Ventilator-induced lung injury such as Acute lung injury (ALI) / Acute Respiratory Distress Syndrome (ARDS) can be caused by ventilation with very large tidal volumes in normal lungs, as well as ventilation with moderate or small volumes in previously injured lungs, and research shows that the incidence of ALI increases with higher tidal volume settings in nonneurologically impaired patients. Measurement of tidal volume can be affected (usually overestimated) by leaks in the breathing circuit or the introduction of additional gas, for example during the introduction of nebulized drugs. Tidal volume is measured in milliliters and ventilation volumes are estimated based on a patient's ideal body mass. Tidal volume plays a significant role during mechanical ventilation to ensure adequate ventilation without causing trauma to the lungs. In a healthy, young human adult, tidal volume is approximately 500 ml per inspiration at rest or 7 ml/kg of body mass. Tidal volume (symbol V T or TV) is the volume of air moved into or out of the lungs in one breath. Maximal voluntary ventilation: volume of air expired in a specified period during repetitive maximal effort Peak expiratory flow: The highest forced expiratory flow measured with a peak flow meter Unless otherwise specified, volume qualifiers indicate the volume inspired from RV at the point of measurement.) For example, maximum inspiratory flow is denoted FIF max. The maximum instantaneous flow achieved during a FVC maneuverįorced inspiratory flow: (Specific measurement of the forced inspiratory curve is denoted by nomenclature analogous to that for the forced expiratory curve. Volume that has been exhaled at the end of the first second of forced expirationįorced expiratory flow related to some portion of the FVC curve modifiers refer to amount of FVC already exhaled Residual volume expressed as percent of TLCĪctual volume of the lung including the volume of the conducting airway.įorced vital capacity: the determination of the vital capacity from a maximally forced expiratory effortįorced expiratory volume (time): a generic term indicating the volume of air exhaled under forced conditions in the first t seconds

Tidal volume: that volume of air moved into or out of the lungs during quiet breathing (VT indicates a subdivision of the lung when tidal volume is precisely measured, as in gas exchange calculation, the symbol TV or V T is used.)įunctional residual capacity: the volume in the lungs at the end-expiratory position Vital capacity: the volume of air breathed out after the deepest inhalation. Inspiratory vital capacity: the maximum volume of air inhaled from the point of maximum expiration Inspiratory capacity: the sum of IRV and TV Inspiratory reserve volume: the maximal volume that can be inhaled from the end-inspiratory level Residual volume: the volume of air remaining in the lungs after a maximal exhalationĮxpiratory reserve volume: the maximal volume of air that can be exhaled from the end-expiratory position Tidal volume: that volume of air moved into or out of the lungs in 1 breath (TV indicates a subdivision of the lung when tidal volume is precisely measured, as in gas exchange calculation, the symbol TV or V T is used.) Total lung capacity: the volume in the lungs at maximal inflation, the sum of VC and RV.

JSTOR ( October 2009) ( Learn how and when to remove this message).

Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. Will do a DIY fix as you did.This article needs additional citations for verification. Overall I’m quite happy with the SMSL Dac (thanks for the recommendation) although the 3 feet wobble issue is getting on my nerves a bit. Based on now somewhat vague memories, I thought the SMSL + Nait 2 combination sounded materially better. The other Naim streaming product I have used extensively is the Superuniti. The Devialet gets lots of good reviews for its DAC and costs 15x the SMSL, so the fact that a 400 USD Dac is competitive is quite amazing. My wife who listened in thought there was no difference at all.

I can imagine others may as likely prefer the SMSL sound. To my ears I very slightly preferred the Devialet sound, although perhaps I’m more used to it. I bought the Devialet a few years ago after a very extensive demo vs a 272 /250 DR, and I thought back then that the Dac in the Devialet was better than the one in the 272, and I rate it highly.Ĭompared to the Devialet, the SMSL DAC actually sounds surprisingly similar, but probably even more clean, neutral and discolored. So effectively comparing the DAC in the Devialet vs the SMSL Su 9. I have done some comparison vs a Devialet Expert Pro 220, with Nait 2 as the amplification.

Tidal volume equation