Introduction
DA is a promising disease-modifying endoscopic treatment for type 2 diabetes (T2D), which targets hypertrophied duodenal mucosa. The FDA-cleared RFVA system (Aqua Medical Inc., Pleasanton, CA) is an emerging technique for DA. This is a single-use, through-the-scope (10.5 FR), circumferential ablation catheter, and an electrosurgical generator that uses RF energy to convert saline into heated vapor at the catheter tip which is released into the duodenum creating a 2 cm treatment zone. The ablation is performed under direct visualization without fluoroscopy. We investigated the RFVA system in a first-in-human pilot dose-escalation study,
Aims & Methods
We aimed to assess the safety, tolerability, and efficacy of RFVA for DA in patients with T2D (NCT05887635). This was a prospective single-centre study enrolling 27 patients with uncontrolled T2D (glycated hemoglobin (HbA1c) 7.5-10%) despite ≥1 oral antidiabetic drug (OAD). DA was performed under general anaesthesia after a 4-week run-in period to ensure stable glycaemic control. Patients were admitted overnight and given a modified post-procedure diet for 14 days. The ablation targeted ≥9 cm of the post-ampullary duodenal mucosa. The initial RFVA dose was 180 J single application (n=2). Once acute safety was established the next patients received 180 J double application (n=11). After establishing chronic safety over four weeks, the final patients received 200 J double application (n=14). The primary outcomes were change in HbA1c at 12- and 24-weeks, and the number of serious adverse events (SAE).
Results
Twenty-seven patients with a mean (SD) T2D duration of 6 years (2.6) underwent DA. The mean age was 54 years (6.6), 48.2% were male, and the mean baseline BMI was 30.3 kg/m2 (4.2). The baseline HbA1c was 8.5% (0.7) and fasting glucose was 8.9 mmol/L (2.6). The technical success of DA was 100%. The mean number of ablations delivered per patient was 5 (180 J single), 14 (180 J double), and 18 (200 J double). In the second half of the cohort, the mean endoscopy time was 43.6 minutes (9.2), catheter time was 30.6 minutes (7), and ablation length was 14.3 cm (1.8). The change in HbA1c at 4 weeks and 12 weeks was -0.9% (0.9; p<0.001) and -1.2% (1.1; p<0.0001), respectively without change in OADs (Table 1). At 12 weeks, 80% (n=20) undergoing double application had a >0.5% reduction in HbA1c. All patients were discharged the next day with no SAE or unanticipated device-related events. There were no episodes of severe hypoglycaemia. Abdominal pain was the most common, self-limiting adverse event with five deemed mild and two moderate (requiring temporary oral antispasmodics). A 4-week follow-up endoscopy and duodenal biopsy (n=27) showed no stricture and normal mucosal histology.
*Compared to baseline values †Data analysed using t-test
|
Table 1 – Clinical outcomes for patients undergoing duodenal ablation.
|
Change at 12 weeks (double application)
| Mean change (SD)*
| P value†
|
| HbA1c - % | -1.2 (1.1) | <0.001
|
Fasting fingerstick glucose - mmol/L
| -1.8 (1.9)
| <0.001
|
| Post-prandial fingerstick glucose - mmol/L | -3.5 (2.4)
| <0.001
|
Fasting blood glucose - mmol/L
| -1.5 (2.3)
| =0.003
|
HOMA-IR
| -1.1 (2.0)
| =0.016
|
| Weight - kg | -2.4 (5.0) | =0.024
|
Body mass index - kg/m2
| -0.9 (1.9) | =0.024
|
Conclusion
DA using RFVA is a safe, well-tolerated, and relatively quick endoscopic procedure for the management of poorly controlled T2D. Early efficacy data shows a clinically significant reduction in HbA1c at 4- and 12-weeks.
Disclosure
RH declares educational grants to support research infrastructure from Cook Medical, Odin Vision, Pentax Medical, Endogastric Solutions, Apollo Endosurgery, Medtronic, and Aqua Medical. LRG, PBH, AN, KC, and RSL all declare educational grants for research support and/or travel costs from Aqua Medical.