![]() ![]() Some ventilators will calibrate themselves during self check to account for circuit compliance and ‘compressible volume’ (Note: this calibration only applies during volume control ventilation and cannot be accounted for during pressure control ventilation). ![]() These circuits also have more resistance and less overall weight. These circuits have lower compliance, and thus less tidal volume is ‘lost’ to circuit expansion with pressurization. Circuits – The use of ventilators on smaller patients may require smaller circuits (check manufacturer specifications).Of note, most international standards require delivered tidal volume to be accurate to within +/- 10% of the set value. For example, if the tidal volume lower limit of a ventilator is specified to be 150mL, and you wish to deliver lung protective ventilation (6mL/kg), then the smallest patient that can be supported can way no less than 25kg (150/6=25). This limit must be referenced from the user’s manual. Tidal volume limits – The lower limit of patient size is most often determined by the lower limit of tidal volume that the ventilator can accurately deliver.Failure to account for this can result in serious harm. Manufacturers’ information must always be referenced to determine the recommended patient size as well as the necessary components required for such care. All ventilators have pre specified limits on the size of patient they can safely support. ![]()
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