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Catheter Redosing of Autonomic Neural Blockade After Sleeve Gastrectomy

13 juni 2026 uppdaterad av: Universidad Simón Bolívar

Targeted Temporary In Situ Catheter Redosing of Autonomic Neural Blockade for Breakthrough Symptoms After Laparoscopic Sleeve Gastrectomy

Postoperative visceral pain and autonomic symptoms after laparoscopic sleeve gastrectomy may reappear earlier in selected high-risk patients despite standard intraoperative autonomic neural blockade (ANB). Temporary in situ catheter placement permits postoperative ANB redosing when breakthrough visceral symptoms occur.

This prospective single-arm observational study will evaluate the feasibility, safety, and clinical effectiveness of temporary ANB catheter placement and selective postoperative redosing in high-risk patients undergoing laparoscopic sleeve gastrectomy.

Studieöversikt

Status

Har inte rekryterat ännu

Betingelser

Intervention / Behandling

Detaljerad beskrivning

Autonomic neural blockade (ANB) selectively modulates visceral pain and autonomic symptoms after minimally invasive upper gastrointestinal surgery. Prior randomized trials have demonstrated reductions in pain, analgesic requirements, PONV, and anesthetic consumption following ANB during laparoscopic sleeve gastrectomy (LSG). However, breakthrough visceral symptoms may occur in selected patients after blockade wanes.

A prior feasibility study by our group demonstrated that temporary in situ catheter placement for postoperative ANB redosing after LSG is technically feasible and safe, establishing catheter selection, placement strategy, and anatomical targets.

This prospective pilot study evaluates the clinical utility of selective postoperative ANB redosing in predefined high-risk patients.

All participants will undergo standard intraoperative ANB, TAP block, and temporary catheter placement in one of three anatomically validated paragastric/celiac pathway locations. Scheduled acetaminophen will be administered postoperatively.

Prior to any redosing, the treating investigator will clinically assess whether symptoms are consistent with visceral/autonomic breakthrough rather than somatic/incisional pain. Pain characteristics suggesting visceral origin include diffuse, deep, poorly localized epigastric/substernal discomfort, associated nausea/vomiting, autonomic symptoms, or pain disproportionate to abdominal wall tenderness.

Patients meeting redosing criteria will receive catheter redosing with 15 mL of 0.5% bupivacaine plus 4 mg dexamethasone. The minimum interval between re-dosing will be eight hours.

Concomitant hiatal hernia repair will be recorded for all patients, given the potential influence of distal phrenic nerve blockade on postoperative symptom patterns.

Studietyp

Interventionell

Inskrivning (Beräknad)

30

Fas

  • Inte tillämpbar

Kontakter och platser

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Studiekontakt

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Deltagandekriterier

Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.

Urvalskriterier

Åldrar som är berättigade till studier

  • Vuxen
  • Äldre vuxen

Tar emot friska volontärer

Nej

Beskrivning

Inclusion Criteria:

Patients undergoing elective laparoscopic sleeve gastrectomy with one or more of the following risk factors for breakthrough visceral/autonomic symptoms:

  • Female sex age <30 years
  • Prior history of severe postoperative pain after abdominal surgery
  • Prior history of significant postoperative nausea/vomiting
  • History of opioid intolerance or significant opioid-related adverse effects
  • Allergy/intolerance to multiple postoperative analgesics/antiemetics
  • Concomitant hiatal hernia repair
  • Surgeon's judgment of elevated visceral symptom risk based on prior institutional experience

Exclusion Criteria:•

  • Contraindication to local anesthetics or dexamethasone
  • Chronic opioid dependence
  • Severe psychiatric or cognitive impairment limiting symptom assessment
  • Pregnancy
  • Conversion to open surgery
  • Inability or unwillingness to comply with the postoperative reporting protocol.

Studieplan

Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.

Hur är studien utformad?

Designdetaljer

  • Primärt syfte: Behandling
  • Tilldelning: N/A
  • Interventionsmodell: Enskild gruppuppgift
  • Maskning: Ingen (Open Label)

Vapen och interventioner

Deltagargrupp / Arm
Intervention / Behandling
Experimentell: Catheter Re-dosing for Breakthrough Symptoms After LSG
Participants with breakthrough symptoms, defined as visceral pain of 4/10 or higher, postoperative nausea, or vomiting, will receive 15 mL of bupivacaine 0.5% plus dexamethasone 4 mg through the temporary catheter. Symptom response will be recorded 15 minutes after administration. Catheter re-dosing may be repeated if breakthrough visceral/autonomic symptoms recur, provided that at least 8 hours have elapsed since the prior dose and the participant remains under direct institutional supervision. The catheter will be removed 24 hours postoperatively or before hospital discharge, whichever occurs first.
Övrig: Bupivacaine 0.5% and Dexamethasone via Temporary Catheter
Autonomic neural blockade (ANB) re-dosing will be performed by administering bupivacaine 0.5% and dexamethasone through a temporary catheter placed in the paragastric area during laparoscopic sleeve gastrectomy

Vad mäter studien?

