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Intraoperative Protective Ventilation for Obese Patients Undergoing Gynaecological Laparoscopic Surgery (Inprove4large)

16 maj 2019 uppdaterad av: Massimo Antonelli, Catholic University of the Sacred Heart

Intraoperative Protective Ventilation for Obese Patients Undergoing Gynaecological Laparoscopic Surgery. A Single-centre Randomized, Controlled Trial

Background. The use of a comprehensive strategy providing low tidal volumes, peep and recruiting maneuvers in patients undergoing open abdominal surgery improves postoperative respiratory function and clinical outcome. It is unknown whether such ventilatory approach may be feasible and/or beneficial in patients undergoing laparoscopy, as pneumoperitoneum and Trendelenburg position may alter lung volumes and chest-wall elastance.

Objective. The investigators designed a randomized, controlled trial to assess the effect of a lung-protective ventilation strategy on postoperative oxygenation in obese patients undergoing laparoscopic surgery.

Studieöversikt

Status

Avslutad

Betingelser

Intervention / Behandling

Studietyp

Interventionell

Inskrivning (Faktisk)

60

Fas

  • Inte tillämpbar

Kontakter och platser

Det här avsnittet innehåller kontaktuppgifter för dem som genomför studien och information om var denna studie genomförs.

Studieorter

  • Italien
      • Rome, Italien, 00100
        • General surgery OR, A. Gemelli hospital

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

18 år och äldre (Vuxen, Äldre vuxen)

Tar emot friska volontärer

Nej

Kön som är behöriga för studier

Kvinna

Beskrivning

Inclusion Criteria:

  • scheduled for gynaecological laparoscopic surgery in the Trendelenburg position
  • Obesity with body mass index>35 kg/m^2
  • written informed consent

Exclusion Criteria:

  • Clinical history or signs of chronic heart failure
  • history of neuromuscular disease
  • history of thoracic surgery
  • pregnancy
  • chronic respiratory failure requiring long-term oxygen administration

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: Randomiserad
  • Interventionsmodell: Parallellt uppdrag
  • Maskning: Ingen (Open Label)

Vapen och interventioner

Deltagargrupp / Arm
Intervention / Behandling
Experimentell: Protective ventilation
Volume controlled ventilation with tidal volume 6-7 ml/kg of predicted body weight (45.5 + 0.91 (height [cm] -152.4)), FiO2 0.4 and PEEP 10 cmH2O during the whole study period. Respiratory rate will be titrated to keep end-tidal CO2 values between 30 and 40 mmHg. I:E ratio will be set in order to obtain an inspiratory time of 0.8 seconds and an inspiratory pause of 0.3 seconds and FiO2 will be kept unchanged during the whole study period. In patients in this group, recruiting maneuvers will be performed throughout a stepwise 5 cmH2O PEEP increase every 30 seconds to achieve a PEEP of 35 cmH2O during Pressure Controlled Ventilation (10 cmH2O of inspiratory pressure while keeping respiratory rate unmodified), followed by a stepwise 5 cmH2O PEEP reduction every 30 seconds until the baseline set peep is reached.
Läkemedel: Intravenous anesthetic
Anaesthesia induction will be obtained with i.v. 2-3 mg/kg propofol, 0,6-0,8 mcg/kg fentanyl, and 0.9-1,2 mg/kg rocuronium. Anaesthesia will be maintained with i.v. propofol continuous infusion, with a dose titrated to achieve a bi-spectral index value between 40 and 50
Läkemedel: Crystalloid Solutions
Balanced crystalloids will be administered to patients in both groups as a standard rate of 3-5 ml/kg/h. Treatment of eventual hemodynamic instability will be left to the attending physician
Diagnostiskt test: Esophageal pressure measurement
A nasogastric polyfunctional tube (Nutrivent, Sidam, Italy) will be placed after anaesthesia induction in all enrolled patients to measure esophageal pressure, estimate pleural pressure and compute transpulmonary pressure
Diagnostiskt test: Lung volume measurement with the nitrogen washin-washout technique
Lung volume will be measured through nitrogen wash-in wash-out technique and low-flow Pressure-volume curve will be recorded to estimate differences in alveolar recruitment between the two study groups.
Aktiv komparator: Standard Ventilation
Volume controlled ventilation with tidal volume 10 ml/kg of PBW (45.5 + 0.91 (height [cm] -152.4)), FiO2 0.4 and PEEP 5 cmH2O during the whole study period. Respiratory rate will be titrated to keep end-tidal CO2 values between 30 mmHg and 40 mmHg. I:E ratio will be set in order to obtain an inspiratory time of 0.8-1 seconds and an inspiratory pause of 0.3 second
Läkemedel: Intravenous anesthetic
Anaesthesia induction will be obtained with i.v. 2-3 mg/kg propofol, 0,6-0,8 mcg/kg fentanyl, and 0.9-1,2 mg/kg rocuronium. Anaesthesia will be maintained with i.v. propofol continuous infusion, with a dose titrated to achieve a bi-spectral index value between 40 and 50
Läkemedel: Crystalloid Solutions
Balanced crystalloids will be administered to patients in both groups as a standard rate of 3-5 ml/kg/h. Treatment of eventual hemodynamic instability will be left to the attending physician
Diagnostiskt test: Esophageal pressure measurement
A nasogastric polyfunctional tube (Nutrivent, Sidam, Italy) will be placed after anaesthesia induction in all enrolled patients to measure esophageal pressure, estimate pleural pressure and compute transpulmonary pressure
Diagnostiskt test: Lung volume measurement with the nitrogen washin-washout technique
Lung volume will be measured through nitrogen wash-in wash-out technique and low-flow Pressure-volume curve will be recorded to estimate differences in alveolar recruitment between the two study groups.

