Acute Pain Clinical Trial
Official title:
Efficacy of Premixed Nitrous Oxide and Oxygen in Patient With Out-of-hospital Moderate Acute Pain: a Randomized Double-blind Study
Less than 10% of patients with a traumatic pain have been managed by a physician before to be admitted in an emergency service. 50 % of those patients have been carried by paramedics. Premixed nitrous oxide and oxygen is often used by paramedics, but no scientific studies have demonstrated its efficacy. The aim of the study is to demonstrate the efficacy of premixed nitrous oxide and oxygen in patients with out-of-hospital moderate acute pain.
The study will evaluate the efficacy of premixed nitrous oxide and oxygen (MEOPA) in
patients with out-of-hospital moderate acute pain.
The primary endpoint is the percentage of patients with pain relief (with a numerical rating
scale of 3/10 or lower) 15 minutes after randomisation. Secondary endpoints are treatment
safety and adverse events, time to analgesia and duration of analgesia. This study will
expect 60 patients assigned in two parallel groups, defined by a randomization scheme. Group
assignments were sealed in opaque envelopes and will be open sequentially by the dispatcher
when the paramedic is ready to include the patient. The letter contained in the envelope
corresponds to the cylinder to use. Eligible patients with a numeric rating scale (NRS)
score between 3 and 6/10 are randomly allocated to receive either MEOPA, or medical air.
Fifteen minutes after the randomisation, all patients will receive MEOPA from a distinct
cylinder. Pain score will be measured at baseline and every 5 minutes until pain relief will
be obtained. The paramedic blinded to the analgesic treatment groups will do all assessments
of patients. The safety evaluation will include non invasive monitoring of blood pressure,
heart rate, oxygen saturation by pulse oximetry (SpO2) and adverse events collection.
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