Continuously protracted infusion of cisatracurium besilate in patients with ARDS.

Background: Acute respiratory distress syndrome (ARDS) is still associated with significant mortality, especially the elderly and those with comorbidities are at highest risk of death. Neuromuscular blocking agents (NMBAs) are used in a large but highly variable proportion of patients with ARDS. Case presentation: We describe the case of one critically ill patient with serious ARDS, because of virus pneumonia. In spite of the reduced tidal volume to 4-6 mL/kg of predicted body weight (PBW) and prone position were applied timely, the irresistible progress of disease leaded to an amazing prolonged application of deep sedation and analgesia, as well as NMBA, for the purpose of lung-protective mechanical ventilation. Result: The clinical and biochemical parameters guided us toward the recognition that cisatracurium, bolus of 0.1 mg/kg followed by a median infusion rate of 1.91 (1.43-9.52) μg/kg.min, combined with continuous infusion of midazolam 3.43 (2.06-6.17) mg/kg.d and remifentanil 3.79 (3.43-8.57) μg/kg.h is efficacious and suitable for continuous muscle paralysis. Conclusion: The intensive care unit (ICU)-acquired weakness (ICU-AW) was inevitable. Besides, an increased demand on drug concentration with the extension of medication time was observed as well.