A Prospective Observational Study of High-Dose Intrathecal Diamorphine in Laparoscopic Bariatric Surgery: a Single-Centre Experience

Single-shot spinal diamorphine for laparoscopic nephrectomy: A retrospective study

Single-shot spinal diamorphine is becoming common practice in urological surgery to aid post-operative pain; however, its safety and efficacy require investigation. This study is a retrospective analysis of 113 laparoscopic or robotic-assisted nephrectomies over 4 years under one consultant urologist. Data were collected on demographic, pre-operative scores, anaesthesia, surgical information, post-operative outcomes and opioid consumption. Two main groups were established: no spinal diamorphine (NSD) and spinal diamorphine (SD). Four subgroups were then created, separating those who received patient-controlled anaesthesia (PCA) or not: Group 1 [general anaesthetic (GA)]; Group 2 [GA and PCA]; Group 3 [GA and spinal diamorphine] and Group 4 [GA, spinal diamorphine and PCA]. Ninety-eight eligible patients were identified. At 6 hours, pain scores were significantly higher for all non-spinal groups (p < 0.05); at 9 h, pain scores were significantly higher in NSD patients compared to SD (p = 0.026); at 12 h, pain scores were significantly higher for NSD patients compared to SD (p = 0.024), and Group 1 compared to Group 3 (p = 0.023). Total opioid consumption in the first 24 h post-surgery was higher in Group 1 compared to Group 3 (p = 0.024). There was no higher incidence of urinary retention, or any neurological complications reported within the SD patients. The study found a reduction in post-operative pain scores with the use of spinal diamorphine prior to laparoscopic and robotic-assisted nephrectomies. The findings may also suggest that pre-operative spinal diamorphine use can reduce the total volume of opioids administered via other routes in the first 24 h post-operatively. It recommends its routine administration but encourages prospective investigation.

Perioperative Pain Management in Bariatric Anesthesia

Weight loss (bariatric) surgery is the most commonly performed elective surgical procedure in patients with morbid obesity. In this review, we provide an evidence-based update on perioperative pain management in bariatric anesthesia. We mention some newer preoperative aspects—medical optimization, physical preparation, patient education, and psychosocial factors—that can all improve pain management. In the intraoperative period, with bariatric surgery being almost universally performed laparoscopically, we emphasize the use of non-opioid adjuvant infusions (ketamine, lidocaine, and dexmedetomidine) and suggest some novel regional anesthesia techniques to reduce pain, opioid requirements, and side effects. We discuss some postoperative strategies that additionally focus on patient safety and identify patients at risk of persistent pain and opioid use after bariatric surgery. This review suggests that the use of a structured, step-wise, severity-based, opioid-sparing multimodal analgesic protocol within an enhanced recovery after surgery (ERAS) framework can improve postoperative pain management. Overall, by incorporating all these aspects throughout the perioperative journey ensures improved patient safety and outcomes from pain management in bariatric anesthesia.