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Respiratory Failure & Mechanical Ventilation

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Limit variable means restricting the magnitude of a variable during inspiration. A limit variable is one that can reach and maintain a preset level before inspiration ends (i.e. it does not end inspiration). Pressure, flow or volume can be limit variable but time cannot be a limit variable because limiting inspiratory time would cause inspiration to end. A limit variable does not terminate inspiration; it only sets an upper bound for pressure, flow or volume.

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