Nebulised surfactant for the treatment of severe COVID-19 in adults (COV-Surf): A structured summary of a study protocol for a randomized controlled trial
Dec 11, 2020Trials
Using inhaled lung surfactant to treat severe COVID-19 in adults: Summary of a planned controlled trial
A total of 20 COVID-19 patients requiring are being evaluated for the safety and efficacy of nebulized surfactant.
SARS-CoV-2 is associated with binding to ACE2 receptors, potentially leading to impaired surfactant synthesis and respiratory failure.
The primary outcome focuses on improvements in oxygenation and ventilation at 48 hours after the intervention.
Adverse events and clinical improvements will be monitored throughout the study.
Participants aged 18 and older with confirmed COVID-19 requiring intubation are included, while those with specific contraindications are excluded.
The trial is designed as a dose-escalating randomized open-label clinical trial with 12 patients receiving the intervention and 8 in the control group.
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OBJECTIVES: SARS-Cov-2 virus preferentially binds to the Angiotensin Converting Enzyme 2 (ACE2) on alveolar epithelial type II cells, initiating an inflammatory response and tissue damage which may impair surfactant synthesis contributing to alveolar collapse, worsening hypoxia and leading to respiratory failure. The objective of this study is to evaluate the feasibility, safety and efficacy of in COVID-19 adult patients requiring for respiratory failure.
TRIAL DESIGN: This study is a dose-escalating randomized open-label clinical trial of 20 COVID-19 patients.
PARTICIPANTS: This study is conducted in two centres: University Hospital Southampton and University College London Hospitals. Eligible participants are aged ≥18, hospitalised with COVID-19 (confirmed by PCR), who require endotracheal intubation and are enrolled within 24 hours of mechanical ventilation. For patients unable to consent, assent is obtained from a personal legal representative (PerLR) or professional legal representative (ProfLR) prior to enrolment. The following are exclusion criteria: imminent expected death within 24 hours; specific contraindications to surfactant administration (e.g. known allergy, pneumothorax, pulmonary hemorrhage); known or suspected pregnancy; stage 4 chronic kidney disease or requiring dialysis (i.e., eGFR < 30); liver failure (Child-Pugh Class C); anticipated transfer to another hospital, which is not a study site, within 72 hours; current or recent (within 1 month) participation in another study that, in the opinion of the investigator, would prevent enrollment for safety reasons; and declined consent or assent.
INTERVENTION AND COMPARATOR: Intervention: The study is based on an investigational drug/device combination product. The surfactant product is Bovactant (Alveofact®), a natural animal derived (bovine) lung surfactant formulated as a lyophilized powder in 108 mg vials and reconstituted to 45 mg/mL in buffer supplied in a prefilled syringe. It is isolated by lung lavage and, by weight, is a mixture of: phospholipid (75% phosphatidylcholine, 13% phosphatidylglycerol, 3% phosphatidylethanolamine, 1% phosphatidylinositol and 1% sphingomyelin), 5% cholesterol, 1% lipid-soluble surfactant-associated proteins (SP-B and SP-C), very low levels of free fatty acid, lyso-phosphatidylcholine, water and 0.3% calcium. The Drug Delivery Device is the AeroFact-COVID™ nebulizer, an investigational device based on the Aerogen® Solo vibrating mesh nebulizer. The timing and escalation dosing plans for the surfactant are as follows. Cohort 1: Three patients will receive 10 vials (1080 mg) each of surfactant at dosing times of 0 hours, 8 hours and 24 hours. 2 controls with no placebo intervention. Cohort 2: Three patients will receive 10 vials (1080 mg) of surfactant at dosing times of 0 hours and 8 hours, and 30 vials (3240 mg) at a dosing time of 24 hours. 2 controls with no placebo intervention. Cohort 3: Three patients will receive 10 vials (1080 mg) of surfactant at a dosing time of 0 hours, and 30 vials (3240 mg) at dosing times of 8 hours and 24 hours. 2 controls with no placebo intervention. Cohort 4: Three patients will receive 30 (3240 mg) vials each of surfactant at dosing times of 0 hours, 8 hours and 24 hours. 2 controls. 2 controls with no placebo intervention. The trial steering committee, advised by the data monitoring committee, will review trial progression and dose escalation/maintenance/reduction after each cohort is completed (48-hour primary outcome timepoint reached) based on available feasibility, adverse event, safety and efficacy data. The trial will not be discontinued on the basis of lack of efficacy. The trial may be stopped early on the basis of safety or feasibility concerns. Comparator: No placebo intervention. All participants will receive usual standard of care in accordance with the local policies for mechanically ventilated patients and all other treatments will be left to the discretion of the attending physician.
