The I:E ratio is the ratio of which two time periods?

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Multiple Choice

The I:E ratio is the ratio of which two time periods?

In ventilation, the I:E ratio describes how long the breath spends in inhalation compared with exhalation. It’s the inspiratory time divided by the expiratory time. This ratio shapes how long each phase lasts and, in turn, affects airway pressures and gas exchange. For example, lengthening the inspiratory time relative to expiration increases mean airway pressure and can improve oxygenation, but may slow exhalation and risk CO2 retention. Lengthening the expiratory time helps prevent air trapping, especially in obstructive conditions. The ratio is about the relative timing of the two phases, not their sum or difference.

In ventilation, the I:E ratio describes how long the breath spends in inhalation compared with exhalation. It’s the inspiratory time divided by the expiratory time. This ratio shapes how long each phase lasts and, in turn, affects airway pressures and gas exchange. For example, lengthening the inspiratory time relative to expiration increases mean airway pressure and can improve oxygenation, but may slow exhalation and risk CO2 retention. Lengthening the expiratory time helps prevent air trapping, especially in obstructive conditions. The ratio is about the relative timing of the two phases, not their sum or difference.

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