Shorter Weaning From Invasive Ventilation With Levosimendan

Objective: To assess the effect of levosimendan on the number of ventilator-free days up until day 28.

Study design: WEANLESS is an investigator-initiated, multicenter, double blind, randomized clinical superiority trial in ventilated adult patients admitted to the ICUs of participating hospitals.

Study population: This study will include 250 patients who are invasively ventilated for more than 48 hours and failed at least one SBT. Patients are enrolled from participating ICUs and randomized within 24 hours after failing their first SBT.

Intervention:

Patients will be randomly assigned in a double-blind manner to receive either levosimendan or placebo. The study medication will be administered as a continuous intravenous infusion over 24 hours, starting at a dose of 0.1 µg/kg/min, with the option to increase to 0.2 µg/kg/min after 4 hours if well tolerated. If weaning is not successful after 7 days, a maximum of four treatment cycles may be given. All patients will continue to receive standard ICU care, including daily assessments of readiness to wean from mechanical ventilation.

In addition to the intervention, health-related quality of life will be assessed using the EQ-5D-5L questionnaire at baseline, 3 months, and 12 months after inclusion. Dyspnea scores will be recorded daily after extubation until ICU discharge.

Main study parameters/endpoints: The primary endpoint of the study is the number of ventilator-free days and alive (VFD) at day 28 from randomization. This is a composite endpoint combining both mortality and the duration of ventilation. Secondary outcomes include ventilator-free days at day 90, dyspnea scores, reintubation rates, ICU readmission, ICU length of stay, hospital length of stay and mortality. Safety outcomes include the occurrence of cardiac arrhythmias, changes in vasopressor requirements and other adverse events related to levosimendan.

Nature and extent of the burden and risks associated with participation, benefit and group relatedness: The burden for participants is minimal. Levosimendan is a registered drug with a known safety profile and is already used in critical care settings. The placebo is an infusion with Soluvit. All other care follows standard ICU procedures. Data will be collected from the electronic medical record and routine monitoring. No additional invasive procedures are required solely for the main study.