Neurally adjusted ventilatory assist in patients recovering spontaneous breathing after acute respiratory distress syndrome: physiological evaluation

Critical Care Medicine
Nicolas TerziFrédéric Lofaso

Abstract

Pressure-support ventilation is widely used during the weaning phase in patients with acute respiratory distress syndrome. The pressure-support level is adjusted to prevent ventilator-induced lung injury while limiting the patient's work of breathing. Neurally adjusted ventilatory assist is an assist mode that applies a positive pressure proportional to the integral of the electrical activity of the diaphragm. The objective was to assess the physiologic response to varying pressure-support ventilation and neurally adjusted ventilatory assist levels in selected acute respiratory distress syndrome patients and to evaluate the effect of neural triggering. We prospectively assessed 11 consecutive patients with acute respiratory distress syndrome attributable to pulmonary diseases. Pressure-support ventilation and neurally adjusted ventilatory assist were used in random order. Neurally adjusted ventilatory assist was used with a low electrical activity of the diaphragm trigger (neurally adjusted ventilatory assist-electrical activity of the diaphragm) and with a high electrical activity of the diaphragm trigger that led to rescue triggering by inspiratory flow (neurally adjusted ventilatory assist-inspiratory flow). With each ventil...Continue Reading

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