Abstract:
OBJECTIVE:This study evaluates a method for calibrating mainstream CO(2) analysers in which CO(2) partial pressure (P (CO2)) is calculated as a function of the outputs of CO(2) and O(2) analysers. METHODS:Three mass flow controllers were used to generate 25 different reference mixtures of O(2), N(2) and CO(2). Reference gas mixtures were combinations of P (CO2) = 2, 4, 6, 8, 10 kPa and O(2) partial pressure (P (O2)) = 10, 20, 40, 60, 80 kPa (balance N(2)). CO(2) and O(2) analyser data were fitted by a calibration equation which took into account the effects of oxygen partial pressure and nonlinearity of the CO(2) analyser. The calibration coefficients were tested in a separate validation data set with a variety of combinations of CO(2) and O(2). RESULTS:Our new calibration method yields a standard deviation of CO(2) measurement error that is significantly lower than a CO(2)-only calibration method in the validation data set (0.54% versus 2.72%, P < 0.05). P (CO2) measurement errors produced by the single gas calibration equation are significantly correlated with P (O2) in both the calibration (R = -0.9906, P < 0.05) and validation data sets (R = -0.9642, P < 0.05), but the errors given by our new calibration equation are independent of P (O2) (R = -0.0364, NS, and R = -0.0305, NS, for calibration and validation data sets respectively). Calibration with only CO(2) cannot eliminate the error related to the collision broadening effect of O(2), which in our CO(2) analyser is approximately a 1% underestimation of P (CO2) for every 10 kPa (75 mmHg) increase in P (O2). CONCLUSIONS:This study shows that non-dispersive infrared CO(2) analyser readings can be substantially affected by background oxygen. This effect can be corrected for by calibrating the CO(2) analyser with gases containing known proportions of both CO(2) and O(2).
journal_name
J Clin Monit Computjournal_title
Journal of clinical monitoring and computingauthors
Tang Y,Turner MJ,Baker ABdoi
10.1007/s10877-005-9005-9subject
Has Abstractpub_date
2006-04-01 00:00:00pages
75-9issue
2eissn
1387-1307issn
1573-2614journal_volume
20pub_type
杂志文章abstract:OBJECTIVE:Various studies worldwide have found that sound levels in hospitals significantly exceed the World Health Organization (WHO) guidelines, and that this noise is associated with audible signals from various medical devices. The pulse oximeter is now widely used in health care; however the health effects associa...
journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章
doi:10.1007/s10877-008-9125-0
更新日期:2008-06-01 00:00:00
abstract::While the effects of phenylephrine (PE) and ephedrine (E) on cerebral oxygen saturation (rScO2) already has been studied, the effect on paraspinal oxygen saturation (rSpsO2) is still unexplored. This study aims to assess the effect of PE and E on rScO2 and rSpsO2, measured with near-infrared spectroscopy. A randomized...
journal_title:Journal of clinical monitoring and computing
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journal_title:Journal of clinical monitoring and computing
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doi:10.1007/s10877-019-00366-0
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abstract::Univent tube (UT) and EZ-blocker were used for one-lung ventilation (OLV). UT is a single lumen tube with a small separate lumen containing a bronchial blocker. EZ-blocker differs with its unique y-shaped double-cuffed distal end. We aimed to compare these two airway devices effects on airway pressures, oxygenation, v...
journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章,随机对照试验
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更新日期:2018-04-01 00:00:00
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journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章
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更新日期:2009-04-01 00:00:00
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journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章,随机对照试验
doi:10.1007/s10877-017-0036-9
更新日期:2018-06-01 00:00:00
abstract::Extravascular lung water (EVLW) could increase by permeability pulmonary oedema, cardiogenic oedema, or both. Transthoracic echocardiography examination of a patient allows quantifying B-lines, originating from water-thickened interlobular septa, and the E/Ea ratio, related to pulmonary capillary wedge pressure. The a...
journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章
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更新日期:2015-02-01 00:00:00
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journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章
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journal_title:Journal of clinical monitoring and computing
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更新日期:2020-10-01 00:00:00
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journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章
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更新日期:2008-08-01 00:00:00
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journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章
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更新日期:2017-12-01 00:00:00
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journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章,随机对照试验
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更新日期:2014-02-01 00:00:00
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journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章
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journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章
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更新日期:2017-02-01 00:00:00
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journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章
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更新日期:2020-06-01 00:00:00
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journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章
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更新日期:2012-02-01 00:00:00
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journal_title:Journal of clinical monitoring and computing
pub_type: 社论
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journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章
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journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章
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journal_title:Journal of clinical monitoring and computing
pub_type: 信件
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更新日期:2020-07-15 00:00:00
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journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章,评审
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更新日期:2010-06-01 00:00:00
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更新日期:2015-08-01 00:00:00
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journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章
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更新日期:2010-10-01 00:00:00
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pub_type: 杂志文章
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更新日期:2013-10-01 00:00:00
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pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:2016-08-01 00:00:00
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journal_title:Journal of clinical monitoring and computing
pub_type: 杂志文章
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更新日期:2014-12-01 00:00:00
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