MAIN OUTCOMES: The co-primary outcome is the improvement in oxygenation (PaO/FiOratio) and pulmonary ventilation (Ventilation Index (VI), where VI = [RR x (PIP - PEEP) × PaCO]/1000) at 48 hours after study initiation. The secondary outcomes include frequency and severity of adverse events (AEs), Adverse Device Effects (ADEs), Serious Adverse Events (SAEs) and Serious Adverse Device Events (SADEs), change in pulmonary compliance, change in positive end-expiratory pressure (PEEP) requirement of ventilatory support at 24 and 48 hours after study initiation, clinical improvement defined by time to one improvement point on the ordinal scale described in the WHO master protocol (2020) recorded while hospitalised, days of mechanical ventilation, mechanical ventilator free days (VFD) at day 21, length of intensive care unit stay, number of days hospitalised and mortality at day 28. Exploratory end points will include quantification of SARS-CoV-2 viral load from tracheal aspirates using PCR, surfactant dynamics (synthesis and turnover) and function (surface tension reduction) from deep tracheal aspirate samples (DTAS), surfactant phospholipid concentrations in plasma and DTAS, inflammatory markers (cellular and cytokine) in plasma and DTAS, and blood oxidative stress markers. 2 2 2
RANDOMISATION: After informed assent, patients fulfilling inclusion criteria will be randomised to 3:2 for the treatment and control arms using an internet-based block randomization service (ALEA tool for clinical trials, FormsVision BV) in combination with electronic data collection. Randomisation will be done by the recruiting centre with a unique subject identifier specific to that centre.
BLINDING (MASKING): This is an open-labelled unblinded study.
NUMBERS TO BE RANDOMISED (SAMPLE SIZE): The total sample size is 20 COVID-19 mechanically ventilated patients (12 intervention; 8 control).
TRIAL STATUS: Current protocol version is V2 dated 5of June 2020. The recruitment is currently ongoing and started on the 14of October 2020. The anticipated study completion date is November 2021. th th
TRIAL REGISTRATION: ClinicalTrials.gov: NCT04362059 (Registered 24 April 2020), EUDAMED number: CIV-GB-20-06-033328, EudraCT number: 2020-001886-35 (Registered 11 May 2020) FULL PROTOCOL: The full protocol is attached as an additional file, accessible from the Trials website (Additional file 1). In the interest in expediting dissemination of this material, the familiar formatting has been eliminated; this Letter serves as a summary of the key elements of the full protocol. The study protocol has been reported in accordance with the Standard Protocol Items: Recommendations for Clinical Interventional Trials (SPIRIT) guidelines (Additional file 2).
Key numbers
20
Total Sample Size
20 COVID-19 mechanically ventilated patients will be enrolled.
12 of 20
Intervention vs. Control Ratio
12 participants will receive , while 8 will be controls.
Full Text
What this is
This protocol outlines a randomized controlled trial for in severe COVID-19 patients requiring .
The study aims to assess feasibility, safety, and efficacy of the surfactant treatment.
Participants will be enrolled within 24 hours of and will receive standard care alongside the intervention.
Essence
will be evaluated for its feasibility, safety, and efficacy in COVID-19 patients on . The study involves a dose-escalating design with 20 participants.
Caveats
The study is open-label and unblinded, which may introduce bias in outcome assessment.
The sample size is small (20 patients), limiting the generalizability of the findings.
Definitions
Nebulised surfactant: A treatment involving a lung surfactant delivered via nebulization to improve lung function.
Mechanical ventilation: A medical intervention that provides respiratory support to patients who cannot breathe adequately on their own.
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Supplementary Information
Additional file 1. Full Study Protocol.Additional file 2. SPIRIT 2013 Checklist: Recommended items to address in a clinical trial protocol and related documents.