Vad mäter studien?

Primära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Postoperative oxygenation
Tidsram: One hour after extubation
PaO2/FiO2 ratio 1 hour after extubation, while the patient is receiving oxygen through VenturiMask 40%
One hour after extubation

Sekundära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Postoperative forced expiratory volume in 1 second (FEV1)
Tidsram: 48 hours after the end of surgery
volume exhaled during the first second of a forced expiratory maneuver started from the level of total lung capacity
48 hours after the end of surgery
Postoperative forced vital capacity (FVC)
Tidsram: 48 hours after the end of surgery
the total amount of air exhaled during a forced expiratory maneuver started from the level of total lung capacity
48 hours after the end of surgery
Postoperative Tiffeneau index
Tidsram: 48 hours after the end of surgery
computed as FEV1/FVC
48 hours after the end of surgery
Postoperative Dyspnea
Tidsram: 1 hour after surgery
Dyspnea assessed by Borg dyspnea scale
1 hour after surgery
Pulmonary infection
Tidsram: 24 hours after the end of surgery
modified clinical pulmonary infection score (mCPIS)
24 hours after the end of surgery
Postoperative pulmonary infiltrates
Tidsram: 24 hours after the end of surgery
Evaluated with the chest x-ray by two independent clinicians blinded to treatment assignment
24 hours after the end of surgery
Intraoperative driving pressure
Tidsram: during surgery, recorded on a 60-minute basis
driving pressure, computed as Plateau pressure-PEEP
during surgery, recorded on a 60-minute basis
Intraoperative lung driving pressure
Tidsram: during surgery, recorded on a 60-minute basis
transpulmonary driving pressure, computed as Transpulmonary end-inspiratory pressure-transpulmonary total end-expiratory pressure
during surgery, recorded on a 60-minute basis
Intraoperative oxygenation
Tidsram: during surgery, recorded on a 60-minute basis
PaO2/FiO2
during surgery, recorded on a 60-minute basis
Intraoperative dead space
Tidsram: during surgery, recorded on a 60-minute basis
Approximated as the difference between End-tidal CO2 and PaCO2 divided by PaCO2
during surgery, recorded on a 60-minute basis
Lung recruitment
Tidsram: during surgery, recorded on a 60-minute basis
lung recruitment/changes in end expiratory lung volume between the two groups
during surgery, recorded on a 60-minute basis
Intraoperative blood pressure
Tidsram: during surgery, recorded on a 60-minute basis
Arterial blood pressure
during surgery, recorded on a 60-minute basis
Intraoperative respiratory system compliance
Tidsram: during surgery, recorded on a 60-minute basis
computed as Tidal volume/airway driving pressure
during surgery, recorded on a 60-minute basis
Intraoperative lung compliance
Tidsram: during surgery, recorded on a 60-minute basis
computed as Tidal volume/lung driving pressure
during surgery, recorded on a 60-minute basis

Samarbetspartners och utredare

Det är här du hittar personer och organisationer som är involverade i denna studie.

Sponsor

Catholic University of the Sacred Heart

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 (Faktisk)

1 maj 2017

Primärt slutförande (Faktisk)

31 mars 2019

Avslutad studie (Faktisk)

31 mars 2019

Studieregistreringsdatum

Först inskickad

12 maj 2017

Först inskickad som uppfyllde QC-kriterierna

15 maj 2017

Första postat (Faktisk)

17 maj 2017

Uppdateringar av studier

Senaste uppdatering publicerad (Faktisk)

20 maj 2019

Senaste inskickade uppdateringen som uppfyllde QC-kriterierna

16 maj 2019

Senast verifierad

1 maj 2019

Mer information

Termer relaterade till denna studie

Nyckelord

Ytterligare relevanta MeSH-villkor

Andra studie-ID-nummer

  • InproveForLarge

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