Primära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Clinical Response to autonomic neural blockade(ANB) Redosing
Tidsram: Up to 24 hours postoperatively
Change in visceral pain score measured on a 10-point visual analog scale before and after autonomic neural blockade re-dosing. A clinically meaningful response is defined as a reduction of 2 or more points.
Up to 24 hours postoperatively
Resolution of Postoperative Nausea or Vomiting After ANB Re-dosing
Tidsram: Up to 24 hours postoperatively
Resolution of postoperative nausea or vomiting when present before autonomic neural blockade re-dosing, assessed as present or absent after treatment.
Up to 24 hours postoperatively
Proportion of Participants With Successful Temporary Catheter Placement and Function
Tidsram: Intraoperative through 24 hours postoperatively
Successful temporary catheter placement and function, assessed as a binary yes/no measure. Success is defined as intraoperative placement of the catheter in the intended paragastric location with catheter patency sufficient to allow postoperative administration of the study intervention if clinically indicated.
Intraoperative through 24 hours postoperatively

Sekundära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Incidence of Clinically Significant Breakthrough Visceral Symptoms Despite Standard Intraoperative ANB
Tidsram: Up to 24 hours postoperatively
Proportion of enrolled patients requiring at least one postoperative catheter re-dosing.
Up to 24 hours postoperatively
Number of Re-dosing Events Per Patient
Tidsram: Up to 24 hours postoperatively
Total number of postoperative autonomic neural blockade catheter re-dosing episodes administered to each participant during the postoperative catheter-use period.
Up to 24 hours postoperatively
Safety of Temporary ANB Catheter Technique
Tidsram: 8 postoperative days

Incidence of catheter-related or ANB-related adverse events, including:

  • Bleeding
  • Infection
  • Catheter dysfunction requiring premature removal or preventing intended redosing.
8 postoperative days
Postoperative Pain Scores Compared with Historic Institutional Controls
Tidsram: 8, 24, and 48 hours postoperatively
Comparison of postoperative pain scores measured using the Visual Analog Scale for pain, ranging from 0 to 10, where 0 indicates no pain and 10 indicates the worst pain. Scores will be compared at 8, 24, and 48 hours after surgery with a prior institutional laparoscopic sleeve gastrectomy cohort managed under an identical perioperative protocol but without catheter placement or autonomic neural blockade re-dosing. In participants requiring re-dosing, pain scores obtained before rescue intervention will be used for comparison.
8, 24, and 48 hours postoperatively
Postoperative Nausea and Vomiting Compared with Historic Institutional Controls
Tidsram: 8, 24, and 48 hours postoperatively
Comparison of postoperative nausea and vomiting events at 8, 24, and 48 hours after surgery with a prior matched institutional laparoscopic sleeve gastrectomy cohort managed under an identical perioperative protocol but without catheter placement or ANB redosing. In patients requiring redosing, the presence of nausea or vomiting documented prior to rescue intervention will be used for comparison.
8, 24, and 48 hours postoperatively
Re-dosing Requirement by Concomitant Hiatal Hernia Repair Status
Tidsram: Up to 24 hours postoperatively.
Exploratory comparison of the proportion of participants requiring at least one postoperative catheter re-dosing between participants undergoing laparoscopic sleeve gastrectomy with versus without concomitant hiatal hernia repair.
Up to 24 hours postoperatively.

Samarbetspartners och utredare

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Sponsor

Universidad Simón Bolívar

Utredare

  • Huvudutredare: Jorge Daes, MD, clinica Iberoamerica

Publikationer och användbara länkar

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Allmänna publikationer

Användbara länkar

Studieavstämningsdatum

Dessa datum spårar framstegen för inlämningar av studieposter och sammanfattande resultat till ClinicalTrials.gov. Studieposter och rapporterade resultat granskas av National Library of Medicine (NLM) för att säkerställa att de uppfyller specifika kvalitetskontrollstandarder innan de publiceras på den offentliga webbplatsen.

Studera stora datum

Studiestart (Beräknad)

15 juni 2026

Primärt slutförande (Beräknad)

1 januari 2027

Avslutad studie (Beräknad)

1 februari 2027

Studieregistreringsdatum

Först inskickad

29 maj 2026

Först inskickad som uppfyllde QC-kriterierna

13 juni 2026

Första postat (Faktisk)

18 juni 2026

Uppdateringar av studier

Senaste uppdatering publicerad (Faktisk)

18 juni 2026

Senaste inskickade uppdateringen som uppfyllde QC-kriterierna

13 juni 2026

Senast verifierad

1 juni 2026

Mer information

Termer relaterade till denna studie

Nyckelord

Ytterligare relevanta MeSH-villkor

Andra studie-ID-nummer

  • CI0012026

Plan för individuella deltagardata (IPD)

Planerar du att dela individuella deltagardata (IPD)?

JA

IPD-planbeskrivning

We plan to share the study protocol, statistical analysis plan (SAP), informed consent form (ICF), and selected de-identified participant-level data upon reasonable academic request after publication of the study results.

Tidsram för IPD-delning

Beginning 6 months after publication of the primary study results and continuing for up to 5 years.

Kriterier för IPD Sharing Access

De-identified individual participant data and supporting documents may be shared with qualified academic investigators upon reasonable request for scientific or educational purposes, following review and approval by the principal investigator and institution, and in accordance with patient confidentiality and institutional policies.

IPD-delning som stöder informationstyp

  • STUDY_PROTOCOL
  • SAV
  • ICF
  • CSR

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