Ventilator settings and monitoring parameter targets for initiation of continuous mandatory ventilation: A questionnaire study☆,☆☆,★,★★


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Abstract

Purpose:To inform development of educational tools, we sought to identify initial ventilator settings and monitoring targets for 3 scenarios.Method:A survey was e-mailed to Canadian Society of Respiratory Therapists members with 2 reminders in March/April 2011.Results:Total evaluable surveys were 363. More participants selected pressure as opposed to volume ventilation for acute respiratory distress syndrome (ARDS; 77%) than for chronic obstructive pulmonary disease (COPD; 50%) and postoperative ventilation (32%; P < .001). Mean tidal volume was lower for ARDS than for COPD and postoperative ventilation (5.7, 6.9, and 7.2 mL/kg, respectively; P < .001). Maximum acceptable plateau pressures were highest for ARDS (30 cm H2O vs 29 cm H2O [COPD] and 27 cm H2O [postoperative], P < .001). Initial positive expiratory end pressure (12 cm H2O vs 7 cm H2O vs 5 cm H2O) and fraction of inspired oxygen (Fio2; 1.0 vs 0.5 vs 0.3) were also higher for ARDS (both P < .001); however, only 8% selected a positive expiratory end pressure/Fio2 combination as recommended by ARDSnet. Values of oxygen saturation as measured by pulse oximetry of 97% (ARDS) and 94% (COPD and postoperative) were considered appropriate for Fio2 reduction. The lowest pH was 7.28 vs 7.23 vs 7.26; the highest pH was 7.46 vs 7.44 vs 7.46 (P < .001). Partial pressure of carbon dioxide (arterial) of 51 mm Hg (postoperative) to 65 mm Hg (ARDS) was considered acceptable.Conclusion:Lung protective ventilation was favored, yet distinct differences in ventilator settings were evident. Monitoring targets suggested relatively conservative practices for Fio2 reduction but an understanding of permissive hypercapnia.

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