Tidal volume is the lung volume representing the normal volume of air displaced between normal inhalation and exhalation when extra effort is not applied. Typical values are around 500ml or 7ml/kg bodyweight[1].
Mechanical Ventilation
The volume of gas moved during the respiratory cycle in mechanical ventilation where control (or at least appreciation) of tidal volume is necessary to ensure adequate ventilation without causing barotrauma. Measurement can be affected (usually over-estimated) by leaks in the breathing circuit or the introduction of additional gas, for example during the introduction of nebulised drugs.
Acute Respiratory Distress Syndrome
There is evidence that limiting tidal volume to below 6ml/kg may be beneficial in the management of ARDS.
External links
References
- ^ Beardsell, I et al: MCEM Part A:MCQs, page 33, Royal Society of Medicine Press, 2009
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