsequently required IDD due to loss of efficacy or inadequate pain coverage. Pain intensity, opioid consumption, health-related quality of life, and patient satisfaction were assessed using validated instruments. Results: Twelve patients were included. Persistent low back pain with mixed nociceptive-neuropathic features was the most common indication. Combined therapy was observed in association with a mean reduction of 3.5 points on the Numeric Rating Scale, corresponding to an approximate 40% decrease in pain intensity. More than half of the patients discontinued systemic opioids. Complications occurred in seven patients (58.3%), mostly hardware-related and manageable with surgical revision; only one patient developed a device-related infection. Conclusions: In this case series, combined SCS and IDD therapy was observed in association with clinically meaningful pain reduction, decreased opioid use, and high patient-reported satisfaction. Although quality-of-life scores remained below population norms, patients consistently reported subjective improvement. Combined neuromodulation may represent a valid rescue option in selected patients with insufficient response to SCS alone.